v1.8.2

This release reverts a const-correctness change introduced in v1.8.0 for the git_commit_create functions. We now retain the const-behavior for the commits arguments from prior to v1.8.0.

This change was meant to resolve compatibility issues with bindings and downstream users.

What's Changed

New features

Introduce a stricter debugging allocator for testing by @ethomson in #6811

Bug fixes

Fix constness issue introduced in #6716 by @ethomson in #6829

Build and CI improvements

README: add experimental builds to ci table by @ethomson in #6816

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.8.1...v1.8.2

v1.8.1

This release primarily includes straightforward bugfixes, as well as new functionality to have more control over the HTTP User-Agent header. However, there is an API change from v1.8 that was required for improved compatibility.

In v1.8, libgit2 introduced the report_unchanged member in the git_fetch_options structure. We mistakenly introduced this as a bitfield, which is not suitable for our public API. To correct this mistake, we have removed the report_unchanged member. To support the report unchanged tips option, users can set the update_fetchhead member to include the GIT_REMOTE_UPDATE_REPORT_UNCHANGED value.

The libgit2 projects regrets the API change, but this was required to support cross-platform compatibility.

What's Changed

New features

Allow more control over the user-agent by @ethomson in #6788

Bug fixes

commit: Fix git_commit_create_from_stage without author and committer by @florianpircher in #6781
process.c: fix environ for macOS by @barracuda156 in #6792
Bounds check for pack index read by @ConradIrwin in #6796
transport: provide a useful error message during cancellation by @ethomson in #6802
transport: support sha256 oids by @ethomson in #6803
Revparse: Correctly accept ref with '@' at the end by @csware in #6809
remote: drop bitfields in git_remote_fetch_options by @ethomson in #6806
examples: fix memory leak in for-each-ref.c by @qaqland in #6808
xdiff: use proper free function by @ethomson in #6810
rand: avoid uninitialized loadavg warnings by @ethomson in #6812
cli: include alloca on illumos / solaris / sunos by @ethomson in #6813
Update git_array allocator to obey strict aliasing rules by @ethomson in #6814
tree: avoid mixed signedness comparison by @ethomson in #6815

Build and CI improvements

ci: update nightly workflows by @ethomson in #6773
ci: give all nightly builds a unique id by @ethomson in #6782
cmake: remove workaround that isn't compatible with Windows on ARM by @hackhaslam in #6794

Documentation improvements

Docs meta-updates by @ethomson in #6787

Dependency updates

Enable llhttp for HTTP parsing by @sgallagher in #6713

New Contributors

@florianpircher made their first contribution in #6781
@barracuda156 made their first contribution in #6792
@sgallagher made their first contribution in #6713
@ConradIrwin made their first contribution in #6796
@qaqland made their first contribution in #6808

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.8.0...v1.8.1

v1.8

This is release v1.8.0, "Das Fliegende Klassenzimmer". This release includes optional, experimental support for invoking OpenSSH to fetch and push, an easier mechanism to perform the default behavior of git commit, and has many improvements for worktrees. This release also includes many other new features and bugfixes.

Major changes

Executable SSH (OpenSSH) support libgit2 can now invoke the command-line OpenSSH to fetch from and push to remotes over SSH. This support takes the place of libssh2 support. To use it, configure libgit2 with cmake -DUSE_SSH=exec, and please report any problems that you discover. By @ethomson in #6617
Simplified commit creation The git_commit_create_from_stage API was introduced to allow users to better emulate the behavior of git commit without needing to provide unnecessary information. The current state of the index is committed to the current branch. By @ethomson in #6716
Worktree improvements A number of worktree improvements have been made for better compatibility with core git. First, libgit2 now understands per-worktree references, thanks to @csware in #6387. Worktree-specific configuration is now supported, thanks to @vermiculus in #6202. And improved compatibility with git worktree add is now supported, thanks to @herrerog in #5319.

Breaking changes

Adding WORKTREE configuration level (ABI breaking change) To support worktree configurations at the appropriate level (higher priority than local configuration, but lower priority than app-specific configuration), the GIT_CONFIG_LEVEL_WORKTREE level was introduced at priority 6. GIT_CONFIG_LEVEL_APP now begins at priority 7.
Changes to git_config_entry (ABI breaking change) The git_config_entry structure now contains information about the backend_type and origin_path. The unused payload value has been removed.
git_push_options includes remote push options (ABI breaking change) The git_push_options structure now contains a value for remote push options.

Other changes

New features

config: provide an "origin" for config entries by @ethomson in #6615
cli: add a git config command by @ethomson in #6616
Add OpenSSH support by @ethomson in #6617
remote: optionally report unchanged tips by @ethomson in #6645
Support setting oid type for in-memory repositories by @kcsaul in #6671
cli: add index-pack command by @ethomson in #6681
Add git_repository_commit_parents to identify the parents of the next commit given the repository state by @ethomson in #6707
commit: introduce git_commit_create_from_stage by @ethomson in #6716
set SSH timeout by @vafada in #6721
Implement push options on push by @russell in #6439
Support index.skipHash true config by @parnic in #6738
worktree: mimic 'git worktree add' behavior. by @herrerog in #5319
Support the extension for worktree-specific config by @vermiculus in #6202
Separate config reader and writer backend priorities (for worktree configs) by @ethomson in #6756
fetch: enable deepening/shortening shallow clones by @kempniu in #6662

Bug fixes

repository: make cleanup safe for re-use with grafts by @carlosmn in #6600
fix: Add missing include for oidarray. by @dvzrv in #6608
ssh: fix known_hosts leak in _git_ssh_setup_conn by @steven9724 in #6599
proxy: Return an error for invalid proxy URLs instead of crashing by @lrm29 in #6597
errors: refactoring - never return NULL in git_error_last() by @ethomson in #6625
Reject potential option injections over ssh by @carlosmn in #6636
remote: fix memory leak in git_remote_download() by @7Ji in #6651
git2: Fix crash when called w/o parameters by @csware in #6673
Avoid macro redefinition of ENABLE_INTSAFE_SIGNED_FUNCTIONS by @csware in #6666
util: suppress some uninitialized variable warnings by @boretrk in #6659
push: set generic error in push_negotiation cb by @ethomson in #6675
process: test /usr/bin/false on BSDs by @ethomson in #6677
clone: don't mix up "http://url" with "http:/url" when figuring out if we should do a local clone by @boretrk in #6361
Several compatibility fixes by @ethomson in #6678
Git blame buffer gives the wrong result in many cases where there are by @thosey in #6572
Fix 'path cannot exist in repository' during diff for in-memory repository by @kcsaul in #6683
process: don't try to close the status by @ethomson in #6693
Minor bug fixes by @ethomson in #6695
Bypass shallow clone support for in-memory repositories by @kcsaul in #6684
examples: use unsigned int for bitfields by @ethomson in #6699
Fix some bugs caught by UBscan by @ethomson in #6700
git_diff_find_similar doesn't always remove unmodified deltas by @yori in #6642
httpclient: clear client->parser.data after use by @ethomson in #6705
Do not normalize safe.directory paths by @csware in #6668
clone: don't swallow error in should_checkout by @ethomson in #6727
Correct index add directory/file conflict detection by @ethomson in #6729
Correct git_revparse_single and add revparse fuzzing by @ethomson in #6730
config: properly delete or rename section containing multivars by @samueltardieu in #6723
revparse: ensure bare '@' is truly bare by @ethomson in #6742
repo: ensure we can initialize win32 paths by @ethomson in #6743
Swap GIT_DIFF_LINE_(ADD|DEL)_EOFNL to match other Diffs by @xphoniex in #6240
diff: fix test for SHA256 support in diff_from_buffer by @ethomson in #6745
http: support empty http.proxy config setting by @ethomson in #6744
More safe.directory improvements by @ethomson in #6739
Ensure that completely ignored diff is empty by @ethomson in #5893
Fix broken regexp that matches submodule names containing ".path" by @csware in #6749
Fix memory leaks by @csware in #6748
Make refdb_fs (hopefully) fully aware of per worktree refs by @csware in #6387
fix log example by @albfan in #6359
fetch: fail on depth for local transport by @ethomson in #6757
Fix message trailer parsing by @ethomson in #6761
config: correct fetching the HIGHEST_LEVEL config by @ethomson in #6766
Avoid some API breaking changes in v1.8 by @ethomson in #6768

Build and CI improvements

meta: update version numbers to v1.8 by @ethomson in #6596
Revert "CMake: Search for ssh2 instead of libssh2." by @ethomson in #6619
cmake: fix openssl build on win32 by @lazka in #6626
ci: retry flaky online tests by @ethomson in #6628
ci: update to macOS 12 by @ethomson in #6629
Use #!/bin/bash for script with bash-specific commands by @roehling in #6581
ci: overwrite nonsense in /usr/local during macOS setup by @ethomson in #6664
release: add a compatibility label by @ethomson in #6676
actions: set permissions by @ethomson in #6680
cmake: rename FindIconv to avoid collision with cmake by @ethomson in #6682
ci: allow workflows to read and write packages by @ethomson in #6687
ci: allow workflows to push changes by @ethomson in #6688
tests: remove test for strcasecmp by @boretrk in #6691
CI fixes by @ethomson in #6694
ci: improvements to prepare for Cygwin support by @ethomson in #6696
Yet more CI improvements by @ethomson in #6697
Fix nightly builds by @ethomson in #6709
Benchmarks: add a site to view results by @ethomson in #6715
GIT_RAND_GETENTROPY: do not include sys/random.h by @semarie in #6736
add dl to LIBGIT2_SYSTEM_LIBS by @christopherfujino in #6631
meta: add dependency tag to release.yml by @ethomson in #6740
CI: fix our nightlies by @ethomson in #6751
trace: Re-enable tests as tracing is now enabled by default by @lrm29 in #6752
tests: don't free an unininitialized repo by @ethomson in #6763
ci: reduce ASLR randomization for TSAN by @ethomson in #6764
packbuilder: adjust nondeterministic tests by @ethomson in #6762
Allow libgit2 to be compiled with mbedtls3. by @adamharrison in #6759
build: update to latest actions versions by @ethomson in #6765
ctype: cast characters to unsigned when classifying characters by @boretrk in #6679 and @ethomson in #6770
valgrind: suppress OpenSSL warnings by @ethomson in #6769

Documentation improvements

README.md: Fix link to conan packages by @lrm29 in #6621
README: replace gmaster with GitButler by @ethomson in #6692
blame example: Fix support for line range in CLI by @wetneb in #6638
Support authentication in push example by @pluehne in #5904
docs: fix mistake in attr.h by @DavHau in #6714
Fix broken links by @csware in #6747

Platform compatibility fixes

stransport: macOS: replace errSSLNetworkTimeout, with hard-coded value by @mascguy in #6610

Git compatibility fixes

Do not trim dots from usernames by @georgthegreat in #6657
merge: fix incorrect rename detection for empty files by @herrerog in #6717

Dependency updates

zlib: upgrade bundled zlib to v1.3 by @ethomson in #6698
ntlmclient: update to latest upstream ntlmclient by @ethomson in #6704

New Contributors

@dvzrv made their first contribution in #6608
@mascguy made their first contribution in #6610
@steven9724 made their first contribution in #6599
@lazka made their first contribution in #6626
@roehling made their first contribution in #6581
@7Ji made their first contribution in #6651
@kempniu made their first contribution in #6662
@thosey made their first contribution in #6572
@wetneb made their first contribution in #6638
@yori made their first contribution in #6642
@pluehne made their first contribution in #5904
@DavHau made their first contribution in #6714
@vafada made their first contribution in #6721
@semarie made their first contribution in #6736
@christopherfujino made their first contribution in #6631
@parnic made their first contribution in #6738
@samueltardieu made their first contribution in #6723
@xphoniex made their first contribution in #6240
@adamharrison made their first contribution in #6759

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.7.0...v1.8.0

v1.7

This is release v1.7.0, "Kleine Raupe Nimmersatt". This release adds shallow clone support, completes the experimental SHA256 support, adds Schannel support for Windows, and includes many other new features and bugfixes.

Major changes

Shallow clone support libgit2 now supports shallow clone and shallow repositories, thanks to a significant investment from many community members -- hundreds of commits by many contributors.
- Shallow (#6396) with some fixes from review by @ethomson in #6557
- Shallow Clone Support by @lya001 in #6396
- Shallow support v2 by @pks-t in #5254
SHA256 support libgit2 should now support SHA256 repositories using the extensions.objectFormat configuration option when the library is built with EXPERIMENTAL_SHA256=ON. Users are encouraged to begin testing their applications with this option and provide bug reports and feedback. This is a breaking API change; SHA256 support will be enabled by default in libgit2 v2.0.
- sha256: less hardcoded SHA1 types and lengths by @ethomson in #6549
- Support SHA256 in git_repository_wrap_odb by @ethomson in #6556
Schannel and SSPI for Windows libgit2 now supports the Windows Schannel and SSPI APIs for HTTPS support on Windows, when configured with USE_HTTPS=Schannel. Setting this option will not use the existing WinHTTP support, but will use libgit2's standard HTTP client stack with Windows TLS primitives. Windows users are encouraged to begin testing their applications with this option and provide bug reports and feedback. This will be enabled by default in a future version of libgit2.
- Introduce Schannel and SSPI for Windows by @ethomson in #6533

Breaking changes

Simplify custom pluggable allocator (System API / ABI breaking change) The git_allocator structure (configurable by the GIT_OPT_SET_ALLOCATOR option) now only contains gmalloc, grealloc and gfree members. This simplifies both the work needed by an implementer and allows more flexibility and correctness in libgit2 itself, especially during out-of-memory situations and errors during bootstrapping.
- tests: add allocator with limited number of bytes by @ethomson in #6563

Other changes

New features

repo: honor environment variables for more scenarios by @ethomson in #6544
Introduce timeouts on sockets by @ethomson in #6535

Performance improvements

midx: do not try to look at every object in the index by @carlosmn in #6585
Partial fix for #6532: insert-by-date order. by @arroz in #6539

Bug fixes

repo: don't allow repeated extensions by @ethomson in #6505
config: return GIT_ENOTFOUND for missing programdata by @ethomson in #6547
Fix missing oid type for "fake" repositories by @oreiche in #6554
Thread-local storage: handle failure cases by @ethomson in #5722
midx: allow unknown chunk ids in multi-pack index files by @carlosmn in #6583
pack: cast the number of objects to size_t by @carlosmn in #6584
Fixes #6344: git_branch_move now renames the reflog instead of deleting by @arroz in #6345
#6576 git_diff_index_to_workdir reverse now loads untracked content by @arroz in #6577

Build and CI improvements

meta: the main branch is now v1.7.0 by @ethomson in #6516
xdiff: move xdiff to 'deps' by @ethomson in #6482
util: detect all possible qsort_r and qsort_s variants by @DimitryAndric in #6555
Work around -Werror problems when detecting qsort variants by @DimitryAndric in #6558
actions: simplify execution with composite action by @ethomson in #6488
CMake: Search for ssh2 instead of libssh2. by @Faless in #6586

Documentation improvements

docs: fix IRC server from freenode to libera by @vincenzopalazzo in #6590

Dependency upgrades

Update xdiff to git 2.40.1's version by @ethomson in #6561
deps: update pcre to 8.45 by @ethomson in #6593

New Contributors

@oreiche made their first contribution in #6554
@DimitryAndric made their first contribution in #6555
@vincenzopalazzo made their first contribution in #6590
@Faless made their first contribution in #6586

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.6.3...v1.7.0

v1.6.3

What's Changed

Bug fixes

odb: restore git_odb_open by @ethomson in #6520
Ensure that git_index_add_all handles ignored directories by @ethomson in #6521
pack: use 64 bits for the number of objects by @carlosmn in #6530

Build and CI improvements

Remove unused wditer variable by @georgthegreat in #6518
fs_path: let root run the ownership tests by @ethomson in #6513
sysdir: Do not declare win32 functions on non-win32 platforms by @Batchyx in #6527
cmake: don't include include/git2 by @ethomson in #6529

New Contributors

@georgthegreat made their first contribution in #6518

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.6.2...v1.6.3

v1.6.2

What's Changed

Bug fixes

remote: always populate old id in update tips by @ethomson in #6506 The update tips callback would not always be properly provided with an empty (0000000...) OID for new refs.
Revert #6503 by @ethomson in #6511 The certificate callback added port information for callbacks in #6503, but the format was ambiguous with IPv6 addresses. Revert this change temporarily.
Add git_odb_backend_loose back by @ethomson in #6512 During SHA256 refactoring, the git_odb_backend_loose API was accidentally removed. Add it back.
meta: configure pkg-config .pc correctly by @ethomson in #6514 During SHA256 refactoring, the pkg-config .pc file was erroneously renamed to git2 instead of libgit2. Repair this.

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.6.1...v1.6.2

v1.6

This is release v1.6.1, "Hubbeliges Krokodil". This release adds experimental SHA256 support and includes many new features and bugfixes. This release replaces libgit2 v1.6.0, which did not correctly update its version number(s).

What's Changed

New features

Support for bare repositories with SHA256 support (experimental) by @ethomson in #6191 You can configure experimental SHA256 support in libgit2 with cmake -DEXPERIMENTAL_SHA256=ON during project setup. This is useful for considering future integrations, work on clients, and work on language bindings. At present, working with bare repositories should largely work, including remote operations. But many pieces of functionality - including working with the index - are not yet supported. As a result, libgit2 with SHA256 support should not be used in production or released with package distribution.
Support the notion of a home directory separately from global configuration directory by @ethomson in #6455 and #6456 Callers and language bindings can now configure the home directory that libgit2 uses for file lookups (eg, the .ssh directory). This configuration is separate from the git global configuration path.
stash: partial stash specific files by @gitkraken-jacobw in #6330 A stash can be created with only specific files, using a pathspec. This is similar to the git stash push command.
push: revparse refspec source, so you can push things that are not refs by @sven-of-cord in #6362 Pushes can be performed using refspecs instead of only references.
Support OpenSSL3 by @ethomson in #6464 and #6471 OpenSSL 3 is now supported, both when compiled directly and dynamically loaded.

Bug fixes

winhttp: support long custom headers by @kcsaul in #6363
Fix memory leak by @csware in #6382
Don't fail the whole clone if you can't find a default branch by @torvalds in #6369
#6366: When a worktree is missing, return GIT_ENOTFOUND. by @arroz in #6395
commit-graph: only verify csum on git_commit_graph_open(). by @derrickstolee in #6420
Ignore missing 'safe.directory' config during ownership checks by @kcsaul in #6408
Fix leak in git_tag_create_from_buffer by @julianmesa-gitkraken in #6421
http: Update httpclient options when reusing an existing connection. by @slackner in #6416
Add support for safe.directory * by @csware in #6429
URL parsing for google-compatible URLs by @ethomson in #6326
Fixes #6433: git_submodule_update fails to update configured but missing submodule by @tagesuhu in #6434
transport: fix capabilities calculation by @russell in #6435
push: use resolved oid as the source by @ethomson in #6452
Use git_clone__submodule to avoid file checks in workdir by @abizjak in #6444
#6422: handle dangling symbolic refs gracefully by @arroz in #6423
diff_file: Fix crash when freeing a patch representing an empty untracked file by @jorio in #6475
clone: clean up options on failure by @ethomson in #6479
stash: update strarray usage by @ethomson in #6487
#6491: Sets oid_type on repos open with git_repository_open_bare by @arroz in #6492
Handle Win32 shares by @ethomson in #6493
Make failure to connect to ssh-agent non-fatal by @fxcoudert in #6497
odb: don't unconditionally add oid_type to stream by @ethomson in #6499
Pass hostkey & port to host verify callback by @fxcoudert in #6503

Code cleanups

meta: update version number to v1.6.0-alpha by @ethomson in #6352
sha256: indirection for experimental functions by @ethomson in #6354
Delete create.c.bak by @lrm29 in #6398
Support non-cmake builds with an in-tree experimental.h by @ethomson in #6405

Build and CI improvements

tests: skip flaky-ass googlesource tests by @ethomson in #6353
clar: remove ftrunacte from libgit2 tests by @boretrk in #6357
CI Improvements by @ethomson in #6403
fix compile on Windows with -DWIN32_LEAN_AND_MEAN by @christoph-cullmann in #6373
Fixes #6365 : Uppercase windows.h include fails build in case-sensitive OS by @Vinz2008 in #6377
ci: update version numbers of actions by @ethomson in #6448
thread: avoid warnings when building without threads by @ethomson in #6432
src: hide unused hmac() prototype by @0-wiz-0 in #6458
tests: update clar test runner by @ethomson in #6459
ci: always create test summaries, even on failure by @ethomson in #6460
Fix build failure with -DEMBED_SSH_PATH by @vicr123 in #6374
Define correct off64_t for AIX by @bzEq in #6376
Fix some warnings in main by @ethomson in #6480
strarray: remove deprecated declaration by @ethomson in #6486
tests: always unset HTTP_PROXY before starting tests by @ethomson in #6498

Documentation improvements

add 2-clause BSD license to COPYING by @martinvonz in #6413
Add new PHP bindings project to language bindings section of README.md by @RogerGee in #6473
README: clarify the linking exception by @ethomson in #6494
Correct the definition of "empty" in the docs for git_repository_is_empty by @timrogers in #6500

New Contributors

@christoph-cullmann made their first contribution in #6373
@Vinz2008 made their first contribution in #6377
@torvalds made their first contribution in #6369
@derrickstolee made their first contribution in #6420
@julianmesa-gitkraken made their first contribution in #6421
@slackner made their first contribution in #6416
@martinvonz made their first contribution in #6413
@tagesuhu made their first contribution in #6434
@russell made their first contribution in #6435
@sven-of-cord made their first contribution in #6362
@0-wiz-0 made their first contribution in #6458
@abizjak made their first contribution in #6444
@vicr123 made their first contribution in #6374
@bzEq made their first contribution in #6376
@gitkraken-jacobw made their first contribution in #6330
@fxcoudert made their first contribution in #6497
@timrogers made their first contribution in #6500

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.5.0...v1.6.0

v1.5

This is release v1.5.0, "Stubentiger". This release adds the basis for an experimental CLI, continues preparing for SHA256 support, adds a benchmarking utility, and has numerous new features and bugfixes.

What's Changed

New features

The beginnings of a git-compatible CLI for testing and benchmarking by @ethomson in #6133
Add clone support to the CLI @ethomson in #6274
A benchmarking suite to compare libgit2 functionality against git by @ethomson in #6235
SHA256: add a SHA256 implementation backend by @ethomson in #6144
SHA256: support dynamically loaded openssl by @ethomson in #6258
Transport: introduce git_transport_smart_remote_connect_options by @lhchavez in #6278

Bug fixes

Free parent and ref in lg2_commit before returning. by @apnadkarni in #6219
xdiff: use xdl_free not free by @ethomson in #6223
remote: do store the update_tips callback error value by @carlosmn in #6226
win32: find_system_dirs does not return GIT_ENOTFOUND by @ethomson in #6228
Some minor fixes for issues discovered by coverity by @ethomson in #6238
Fix a string concatenation bug when validating extensions by @bierbaum in #6246
fetch: support OID refspec without dst by @ethomson in #6251
Fix crash when regenerating a patch with unquoted spaces in filename by @jorio in #6244
midx: Fix an undefined behavior (left-shift signed overflow) by @lhchavez in #6260
Validate repository directory ownership by @ethomson in #6266
midx: fix large offset table check. by @ccstolley in #6309
midx: do not verify the checksum on load by @carlosmn in #6291
revparse: Remove error-prone, redundant test by @dongcarl in #6299
refs: fix missing error message by @zawata in #6305
CLI: progress updates by @ethomson in #6319
A couple of simplications around mwindow by @carlosmn in #6288
config: update config entry iteration lifecycle by @ethomson in #6320
repo: allow administrator to own the configuration by @ethomson in #6321
filter: Fix Segfault by @zawata in #6303
ntlmclient: LibreSSL 3.5 removed HMAC_CTX_cleanup by @vishwin in #6340
Fix internal git_sysdir_find* function usage within public git_config_find* functions by @kcsaul in #6335
fix interactive rebase detect. by @i-tengfei in #6334
cmake: drop posix dependency from pcre* detection by @jpalus in #6333
Fix erroneously lax configuration ownership checks by @ethomson in #6341
pack: don't pretend we support pack files v3 by @ethomson in #6347
Fix creation of branches and tags with invalid names by @lya001 in #6348

Security fixes

Fixes for CVE 2022-29187 by @ethomson in #6349
zlib: update bundled zlib to v1.2.12 by @ethomson in #6350

Code cleanups

sha256: refactoring in preparation for sha256 by @ethomson in #6265
remote: Delete a now-inexistent API declaration by @lhchavez in #6276
Fix missing include by @cschlack in #6277

Build and CI improvements

meta: show build status for v1.3 and v1.4 branches by @ethomson in #6216
cmake: Fix package name for system http-parser by @mgorny in #6217
meta: update version number to v1.5.0-alpha by @ethomson in #6220
cmake: export libraries needed to compile against libgit2 by @ethomson in #6239
clone: update bitbucket tests by @ethomson in #6252
diff: don't stat empty file on arm32 (flaky test) by @ethomson in #6259
tests: support flaky stat by @ethomson in #6262
Include test results data in CI by @ethomson in #6306
Add a .clang-format with our style by @ethomson in #6023
CI: limits actions scheduled workflows to the main repo by @ethomson in #6342
ci: update dockerfiles for mbedTLS new url by @ethomson in #6343

Documentation improvements

Add Pharo to language bindings by @theseion in #6310
Add link to Tcl bindings for libgit2 by @apnadkarni in #6318
fix couple of typos by @SkinnyMind in #6287
update documentation for default status options by @ethomson in #6322

New Contributors

@bierbaum made their first contribution in #6246
@dongcarl made their first contribution in #6299
@SkinnyMind made their first contribution in #6287
@zawata made their first contribution in #6305
@vishwin made their first contribution in #6340
@i-tengfei made their first contribution in #6334
@jpalus made their first contribution in #6333
@lya001 made their first contribution in #6348

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.4.0...v1.5.0

v1.4

This is release v1.4.0, "Fisematenten". This release includes several new features and bugfixes, improves compatibility with git, and begins preparation for SHA256 support in a future release.

What's Changed

New features

diff: update rename limit to 1000 to match git's behavior by @ethomson in #6092
odb: support checking for object existence without refresh by @joshtriplett in #6107
object: provide a low-level mechanism to validate whether a raw object is valid (git_object_rawcontent_is_valid) by @ethomson in #6128
blob: provide a function to identify binary content by @ethomson in #6142
status: add rename_threshold to git_status_options. by @arroz in #6158
remote: support http.followRedirects (false and initial) and follow initial redirects by default by @ethomson in #6175
remote: support scp style paths with ports ([git@github.com:22]:libgit2/libgit2) by @ethomson in #6167
win32: update git for windows configuration file location compatibility by @csware in #6151 and @ethomson in #6180
refs: speed up packed reference lookups when packed refs are sorted by @ccstolley in #6138
merge: support zdiff3 conflict styles by @ethomson in #6195
remote: support fetching by object id (using "+oid:ref" refspec syntax) by @ethomson in #6203
merge: callers can specify virtual-base building behavior and to optionally accept conflict markers as a resolution by @boretrk in #6204

Bug fixes

Fix a gcc 11 warning in src/threadstate.c by @lhchavez in #6115
Fix a gcc 11 warning in src/thread.h by @lhchavez in #6116
cmake: re-enable WinHTTP by @ethomson in #6120
Fix repo init when template dir is non-existent by @ammgws in #6106
cmake: use project-specific root variable instead of CMAKE_SOURCE_DIR by @Qix- in #6146
Better revparse compatibility for at time notation by @yoichi in #6095
remotes: fix insteadOf/pushInsteadOf handling by @mkhl in #6101
git_commit_summary: ignore lines with spaces by @stforek in #6125
Config parsing by @csware in #6124
config: handle empty conditional in includeIf by @ethomson in #6165
#6154 git_status_list_new case insensitive fix by @arroz in #6159
futils_mktmp: don't use umask by @boretrk in #6178
revparse: support bare '@' by @ethomson in #6196
odb: check for write failures by @ethomson in #6206
push: Prepare pack before sending pack header. by @ccstolley in #6205
mktmp: improve our temp file creation by @ethomson in #6207
diff_file: fix crash if size of diffed file changes in workdir by @jorio in #6208
merge: comment conflicts lines in MERGE_MSG by @ethomson in #6197
Fix crashes in example programs on Windows (sprintf_s not compatible with snprintf) by @apnadkarni in #6212

Code cleanups

Introduce git_remote_connect_options by @ethomson in #6161
hash: separate hashes and git_oid by @ethomson in #6082
git_buf: now a public-only API (git_str is our internal API) by @ethomson in #6078
cmake: cleanups and consistency by @ethomson in #6084
path: refactor utility path functions by @ethomson in #6104
str: git_str_free is never a function by @ethomson in #6111
cmake refactorings by @ethomson in #6112
Add missing-declarations warning globally by @ethomson in #6113
cmake: further refactorings by @ethomson in #6114
tag: set validity to 0 by default by @ethomson in #6119
util: minor cleanup and refactoring to the date class by @ethomson in #6121
Minor code cleanups by @ethomson in #6122
Fix a long long that crept past by @NattyNarwhal in #6094
remote: refactor insteadof application by @ethomson in #6147
ntmlclient: fix linking with libressl by @boretrk in #6157
c99: change single bit flags to unsigned by @boretrk in #6179
Fix typos by @rex4539 in #6164
diff_driver: split global_drivers array into separate elements by @boretrk in #6184
cmake: disable some gnu extensions by @boretrk in #6185
Disabling setting CMAKE_FIND_LIBRARY_SUFFIXES on Apple platforms. by @arroz in #6153
C90: add inline macro to xdiff and mbedtls by @boretrk in #6200
SHA256: early preparation by @ethomson in #6192

CI improvements

tests: rename test runner to libgit2_tests, build option to BUILD_TESTS. by @ethomson in #6083
ci: only update docs on push by @ethomson in #6108
Pedantic header test by @boretrk in #6086
ci: build with ssh on nightly by @ethomson in #6148
ci: improve the name in CI runs by @ethomson in #6198

Documentation improvements

Document that git_odb is thread-safe by @joshtriplett in #6109
Improve documentation by @punkymaniac in #6168

Other changes

libgit2_clar is now libgit2_tests by @mkhl in #6100
Remove PSGit from Language Bindings section of README by @cestrand in #6150
COPYING: remove regex copyright, add PCRE copyright by @ethomson in #6187
meta: add a release configuration file by @ethomson in #6211

New Contributors

@mkhl made their first contribution in #6100
@ammgws made their first contribution in #6106
@yoichi made their first contribution in #6095
@stforek made their first contribution in #6125
@cestrand made their first contribution in #6150
@rex4539 made their first contribution in #6164
@jorio made their first contribution in #6208

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.3.0...v1.4.0

v1.3

This is release v1.3.0, "Zugunruhe". This release includes only minor new features that will be helpful for users to have an orderly transition to the v2.0 lineage.

New Features

Support custom git extensions by @ethomson in #6031
Introduce git_email_create; deprecate git_diff_format_email by @ethomson in #6061

Deprecated APIs

git_oidarray_free is deprecated; callers should use git_oidarray_dispose

Bug fixes

#6028: Check if threadstate->error_t.message is not git_buf__initbuf before freeing. by @arroz in #6029
remote: Mark git_remote_name_is_valid as GIT_EXTERN by @lhchavez in #6032
Fix config parsing for multiline with multiple quoted comment chars by @basile-henry in #6043
indexer: Avoid one mmap(2)/munmap(2) pair per git_indexer_append call by @lhchavez in #6039
merge: Check file mode when resolving renames by @ccstolley in #6060
Allow proxy options when connecting with a detached remote. by @lrm29 in #6058
win32: allow empty environment variables by @ethomson in #6063
Fixes for deprecated APIs by @ethomson in #6066
filter: use a git_oid in filter options, not a pointer by @ethomson in #6067
diff: update GIT_DIFF_IGNORE_BLANK_LINES by @ethomson in #6068
Attribute lookups are always on relative paths by @ethomson in #6073
Handle long paths when querying attributes by @ethomson in #6075

Code cleanups

notes: use a buffer internally by @ethomson in #6047
Fix coding style for pointer by @punkymaniac in #6045
Use typeof GNUC keyword for ISO C compatibility by @duncanthomson in #6041
Discover libssh2 without pkg-config by @stac47 in #6053
Longpath filter bug by @lrm29 in #6055
Add test to ensure empty proxy env behaves like unset env by @sathieu in #6052
Stdint header condition has been reverted. by @lolgear in #6020
buf: common_prefix takes a string array by @ethomson in #6077
oidarray: introduce git_oidarray_dispose by @ethomson in #6076
examples: Free the git_config and git_config_entry after use by @257 in #6071

CI Improvements

ci: pull libssh2 from www.libssh2.org by @ethomson in #6064

Documentation changes

Update README.md by @shijinglu in #6050

New Contributors

@basile-henry made their first contribution in #6043
@duncanthomson made their first contribution in #6041
@stac47 made their first contribution in #6053
@shijinglu made their first contribution in #6050
@ccstolley made their first contribution in #6060
@sathieu made their first contribution in #6052
@257 made their first contribution in #6071

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.2.0...v1.3.0

v1.2

This is release v1.2.0, "Absacker". This release includes many new features: in particular, support for commit graphs, multi-pack indexes, and core.longpaths support.

This is meant to be the final minor release in the v1 lineage. v2.0 will be the next major release and will remove deprecated APIs and may include breaking changes.

Deprecated APIs

revspec: rename git_revparse_mode_t to git_revspec_t by @ethomson in #5786
tree: deprecate git_treebuilder_write_with_buffer by @ethomson in #5815
Deprecate is_valid_name functions; replace with name_is_valid functions by @ethomson in #5659
filter: stop taking git_buf as user input by @ethomson in #5859
remote: introduce remote_ready_cb, deprecate resolve_url callback by @ethomson in #6012
Introduce create_commit_cb, deprecate signing_cb by @ethomson in #6016
filter: filter drivers stop taking git_buf as user input by @ethomson in #6011
buf: deprecate public git_buf writing functions by @ethomson in #6017

New features

winhttp: support optional client cert by @ianhattendorf in #5384
Add support for additional SSH hostkey types. by @arroz in #5750
Handle ipv6 addresses by @ethomson in #5741
zlib: Add support for building with Chromium's zlib implementation by @lhchavez in #5748
commit-graph: Introduce a parser for commit-graph files by @lhchavez in #5762
patch: add owner accessor by @KOLANICH in #5731
commit-graph: Support lookups of entries in a commit-graph by @lhchavez in #5763
commit-graph: Introduce git_commit_graph_needs_refresh() by @lhchavez in #5764
Working directory path validation by @ethomson in #5823
Support core.longpaths on Windows by @ethomson in #5857
git_reference_create_matching: Treat all-zero OID as "must be absent" by @novalis in #5842
diff:add option to ignore blank line changes by @yuuri in #5853
[Submodule] Git submodule dup by @lolgear in #5890
commit-graph: Use the commit-graph in revwalks by @lhchavez in #5765
commit-graph: Introduce git_commit_list_generation_cmp by @lhchavez in #5766
graph: Create git_graph_reachable_from_any() by @lhchavez in #5767
Support reading attributes from a specific commit by @ethomson in #5952
[Branch] Branch upstream with format by @lolgear in #5861
Dynamically load OpenSSL (optionally) by @ethomson in #5974
Set refs/remotes/origin/HEAD to default branch when branch is specified by @A-Ovchinnikov-mx in #6010
midx: Add a way to write multi-pack-index files by @lhchavez in #5404
Use error code GIT_EAUTH for authentication failures by @josharian in #5395
midx: Introduce git_odb_write_multi_pack_index() by @lhchavez in #5405
Checkout dry-run by @J0Nes90 in #5841
mbedTLS: Fix setting certificate directory by @mikezackles in #6004
remote: introduce remote_ready_cb, deprecate resolve_url callback by @ethomson in #6012
Introduce create_commit_cb, deprecate signing_cb by @ethomson in #6016
commit-graph: Add a way to write commit-graph files by @lhchavez in #5778

Bug fixes

Define git___load when building with -DTHREADSAFE=OFF by @lhchavez in #5664
Make the Windows leak detection more robust by @lhchavez in #5661
Refactor "global" state by @ethomson in #5546
threadstate: rename tlsdata when building w/o threads by @ethomson in #5668
Include ${MBEDTLS_INCLUDE_DIR} when compiling crypt_mbedtls.c by @staticfloat in #5685
Fix the -DTHREADSAFE=OFF build by @lhchavez in #5690
Add missing worktree_dir check and test case by @rbmclean in #5692
msvc crtdbg -> win32 leakcheck by @ethomson in #5580
Introduce GIT_ASSERT macros by @ethomson in #5327
Also add the raw hostkey to git_cert_hostkey by @lhchavez in #5704
Make the odb race-free by @lhchavez in #5595
Make the pack and mwindow implementations data-race-free by @lhchavez in #5593
Thread-free implementation by @ethomson in #5719
Thread-local storage: a generic internal library (with no allocations) by @ethomson in #5720
Friendlier getting started in the lack of git_libgit2_init by @ethomson in #5578
Make git__strntol64() ~70%* faster by @lhchavez in #5735
Cache the parsed submodule config when diffing by @lhchavez in #5727
pack: continue zlib while we can make progress by @ethomson in #5740
Avoid using __builtin_mul_overflow with the clang+32-bit combo by @lhchavez in #5742
repository: use intptr_t's in the config map cache by @ethomson in #5746
Build with NO_MMAP by @0xdky in #5583
Add documentation for git_blob_filter_options.version by @JoshuaS3 in #5759
blob: fix name of GIT_BLOB_FILTER_ATTRIBUTES_FROM_HEAD by @ethomson in #5760
Cope with empty default branch by @ethomson in #5770
README: instructions for using libgit2 without compiling by @ethomson in #5772
Use p_pwrite/p_pread consistently throughout the codebase by @lhchavez in #5769
midx: Fix a bug in git_midx_needs_refresh() by @lhchavez in #5768
mwindow: Fix a bug in the LRU window finding code by @lhchavez in #5783
refdb_fs: Check git_sortedcache wlock/rlock errors by @mamapanda in #5800
index: Check git_vector_dup error in write_entries by @mamapanda in #5801
Fix documentation formating on repository.h by @punkymaniac in #5806
include: fix typos in comments by @tniessen in #5805
Fix some typos by @aaronfranke in #5797
Check git_signature_dup failure by @mamapanda in #5817
merge: Check insert_head_ids error in create_virtual_base by @mamapanda in #5818
winhttp: skip certificate check if unable to send request by @ianhattendorf in #5814
Default to GIT_BRANCH_DEFAULT if init.defaultBranch is empty string by @ianhattendorf in #5832
Fix diff_entrycount -> diff_num_deltas doc typo by @mjsir911 in #5838
repo: specify init.defaultbranch is meant to be a branch name by @carlosmn in #5835
repo: remove an inappropriate use of PASSTHROUGH by @carlosmn in #5834
src: fix typos in header files by @tniessen in #5843
test: clean up memory leaks by @ethomson in #5858
buf: remove unnecessary buf_text namespace by @ethomson in #5860
Fix bug in git_diff_find_similar. by @staktrace in #5839
Fix issues with Proxy Authentication after httpclient refactor by @implausible in #5852
tests: clean up memory leak, fail on leak for win32 by @ethomson in #5892
Tolerate readlink size less than st_size by @dtolnay in #5900
Define WINHTTP_NO_CLIENT_CERT_CONTEXT if needed by @jacquesg in #5929
Update from regex to pcre licensing information in docs/contributing.md by @boretrk in #5916
Consider files executable only if the user can execute them by @novalis in #5915
git__timer: Limit ITimer usage to AmigaOS4 by @boretrk in #5936
Fix memory leak in git_smart__connect by @punkymaniac in #5908
config: fix included configs not refreshed more than once by @Batchyx in #5926
Fix wrong time_t used in function by @NattyNarwhal in #5938
fix check for ignoring of negate rules by @palmin in #5824
Make FIND_PACKAGE(PythonInterp) prefer python3 by @lhchavez in #5913
git__timer: Allow compilation on systems without CLOCK_MONOTONIC by @boretrk in #5945
stdintification: use int64_t and INT64_C instead of long long by @NattyNarwhal in #5941
Optional stricter allocation checking (for malloc(0) cases) by @ethomson in #5951
Variadic arguments aren't in C89 by @NattyNarwhal in #5948
Fix typo in general.c by @Crayon2000 in #5954
common.h: use inline when compiling for C99 and later by @boretrk in #5953
Fix one memory leak in master by @lhchavez in #5957
tests: reset odb backend priority by @ethomson in #5961
cmake: extended futimens checking on macOS by @ethomson in #5962
amiga: use ';' as path list separator on AmigaOS by @boretrk in #5978
Respect the force flag on refspecs in git_remote_fetch by @alexjg in #5854
Fix LIBGIT2_FILENAME not being passed to the resource compiler by @jairbubbles in #5994
sha1dc: remove conditional for <sys/types.h> by @boretrk in #5997
openssl: don't fail when we can't customize allocators by @ethomson in #5999
C11 warnings by @boretrk in #6005
open: input validation for empty segments in path by @boretrk in #5950
Introduce GIT_WARN_UNUSED_RESULT by @lhchavez in #5802
GCC C11 warnings by @boretrk in #6006
array: check dereference from void * type by @boretrk in #6007
Homogenize semantics for atomic-related functions by @lhchavez in #5747
git_array_alloc: return objects of correct type by @boretrk in #6008
CMake. hash sha1 header has been added. by @lolgear in #6013
tests: change comments to c89 style by @boretrk in #6015
Set Host Header to match CONNECT authority target by @lollipopman in #6022
Fix worktree iteration when repository has no common directory by @kcsaul in #5943

Documentation improvements

Update README.md for additional Delphi bindings by @todaysoftware in #5831
Fix documentation formatting by @punkymaniac in #5850
docs: fix incorrect comment marker by @tiennou in #5897
Patch documentation by @punkymaniac in #5903
Fix misleading doc for git_index_find by @arxanas in #5910
docs: stop mentioning libgit2's "master" branch by @Batchyx in #5925
docs: fix some missing includes that cause Docurium to error out by @tiennou in #5917
Patch documentation by @punkymaniac in #5940

Development improvements

WIP: .devcontainer: settings for a codespace workflow by @ethomson in #5508

CI Improvements

Add a ThreadSanitizer build by @lhchavez in #5597
ci: more GitHub Actions by @ethomson in #5706
ci: run coverity in the nightly builds by @ethomson in #5707
ci: only report main branch in README status by @ethomson in #5708
Fix the ENABLE_WERROR=ON build in Groovy Gorilla (gcc 10.2) by @lhchavez in #5715
Re-enable the RC4 test by @carlosmn in #4418
ci: run codeql by @ethomson in #5709
github-actions: Also rename the main branch here by @lhchavez in #5771
ci: don't use ninja on macOS by @ethomson in #5780
ci: use GitHub for storing mingw-w64 build dependency by @ethomson in #5855
docker: remove the entrypoint by @ethomson in #5980
http: don't require a password by @ethomson in #5972
ci: update nightly to use source path by @ethomson in #5989
ci: add centos 7 and centos 8 by @ethomson in #5992
ci: update centos builds by @ethomson in #5995
ci: tag new containers with the latest tag by @ethomson in #6000

Dependency updates

ntlm: ntlmclient is now v0.9.1

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.1.0...v1.2.0

v1.1

This is release v1.1, "Fernweh".

Changes or improvements

Our bundled PCRE dependency has been updated to 8.44.
The refs/remotes/origin/HEAD file will be created at clone time to point to the origin's default branch.
libgit2 now uses the __atomic_ intrinsics instead of __sync_ intrinsics on supported gcc and clang versions.
The init.defaultBranch setting is now respected and master is no longer the hardcoded as the default branch name.
Patch files that do not contain an index line can now be parsed.
Configuration files with multi-line values can now contain quotes split across multiple lines.
Windows clients now attempt to use TLS1.3 when available.
Servers that request an upgrade to a newer HTTP version are silently ignored instead of erroneously failing.
Users can pass NULL to the options argument to git_describe_commit.
Clones and fetches of very large packfiles now succeeds on 32-bit platforms.
Custom reference database backends can now handle the repository's HEAD correctly.
Repositories with a large number of packfiles no longer exhaust the number of file descriptors.
The test framework now supports TAP output when the -t flag is specified.
The test framework can now specify an exact match to a test function using a trailing $.
All checkout types support GIT_CHECKOUT_DISABLE_PATHSPEC_MATCH.
git_blame now can ignore whitespace changes using the option GIT_BLAME_IGNORE_WHITESPACE.
Several new examples have been created, including an examples for commit, add and push.
Mode changes during rename are now supported in patch application.
git_checkout_head now correctly removes untracked files in a subdirectory when the FORCE | REMOVE_UNTRACKED options are specified.

v1.0.1

This is a bugfix release with the following changes:

Calculating information about renamed files during merges is more efficient because dissimilarity about files is now being cached and no longer needs to be recomputed.
The git_worktree_prune_init_options has been correctly restored for backward compatibility. In v1.0 it was incorrectly deprecated with a typo.
The optional ntlmclient dependency now supports NetBSD.
A bug where attempting to stash on a bare repository may have failed has been fixed.
Configuration files that are unreadable due to permissions are now silently ignored, and treated as if they do not exist. This matches git's behavior; previously this case would have been an error.
v4 index files are now correctly written; previously we would read them correctly but would not write the prefix-compression accurately, causing corruption.
A bug where the smart HTTP transport could not read large data packets has been fixed. Previously, fetching from servers like Gerrit, that sent large data packets, would error.

v1.0

This is release v1.0 "Luftschloss", which is the first stabe release of libgit2. The API will stay compatible across all releases of the same major version. This release includes bugfixes only and supersedes v0.99, which will stop being maintained. Both v0.27 and v0.28 stay supported in accordance with our release policy.

Changes or improvements

CMake was converted to make use of the GNUInstallDirs module for both our pkgconfig and install targets in favor of our custom build options BIN_INSTALL_DIR, LIB_INSTALL_DIR and INCLUDE_INSTALL_DIR. Instead, you can now use CMakes standard variables CMAKE_INSTALL_BINDIR, CMAKE_INSTALL_LIBDIR and CMAKE_INSTALL_INCLUDEDIR.
Some CMake build options accepted either a specific value or a boolean value to disable the option altogether or use automatic detection. We only accepted "ON" or "OFF", but none of the other values CMake recognizes as boolean. This was aligned with CMake's understanding of booleans.
The installed pkgconfig file contained incorrect values for both libdir and includedir variables.
If using pcre2 for regular expressions, then we incorrectly added "pcre2" instead of "pcre2-8" to our pkgconfig dependencies, which was corrected.
Fixed building the bundled ntlmclient dependency on FreeBSD, OpenBSD and SunOS.
When writing symlinks on Windows, we incorrectly handled relative symlink targets, which was corrected.
When using the HTTP protocol via macOS' SecureTransport implementation, reads could stall at the end of the session and only continue after a timeout of 60 seconds was reached.
The filesystem-based reference callback didn't corectly initialize the backend version.
A segmentation fault was fixed when calling git_blame_buffer() for files that were modified and added to the index.
A backwards-incompatible change was introduced when we moved some structures from "git2/credentials.h" into "git2/sys/credentials.h". This was fixed in the case where you do not use hard deprecation.
Improved error handling in various places.

v0.99

This is v0.99 "Torschlusspanik". This will be the last minor release before libgit2 v1.0. We expect to only respond to bugs in this release, to stabilize it for next major release.

It contains significant refactorings, but is expected to be API-compatible with v0.28.0.

Changes or improvements

When fetching from an anonymous remote using a URL with authentication information provided in the URL (eg https://foo:bar@example.com/repo), we would erroneously include the literal URL in the FETCH_HEAD file. We now remove that to match git's behavior.
Some credential structures, enums and values have been renamed: git_cred is now git_credential. git_credtype_t is now git_credential_t. Functions and types beginning with git_cred_ now begin with git_credential, and constants beginning with GIT_CREDTYPE now begin with GIT_CREDENTIAL. The former names are deprecated.
Several function signatures have been changed to return an int to indicate error conditions. We encourage you to check them for errors in the standard way.
- git_attr_cache_flush
- git_error_set_str
- git_index_name_clear
- git_index_reuc_clear
- git_libgit2_version
- git_mempack_reset
- git_oid_cpy
- git_oid_fmt
- git_oid_fromraw
- git_oid_nfmt
- git_oid_pathfmt
- git_remote_stop
- git_remote_disconnect
- git_repository__cleanup
- git_repository_set_config
- git_repository_set_index
- git_repository_set_odb
- git_repository_set_refdb
- git_revwalk_reset
- git_revwalk_simplify_first_parent
- git_revwalk_sorting
- git_treebuilder_clear
- git_treebuilder_filter
The NTLM and Negotiate authentication mechanisms are now supported when talking to git implementations hosted on Apache or nginx servers.
The HEAD symbolic reference can no longer be deleted.
git_merge_driver_source_repo no longer returns a const git_repository *, it now returns a non-const git_repository *.
Relative symbolic links are now supported on Windows when core.symlinks is enabled.
Servers that provide query parameters with a redirect are now supported.
git_submodule_sync will now resolve relative URLs.
When creating git endpoint URLs, double-slashes are no longer used when the given git URL has a trailing slash.
On Windows, a DllMain function is no longer included and thread-local storage has moved to fiber-local storage in order to prevent race conditions during shutdown.
The tracing mechanism (GIT_TRACE) is now enabled by default and does not need to be explicitly enabled in CMake.
The size of Git objects is now represented by git_object_size_t instead of off_t.
Binary patches without data can now be parsed.
A configuration snapshot can now be created from another configuration snapshot, not just a "true" configuration object.
The git_commit_with_signature API will now ensure that referenced objects exist in the object database.
Stash messages containing newlines will now be replaced with spaces; they will no longer be (erroneously) written to the repository.
git_commit_create_with_signature now verifies the commit information to ensure that it points to a valid tree and valid parents.
git_apply has an option GIT_APPLY_CHECK that will only do a dry-run. The index and working directory will remain unmodified, and application will report if it would have worked.
Patches produced by Mercurial (those that lack some git extended headers) can now be parsed and applied.
Reference locks are obeyed correctly on POSIX platforms, instead of being removed.
Patches with empty new files can now be read and applied.
git_apply_to_tree can now correctly apply patches that add new files.
The program data configuration on Windows (C:\ProgramData\Git\config) must be owned by an administrator, a system account or the current user to be read.
git_blob_filtered_content is now deprecated in favor of git_blob_filter.
Configuration files can now be included conditionally using the onbranch conditional.
Checkout can now properly create and remove symbolic links to directories on Windows.
Stash no longer recomputes trees when committing a worktree, for improved performance.
Repository templates can now include a HEAD file to default the initial default branch.
Some configuration structures, enums and values have been renamed: git_cvar_map is now git_configmap, git_cvar_t is now git_configmap_t, GIT_CVAR_FALSE is now GIT_CONFIGMAP_FALSE, GIT_CVAR_TRUE is now GIT_CONFIGMAP_TRUE, GIT_CVAR_INT32 is now GIT_CONFIGMAP_INT32, and GIT_CVAR_STRING is now GIT_CONFIGMAP_STRING. The former names are deprecated.
Repositories can now be created at the root of a Windows drive.
Configuration lookups are now more efficiently cached.
git_commit_create_with_signature now supports a NULL signature, which will create a commit without adding a signature.
When a repository lacks an info "common directory", we will no longer erroneously return GIT_ENOTFOUND for all attribute lookups.
Several attribute macros have been renamed: GIT_ATTR_TRUE is now GIT_ATTR_IS_TRUE, GIT_ATTR_FALSE is now GIT_ATTR_IS_FALSE, GIT_ATTR_UNSPECIFIED is now GIT_ATTR_IS_UNSPECIFIED. The attribute enum git_attr_t is now git_attr_value_t and its values have been renamed: GIT_ATTR_UNSPECIFIED_T is now GIT_ATTR_VALUE_UNSPECIFIED, GIT_ATTR_TRUE_T is now GIT_ATTR_VALUE_TRUE, GIT_ATTR_FALSE_T is now GIT_ATTR_VALUE_FALSE, and GIT_ATTR_VALUE_T is now GIT_ATTR_VALUE_STRING. The former names are deprecated.
git_object__size is now git_object_size. The former name is deprecated.
git_tag_create_frombuffer is now git_tag_create_from_buffer. The former name is deprecated.
Several blob creation functions have been renamed: git_blob_create_frombuffer is now named git_blob_create_from_buffer, git_blob_create_fromdisk is now named git_blob_create_from_disk, git_blob_create_fromworkdir is now named git_blob_create_from_workdir, git_blob_create_fromstream is now named git_blob_create_from_stream, and git_blob_create_fromstream_commit is now named git_blob_create_from_stream_commit. The former names are deprecated.
The function git_oid_iszero is now named git_oid_is_zero. The former name is deprecated.
Pattern matching is now done using wildmatch instead of fnmatch for compatibility with git.
The option initialization functions suffixed by init_options are now suffixed with options_init. (For example, git_checkout_init_options is now git_checkout_options_init.) The former names are deprecated.
NTLM2 authentication is now supported on non-Windows platforms.
The git_cred_sign_callback callback is now named git_cred_sign_cb. The git_cred_ssh_interactive_callback callback is now named git_cred_ssh_interactive_cb.
Ignore files now:
- honor escaped trailing whitespace.
- do not incorrectly negate sibling paths of a negated pattern.
- honor rules that stop ignoring files after a wildcard
Attribute files now:
- honor leading and trailing whitespace.
- treat paths beginning with \ as absolute only on Windows.
- properly handle escaped characters.
- stop reading macros defined in subdirectories
The C locale is now correctly used when parsing regular expressions.
The system PCRE2 or PCRE regular expression libraries are now used when regcomp_l is not available on the system. If none of these are available on the system, an included version of PCRE is used.
Wildcards in reference specifications are now supported beyond simply a bare wildcard (*) for compatibility with git.
When git_ignore_path_is_ignored is provided a path with a trailing slash (eg, dir/), it will now treat it as a directory for the purposes of ignore matching.
Patches that add or remove a file with a space in the path can now be correctly parsed.
The git_remote_completion_type type is now git_remote_completion_t. The former name is deprecated.
The git_odb_backend_malloc is now git_odb_backend_data_alloc. The former name is deprecated.
The git_transfer_progress_cb callback is now git_indexer_progress_cb and the git_transfer_progress structure is now git_indexer_progress. The former names are deprecated.
The example projects are now contained in a single lg2 executable for ease of use.
libgit2 now correctly handles more URLs, such as http://example.com:/repo.git (colon but no port), http://example.com (no path), and http://example.com:8080/ (path is /, nonstandard port).
A carefully constructed commit object with a very large number of parents may lead to potential out-of-bounds writes or potential denial of service.
The ProgramData configuration file is always read for compatibility with Git for Windows and Portable Git installations. The ProgramData location is not necessarily writable only by administrators, so we now ensure that the configuration file is owned by the administrator or the current user.

API additions

The SSH host key now supports SHA-256 when GIT_CERT_SSH_SHA256 is set.
The diff format option GIT_DIFF_FORMAT_PATCH_ID can now be used to emit an output like git patch-id.
The git_apply_options_init function will initialize a git_apply_options structure.
The remote callbacks structure adds a git_url_resolve_cb callback that is invoked when connecting to a server, so that applications may edit or replace the URL before connection.
The information about the original HEAD in a rebase operation is available with git_rebase_orig_head_name. Its ID is available with git_rebase_orig_head_id. The onto reference name is available with git_rebase_onto_name and its ID is available with git_rebase_onto_id.
ODB backends can now free backend data when an error occurs during its backend data creation using git_odb_backend_data_free.
Options may be specified to git_repository_foreach_head to control its behavior: GIT_REPOSITORY_FOREACH_HEAD_SKIP_REPO will not skip the main repository's HEAD reference, while GIT_REPOSITORY_FOREACH_HEAD_SKIP_WORKTREES will now skip the worktree HEAD references.
The GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS option can be specified to git_libgit2_opts() to avoid looking for .keep files that correspond to packfiles. This setting can improve performance when packfiles are stored on high-latency filesystems like network filesystems.
Blobs can now be filtered with git_blob_filter, which allows for options to be set with git_blob_filter_options, including GIT_FILTER_NO_SYSTEM_ATTRIBUTES to disable filtering with system-level attributes in /etc/gitattributes and GIT_ATTR_CHECK_INCLUDE_HEAD to enable filtering with .gitattributes files in the HEAD revision.

API removals

The unused git_headlist_cb function declaration was removed.
The unused git_time_monotonic API is removed.
The erroneously exported inttypes.h header was removed.

Security Fixes

CVE-2019-1348: the fast-import stream command "feature export-marks=path" allows writing to arbitrary file paths. As libgit2 does not offer any interface for fast-import, it is not susceptible to this vulnerability.
CVE-2019-1349: by using NTFS 8.3 short names, backslashes or alternate filesystreams, it is possible to cause submodules to be written into pre-existing directories during a recursive clone using git. As libgit2 rejects cloning into non-empty directories by default, it is not susceptible to this vulnerability.
CVE-2019-1350: recursive clones may lead to arbitrary remote code executing due to improper quoting of command line arguments. As libgit2 uses libssh2, which does not require us to perform command line parsing, it is not susceptible to this vulnerability.
CVE-2019-1351: Windows provides the ability to substitute drive letters with arbitrary letters, including multi-byte Unicode letters. To fix any potential issues arising from interpreting such paths as relative paths, we have extended detection of DOS drive prefixes to accomodate for such cases.
CVE-2019-1352: by using NTFS-style alternative file streams for the ".git" directory, it is possible to overwrite parts of the repository. While this has been fixed in the past for Windows, the same vulnerability may also exist on other systems that write to NTFS filesystems. We now reject any paths starting with ".git:" on all systems.
CVE-2019-1353: by using NTFS-style 8.3 short names, it was possible to write to the ".git" directory and thus overwrite parts of the repository, leading to possible remote code execution. While this problem was already fixed in the past for Windows, other systems accessing NTFS filesystems are vulnerable to this issue too. We now enable NTFS protecions by default on all systems to fix this attack vector.
CVE-2019-1354: on Windows, backslashes are not a valid part of a filename but are instead interpreted as directory separators. As other platforms allowed to use such paths, it was possible to write such invalid entries into a Git repository and was thus an attack vector to write into the ".git" dierctory. We now reject any entries starting with ".git" on all systems.
CVE-2019-1387: it is possible to let a submodule's git directory point into a sibling's submodule directory, which may result in overwriting parts of the Git repository and thus lead to arbitrary command execution. As libgit2 doesn't provide any way to do submodule clones natively, it is not susceptible to this vulnerability. Users of libgit2 that have implemented recursive submodule clones manually are encouraged to review their implementation for this vulnerability.

Breaking API changes

The "private" implementation details of the git_cred structure have been moved to a dedicated git2/sys/cred.h header, to clarify that the underlying structures are only provided for custom transport implementers. The breaking change is that the username member of the underlying struct is now hidden, and a new git_cred_get_username function has been provided.
Some errors of class GIT_ERROR_NET now have class GIT_ERROR_HTTP. Most authentication failures now have error code GIT_EAUTH instead of GIT_ERROR.

Breaking CMake configuration changes

The CMake option to use a system http-parser library, instead of the bundled dependency, has changed. This is due to a deficiency in http-parser that we have fixed in our implementation. The bundled library is now the default, but if you wish to force the use of the system http-parser implementation despite incompatibilities, you can specify -DUSE_HTTP_PARSER=system to CMake.
The interactions between USE_HTTPS and SHA1_BACKEND have been streamlined. The detection was moved to a new USE_SHA1, modeled after USE_HTTPS, which takes the values "CollisionDetection/Backend/Generic", to better match how the "hashing backend" is selected, the default (ON) being "CollisionDetection". If you were using SHA1_BACKEND previously, you'll need to check the value you've used, or switch to the autodetection.

Authors

The following individuals provided changes that were included in this release:

Aaron Patterson
Alberto Fanjul
Anders Borum
Augie Fackler
Augustin Fabre
Ayush Shridhar
brian m. carlson
buddyspike
Carlos Martín Nieto
cheese1
Dan Skorupski
Daniel Cohen Gindi
Dave Lee
David Brooks
David Turner
Denis Laxalde
Dhruva Krishnamurthy
Dominik Ritter
Drew DeVault
Edward Thomson
Eric Huss
Erik Aigner
Etienne Samson
Gregory Herrero
Heiko Voigt
Ian Hattendorf
Jacques Germishuys
Janardhan Pulivarthi
Jason Haslam
Johannes Schindelin
Jordan Wallet
Josh Bleecher Snyder
kas
kdj0c
Laurence McGlashan
lhchavez
Lukas Berk
Max Kostyukevich
Patrick Steinhardt
pcpthm
Remy Suen
Robert Coup
romkatv
Scott Furry
Sebastian Henke
Stefan Widgren
Steve King Jr
Sven Strickroth
Tobias Nießen
Tyler Ang-Wanek
Tyler Wanek

v0.28

Changes or improvements

The library is now always built with cdecl calling conventions on Windows; the ability to build a stdcall library has been removed.
Reference log creation now honors core.logallrefupdates=always.
Fix some issues with the error-reporting in the OpenSSL backend.
HTTP proxy support is now builtin; libcurl is no longer used to support proxies and is removed as a dependency.
Certificate and credential callbacks can now return GIT_PASSTHROUGH to decline to act; libgit2 will behave as if there was no callback set in the first place.
The line-ending filtering logic - when checking out files - has been updated to match newer git (>= git 2.9) for proper interoperability.
Symbolic links are now supported on Windows when core.symlinks is set to true.
Submodules with names which attempt to perform path traversal now have their configuration ignored. Such names were blindly appended to the $GIT_DIR/modules and a malicious name could lead to an attacker writing to an arbitrary location. This matches git's handling of CVE-2018-11235.
Object validation is now performed during tree creation in the git_index_write_tree_to API.
Configuration variable may now be specified on the same line as a section header; previously this was erroneously a parser error.
When an HTTP server supports both NTLM and Negotiate authentication mechanisms, we would previously fail to authenticate with any mechanism.
The GIT_OPT_SET_PACK_MAX_OBJECTS option can now set the maximum number of objects allowed in a packfile being downloaded; this can help limit the maximum memory used when fetching from an untrusted remote.
Line numbers in diffs loaded from patch files were not being populated; they are now included in the results.
The repository's index is reloaded from disk at the beginning of git_merge operations to ensure that it is up-to-date.
Mailmap handling APIs have been introduced, and the new commit APIs git_commit_committer_with_mailmap and git_commit_author_with_mailmap will use the mailmap to resolve the committer and author information. In addition, blame will use the mailmap given when the GIT_BLAME_USE_MAILMAP option.
Ignore handling for files in ignored folders would be ignored.
Worktrees can now be backed by bare repositories.
Trailing spaces are supported in .gitignore files, these spaces were previously (and erroneously) treated as part of the pattern.
The library can now be built with mbedTLS support for HTTPS.
The diff status character 'T' will now be presented by the git_diff_status_char API for diff entries that change type.
Revision walks previously would sometimes include commits that should have been ignored; this is corrected.
Revision walks are now more efficient when the output is unsorted; we now avoid walking all the way to the beginning of history unnecessarily.
Error-handling around index extension loading has been fixed. We were previously always misreporting a truncated index (#4858).

API additions

The index may now be iterated atomically using git_index_iterator.
Remote objects can now be created with extended options using the git_remote_create_with_opts API.
Diff objects can now be applied as changes to the working directory, index or both, emulating the git apply command. Additionally, git_apply_to_tree can apply those changes to a tree object as a fully in-memory operation.
You can now swap out memory allocators via the GIT_OPT_SET_ALLOCATOR option with git_libgit2_opts().
You can now ensure that functions do not discard unwritten changes to the index via the GIT_OPT_ENABLE_UNSAVED_INDEX_SAFETY option to git_libgit2_opts(). This will cause functions that implicitly re-read the index (eg, git_checkout) to fail if you have staged changes to the index but you have not written the index to disk. (Unless the checkout has the FORCE flag specified.)

At present, this defaults to off, but we intend to enable this more broadly in the future, as a warning or error. We encourage you to examine your code to ensure that you are not relying on the current behavior that implicitly removes staged changes.
Reference specifications can be parsed from an arbitrary string with the git_refspec_parse API.
You can now get the name and path of worktrees using the git_worktree_name and git_worktree_path APIs, respectively.
The ref field has been added to git_worktree_add_options to enable the creation of a worktree from a pre-existing branch.
It's now possible to analyze merge relationships between any two references, not just against HEAD, using git_merge_analysis_for_ref.

API removals

The git_buf_free API is deprecated; it has been renamed to git_buf_dispose for consistency. The git_buf_free API will be retained for backward compatibility for the foreseeable future.
The git_otype enumeration and its members are deprecated and have been renamed for consistency. The GIT_OBJ_ enumeration values are now prefixed with GIT_OBJECT_. The old enumerations and macros will be retained for backward compatibility for the foreseeable future.
Several index-related APIs have been renamed for consistency. The GIT_IDXENTRY_ enumeration values and macros have been renamed to be prefixed with GIT_INDEX_ENTRY_. The GIT_INDEXCAP enumeration values are now prefixed with GIT_INDEX_CAPABILITY_. The old enumerations and macros will be retained for backward compatibility for the foreseeable future.
The error functions and enumeration values have been renamed for consistency. The giterr_ functions and values prefix have been renamed to be prefixed with git_error_; similarly, the GITERR_ constants have been renamed to be prefixed with GIT_ERROR_. The old enumerations and macros will be retained for backward compatibility for the foreseeable future.

Breaking API changes

The default checkout strategy changed from DRY_RUN to SAFE (#4531).
Adding a symlink as .gitmodules into the index from the workdir or checking out such files is not allowed as this can make a Git implementation write outside of the repository and bypass the fsck checks for CVE-2018-11235.

v0.27

Changes or improvements

Improved p_unlink in posix_w32.c to try and make a file writable before sleeping in the retry loop to prevent unnecessary calls to sleep.
The CMake build infrastructure has been improved to speed up building time.
A new CMake option "-DUSE_HTTPS=" makes it possible to explicitly choose an HTTP backend.
A new CMake option "-DSHA1_BACKEND=" makes it possible to explicitly choose an SHA1 backend. The collision-detecting backend is now the default.
A new CMake option "-DUSE_BUNDLED_ZLIB" makes it possible to explicitly use the bundled zlib library.
A new CMake option "-DENABLE_REPRODUCIBLE_BUILDS" makes it possible to generate a reproducible static archive. This requires support from your toolchain.
The minimum required CMake version has been bumped to 2.8.11.
Writing to a configuration file now preserves the case of the key given by the caller for the case-insensitive portions of the key (existing sections are used even if they don't match).
We now support conditional includes in configuration files.
Fix for handling re-reading of configuration files with includes.
Fix for reading patches which contain exact renames only.
Fix for reading patches with whitespace in the compared files' paths.
We will now fill FETCH_HEAD from all passed refspecs instead of overwriting with the last one.
There is a new diff option, GIT_DIFF_INDENT_HEURISTIC which activates a heuristic which takes into account whitespace and indentation in order to produce better diffs when dealing with ambiguous diff hunks.
Fix for pattern-based ignore rules where files ignored by a rule cannot be un-ignored by another rule.
Sockets opened by libgit2 are now being closed on exec(3) if the platform supports it.
Fix for peeling annotated tags from packed-refs files.
Fix reading huge loose objects from the object database.
Fix files not being treated as modified when only the file mode has changed.
We now explicitly reject adding submodules to the index via git_index_add_frombuffer.
Fix handling of GIT_DIFF_FIND_RENAMES_FROM_REWRITES raising SIGABRT when one file has been deleted and another file has been rewritten.
Fix for WinHTTP not properly handling NTLM and Negotiate challenges.
When using SSH-based transports, we now repeatedly ask for the passphrase to decrypt the private key in case a wrong passphrase is being provided.
When generating conflict markers, they will now use the same line endings as the rest of the file.

API additions

The git_merge_file_options structure now contains a new setting, marker_size. This allows users to set the size of markers that delineate the sides of merged files in the output conflict file. By default this is 7 (GIT_MERGE_CONFLICT_MARKER_SIZE), which produces output markers like <<<<<<< and >>>>>>>.
git_remote_create_detached() creates a remote that is not associated to any repository (and does not apply configuration like 'insteadof' rules). This is mostly useful for e.g. emulating git ls-remote behavior.
git_diff_patchid() lets you generate patch IDs for diffs.
git_status_options now has an additional field baseline to allow creating status lists against different trees.
New family of functions to allow creating notes for a specific notes commit instead of for a notes reference.
New family of functions to allow parsing message trailers. This API is still experimental and may change in future releases.

API removals

Breaking API changes

Signatures now distinguish between +0000 and -0000 UTC offsets.
The certificate check callback in the WinHTTP transport will now receive the message_cb_payload instead of the cred_acquire_payload.
We are now reading symlinked directories under .git/refs.
We now refuse creating branches named "HEAD".
We now refuse reading and writing all-zero object IDs into the object database.
We now read the effective user's configuration file instead of the real user's configuration in case libgit2 runs as part of a setuid binary.
The git_odb_open_rstream function and its readstream callback in the git_odb_backend interface have changed their signatures to allow providing the object's size and type to the caller.

v0.26

Changes or improvements

Support for opening, creating and modifying worktrees.
We can now detect SHA1 collisions resulting from the SHAttered attack. These checks can be enabled at build time via -DUSE_SHA1DC.
Fix for missing implementation of git_merge_driver_source getters.
Fix for installed pkg-config file being broken when the prefix contains spaces.
We now detect when the hashsum of on-disk objects does not match their expected hashsum.
We now support open-ended ranges (e.g. "master..", "...master") in our revision range parsing code.
We now correctly compute ignores with leading "/" in subdirectories.
We now optionally call fsync on loose objects, packfiles and their indexes, loose references and packed reference files.
We can now build against OpenSSL v1.1 and against LibreSSL.
GIT_MERGE_OPTIONS_INIT now includes a setting to perform rename detection. This aligns this structure with the default by git_merge and git_merge_trees when NULL was provided for the options.
Improvements for reading index v4 files.
Perform additional retries for filesystem operations on Windows when files are temporarily locked by other processes.

API additions

New family of functions to handle worktrees:
- git_worktree_list() lets you look up worktrees for a repository.
- git_worktree_lookup() lets you get a specific worktree.
- git_worktree_open_from_repository() lets you get the associated worktree of a repository. a worktree.
- git_worktree_add lets you create new worktrees.
- git_worktree_prune lets you remove worktrees from disk.
- git_worktree_lock() and git_worktree_unlock() let you lock respectively unlock a worktree.
- git_repository_open_from_worktree() lets you open a repository via
- git_repository_head_for_worktree() lets you get the current HEAD for a linked worktree.
- git_repository_head_detached_for_worktree() lets you check whether a linked worktree is in detached HEAD mode.
git_repository_item_path() lets you retrieve paths for various repository files.
git_repository_commondir() lets you retrieve the common directory of a repository.
git_branch_is_checked_out() allows you to check whether a branch is checked out in a repository or any of its worktrees.
git_repository_submodule_cache_all() and git_repository_submodule_cache_clear() functions allow you to prime or clear the submodule cache of a repository.
You can disable strict hash verifications via the GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION option with git_libgit2_opts().
You can enable us calling fsync for various files inside the ".git" directory by setting the GIT_OPT_ENABLE_FSYNC_GITDIR option with git_libgit2_opts().
You can now enable "offset deltas" when creating packfiles and negotiating packfiles with a remote server by setting GIT_OPT_ENABLE_OFS_DELTA option with GIT_libgit2_opts().
You can now set the default share mode on Windows for opening files using GIT_OPT_SET_WINDOWS_SHAREMODE option with git_libgit2_opts(). You can query the current share mode with GIT_OPT_GET_WINDOWS_SHAREMODE.
`git_transport_smart_proxy_options()' enables you to get the proxy options for smart transports.
The GIT_FILTER_INIT macro and the git_filter_init function are provided to initialize a git_filter structure.

Breaking API changes

clone_checkout_strategy has been removed from git_submodule_update_option. The checkout strategy used to clone will be the same strategy specified in checkout_opts.

v0.25

Changes or improvements

Fix repository discovery with git_repository_discover and git_repository_open_ext to match git's handling of a ceiling directory at the current directory. git only checks ceiling directories when its search ascends to a parent directory. A ceiling directory matching the starting directory will not prevent git from finding a repository in the starting directory or a parent directory.
Do not fail when deleting remotes in the presence of broken global configs which contain branches.
Support for reading and writing git index v4 files
Improve the performance of the revwalk and bring us closer to git's code.
The reference db has improved support for concurrency and returns GIT_ELOCKED when an operation could not be performed due to locking.
Nanosecond resolution is now activated by default, following git's change to do this.
We now restrict the set of ciphers we let OpenSSL use by default.
Users can now register their own merge drivers for use with .gitattributes. The library also gained built-in support for the union merge driver.
The default for creating references is now to validate that the object does exist.
Add git_proxy_options which is used by the different networking implementations to let the caller specify the proxy settings instead of relying on the environment variables.

API additions

You can now get the user-agent used by libgit2 using the GIT_OPT_GET_USER_AGENT option with git_libgit2_opts(). It is the counterpart to GIT_OPT_SET_USER_AGENT.
The GIT_OPT_SET_SSL_CIPHERS option for git_libgit2_opts() lets you specify a custom list of ciphers to use for OpenSSL.
git_commit_create_buffer() creates a commit and writes it into a user-provided buffer instead of writing it into the object db. Combine it with git_commit_create_with_signature() in order to create a commit with a cryptographic signature.
git_blob_create_fromstream() and git_blob_create_fromstream_commit() allow you to create a blob by writing into a stream. Useful when you do not know the final size or want to copy the contents from another stream.
New flags for git_repository_open_ext:
- GIT_REPOSITORY_OPEN_NO_DOTGIT - Do not check for a repository by appending /.git to the start_path; only open the repository if start_path itself points to the git directory.
- GIT_REPOSITORY_OPEN_FROM_ENV - Find and open a git repository, respecting the environment variables used by the git command-line tools. If set, git_repository_open_ext will ignore the other flags and the ceiling_dirs argument, and will allow a NULL path to use GIT_DIR or search from the current directory. The search for a repository will respect $GIT_CEILING_DIRECTORIES and $GIT_DISCOVERY_ACROSS_FILESYSTEM. The opened repository will respect $GIT_INDEX_FILE, $GIT_NAMESPACE, $GIT_OBJECT_DIRECTORY, and $GIT_ALTERNATE_OBJECT_DIRECTORIES. In the future, this flag will also cause git_repository_open_ext to respect $GIT_WORK_TREE and $GIT_COMMON_DIR; currently, git_repository_open_ext with this flag will error out if either $GIT_WORK_TREE or $GIT_COMMON_DIR is set.
git_diff_from_buffer() can create a git_diff object from the contents of a git-style patch file.
git_index_version() and git_index_set_version() to get and set the index version
git_odb_expand_ids() lets you check for the existence of multiple objects at once.
The new git_blob_dup(), git_commit_dup(), git_tag_dup() and git_tree_dup() functions provide type-specific wrappers for git_object_dup() to reduce noise and increase type safety for callers.
git_reference_dup() lets you duplicate a reference to aid in ownership management and cleanup.
git_signature_from_buffer() lets you create a signature from a string in the format that appear in objects.
git_tree_create_updated() lets you create a tree based on another one together with a list of updates. For the covered update cases, it's more efficient than the git_index route.
git_apply_patch() applies hunks from a git_patch to a buffer.
git_diff_to_buf() lets you print an entire diff directory to a buffer, similar to how git_patch_to_buf() works.
git_proxy_init_options() is added to initialize a git_proxy_options structure at run-time.
git_merge_driver_register(), git_merge_driver_unregister() let you register and unregister a custom merge driver to be used when .gitattributes specifies it.
git_merge_driver_lookup() can be used to look up a merge driver by name.
git_merge_driver_source_repo(), git_merge_driver_source_ancestor(), git_merge_driver_source_ours(), git_merge_driver_source_theirs(), git_merge_driver_source_file_options() added as accessors to git_merge_driver_source.

API removals

git_blob_create_fromchunks() has been removed in favour of git_blob_create_fromstream().

Breaking API changes

git_packbuilder_object_count and git_packbuilder_written now return a size_t instead of a uint32_t for more thorough compatibility with the rest of the library.
git_packbuiler_progress now provides explicitly sized uint32_t values instead of unsigned int.
git_diff_file now includes an id_abbrev field that reflects the number of nibbles set in the id field.
git_odb_backend now has a freshen function pointer. This optional function pointer is similar to the exists function, but it will update a last-used marker. For filesystem-based object databases, this updates the timestamp of the file containing the object, to indicate "freshness". If this is NULL, then it will not be called and the exists function will be used instead.
git_remote_connect() now accepts git_proxy_options argument, and git_fetch_options and git_push_options each have a proxy_opts field.
git_merge_options now provides a default_driver that can be used to provide the name of a merge driver to be used to handle files changed during a merge.

v0.24

Changes or improvements

Custom merge drivers can now be registered, which allows callers to configure callbacks to honor merge=driver configuration in .gitattributes.
Custom filters can now be registered with wildcard attributes, for example filter=*. Consumers should examine the attributes parameter of the check function for details.
Symlinks are now followed when locking a file, which can be necessary when multiple worktrees share a base repository.
You can now set your own user-agent to be sent for HTTP requests by using the GIT_OPT_SET_USER_AGENT with git_libgit2_opts().
You can set custom HTTP header fields to be sent along with requests by passing them in the fetch and push options.
Tree objects are now assumed to be sorted. If a tree is not correctly formed, it will give bad results. This is the git approach and cuts a significant amount of time when reading the trees.
Filter registration is now protected against concurrent registration.
Filenames which are not valid on Windows in an index no longer cause to fail to parse it on that OS.
Rebases can now be performed purely in-memory, without touching the repository's workdir.
When adding objects to the index, or when creating new tree or commit objects, the inputs are validated to ensure that the dependent objects exist and are of the correct type. This object validation can be disabled with the GIT_OPT_ENABLE_STRICT_OBJECT_CREATION option.
The WinHTTP transport's handling of bad credentials now behaves like the others, asking for credentials again.

API additions

git_config_lock() has been added, which allow for transactional/atomic complex updates to the configuration, removing the opportunity for concurrent operations and not committing any changes until the unlock.
git_diff_options added a new callback progress_cb to report on the progress of the diff as files are being compared. The documentation of the existing callback notify_cb was updated to reflect that it only gets called when new deltas are added to the diff.
git_fetch_options and git_push_options have gained a custom_headers field to set the extra HTTP header fields to send.
git_stream_register_tls() lets you register a callback to be used as the constructor for a TLS stream instead of the libgit2 built-in one.
git_commit_header_field() allows you to look up a specific header field in a commit.
git_commit_extract_signature() extracts the signature from a commit and gives you both the signature and the signed data so you can verify it.

API removals

No APIs were removed in this version.

Breaking API changes

The git_merge_tree_flag_t is now git_merge_flag_t. Subsequently, its members are no longer prefixed with GIT_MERGE_TREE_FLAG but are now prefixed with GIT_MERGE_FLAG, and the tree_flags field of the git_merge_options structure is now named flags.
The git_merge_file_flags_t enum is now git_merge_file_flag_t for consistency with other enum type names.
git_cert descendent types now have a proper parent member
It is the responsibility of the refdb backend to decide what to do with the reflog on ref deletion. The file-based backend must delete it, a database-backed one may wish to archive it.
git_config_backend has gained two entries. lock and unlock with which to implement the transactional/atomic semantics for the configuration backend.
git_index_add and git_index_conflict_add() will now use the case as provided by the caller on case insensitive systems. Previous versions would keep the case as it existed in the index. This does not affect the higher-level git_index_add_bypath or git_index_add_frombuffer functions.
The notify_payload field of git_diff_options was renamed to payload to reflect that it's also the payload for the new progress callback.
The git_config_level_t enum has gained a higher-priority value GIT_CONFIG_LEVEL_PROGRAMDATA which represent a rough Windows equivalent to the system level configuration.
git_rebase_options now has a merge_options field.
The index no longer performs locking itself. This is not something users of the library should have been relying on as it's not part of the concurrency guarantees.
git_remote_connect() now takes a custom_headers argument to set the extra HTTP header fields to send.

v0.23

Changes or improvements

Patience and minimal diff drivers can now be used for merges.
Merges can now ignore whitespace changes.
Updated binary identification in CRLF filtering to avoid false positives in UTF-8 files.
Rename and copy detection is enabled for small files.
Checkout can now handle an initial checkout of a repository, making GIT_CHECKOUT_SAFE_CREATE unnecessary for users of clone.
The signature parameter in the ref-modifying functions has been removed. Use git_repository_set_ident() and git_repository_ident() to override the signature to be used.
The local transport now auto-scales the number of threads to use when creating the packfile instead of sticking to one.
Reference renaming now uses the right id for the old value.
The annotated version of branch creation, HEAD detaching and reset allow for specifying the expression from the user to be put into the reflog.
git_rebase_commit now returns GIT_EUNMERGED when you attempt to commit with unstaged changes.
On Mac OS X, we now use SecureTransport to provide the cryptographic support for HTTPS connections insead of OpenSSL.
Checkout can now accept an index for the baseline computations via the baseline_index member.
The configuration for fetching is no longer stored inside the git_remote struct but has been moved to a git_fetch_options. The remote functions now take these options or the callbacks instead of setting them beforehand.
git_submodule instances are no longer cached or shared across lookup. Each submodule represents the configuration at the time of loading.
The index now uses diffs for add_all() and update_all() which gives it a speed boost and closer semantics to git.
The ssh transport now reports the stderr output from the server as the error message, which allows you to get the "repository not found" messages.
git_index_conflict_add() will remove staged entries that exist for conflicted paths.
The flags for a git_diff_file will now have the GIT_DIFF_FLAG_EXISTS bit set when a file exists on that side of the diff. This is useful for understanding whether a side of the diff exists in the presence of a conflict.
The constructor for a write-stream into the odb now takes git_off_t instead of size_t for the size of the blob, which allows putting large files into the odb on 32-bit systems.
The remote's push and pull URLs now honor the url.$URL.insteadOf configuration. This allows modifying URL prefixes to a custom value via gitconfig.
git_diff_foreach, git_diff_blobs, git_diff_blob_to_buffer, and git_diff_buffers now accept a new binary callback of type git_diff_binary_cb that includes the binary diff information.
The race condition mitigations described in racy-git.txt have been implemented.
If libcurl is installed, we will use it to connect to HTTP(S) servers.

API additions

The git_merge_options gained a file_flags member.
Parsing and retrieving a configuration value as a path is exposed via git_config_parse_path() and git_config_get_path() respectively.
git_repository_set_ident() and git_repository_ident() serve to set and query which identity will be used when writing to the reflog.
git_config_entry_free() frees a config entry.
git_config_get_string_buf() provides a way to safely retrieve a string from a non-snapshot configuration.
git_annotated_commit_from_revspec() allows to get an annotated commit from an extended sha synatx string.
git_repository_set_head_detached_from_annotated(), git_branch_create_from_annotated() and git_reset_from_annotated() allow for the caller to provide an annotated commit through which they can control what expression is put into the reflog as the source/target.
git_index_add_frombuffer() can now create a blob from memory buffer and add it to the index which is attached to a repository.
The structure git_fetch_options has been added to determine the runtime configuration for fetching, such as callbacks, pruning and autotag behaviour. It has the runtime initializer git_fetch_init_options().
The enum git_fetch_prune_t has been added, letting you specify the pruning behaviour for a fetch.
A push operation will notify the caller of what updates it indends to perform on the remote, which provides similar information to git's pre-push hook.
git_stash_apply() can now apply a stashed state from the stash list, placing the data into the working directory and index.
git_stash_pop() will apply a stashed state (like git_stash_apply()) but will remove the stashed state after a successful application.
A new error code GIT_EEOF indicates an early EOF from the server. This typically indicates an error with the URL or configuration of the server, and tools can use this to show messages about failing to communicate with the server.
A new error code GIT_EINVALID indicates that an argument to a function is invalid, or an invalid operation was requested.
git_diff_index_to_workdir() and git_diff_tree_to_index() will now produce deltas of type GIT_DELTA_CONFLICTED to indicate that the index side of the delta is a conflict.
The git_status family of functions will now produce status of type GIT_STATUS_CONFLICTED to indicate that a conflict exists for that file in the index.
git_index_entry_is_conflict() is a utility function to determine if a given index entry has a non-zero stage entry, indicating that it is one side of a conflict.
It is now possible to pass a keypair via a buffer instead of a path. For this, GIT_CREDTYPE_SSH_MEMORY and git_cred_ssh_key_memory_new() have been added.
git_filter_list_contains will indicate whether a particular filter will be run in the given filter list.
git_commit_header_field() has been added, which allows retrieving the contents of an arbitrary header field.
git_submodule_set_branch() allows to set the configured branch for a submodule.

API removals

git_remote_save() and git_remote_clear_refspecs() have been removed. Remote's configuration is changed via the configuration directly or through a convenience function which performs changes to the configuration directly.
git_remote_set_callbacks(), git_remote_get_callbacks() and git_remote_set_transport() have been removed and the remote no longer stores this configuration.
git_remote_set_fetch_refpecs() and git_remote_set_push_refspecs() have been removed. There is no longer a way to set the base refspecs at run-time.
git_submodule_save() has been removed. The submodules are no longer configured via the objects.
git_submodule_reload_all() has been removed as we no longer cache submodules.

Breaking API changes

git_smart_subtransport_cb now has a param parameter.
The git_merge_options structure member flags has been renamed to tree_flags.
The git_merge_file_options structure member flags is now an unsigned int. It was previously a git_merge_file_flags_t.
GIT_CHECKOUT_SAFE_CREATE has been removed. Most users will generally be able to switch to GIT_CHECKOUT_SAFE, but if you require missing file handling during checkout, you may now use GIT_CHECKOUT_SAFE | GIT_CHECKOUT_RECREATE_MISSING.
The git_clone_options and git_submodule_update_options structures no longer have a signature field.
The following functions have removed the signature and/or log message parameters in favour of git-emulating ones.
- git_branch_create(), git_branch_move()
- git_rebase_init(), git_rebase_abort()
- git_reference_symbolic_create_matching(), git_reference_symbolic_create(), git_reference_create(), git_reference_create_matching(), git_reference_symbolic_set_target(), git_reference_set_target(), git_reference_rename()
- git_remote_update_tips(), git_remote_fetch(), git_remote_push()
- git_repository_set_head(), git_repository_set_head_detached(), git_repository_detach_head()
- git_reset()
git_config_get_entry() now gives back a ref-counted git_config_entry. You must free it when you no longer need it.
git_config_get_string() will return an error if used on a non-snapshot configuration, as there can be no guarantee that the returned pointer is valid.
git_note_default_ref() now uses a git_buf to return the string, as the string is otherwise not guaranteed to stay allocated.
git_rebase_operation_current() will return GIT_REBASE_NO_OPERATION if it is called immediately after creating a rebase session but before you have applied the first patch.
git_rebase_options now contains a git_checkout_options struct that will be used for functions that modify the working directory, namely git_rebase_init, git_rebase_next and git_rebase_abort. As a result, git_rebase_open now also takes a git_rebase_options and only the git_rebase_init and git_rebase_open functions take a git_rebase_options, where they will persist the options to subsequent git_rebase calls.
The git_clone_options struct now has fetch options in a fetch_opts field instead of remote callbacks in remote_callbacks.
The remote callbacks has gained a new member push_negotiation which gets called before sending the update commands to the server.
The following functions no longer act on a remote instance but change the repository's configuration. Their signatures have changed accordingly:
- git_remote_set_url(), git_remote_seturl()
- git_remote_add_fetch(), git_remote_add_push() and
- git_remote_set_autotag()
git_remote_connect() and git_remote_prune() now take a pointer to the callbacks.
git_remote_fetch() and git_remote_download() now take a pointer to fetch options which determine the runtime configuration.
The git_remote_autotag_option_t values have been changed. It has gained a _UNSPECIFIED default value to specify no override for the configured setting.
git_remote_update_tips() now takes a pointer to the callbacks as well as a boolean whether to write FETCH_HEAD and the autotag setting.
git_remote_create_anonymous() no longer takes a fetch refspec as url-only remotes cannot have configured refspecs.
The git_submodule_update_options struct now has fetch options in the fetch_opts field instead of callbacks in the remote_callbacks field.
The following functions no longer act on a submodule instance but change the repository's configuration. Their signatures have changed accordingly:
- git_submodule_set_url(), git_submodule_set_ignore(), git_submodule_set_update(), git_submodule_set_fetch_recurse_submodules().
git_submodule_status() no longer takes a submodule instance but a repsitory, a submodule name and an ignore setting.
The push function in the git_transport interface now takes a pointer to the remote callbacks.
The git_index_entry struct's fields' types have been changed to more accurately reflect what is in fact stored in the index. Specifically, time and file size are 32 bits intead of 64, as these values are truncated.
GIT_EMERGECONFLICT is now GIT_ECONFLICT, which more accurately describes the nature of the error.
It is no longer allowed to call git_buf_grow() on buffers borrowing the memory they point to.

v0.22

Changes or improvements

git_signature_new() now requires a non-empty email address.
Use CommonCrypto libraries for SHA-1 calculation on Mac OS X.
Disable SSL compression and SSLv2 and SSLv3 ciphers in favor of TLSv1 in OpenSSL.
The fetch behavior of remotes with autotag set to GIT_REMOTE_DOWNLOAD_TAGS_ALL has been changed to match git 1.9.0 and later. In this mode, libgit2 now fetches all tags in addition to whatever else needs to be fetched.
git_checkout() now handles case-changing renames correctly on case-insensitive filesystems; for example renaming "readme" to "README".
The search for libssh2 is now done via pkg-config instead of a custom search of a few directories.
Add support for core.protectHFS and core.protectNTFS. Add more validation for filenames which we write such as references.
The local transport now generates textual progress output like git-upload-pack does ("counting objects").
git_checkout_index() can now check out an in-memory index that is not necessarily the repository's index, so you may check out an index that was produced by git_merge and friends while retaining the cached information.
Remove the default timeout for receiving / sending data over HTTP using the WinHTTP transport layer.
Add SPNEGO (Kerberos) authentication using GSSAPI on Unix systems.
Provide built-in objects for the empty blob (e69de29) and empty tree (4b825dc) objects.
The index' tree cache is now filled upon read-tree and write-tree and the cache is written to disk.
LF -> CRLF filter refuses to handle mixed-EOL files
LF -> CRLF filter now runs when * text = auto (with Git for Windows 1.9.4)
File unlocks are atomic again via rename. Read-only files on Windows are made read-write if necessary.
Share open packfiles across repositories to share descriptors and mmaps.
Use a map for the treebuilder, making insertion O(1)
The build system now accepts an option EMBED_SSH_PATH which when set tells it to include a copy of libssh2 at the given location. This is enabled for MSVC.
Add support for refspecs with the asterisk in the middle of a pattern.
Fetching now performs opportunistic updates. To achieve this, we introduce a difference between active and passive refspecs, which make git_remote_download() and git_remote_fetch() to take a list of resfpecs to be the active list, similarly to how git fetch accepts a list on the command-line.
The THREADSAFE option to build libgit2 with threading support has been flipped to be on by default.
The remote object has learnt to prune remote-tracking branches. If the remote is configured to do so, this will happen via git_remote_fetch(). You can also call git_remote_prune() after connecting or fetching to perform the prune.

API additions

Introduce git_buf_text_is_binary() and git_buf_text_contains_nul() for consumers to perform binary detection on a git_buf.
git_branch_upstream_remote() has been introduced to provide the branch..remote configuration value.
Introduce git_describe_commit() and git_describe_workdir() to provide a description of the current commit (and working tree, respectively) based on the nearest tag or reference
Introduce git_merge_bases() and the git_oidarray type to expose all merge bases between two commits.
Introduce git_merge_bases_many() to expose all merge bases between multiple commits.
Introduce rebase functionality (using the merge algorithm only). Introduce git_rebase_init() to begin a new rebase session, git_rebase_open() to open an in-progress rebase session, git_rebase_commit() to commit the current rebase operation, git_rebase_next() to apply the next rebase operation, git_rebase_abort() to abort an in-progress rebase and git_rebase_finish() to complete a rebase operation.
Introduce git_note_author() and git_note_committer() to get the author and committer information on a git_note, respectively.
A factory function for ssh has been added which allows to change the path of the programs to execute for receive-pack and upload-pack on the server, git_transport_ssh_with_paths().
The ssh transport supports asking the remote host for accepted credential types as well as multiple challeges using a single connection. This requires to know which username you want to connect as, so this introduces the USERNAME credential type which the ssh transport will use to ask for the username.
The GIT_EPEEL error code has been introduced when we cannot peel a tag to the requested object type; if the given object otherwise cannot be peeled, GIT_EINVALIDSPEC is returned.
Introduce GIT_REPOSITORY_INIT_RELATIVE_GITLINK to use relative paths when writing gitlinks, as is used by git core for submodules.
git_remote_prune() has been added. See above for description.
Introduce reference transactions, which allow multiple references to be locked at the same time and updates be queued. This also allows us to safely update a reflog with arbitrary contents, as we need to do for stash.

API removals

git_remote_supported_url() and git_remote_is_valid_url() have been removed as they have become essentially useless with rsync-style ssh paths.
git_clone_into() and git_clone_local_into() have been removed from the public API in favour of git_clone callbacks.
The option to ignore certificate errors via git_remote_cert_check() is no longer present. Instead, git_remote_callbacks has gained a new entry which lets the user perform their own certificate checks.

Breaking API changes

git_cherry_pick() is now git_cherrypick().
The git_submodule_update() function was renamed to git_submodule_update_strategy(). git_submodule_update() is now used to provide functionalty similar to "git submodule update".
git_treebuilder_create() was renamed to git_treebuilder_new() to better reflect it being a constructor rather than something which writes to disk.
git_treebuilder_new() (was git_treebuilder_create()) now takes a repository so that it can query repository configuration. Subsequently, git_treebuilder_write() no longer takes a repository.
git_threads_init() and git_threads_shutdown() have been renamed to git_libgit2_init() and git_libgit2_shutdown() to better explain what their purpose is, as it's grown to be more than just about threads.
git_libgit2_init() and git_libgit2_shutdown() now return the number of initializations of the library, so consumers may schedule work on the first initialization.
The git_transport_register() function no longer takes a priority and takes a URL scheme name (eg "http") instead of a prefix like "http://"
git_index_name_entrycount() and git_index_reuc_entrycount() now return size_t instead of unsigned int.
The context_lines and interhunk_lines fields in git_diff_options are now uint32_t instead of uint16_t. This allows to set them to UINT_MAX, in effect asking for "infinite" context e.g. to iterate over all the unmodified lines of a diff.
git_status_file() now takes an exact path. Use git_status_list_new() if pathspec searching is needed.
git_note_create() has changed the position of the notes reference name to match git_note_remove().
Rename git_remote_load() to git_remote_lookup() to bring it in line with the rest of the lookup functions.
git_remote_rename() now takes the repository and the remote's current name. Accepting a remote indicates we want to change it, which we only did partially. It is much clearer if we accept a name and no loaded objects are changed.
git_remote_delete() now accepts the repository and the remote's name instead of a loaded remote.
git_merge_head is now git_annotated_commit, to better reflect its usage for multiple functions (including rebase)
The git_clone_options struct no longer provides the ignore_cert_errors or remote_name members for remote customization.

Instead, the git_clone_options struct has two new members, remote_cb and remote_cb_payload, which allow the caller to completely override the remote creation process. If needed, the caller can use this callback to give their remote a name other than the default (origin) or disable cert checking.

The remote_callbacks member has been preserved for convenience, although it is not used when a remote creation callback is supplied.
The git_clone_options struct now provides repository_cb and repository_cb_payload to allow the user to create a repository with custom options.
The git_push struct to perform a push has been replaced with git_remote_upload(). The refspecs and options are passed as a function argument. git_push_update_tips() is now also git_remote_update_tips() and the callbacks are in the same struct as the rest.
The git_remote_set_transport() function now sets a transport factory function, rather than a pre-existing transport instance.
The git_transport structure definition has moved into the sys/transport.h file.
libgit2 no longer automatically sets the OpenSSL locking functions. This is not something which we can know to do. A last-resort convenience function is provided in sys/openssl.h, git_openssl_set_locking() which can be used to set the locking.
git_reference_*() functions use mmap() + binary search for packed refs lookups when using the fs backend. Previously all entries were read into a hashtable, which could be slow for repositories with a large number of refs.

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v1.8.2

What's Changed

New features

Bug fixes

Build and CI improvements

v1.8.1

What's Changed

New features

Bug fixes

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New Contributors

v1.8

Major changes

Breaking changes

Other changes

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Bug fixes

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v1.7

Major changes

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v1.6.3

What's Changed

Bug fixes

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v1.6.2

What's Changed

Bug fixes

v1.6

What's Changed

New features

Bug fixes

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v1.5

What's Changed

New features

Bug fixes

Security fixes

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v1.4

What's Changed

New features

Bug fixes

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v1.3

New Features

Deprecated APIs

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