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rebase.c
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/*
* "git rebase" builtin command
*
* Copyright (c) 2018 Pratik Karki
*/
#include "builtin.h"
#include "run-command.h"
#include "exec-cmd.h"
#include "argv-array.h"
#include "dir.h"
#include "packfile.h"
#include "refs.h"
#include "quote.h"
#include "config.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "lockfile.h"
#include "parse-options.h"
#include "commit.h"
#include "diff.h"
#include "wt-status.h"
#include "revision.h"
#include "rerere.h"
static char const * const builtin_rebase_usage[] = {
N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
"[<upstream>] [<branch>]"),
N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
"--root [<branch>]"),
N_("git rebase --continue | --abort | --skip | --edit-todo"),
NULL
};
static GIT_PATH_FUNC(apply_dir, "rebase-apply")
static GIT_PATH_FUNC(merge_dir, "rebase-merge")
enum rebase_type {
REBASE_UNSPECIFIED = -1,
REBASE_AM,
REBASE_MERGE,
REBASE_INTERACTIVE,
REBASE_PRESERVE_MERGES
};
static int use_builtin_rebase(void)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf out = STRBUF_INIT;
int ret;
argv_array_pushl(&cp.args,
"config", "--bool", "rebase.usebuiltin", NULL);
cp.git_cmd = 1;
if (capture_command(&cp, &out, 6)) {
strbuf_release(&out);
return 0;
}
strbuf_trim(&out);
ret = !strcmp("true", out.buf);
strbuf_release(&out);
return ret;
}
struct rebase_options {
enum rebase_type type;
const char *state_dir;
struct commit *upstream;
const char *upstream_name;
const char *upstream_arg;
char *head_name;
struct object_id orig_head;
struct commit *onto;
const char *onto_name;
const char *revisions;
const char *switch_to;
int root;
struct object_id *squash_onto;
struct commit *restrict_revision;
int dont_finish_rebase;
enum {
REBASE_NO_QUIET = 1<<0,
REBASE_VERBOSE = 1<<1,
REBASE_DIFFSTAT = 1<<2,
REBASE_FORCE = 1<<3,
REBASE_INTERACTIVE_EXPLICIT = 1<<4,
} flags;
struct strbuf git_am_opt;
const char *action;
int signoff;
int allow_rerere_autoupdate;
int keep_empty;
int autosquash;
char *gpg_sign_opt;
int autostash;
char *cmd;
int allow_empty_message;
int rebase_merges, rebase_cousins;
char *strategy, *strategy_opts;
struct strbuf git_format_patch_opt;
};
static int is_interactive(struct rebase_options *opts)
{
return opts->type == REBASE_INTERACTIVE ||
opts->type == REBASE_PRESERVE_MERGES;
}
static void imply_interactive(struct rebase_options *opts, const char *option)
{
switch (opts->type) {
case REBASE_AM:
die(_("%s requires an interactive rebase"), option);
break;
case REBASE_INTERACTIVE:
case REBASE_PRESERVE_MERGES:
break;
case REBASE_MERGE:
/* we silently *upgrade* --merge to --interactive if needed */
default:
opts->type = REBASE_INTERACTIVE; /* implied */
break;
}
}
/* Returns the filename prefixed by the state_dir */
static const char *state_dir_path(const char *filename, struct rebase_options *opts)
{
static struct strbuf path = STRBUF_INIT;
static size_t prefix_len;
if (!prefix_len) {
strbuf_addf(&path, "%s/", opts->state_dir);
prefix_len = path.len;
}
strbuf_setlen(&path, prefix_len);
strbuf_addstr(&path, filename);
return path.buf;
}
/* Read one file, then strip line endings */
static int read_one(const char *path, struct strbuf *buf)
{
if (strbuf_read_file(buf, path, 0) < 0)
return error_errno(_("could not read '%s'"), path);
strbuf_trim_trailing_newline(buf);
return 0;
}
/* Initialize the rebase options from the state directory. */
static int read_basic_state(struct rebase_options *opts)
{
struct strbuf head_name = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
struct object_id oid;
if (read_one(state_dir_path("head-name", opts), &head_name) ||
read_one(state_dir_path("onto", opts), &buf))
return -1;
opts->head_name = starts_with(head_name.buf, "refs/") ?
xstrdup(head_name.buf) : NULL;
strbuf_release(&head_name);
if (get_oid(buf.buf, &oid))
return error(_("could not get 'onto': '%s'"), buf.buf);
opts->onto = lookup_commit_or_die(&oid, buf.buf);
/*
* We always write to orig-head, but interactive rebase used to write to
* head. Fall back to reading from head to cover for the case that the
* user upgraded git with an ongoing interactive rebase.
*/
strbuf_reset(&buf);
if (file_exists(state_dir_path("orig-head", opts))) {
if (read_one(state_dir_path("orig-head", opts), &buf))
return -1;
} else if (read_one(state_dir_path("head", opts), &buf))
return -1;
if (get_oid(buf.buf, &opts->orig_head))
return error(_("invalid orig-head: '%s'"), buf.buf);
strbuf_reset(&buf);
if (read_one(state_dir_path("quiet", opts), &buf))
return -1;
if (buf.len)
opts->flags &= ~REBASE_NO_QUIET;
else
opts->flags |= REBASE_NO_QUIET;
if (file_exists(state_dir_path("verbose", opts)))
opts->flags |= REBASE_VERBOSE;
if (file_exists(state_dir_path("signoff", opts))) {
opts->signoff = 1;
opts->flags |= REBASE_FORCE;
}
if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
&buf))
return -1;
if (!strcmp(buf.buf, "--rerere-autoupdate"))
opts->allow_rerere_autoupdate = 1;
else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
opts->allow_rerere_autoupdate = 0;
else
warning(_("ignoring invalid allow_rerere_autoupdate: "
"'%s'"), buf.buf);
} else
opts->allow_rerere_autoupdate = -1;
if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("gpg_sign_opt", opts),
&buf))
return -1;
free(opts->gpg_sign_opt);
opts->gpg_sign_opt = xstrdup(buf.buf);
}
if (file_exists(state_dir_path("strategy", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("strategy", opts), &buf))
return -1;
free(opts->strategy);
opts->strategy = xstrdup(buf.buf);
}
if (file_exists(state_dir_path("strategy_opts", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("strategy_opts", opts), &buf))
return -1;
free(opts->strategy_opts);
opts->strategy_opts = xstrdup(buf.buf);
}
strbuf_release(&buf);
return 0;
}
static int write_basic_state(struct rebase_options *opts)
{
write_file(state_dir_path("head-name", opts), "%s",
opts->head_name ? opts->head_name : "detached HEAD");
write_file(state_dir_path("onto", opts), "%s",
opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
write_file(state_dir_path("orig-head", opts), "%s",
oid_to_hex(&opts->orig_head));
write_file(state_dir_path("quiet", opts), "%s",
opts->flags & REBASE_NO_QUIET ? "" : "t");
if (opts->flags & REBASE_VERBOSE)
write_file(state_dir_path("verbose", opts), "");
if (opts->strategy)
write_file(state_dir_path("strategy", opts), "%s",
opts->strategy);
if (opts->strategy_opts)
write_file(state_dir_path("strategy_opts", opts), "%s",
opts->strategy_opts);
if (opts->allow_rerere_autoupdate >= 0)
write_file(state_dir_path("allow_rerere_autoupdate", opts),
"-%s-rerere-autoupdate",
opts->allow_rerere_autoupdate ? "" : "-no");
if (opts->gpg_sign_opt)
write_file(state_dir_path("gpg_sign_opt", opts), "%s",
opts->gpg_sign_opt);
if (opts->signoff)
write_file(state_dir_path("strategy", opts), "--signoff");
return 0;
}
static int apply_autostash(struct rebase_options *opts)
{
const char *path = state_dir_path("autostash", opts);
struct strbuf autostash = STRBUF_INIT;
struct child_process stash_apply = CHILD_PROCESS_INIT;
if (!file_exists(path))
return 0;
if (read_one(state_dir_path("autostash", opts), &autostash))
return error(_("Could not read '%s'"), path);
argv_array_pushl(&stash_apply.args,
"stash", "apply", autostash.buf, NULL);
stash_apply.git_cmd = 1;
stash_apply.no_stderr = stash_apply.no_stdout =
stash_apply.no_stdin = 1;
if (!run_command(&stash_apply))
printf("Applied autostash.\n");
else {
struct argv_array args = ARGV_ARRAY_INIT;
int res = 0;
argv_array_pushl(&args,
"stash", "store", "-m", "autostash", "-q",
autostash.buf, NULL);
if (run_command_v_opt(args.argv, RUN_GIT_CMD))
res = error(_("Cannot store %s"), autostash.buf);
argv_array_clear(&args);
strbuf_release(&autostash);
if (res)
return res;
fprintf(stderr,
_("Applying autostash resulted in conflicts.\n"
"Your changes are safe in the stash.\n"
"You can run \"git stash pop\" or \"git stash drop\" "
"at any time.\n"));
}
strbuf_release(&autostash);
return 0;
}
static int finish_rebase(struct rebase_options *opts)
{
struct strbuf dir = STRBUF_INIT;
const char *argv_gc_auto[] = { "gc", "--auto", NULL };
delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
apply_autostash(opts);
close_all_packs(the_repository->objects);
/*
* We ignore errors in 'gc --auto', since the
* user should see them.
*/
run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
strbuf_addstr(&dir, opts->state_dir);
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
return 0;
}
static struct commit *peel_committish(const char *name)
{
struct object *obj;
struct object_id oid;
if (get_oid(name, &oid))
return NULL;
obj = parse_object(the_repository, &oid);
return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
}
static void add_var(struct strbuf *buf, const char *name, const char *value)
{
if (!value)
strbuf_addf(buf, "unset %s; ", name);
else {
strbuf_addf(buf, "%s=", name);
sq_quote_buf(buf, value);
strbuf_addstr(buf, "; ");
}
}
static const char *resolvemsg =
N_("Resolve all conflicts manually, mark them as resolved with\n"
"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
"You can instead skip this commit: run \"git rebase --skip\".\n"
"To abort and get back to the state before \"git rebase\", run "
"\"git rebase --abort\".");
static int reset_head(struct object_id *oid, const char *action,
const char *switch_to_branch, int detach_head,
const char *reflog_orig_head, const char *reflog_head);
static int move_to_original_branch(struct rebase_options *opts)
{
struct strbuf buf = STRBUF_INIT;
int ret;
if (opts->head_name && opts->onto)
strbuf_addf(&buf, "rebase finished: %s onto %s",
opts->head_name,
oid_to_hex(&opts->onto->object.oid));
ret = reset_head(NULL, "checkout", opts->head_name, 0,
"HEAD", buf.buf);
strbuf_release(&buf);
return ret;
}
static int run_am(struct rebase_options *opts)
{
struct child_process am = CHILD_PROCESS_INIT;
struct child_process format_patch = CHILD_PROCESS_INIT;
struct strbuf revisions = STRBUF_INIT;
int status;
char *rebased_patches;
am.git_cmd = 1;
argv_array_push(&am.args, "am");
if (opts->action && !strcmp("continue", opts->action)) {
argv_array_push(&am.args, "--resolved");
argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
if (opts->gpg_sign_opt)
argv_array_push(&am.args, opts->gpg_sign_opt);
status = run_command(&am);
if (status)
return status;
discard_cache();
return move_to_original_branch(opts);
}
if (opts->action && !strcmp("skip", opts->action)) {
argv_array_push(&am.args, "--skip");
argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
status = run_command(&am);
if (status)
return status;
discard_cache();
return move_to_original_branch(opts);
}
if (opts->action && !strcmp("show-current-patch", opts->action)) {
argv_array_push(&am.args, "--show-current-patch");
return run_command(&am);
}
strbuf_addf(&revisions, "%s...%s",
oid_to_hex(opts->root ?
/* this is now equivalent to ! -z "$upstream" */
&opts->onto->object.oid :
&opts->upstream->object.oid),
oid_to_hex(&opts->orig_head));
rebased_patches = xstrdup(git_path("rebased-patches"));
format_patch.out = open(rebased_patches, O_WRONLY | O_CREAT, 0666);
if (format_patch.out < 0) {
status = error_errno(_("could not write '%s'"),
rebased_patches);
free(rebased_patches);
argv_array_clear(&am.args);
return status;
}
format_patch.git_cmd = 1;
argv_array_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
"--full-index", "--cherry-pick", "--right-only",
"--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
"--no-cover-letter", "--pretty=mboxrd", NULL);
if (opts->git_format_patch_opt.len)
argv_array_split(&format_patch.args,
opts->git_format_patch_opt.buf);
argv_array_push(&format_patch.args, revisions.buf);
if (opts->restrict_revision)
argv_array_pushf(&format_patch.args, "^%s",
oid_to_hex(&opts->restrict_revision->object.oid));
status = run_command(&format_patch);
if (status) {
unlink(rebased_patches);
free(rebased_patches);
argv_array_clear(&am.args);
reset_head(&opts->orig_head, "checkout", opts->head_name, 0,
"HEAD", NULL);
error(_("\ngit encountered an error while preparing the "
"patches to replay\n"
"these revisions:\n"
"\n %s\n\n"
"As a result, git cannot rebase them."),
opts->revisions);
strbuf_release(&revisions);
return status;
}
strbuf_release(&revisions);
am.in = open(rebased_patches, O_RDONLY);
if (am.in < 0) {
status = error_errno(_("could not read '%s'"),
rebased_patches);
free(rebased_patches);
argv_array_clear(&am.args);
return status;
}
argv_array_split(&am.args, opts->git_am_opt.buf);
argv_array_push(&am.args, "--rebasing");
argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
argv_array_push(&am.args, "--patch-format=mboxrd");
if (opts->allow_rerere_autoupdate > 0)
argv_array_push(&am.args, "--rerere-autoupdate");
else if (opts->allow_rerere_autoupdate == 0)
argv_array_push(&am.args, "--no-rerere-autoupdate");
if (opts->gpg_sign_opt)
argv_array_push(&am.args, opts->gpg_sign_opt);
status = run_command(&am);
unlink(rebased_patches);
free(rebased_patches);
if (!status) {
discard_cache();
return move_to_original_branch(opts);
}
if (is_directory(opts->state_dir))
write_basic_state(opts);
return status;
}
static int run_specific_rebase(struct rebase_options *opts)
{
const char *argv[] = { NULL, NULL };
struct strbuf script_snippet = STRBUF_INIT;
int status;
const char *backend, *backend_func;
if (opts->type == REBASE_INTERACTIVE) {
/* Run builtin interactive rebase */
struct child_process child = CHILD_PROCESS_INIT;
argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
resolvemsg);
if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
argv_array_push(&child.env_array, "GIT_EDITOR=:");
opts->autosquash = 0;
}
child.git_cmd = 1;
argv_array_push(&child.args, "rebase--interactive");
if (opts->action)
argv_array_pushf(&child.args, "--%s", opts->action);
if (opts->keep_empty)
argv_array_push(&child.args, "--keep-empty");
if (opts->rebase_merges)
argv_array_push(&child.args, "--rebase-merges");
if (opts->rebase_cousins)
argv_array_push(&child.args, "--rebase-cousins");
if (opts->autosquash)
argv_array_push(&child.args, "--autosquash");
if (opts->flags & REBASE_VERBOSE)
argv_array_push(&child.args, "--verbose");
if (opts->flags & REBASE_FORCE)
argv_array_push(&child.args, "--no-ff");
if (opts->restrict_revision)
argv_array_pushf(&child.args,
"--restrict-revision=^%s",
oid_to_hex(&opts->restrict_revision->object.oid));
if (opts->upstream)
argv_array_pushf(&child.args, "--upstream=%s",
oid_to_hex(&opts->upstream->object.oid));
if (opts->onto)
argv_array_pushf(&child.args, "--onto=%s",
oid_to_hex(&opts->onto->object.oid));
if (opts->squash_onto)
argv_array_pushf(&child.args, "--squash-onto=%s",
oid_to_hex(opts->squash_onto));
if (opts->onto_name)
argv_array_pushf(&child.args, "--onto-name=%s",
opts->onto_name);
argv_array_pushf(&child.args, "--head-name=%s",
opts->head_name ?
opts->head_name : "detached HEAD");
if (opts->strategy)
argv_array_pushf(&child.args, "--strategy=%s",
opts->strategy);
if (opts->strategy_opts)
argv_array_pushf(&child.args, "--strategy-opts=%s",
opts->strategy_opts);
if (opts->switch_to)
argv_array_pushf(&child.args, "--switch-to=%s",
opts->switch_to);
if (opts->cmd)
argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
if (opts->allow_empty_message)
argv_array_push(&child.args, "--allow-empty-message");
if (opts->allow_rerere_autoupdate > 0)
argv_array_push(&child.args, "--rerere-autoupdate");
else if (opts->allow_rerere_autoupdate == 0)
argv_array_push(&child.args, "--no-rerere-autoupdate");
if (opts->gpg_sign_opt)
argv_array_push(&child.args, opts->gpg_sign_opt);
if (opts->signoff)
argv_array_push(&child.args, "--signoff");
status = run_command(&child);
goto finished_rebase;
}
if (opts->type == REBASE_AM) {
status = run_am(opts);
goto finished_rebase;
}
add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
add_var(&script_snippet, "state_dir", opts->state_dir);
add_var(&script_snippet, "upstream_name", opts->upstream_name);
add_var(&script_snippet, "upstream", opts->upstream ?
oid_to_hex(&opts->upstream->object.oid) : NULL);
add_var(&script_snippet, "head_name",
opts->head_name ? opts->head_name : "detached HEAD");
add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
add_var(&script_snippet, "onto", opts->onto ?
oid_to_hex(&opts->onto->object.oid) : NULL);
add_var(&script_snippet, "onto_name", opts->onto_name);
add_var(&script_snippet, "revisions", opts->revisions);
add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
add_var(&script_snippet, "GIT_QUIET",
opts->flags & REBASE_NO_QUIET ? "" : "t");
add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
add_var(&script_snippet, "verbose",
opts->flags & REBASE_VERBOSE ? "t" : "");
add_var(&script_snippet, "diffstat",
opts->flags & REBASE_DIFFSTAT ? "t" : "");
add_var(&script_snippet, "force_rebase",
opts->flags & REBASE_FORCE ? "t" : "");
if (opts->switch_to)
add_var(&script_snippet, "switch_to", opts->switch_to);
add_var(&script_snippet, "action", opts->action ? opts->action : "");
add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
add_var(&script_snippet, "allow_rerere_autoupdate",
opts->allow_rerere_autoupdate < 0 ? "" :
opts->allow_rerere_autoupdate ?
"--rerere-autoupdate" : "--no-rerere-autoupdate");
add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
add_var(&script_snippet, "cmd", opts->cmd);
add_var(&script_snippet, "allow_empty_message",
opts->allow_empty_message ? "--allow-empty-message" : "");
add_var(&script_snippet, "rebase_merges",
opts->rebase_merges ? "t" : "");
add_var(&script_snippet, "rebase_cousins",
opts->rebase_cousins ? "t" : "");
add_var(&script_snippet, "strategy", opts->strategy);
add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
add_var(&script_snippet, "squash_onto",
opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
add_var(&script_snippet, "git_format_patch_opt",
opts->git_format_patch_opt.buf);
if (is_interactive(opts) &&
!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
strbuf_addstr(&script_snippet,
"GIT_EDITOR=:; export GIT_EDITOR; ");
opts->autosquash = 0;
}
switch (opts->type) {
case REBASE_AM:
backend = "git-rebase--am";
backend_func = "git_rebase__am";
break;
case REBASE_INTERACTIVE:
backend = "git-rebase--interactive";
backend_func = "git_rebase__interactive";
break;
case REBASE_MERGE:
backend = "git-rebase--merge";
backend_func = "git_rebase__merge";
break;
case REBASE_PRESERVE_MERGES:
backend = "git-rebase--preserve-merges";
backend_func = "git_rebase__preserve_merges";
break;
default:
BUG("Unhandled rebase type %d", opts->type);
break;
}
strbuf_addf(&script_snippet,
". git-sh-setup && . git-rebase--common &&"
" . %s && %s", backend, backend_func);
argv[0] = script_snippet.buf;
status = run_command_v_opt(argv, RUN_USING_SHELL);
finished_rebase:
if (opts->dont_finish_rebase)
; /* do nothing */
else if (status == 0) {
if (!file_exists(state_dir_path("stopped-sha", opts)))
finish_rebase(opts);
} else if (status == 2) {
struct strbuf dir = STRBUF_INIT;
apply_autostash(opts);
strbuf_addstr(&dir, opts->state_dir);
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
die("Nothing to do");
}
strbuf_release(&script_snippet);
return status ? -1 : 0;
}
#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
static int reset_head(struct object_id *oid, const char *action,
const char *switch_to_branch, int detach_head,
const char *reflog_orig_head, const char *reflog_head)
{
struct object_id head_oid;
struct tree_desc desc;
struct lock_file lock = LOCK_INIT;
struct unpack_trees_options unpack_tree_opts;
struct tree *tree;
const char *reflog_action;
struct strbuf msg = STRBUF_INIT;
size_t prefix_len;
struct object_id *orig = NULL, oid_orig,
*old_orig = NULL, oid_old_orig;
int ret = 0;
if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
BUG("Not a fully qualified branch: '%s'", switch_to_branch);
if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
return -1;
if (!oid) {
if (get_oid("HEAD", &head_oid)) {
rollback_lock_file(&lock);
return error(_("could not determine HEAD revision"));
}
oid = &head_oid;
}
memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
setup_unpack_trees_porcelain(&unpack_tree_opts, action);
unpack_tree_opts.head_idx = 1;
unpack_tree_opts.src_index = the_repository->index;
unpack_tree_opts.dst_index = the_repository->index;
unpack_tree_opts.fn = oneway_merge;
unpack_tree_opts.update = 1;
unpack_tree_opts.merge = 1;
if (!detach_head)
unpack_tree_opts.reset = 1;
if (read_index_unmerged(the_repository->index) < 0) {
rollback_lock_file(&lock);
return error(_("could not read index"));
}
if (!fill_tree_descriptor(&desc, oid)) {
error(_("failed to find tree of %s"), oid_to_hex(oid));
rollback_lock_file(&lock);
free((void *)desc.buffer);
return -1;
}
if (unpack_trees(1, &desc, &unpack_tree_opts)) {
rollback_lock_file(&lock);
free((void *)desc.buffer);
return -1;
}
tree = parse_tree_indirect(oid);
prime_cache_tree(the_repository->index, tree);
if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
ret = error(_("could not write index"));
free((void *)desc.buffer);
if (ret)
return ret;
reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
prefix_len = msg.len;
if (!get_oid("ORIG_HEAD", &oid_old_orig))
old_orig = &oid_old_orig;
if (!get_oid("HEAD", &oid_orig)) {
orig = &oid_orig;
if (!reflog_orig_head) {
strbuf_addstr(&msg, "updating ORIG_HEAD");
reflog_orig_head = msg.buf;
}
update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
UPDATE_REFS_MSG_ON_ERR);
} else if (old_orig)
delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
if (!reflog_head) {
strbuf_setlen(&msg, prefix_len);
strbuf_addstr(&msg, "updating HEAD");
reflog_head = msg.buf;
}
if (!switch_to_branch)
ret = update_ref(reflog_head, "HEAD", oid, orig, REF_NO_DEREF,
UPDATE_REFS_MSG_ON_ERR);
else {
ret = create_symref("HEAD", switch_to_branch, msg.buf);
if (!ret)
ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
UPDATE_REFS_MSG_ON_ERR);
}
strbuf_release(&msg);
return ret;
}
static int rebase_config(const char *var, const char *value, void *data)
{
struct rebase_options *opts = data;
if (!strcmp(var, "rebase.stat")) {
if (git_config_bool(var, value))
opts->flags |= REBASE_DIFFSTAT;
else
opts->flags &= !REBASE_DIFFSTAT;
return 0;
}
if (!strcmp(var, "rebase.autosquash")) {
opts->autosquash = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "commit.gpgsign")) {
free(opts->gpg_sign_opt);
opts->gpg_sign_opt = git_config_bool(var, value) ?
xstrdup("-S") : NULL;
return 0;
}
if (!strcmp(var, "rebase.autostash")) {
opts->autostash = git_config_bool(var, value);
return 0;
}
return git_default_config(var, value, data);
}
/*
* Determines whether the commits in from..to are linear, i.e. contain
* no merge commits. This function *expects* `from` to be an ancestor of
* `to`.
*/
static int is_linear_history(struct commit *from, struct commit *to)
{
while (to && to != from) {
parse_commit(to);
if (!to->parents)
return 1;
if (to->parents->next)
return 0;
to = to->parents->item;
}
return 1;
}
static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
struct object_id *merge_base)
{
struct commit *head = lookup_commit(the_repository, head_oid);
struct commit_list *merge_bases;
int res;
if (!head)
return 0;
merge_bases = get_merge_bases(onto, head);
if (merge_bases && !merge_bases->next) {
oidcpy(merge_base, &merge_bases->item->object.oid);
res = !oidcmp(merge_base, &onto->object.oid);
} else {
oidcpy(merge_base, &null_oid);
res = 0;
}
free_commit_list(merge_bases);
return res && is_linear_history(onto, head);
}
/* -i followed by -m is still -i */
static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
{
struct rebase_options *opts = opt->value;
if (!is_interactive(opts))
opts->type = REBASE_MERGE;
return 0;
}
/* -i followed by -p is still explicitly interactive, but -p alone is not */
static int parse_opt_interactive(const struct option *opt, const char *arg,
int unset)
{
struct rebase_options *opts = opt->value;
opts->type = REBASE_INTERACTIVE;
opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
return 0;
}
static void NORETURN error_on_missing_default_upstream(void)
{
struct branch *current_branch = branch_get(NULL);
printf(_("%s\n"
"Please specify which branch you want to rebase against.\n"
"See git-rebase(1) for details.\n"
"\n"
" git rebase '<branch>'\n"
"\n"),
current_branch ? _("There is no tracking information for "
"the current branch.") :
_("You are not currently on a branch."));
if (current_branch) {
const char *remote = current_branch->remote_name;
if (!remote)
remote = _("<remote>");
printf(_("If you wish to set tracking information for this "
"branch you can do so with:\n"
"\n"
" git branch --set-upstream-to=%s/<branch> %s\n"
"\n"),
remote, current_branch->name);
}
exit(1);
}
int cmd_rebase(int argc, const char **argv, const char *prefix)
{
struct rebase_options options = {
.type = REBASE_UNSPECIFIED,
.flags = REBASE_NO_QUIET,
.git_am_opt = STRBUF_INIT,
.allow_rerere_autoupdate = -1,
.allow_empty_message = 1,
.git_format_patch_opt = STRBUF_INIT,
};
const char *branch_name;
int ret, flags, total_argc, in_progress = 0;
int ok_to_skip_pre_rebase = 0;
struct strbuf msg = STRBUF_INIT;
struct strbuf revisions = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
struct object_id merge_base;
enum {
NO_ACTION,
ACTION_CONTINUE,
ACTION_SKIP,
ACTION_ABORT,
ACTION_QUIT,
ACTION_EDIT_TODO,
ACTION_SHOW_CURRENT_PATCH,
} action = NO_ACTION;
int committer_date_is_author_date = 0;
int ignore_date = 0;
int ignore_whitespace = 0;
const char *gpg_sign = NULL;
int opt_c = -1;
struct string_list whitespace = STRING_LIST_INIT_NODUP;
struct string_list exec = STRING_LIST_INIT_NODUP;
const char *rebase_merges = NULL;
int fork_point = -1;
struct string_list strategy_options = STRING_LIST_INIT_NODUP;
struct object_id squash_onto;
char *squash_onto_name = NULL;
struct option builtin_rebase_options[] = {
OPT_STRING(0, "onto", &options.onto_name,
N_("revision"),
N_("rebase onto given branch instead of upstream")),
OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
N_("allow pre-rebase hook to run")),
OPT_NEGBIT('q', "quiet", &options.flags,
N_("be quiet. implies --no-stat"),
REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
OPT_BIT('v', "verbose", &options.flags,
N_("display a diffstat of what changed upstream"),
REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
N_("do not show diffstat of what changed upstream"),
PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
N_("passed to 'git apply'")),
OPT_BOOL(0, "signoff", &options.signoff,
N_("add a Signed-off-by: line to each commit")),
OPT_BOOL(0, "committer-date-is-author-date",
&committer_date_is_author_date,
N_("passed to 'git am'")),
OPT_BOOL(0, "ignore-date", &ignore_date,
N_("passed to 'git am'")),
OPT_BIT('f', "force-rebase", &options.flags,
N_("cherry-pick all commits, even if unchanged"),
REBASE_FORCE),
OPT_BIT(0, "no-ff", &options.flags,
N_("cherry-pick all commits, even if unchanged"),
REBASE_FORCE),
OPT_CMDMODE(0, "continue", &action, N_("continue"),
ACTION_CONTINUE),