Tests depend on Bitbucket Mercurial support (sunsetting June 1, 2020)

[cjerdonek]

Some of pip's tests depend on Bitbucket support for Mercurial, which sunsets June 1, 2020: https://bitbucket.org/blog/sunsetting-mercurial-support-in-bitbucket

Here is one such test:

pip/tests/functional/test_install.py

Lines 666 to 675 in 084d797

	@need_mercurial
	def test_install_global_option_using_editable(script, tmpdir):
	"""
	Test using global distutils options, but in an editable installation
	"""
	url = 'hg+http://bitbucket.org/runeh/anyjson'
	result = script.pip(
	'install', '--global-option=--version', '-e',
	'%s@0.2.5#egg=anyjson' % local_checkout(url, tmpdir.joinpath("cache")),
	expect_stderr=True)

(Also, external repos that pip's tests depend on should probably be under the PyPA organization.)

[pradyunsg]

Nice catch! What can we depend on for networked mercurial tests?

[cjerdonek]

I was thinking about this, and one possibility would simply be to use the hg command to construct a Mercurial repo "on the fly." For example, if it's okay for the repo to have one commit, it could check out a commit from a Git repo, and then commit it as the first commit of an hg repo. Or if the repo is simple enough, we wouldn't even need to fetch from an external source -- we could just store or construct the repo's files from data in the pip repo. With either of the above approaches, we don't need to depend on an external Mercurial hosting service. This approach would only let us test repos hosted on the same file system (e.g. file:// protocol), but that might be sufficient for our purposes.

[cjerdonek]

This is similar to (but not quite the same as) an approach used in one place in our test suite, which is to construct an svn repo from a "dump" file stored in an hg repo using code stored in git :)

pip/tests/lib/local_repos.py

Lines 21 to 33 in c9a90fd

	def _dump_initools_repository(directory):
	filename, _ = urllib_request.urlretrieve(
	'http://bitbucket.org/hltbra/pip-initools-dump/raw/8b55c908a320/'
	'INITools_modified.dump'
	)
	initools_folder = os.path.join(directory, 'INITools')
	devnull = open(os.devnull, 'w')
	dump = open(filename)
	subprocess.check_call(
	['svnadmin', 'load', initools_folder],
	stdin=dump,
	stdout=devnull,
	)

(That process can certainly be simplified a bit.)

[pradyunsg]

Right, that'd be a local hg repository. I guess it doesn't matter whether we're interacting with a local repository vs a remote one?

I'm on board for this plan. :)