pip install -e from git branch is not correct when done from a freeze requirements file

[esplinr]

I want to install Django into Pip such that it tracks the 1.7.x branch from beta through release. This is possible with this command:

pip3 install -e  git://github.com/django/django.git@stable/1.7.x#egg=django

When I go into the Django checkout within my virtual env, git reports: "On branch stable-1.7". git pull functions correctly.

But pip3 freeze does not produce a correct requirements.txt:

pip3 freeze > requirements.txt

-e git://github.com/django/django.git@edaff9b0dffc9ad984671673214d671d84abe144#egg=Django-origin/stable/1.7.x

The git address hash in the address produced by freeze is to a specific commit on the 1.7.x branch. When I go into the Django checkout within my virtualenv, git reports: "HEAD detached at edaff9b". git pull does not see any newer changes because "You are not currently on a branch".

My environment:
Python 3.3, using a pyvenv virtual environment, and pip 1.5.4 installed with get-pip.py

My team mate is also seeing the behavior using Python 3.3 and virtualenv+pip installed through Homebrew.

I think this issue is related to #647.

[esplinr]

So the problem isn't just that it is not correctly saved in the requirements.txt. Even if I put the correct URL in the requirements.txt, it still installs a detached clone that does not track the branch.

This does not work correctly:

echo "-e  git://github.com/django/django.git@stable/1.7.x#egg=django" > requirements.txt
pip3 install -r requirements.txt

But this does:

pip3 install -e  git://github.com/django/django.git@stable/1.7.x#egg=django

I think the behavior of the two approaches to installation should be identical.

[cjerdonek]

See also this issue, which relates to slashes being in the second part of the egg name: #1083

[chozabu]

Just ran into a related issue myself, after running pip install -e git+git://github.com/chozabu/django-popolo/@represent#egg=popolo
pip freeze generated a different line - which failed to install the lib

manually replacing the line in my requirements.txt with -e git+git://github.com/chozabu/django-popolo/@represent#egg=popolo fixes my issue, but will probably be annoying to maintain

[dstufft]

I'm going to close this as a duplicate of #2037 (because that issue also has a PR waiting to be reviewed to fix it).