git checkout of origin branch fails due to long pathname

[lrech]

• I was not able to find an open or closed issue matching what I'm seeing

Setup

$ git --version --build-options
git version 2.12.0.windows.1
built from commit: d4baef1cdfef9de62d43f9682a98ba57adc842e4
sizeof-long: 4
machine: x86_64

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?

$ cmd.exe /c ver

Microsoft Windows [Version 6.1.7601]

• What options did you set as part of the installation? Or did you choose the
  defaults?

# One of the following:
> type "C:\Program Files\Git\etc\install-options.txt"

Path Option: CmdTools
SSH Option: OpenSSH
CRLF Option: CRLFAlways
Bash Terminal Option: MinTTY
Performance Tweaks FSCache: Enabled
Use Credential Manager: Enabled
Enable Symlinks: Disabled

• Any other interesting things about your environment that might be related
  to the issue you're seeing?

A business decision was made at the beginning of the project to include all node_modules as part of the repository. We are also running an inhouse git server.

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

I am currently using PowerShell, but the error also occurs when using CMD, Git Bash and GitExtensions.

• What commands did you run to trigger this issue? If you can provide a

  If you don't mind I'm going to obscure our internal project name, I don't think it's relevant to outcome/reproducibility of the issue.

git clone ssh://server/path/to/repos/Project.git
cd .\Project
git checkout -b develop origin/develop

• What did you expect to occur after running these commands?

Expectation was to have a tracked local develop branch checked out.

• What actually happened instead?

The following error was reported:
$ > git co -b develop origin/develop
fatal: cannot create directory at 'ProjectMVC/node_modules/gulp-autoprefixer/node_modules/gulp-util/node_modules/dateformat/node_modules/meow/node_modules/normalize-package-data/node_modules/validate-npm-package-license/node_modules/spdx-correct/node_modules/spdx-license-ids': No such file or directory

It should be noted that we have "git config --global --add core.longpaths true" and that the checkout command above succeeds when using git version 2.9.2.windows.1

• If the problem was occurring with a specific repository, can you provide the
  URL to that repository to help us with testing?

As mentioned above, we are using an inhouse git server.

[red1939]

Have the same issue. git-svn fetch works, but when trying to checkout contents of commit (via git reset --hard) I get the "No such file or directory".

Windows 10 Redstone 1 (14393) x64
git version 2.12.0.windows.1

Path Option: BashOnly
SSH Option: OpenSSH
CRLF Option: CRLFAlways
Bash Terminal Option: MinTTY
Performance Tweaks FSCache: Enabled
Use Credential Manager: Enabled
Enable Symlinks: Enabled

[red1939]

I've debugged a little bit and the scenario is as follows:

1. Relative (input) path is of size 226
2. Full path prefix is of size 27
3. UTF 2 wide char succeeds mingw.h@xuftowcs_path_ex:623
4. Long path doesn't convert the path to UNC as we are both below 260 limit (253) and relative mingw.c@handle_long_path:2947
5. Unmodified path is passed to _wmkdir mingw.c@mingw_mkdir:502
6. _wmkdir fails (ret = -1), errno is ... 0, but get last error is set to 206 (ERROR_FILENAME_EXCED_RANGE)

Also I found a note that in case of paths, the max_path is not 260 (as the value itself) but 248. I proposed my change in #1088.