view tests/test-push-checkheads-multi-topics-F3.t @ 6224:17ffdea0edbb stable

evolve: look for split successors of the correct ancestor (issue6648)

Consider two changesets, 1 and 2. 1 is split into two new changesets and 2 is
pruned. If we stand on 2 and call hg evolve, _singlesuccessor() will traverse
ancestors of wdp in search of a changeset with successors to update to (it will
be 1, which was split). In case of a split, select_split_successor() gets
control. The issue is this function didn't traverse ancestors, and instead
tried to look up successors of the original changeset (i.e. 2 in our case,
which was pruned).

We can make select_split_successor() aware of _singlesuccessor() logic by using
the changeset that actually has successors without traversing ancestors again.
It's done by storing that changeset in MultipleSuccessorsError exception.

====================================
Testing head checking code: Case E-3
====================================

Mercurial checks for the introduction of new heads on push. Evolution comes
into play to detect if existing branches on the server are being replaced by
some of the new one we push.

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

Category E: case involving changeset on multiple branch
TestCase 8: moving only part of the interleaved branch away, creating 2 heads

.. old-state:
..
.. * 2-changeset on topic Y
.. * 1-changeset on topic Z (between the two other)
..
.. new-state:
..
.. * 2-changeset on topic Y, on untouched, the other moved
.. * 1-changeset on topic Z (at the same location)
..
.. expected-result:
..
.. * push rejected
..
.. graph-summary:
..
..   C ø⇠◔ C' topic Y
..     | |
..   B ◔ |    topic Z
..     | |
..   A ◔ |    topic Y
..     |/
..     ●

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

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

  $ mkdir E1
  $ cd E1
  $ setuprepos
  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 . Y
  switching to topic Y
  changed topic on 1 changesets to "Y"
  $ hg strip --config extensions.strip= --hidden 'hidden()' # clean old A0
  saved backup bundle to $TESTTMP/E1/client/.hg/strip-backup/8aaa48160adc-19166392-backup.hg
  $ hg topic Z
  $ mkcommit B0
  active topic 'Z' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg topic Y
  $ mkcommit C0
  $ hg push
  pushing to $TESTTMP/E1/server
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 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
  $ hg topic Y
  marked working directory as topic: Y
  $ mkcommit C1
  $ hg debugobsolete `getid "desc(C0)" ` `getid "desc(C1)"`
  1 new obsolescence markers
  obsoleted 1 changesets
  $ hg log -G --hidden
  @  57530ca5eb24 (draft)[Y]: C1
  |
  | x  345721b128e8 (draft)[Y]: C0
  | |
  | o  e1494106e1ca (draft)[Z]: B0
  | |
  | o  f5cd873e2965 (draft)[Y]: A0
  |/
  o  1e4be0697311 (public): root
  

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

  $ hg push -r 'desc("C1")'
  pushing to $TESTTMP/E1/server
  searching for changes
  abort: push creates new remote head 57530ca5eb24 on branch 'default:Y'
  (merge or see 'hg help push' for details about pushing new heads)
  [20]

  $ cd ../..