view tests/test-evolve-issue6648.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.

Finding split successors for the correct ancestor (issue6648)
https://bz.mercurial-scm.org/show_bug.cgi?id=6648

  $ . $TESTDIR/testlib/common.sh

  $ cat << EOF >> $HGRCPATH
  > [extensions]
  > evolve =
  > EOF

  $ hg init issue6648
  $ cd issue6648

  $ echo hi > foo
  $ hg commit -qAm 'r0'
  $ echo foo >> foo
  $ echo foo >> foosplit
  $ hg commit -qAm 'r1_splitme'
  $ echo bar > bar
  $ hg commit -qAm 'r2_obsoleteme'
  $ echo baz > baz
  $ hg commit -qAm 'r3'

  $ hg prune -r 2
  1 changesets pruned
  1 new orphan changesets
  $ hg split -r 1 --no-interactive foosplit
  1 files updated, 0 files merged, 3 files removed, 0 files unresolved
  reverting foo
  adding foosplit
  created new head
  no more changes to split

  $ hg update -r 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory parent is obsolete! (5c9b6cf2edc5)
  (use 'hg evolve' to update to its parent successor)

  $ hg log -G
  o  changeset:   5:983ec6453b57
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     r1_splitme
  |
  o  changeset:   4:9ca7a4996099
  |  parent:      0:e9326971c0ba
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     r1_splitme
  |
  | *  changeset:   3:c1e686af368d
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  instability: orphan
  | |  summary:     r3
  | |
  | @  changeset:   2:5c9b6cf2edc5
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  obsolete:    pruned using prune
  | |  summary:     r2_obsoleteme
  | |
  | x  changeset:   1:acdff8eea54c
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    obsolete:    split using split as 4:9ca7a4996099, 5:983ec6453b57
  |    summary:     r1_splitme
  |
  o  changeset:   0:e9326971c0ba
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     r0
  

handling obsolete wdp works

  $ hg evolve
  update:[5] r1_splitme
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  working directory is now at 983ec6453b57

stabilizing the orphan works

  $ hg evolve
  move:[3] r3
  atop:[5] r1_splitme