view tests/test-single-head-obsolescence-topic-B5.t @ 5619:5673730db8d5 stable

evolve: clean merge state when content divergence resolution has no changes

This patch backs out b723805d7fe1, which only hid the problem.

Usually mergestate is cleared (or should be cleared) when creating a new
changeset, but sometimes there are situations when there's nothing to commit.

When solving content divergence resulted in no changes and no new changesets
were created, mergestate was left untouched. That's a problem because sometimes
mergestate contains files with conflicts that were already resolved by user,
and such mergestate only applies to the current wdir parent. Since evolve has
already dealt with the current wdir parent successfully when it reached this
code, this is a good place to clean the mergestate.

=========================================
Testing single head enforcement: Case A-1
=========================================

A repository is set to only accept a single head per name (typically named
branch). However, obsolete changesets can make this enforcement more
complicated, because they can be kept visible by other changeset on other
branch.

This case is part of a series of tests checking this behavior.

Category A: Involving obsolescence
TestCase 1: obsoleting a merge reveal two heads

.. old-state:
..
.. * 3 changeset changeset on topic X (2 on their own branch + 1 merge)
.. * 1 changeset on topic Y (children of the merge)
..
.. new-state:
..
.. * 2 changeset changeset on topic X (merge is obsolete) each a head
.. * 1 changeset on topic Y keeping the merge visible
..
.. expected-result:
..
.. * 2 heads detected (because we skip the merge).
..
.. graph-summary:
..
..   D ●      (topic-Y)
..     |
..   C ●      (topic-Y)
..     |
..   M ⊗      (topic-X)
..     |\
..   A ● ● B  (topic-X)
..     |/
..     ●

  $ . $TESTDIR/testlib/topic_setup.sh
  $ . $TESTDIR/testlib/push-checkheads-util.sh

Test setup
----------

  $ mkdir B5
  $ cd B5
  $ setuprepos single-head
  creating basic server and client repo
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd client
  $ hg topic -r . topic-X
  switching to topic topic-X
  changed topic on 1 changesets to "topic-X"
  $ hg strip --config extensions.strip= --hidden 'hidden()' --no-backup # clean old A0
  $ hg up 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg topic topic-X
  marked working directory as topic: topic-X
  $ mkcommit B0
  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m 'M0'
  $ hg topic topic-Y
  $ mkcommit C0
  active topic 'topic-Y' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg push --new-branch
  pushing to $TESTTMP/B5/server
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 2 changes to 3 files (+1 heads)
  1 new obsolescence markers
  obsoleted 1 changesets
  $ hg up 0
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ mkcommit A1
  $ mkcommit B1
  $ hg debugobsolete `getid "desc(M0)"` --record-parents
  1 new obsolescence markers
  obsoleted 1 changesets
  1 new orphan changesets
  $ hg log -G --hidden
  @  262c8c798096 [default] (draft): B1
  |
  o  f6082bc4ffef [default] (draft): A1
  |
  | *  339fd31549ed [default:topic-Y] (draft): C0
  | |
  | x    33b3d4185449 [default:topic-X] (draft): M0
  | |\
  +---o  d3826ff42cf7 [default:topic-X] (draft): B0
  | |
  | o  5a47a98cd8e5 [default:topic-X] (draft): A0
  |/
  o  1e4be0697311 [default] (public): root
  

Actual testing
--------------

(force push to make sure we get the changeset on the remote)

  $ hg push -r 'desc("C0")' --force
  pushing to $TESTTMP/B5/server
  searching for changes
  no changes found
  transaction abort!
  rollback completed
  abort: rejecting multiple heads on branch "default:topic-X"
  (2 heads: 5a47a98cd8e5 d3826ff42cf7)
  [255]