view tests/test-evolve-orphan-merge.t @ 3529:d90e0faaec80

evolve: fix stabilization of orphan merge changesets in case of conflicts

As demonstrated by tests added in previous patch, if one of the parent of a
merge changeset has a new version and merge changeset gets, running `hg evolve`
to stabilize that if results in conflicts will lead to lose of other parent of
that merge changeset when we resolve conflicts and do `hg evolve --continue`.

This patch fixes the behavior, by checking whether we are continuing evolving a
merge changeset and if yes, setting the dirstate parents according to that.

** Testing resolution of orphans by `hg evolve` when merges are involved **

  $ cat >> $HGRCPATH <<EOF
  > [ui]
  > interactive = True
  > [alias]
  > glog = log -GT "{rev}:{node|short} {desc}\n ({bookmarks}) {phase}"
  > [extensions]
  > rebase =
  > EOF
  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH

Repo Setup

  $ hg init repo
  $ cd repo
  $ echo ".*\.orig" > .hgignore
  $ hg add .hgignore
  $ hg ci -m "added hgignore"

An orphan merge changeset with one of the parent obsoleted
==========================================================

1) When merging both the parents does not result in conflicts
-------------------------------------------------------------

  $ echo foo > a
  $ hg ci -Aqm "added a"
  $ hg up .^
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo foo > b
  $ hg ci -Aqm "added b"
  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m "merging a and b"

  $ hg glog
  @    3:3b2b6f4652ee merging a and b
  |\    () draft
  | o  2:d76850646258 added b
  | |   () draft
  o |  1:c7586e2a9264 added a
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

Testing with obsoleting the second parent

  $ hg up d76850646258
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo bar > b
  $ hg amend
  1 new orphan changesets

  $ hg glog
  @  4:64370c9805e7 added b
  |   () draft
  | *    3:3b2b6f4652ee merging a and b
  | |\    () draft
  +---x  2:d76850646258 added b
  | |     () draft
  | o  1:c7586e2a9264 added a
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg evolve --all
  move:[3] merging a and b
  atop:[4] added b
  working directory is now at 91fd62122a4b

  $ hg glog
  @    5:91fd62122a4b merging a and b
  |\    () draft
  | o  4:64370c9805e7 added b
  | |   () draft
  o |  1:c7586e2a9264 added a
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg parents
  changeset:   5:91fd62122a4b
  tag:         tip
  parent:      4:64370c9805e7
  parent:      1:c7586e2a9264
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merging a and b
  

Testing with obsoleting the first parent

  $ hg up c7586e2a9264
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo bar > a
  $ hg amend
  1 new orphan changesets

  $ hg glog
  @  6:3d41537b44ca added a
  |   () draft
  | *    5:91fd62122a4b merging a and b
  | |\    () draft
  +---o  4:64370c9805e7 added b
  | |     () draft
  | x  1:c7586e2a9264 added a
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg evolve --all
  move:[5] merging a and b
  atop:[6] added a
  working directory is now at 968d205ba4d8

  $ hg glog
  @    7:968d205ba4d8 merging a and b
  |\    () draft
  | o  6:3d41537b44ca added a
  | |   () draft
  o |  4:64370c9805e7 added b
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg parents
  changeset:   7:968d205ba4d8
  tag:         tip
  parent:      6:3d41537b44ca
  parent:      4:64370c9805e7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merging a and b
  
2) When merging both the parents resulted in conflicts
------------------------------------------------------

  $ hg up 8fa14d15e168
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo foo > c
  $ hg ci -Aqm "foo to c"
  $ hg prev
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  [0] added hgignore
  $ echo bar > c
  $ hg ci -Aqm "bar to c"

  $ hg glog
  @  9:d0f84b25d4e3 bar to c
  |   () draft
  | o  8:1c165c673853 foo to c
  |/    () draft
  | o    7:968d205ba4d8 merging a and b
  | |\    () draft
  +---o  6:3d41537b44ca added a
  | |     () draft
  | o  4:64370c9805e7 added b
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

Prune old test changesets to have clear graph view
  $ hg prune -r 64370c9805e7 -r 3d41537b44ca -r 968d205ba4d8
  3 changesets pruned

  $ hg glog
  @  9:d0f84b25d4e3 bar to c
  |   () draft
  | o  8:1c165c673853 foo to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg merge
  merging c
  warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ echo foobar > c
  $ hg resolve -m
  (no more unresolved files)
  $ hg ci -m "foobar to c"

  $ hg glog
  @    10:fd41d25a3e90 foobar to c
  |\    () draft
  | o  9:d0f84b25d4e3 bar to c
  | |   () draft
  o |  8:1c165c673853 foo to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

Testing with first parent obsoleted

  $ hg up 1c165c673853
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo FOO > c
  $ hg amend
  1 new orphan changesets

  $ hg glog
  @  11:31c317b7bdb1 foo to c
  |   () draft
  | *    10:fd41d25a3e90 foobar to c
  | |\    () draft
  +---o  9:d0f84b25d4e3 bar to c
  | |     () draft
  | x  8:1c165c673853 foo to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg evolve --all
  move:[10] foobar to c
  atop:[11] foo to c
  merging c
  warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
  evolve failed!
  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
  abort: unresolved merge conflicts (see hg help resolve)
  [255]

  $ echo FOObar > c
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve --continue
  evolving 10:fd41d25a3e90 "foobar to c"
  working directory is now at c5405d2da7a1

  $ hg glog
  @    12:c5405d2da7a1 foobar to c
  |\    () draft
  | o  11:31c317b7bdb1 foo to c
  | |   () draft
  o |  9:d0f84b25d4e3 bar to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg parents
  changeset:   12:c5405d2da7a1
  tag:         tip
  parent:      11:31c317b7bdb1
  parent:      9:d0f84b25d4e3
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foobar to c
  
Testing a conlficting merge with second parent obsoleted

  $ hg up 31c317b7bdb1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo foo > c
  $ hg amend
  1 new orphan changesets

  $ hg glog
  @  13:928097d0b5b5 foo to c
  |   () draft
  | *    12:c5405d2da7a1 foobar to c
  | |\    () draft
  +---x  11:31c317b7bdb1 foo to c
  | |     () draft
  | o  9:d0f84b25d4e3 bar to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft

  $ hg evolve --all
  move:[12] foobar to c
  atop:[13] foo to c
  merging c
  warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
  evolve failed!
  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
  abort: unresolved merge conflicts (see hg help resolve)
  [255]

  $ echo foobar > c
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue

  $ hg evolve --continue
  evolving 12:c5405d2da7a1 "foobar to c"
  working directory is now at dc1948a6eeab

  $ hg glog
  @    14:dc1948a6eeab foobar to c
  |\    () draft
  | o  13:928097d0b5b5 foo to c
  | |   () draft
  o |  9:d0f84b25d4e3 bar to c
  |/    () draft
  o  0:8fa14d15e168 added hgignore
      () draft