datalad_next.patches.push_optimize

Make push avoid refspec handling for special remote push targets

This change introduces a replacement for core's push.py:_push() with a more intelligible flow. It replaces the stalled https://github.com/datalad/datalad/pull/6666

Importantly, it makes one behavior change, which is desirable IMHO. Instead of rejecting to git-push any refspec for a repo with a detached HEAD, it will attempt to push a git-annex branch for an AnnexRepo. The respective test that ensured this behavior beyond the particular conditions the original problem occurred in was adjusted accordingly.

All push tests from core are imported and executed to ensure proper functioning.

Summary of the original commits patching the core implementation.

• Consolidate publication dependency handling in one place

• Consolidate tracking of git-push-dryrun exec Make a failed attempt discriminable from no prior attempt.

• Factor out helper to determine refspecs-to-push for a target

• Consolidate more handling of git-pushed and make conditional on an actual git-remote target This change is breaking behavior, because previously a source repository without an active branch would have been rejected for a push attempt. However, this is a bit questionable, because the git-annex branch might well need a push.

• Simplify push-logic: no need for a fetch, if there is no git-push

• Factor out helper to sync a remote annex-branch

• Adjust test to constrain the evaluated conditions (replacement tests is included here) As per the reasoning recorded in datalad#1811 (comment) the test ensuring the continue fix of datalad#1811 is actually verifying a situation that is not fully desirable. It prevents pushing of thew 'git-annex' branch whenever a repo is on a detached HEAD. This change let's the test run on a plain Git repo, where there is indeed nothing to push in this case.