easy_install: use --depth 1 with git clone when downloading requirements

[ubunatic]

Currently, when fetching requirements via git, easy_install fetches the complete git history. This can take very long for large repos.

To fix this, we can use --depth 1 when doing git clone and subsequently do a git fetch --depth 1 origin <rev> to download a specific revision.

I already prepared a branch to fix this, and I am preparing a PR just now (following the PR instructions).

I tested my branch already with a private repo using

• python3.6 -m easy_install --user -v git+ssh://[email protected]/private/repo.git@master
• python3.6 -m easy_install --user -v git+ssh://[email protected]/private/repo.git

to check the rev is None and rev is not None code-paths.

[benoit-pierre]

easy_install is deprecated, use pip. Cloning with --depth 1 would break git describe, which could be problematic in some cases, see discussion on pip's tracker.

[ubunatic]

OK. I thought we need to fix this in pip and here too. I will close the PR and read how this works in pip.