pip install scheme `git+http` fails on Cygwin due to invalid clone destination-path

[ankostis]

• Pip version: pip 9.0.1
• Python version: 3.6, 3.5 (https://winpython.github.io/)
• Operating system: Windows
• cygwin-git: 2.14.2

Description:

pip install git+http shceme has stopped working after Cygwin64 upgraded git to 2.8.3+ with invalid path.
See also discussion in Git mailing-list: http://lists-archives.com/git/894111-cygwin-git-cannot-install-python-packages-with-pip.html

What I've run:

With cygdrive installed in D:\cygwin64\, i get the following error:

@host(cygwin):~$export GIT_TRACE=2
@host(cygwin):~$pip install git+https://github.com/redacted/XKCD-password-generator
Collecting git+https://github.com/redacted/XKCD-password-generator
  Cloning https://github.com/redacted/XKCD-password-generator to d:\apps\cygwin64\tmp\pip-8yv12z7t-build
00:03:26.171602 git.c:340               trace: built-in: git 'clone' '-q' 'https://github.com/redacted/XKCD-password-generator' 'D:\cygwin64\tmp\pip-8yv12z7t-build'
fatal: Invalid path '/cygdrive/d/cygwin64/home/user/D:\cygwin64\tmp\pip-8yv12z7t-build': No such file or directory
Command "git clone -q https://github.com/redacted/XKCD-password-generator D:\cygwin64\tmp\pip-8yv12z7t-build" failed with error code 128 in None

[ocervell]

Running into the same issue while trying to install from github repo: pip install git+https://github.com/mher/flower.git#egg=flower.

[ankostis]

This is a real blocker.
Would you, @maintainers, accept a Cygwin-detection PR?

[pfmoore]

I'm inclined to agree with the cygwin maintainers' view here - we don't support mixing of cygwin and non-cygwin executables in this way. You should either use a cygwin-built pip or a native git, and not mix the two.

[ankostis]

But in Windows the situation is always a bit chimerean :-)

You see, building numpy in MSYS's python-3 is not for the faint-hearted.
In Cygwin probably there are even more hurdles to have a functioning PyData python-3 environment.

In practice, everybody uses, either Conda, or the official pyton-for-windows (aka Gohlke's binaries or WinPython distribution), but certainly not the MSYS-python included with git.

[pradyunsg]

Closing due to a lack of activity.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.