Release 20.2.4

[pradyunsg]

set -e

git cherry-pick -m 1 955daa9 # Architecture Documentation: CLI deep dive #7859
git cherry-pick -m 1 a13f201 # Update Caching documentation #8780
git cherry-pick -m 1 7fdf163 # Reformat a few spots in user guide #8795
git cherry-pick -m 1 0321dbc # Add ux docs to pip documentation #8807
git cherry-pick -m 1 e61bb61 # Pick up hashes from contraints files and intersect #8839
git cherry-pick -m 1 e408f70 # Document fast-track deprecation policy #8873
git cherry-pick -m 1 703d6ac # Cache found candidates #8912
# <handle conflicts>
git cherry-pick -m 1 428a790 # New resolver try user requested combinations first #8924
git cherry-pick -m 1 a3da6b2 # Don't crash on 'check' when METADATA is missing #8926
git cherry-pick -m 1 b98cf9c # Document Python support policy #8927
git cherry-pick -m 1 a4d3441 # Update docs index page about resolver and UX work #8933
git cherry-pick -m 1 a0f2f2c # docs: Add how to default to new resolver #8942
git cherry-pick -m 1 567630b # Include Requires-Python dep even with --no-deps #8758
# <handle conflicts>
git cherry-pick -m 1 3fe826c # Implement "lazy sequence" to avoid Internet access during candidate search #8932
# <handle conflicts>

nox -s prepare-release -- 20.2.4

Running tests locally on the actual release artifacts, since I don't feel that sure about this given how much the codebase has diverged.

[pradyunsg]

Running tests locally on the actual release artifacts, since I don't be that sure about this.

Other than an hg test that failed coz bitbucket is down, all is well.

[pradyunsg]

Sleep time. Will merge + upload tomorrow.

[pradyunsg]

Gonna redo this a bit and include #8932 into this.

[pypa-bot]

Hello!

I am an automated bot and I have noticed that this pull request is not currently able to be merged. If you are able to either merge the master branch into this pull request or rebase this pull request against master then it will eligible for code review and hopefully merging!

[pradyunsg]

Ok CI -- once you pass, then I'll do all the releasy bits before I head to sleep. We're doing a Friday release this time. :3

And, I know there's merge conflicts right now -- the plan is to merge in master to this branch and drop the news fragments and then merge back in. It'll all work -- see ec3b313.

[pradyunsg]

Of course, the CI doesn't want to run when there's merge conflicts. Please don't mind that temporary tag that's gonna go away soon. >.<

[pradyunsg]

Let's try this again.

[pradyunsg]

Okay -- one test fails on the release tag, when run locally:

E           pip._internal.exceptions.SubProcessError: Command errored out with exit status 255: hg clone --noupdate -q http://bitbucket.org/runeh/anyjson /private/var/folders/4d/bt0_xfx56bjfmmt2bv3r5_qh0000gn/T/pytest-of-pradyunsg/pytest-9/popen-gw2/test_install_global_option_usi0/cache/anyjson Check the logs for full command output.

I'm gonna say we're good, coz that's because it's an external thing which has changed (BitBucket's Mercurial support).