view tests/test-evolve-content-divergence.t @ 3846:f9dad99a90d5

evolve: create a new commit instead of amending one of the divergents

This patch changes the behavior of evolve command while resolving
content-divergence to create a new commit instead of amending one of the
divergent ones.

In past, I have made this change, backed out this change and now today again I
am doing this change, so let's dive in some history.

Using cmdrewrite.amend() was never a good option as that requires hack to delete
the evolvestate and also gives us less control over things. We can't make the
commit on top of different parents as that of content-divergent ones. Due to all
these, I first made this change to create a new commit instead of amending one.

But, after few days, there was flakiness observed in the tests and turned out
that we need to do some dirstate dance as repo.dirstate.setparents() does not
always fix the dirstate. That flakiness was a blocker for progress at that time
and we decided to switch to amend back so that we can have things working with
some hacks and we can later fix the implementation part.

Now, yesterday while tackling resolving content-divergence of a stack which is
as follows:

C1 C2
 | |
B1 B2
 | |
A1 A2
 \/
base

where, A1-A2, B1-B2, C1-C2 are content-divergent with each other. Now we can
resolve A1-A2 very well because they have the same parent and let's say that
resolution leads to A3.
Now, we want to resolve B1-B2 and make the new resolution commit on top of A3 so
that we can end up something like:

C3
 |
B3
 |
A3
 |
base

however, amending one of the divergent changesets, it's not possible to create a
commit on a different parent like A3 here without some relocation. We should
prevent relocation as that may leads to some conflicts and should change the
parent before committing.

So, looking ahead, we can't move with using amend as still using that we will
need some relocation hacks making code ugly and prone to bad behaviors, bugs.
Let's change back to creating a new commit so that we can move forward in a good
way.

About repo.dirstate.setparents() not setting the dirstate, I have researched
yesterday night about how we can do that and found out that we can use
cmdrewrite._uncommitdirstate() here. Expect upcoming patches to improve the
documentation of that function.

There are lot of test changes because of change in hash but there is no behavior
change. The only behavior change is in test-evolve-abort-contentdiv.t which is
nice because creating a new commit helps us in stripping that while aborting.
We have a lot of testing of content-divergence and no behavior change gives
enough confidence for making this change.

I reviewed the patch carefully to make sure there is no behavior change and I
suggest reviewer to do the same.

** Test for handling of content divergent changesets by `hg evolve` **
====================================================================

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

  $ hg init cdiv
  $ cd cdiv
  $ echo ".*\.orig" > .hgignore
  $ hg add .hgignore
  $ hg ci -m "added hgignore"
  $ for ch in a b c d; do echo foo > $ch; hg add $ch; hg ci -qm "added "$ch; done;

  $ hg glog
  @  4:c41c793e0ef1 added d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

Creating content-divergence with branch change where base, divergent and other
have different branches
-------------------------------------------------------------------------------

  $ hg branch -r . foobar
  changed branch on 1 changesets

  $ hg up c41c793e0ef1 --hidden
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset c41c793e0ef1
  (hidden revision 'c41c793e0ef1' was rewritten as: 9e5dffcb3d48)
  working directory parent is obsolete! (c41c793e0ef1)
  (use 'hg evolve' to update to its successor: 9e5dffcb3d48)
  $ echo bar > d
  $ hg branch watwat
  marked working directory as branch watwat
  $ hg amend
  2 new content-divergent changesets

  $ hg glog
  @  6:264b04f771fb added d
  |   () [watwat] draft
  | *  5:9e5dffcb3d48 added d
  |/    () [foobar] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent --config ui.interactive=True<<EOF
  > c
  > EOF
  merge:[6] added d
  with: [5] added d
  base: [4] added d
  merging "other" content-divergent changeset '9e5dffcb3d48'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  content divergent changesets on different branches.
  choose branch for the resolution changeset. (a) default or (b) watwat or (c) foobar?  c
  working directory is now at 0ac42f1bc15c

  $ hg glog
  @  7:0ac42f1bc15c added d
  |   () [foobar] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

Testing merging of commit messages
-----------------------------------

When base and one of the divergent has same commit messages and other divergent
has different one

  $ echo wat > d
  $ hg amend

  $ hg up .^
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo bar > d
  $ hg ci -Aqm "added a d with bar in it, expect some beers"

  $ hg prune -r 0ac42f1bc15c -s . --hidden
  1 changesets pruned
  2 new content-divergent changesets

  $ hg glog
  @  9:59081c9c425a added a d with bar in it, expect some beers
  |   () [default] draft
  | *  8:f621d00f5f0e added d
  |/    () [foobar] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[9] added a d with bar in it, expect some beers
  with: [8] added d
  base: [7] added d
  merging "other" content-divergent changeset 'f621d00f5f0e'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at a9d6fd6b5e40

  $ hg glog
  @  10:a9d6fd6b5e40 added a d with bar in it, expect some beers
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

When base has different message and both divergents has same one

  $ echo foo > d
  $ hg amend -m "foo to d"

  $ hg up a9d6fd6b5e40 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset a9d6fd6b5e40
  (hidden revision 'a9d6fd6b5e40' was rewritten as: b10b07a394f1)
  working directory parent is obsolete! (a9d6fd6b5e40)
  (use 'hg evolve' to update to its successor: b10b07a394f1)
  $ echo babar > d
  $ hg amend -m "foo to d"
  2 new content-divergent changesets

  $ hg glog
  @  12:0bb497fed24a foo to d
  |   () [default] draft
  | *  11:b10b07a394f1 foo to d
  |/    () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[12] foo to d
  with: [11] foo to d
  base: [10] added a d with bar in it, expect some beers
  merging "other" content-divergent changeset 'b10b07a394f1'
  merging d
  warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  abort: fix conflicts and see `hg help evolve.interrupted`
  [255]

  $ echo foobar > d
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve --continue
  working directory is now at 11175423b5dc

  $ hg glog
  @  13:11175423b5dc foo to d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

When all three base, divergent and other has different commit messages creating
conflicts

  $ echo bar > d
  $ hg amend -m "bar to d, expect beers"

  $ hg up 11175423b5dc --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 11175423b5dc
  (hidden revision '11175423b5dc' was rewritten as: 27f0463f169a)
  working directory parent is obsolete! (11175423b5dc)
  (use 'hg evolve' to update to its successor: 27f0463f169a)
  $ echo wat > d
  $ hg amend -m "wat to d, wat?"
  2 new content-divergent changesets

  $ hg glog
  @  15:f542037ddf31 wat to d, wat?
  |   () [default] draft
  | *  14:27f0463f169a bar to d, expect beers
  |/    () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[15] wat to d, wat?
  with: [14] bar to d, expect beers
  base: [13] foo to d
  merging "other" content-divergent changeset '27f0463f169a'
  merging d
  warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  abort: fix conflicts and see `hg help evolve.interrupted`
  [255]

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

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > printf "**showing editors text**\n\n"
  > cat \$1
  > printf "\n**done showing editors text**\n\n"
  > cat > \$1 <<ENDOF
  > watbar to d
  > ENDOF
  > EOF

  $ HGEDITOR='sh ./editor.sh' hg evolve --continue
  **showing editors text**
  
  HG: Conflicts while merging changeset description of content-divergent changesets.
  HG: Resolve conflicts in commit messages to continue.
  
  <<<<<<< divergent
  wat to d, wat?||||||| base
  foo to d=======
  bar to d, expect beers>>>>>>> other
  
  **done showing editors text**
  
  working directory is now at 89ea3eee2d69

  $ hg glog
  @  16:89ea3eee2d69 watbar to d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ cd ..

Testing resolution of content-divergent changesets when they are on different
parents and resolution and relocation wont result in conflicts
------------------------------------------------------------------------------

  $ hg init multiparents
  $ cd multiparents
  $ echo ".*\.orig" > .hgignore
  $ hg add .hgignore
  $ hg ci -m "added hgignore"
  $ for ch in a b c d; do echo foo > $ch; hg add $ch; hg ci -qm "added "$ch; done;

  $ hg glog
  @  4:c41c793e0ef1 added d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg up .^^
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo bar > b
  $ hg amend
  2 new orphan changesets

  $ hg rebase -r b1661037fa25 -d 8fa14d15e168 --hidden --config experimental.evolution.allowdivergence=True
  rebasing 2:b1661037fa25 "added b"
  2 new content-divergent changesets

  $ hg glog
  *  6:da4b96f4a8d6 added b
  |   () [default] draft
  | @  5:7ed0642d644b added b
  | |   () [default] draft
  | | *  4:c41c793e0ef1 added d
  | | |   () [default] draft
  | | *  3:ca1b80f7960a added c
  | | |   () [default] draft
  | | x  2:b1661037fa25 added b
  | |/    () [default] draft
  | o  1:c7586e2a9264 added a
  |/    () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[5] added b
  with: [6] added b
  base: [2] added b
  rebasing "other" content-divergent changeset da4b96f4a8d6 on c7586e2a9264
  updating to "local" side of the conflict: 7ed0642d644b
  merging "other" content-divergent changeset '11f849d7159f'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at 171614c9a791

  $ hg glog
  @  8:171614c9a791 added b
  |   () [default] draft
  | *  4:c41c793e0ef1 added d
  | |   () [default] draft
  | *  3:ca1b80f7960a added c
  | |   () [default] draft
  | x  2:b1661037fa25 added b
  |/    () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 171614c9a7914c53f531373b95632323fdbbac8d
  # Parent  c7586e2a92645e473645847a7b69a6dc52be4276
  added b
  
  diff -r c7586e2a9264 -r 171614c9a791 b
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/b	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +bar

Resolving orphans to get back to a normal graph

  $ hg evolve --all
  move:[3] added c
  atop:[8] added b
  move:[4] added d
  atop:[9] added c
  working directory is now at 4ae4427ee9f8
  $ hg glog
  @  10:4ae4427ee9f8 added d
  |   () [default] draft
  o  9:917281f93fcb added c
  |   () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

More testing!

  $ hg up .^^
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo x > x
  $ hg ci -Aqm "added x"
  $ hg glog -r .
  @  11:71a392c714b5 added x
  |   () [default] draft
  ~

  $ echo foo > x
  $ hg branch bar
  marked working directory as branch bar
  (branches are permanent and global, did you want a bookmark?)
  $ hg amend -m "added foo to x"

  $ hg up 71a392c714b5 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 71a392c714b5
  (hidden revision '71a392c714b5' was rewritten as: 1e1a50385a7d)
  working directory parent is obsolete! (71a392c714b5)
  (use 'hg evolve' to update to its successor: 1e1a50385a7d)
  $ hg rebase -r . -d 4ae4427ee9f8 --config experimental.evolution.allowdivergence=True
  rebasing 11:71a392c714b5 "added x"
  2 new content-divergent changesets

  $ hg glog
  @  13:1e4f6b3bb39b added x
  |   () [default] draft
  | *  12:1e1a50385a7d added foo to x
  | |   () [bar] draft
  o |  10:4ae4427ee9f8 added d
  | |   () [default] draft
  o |  9:917281f93fcb added c
  |/    () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[13] added x
  with: [12] added foo to x
  base: [11] added x
  rebasing "other" content-divergent changeset 1e1a50385a7d on 4ae4427ee9f8
  updating to "local" side of the conflict: 1e4f6b3bb39b
  merging "other" content-divergent changeset '80cc9b1ec650'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at b006cf317e0e

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Branch bar
  # Node ID b006cf317e0ed16dbe786c439577475580f645f1
  # Parent  4ae4427ee9f8f0935211fd66360948b77ab5aee9
  added foo to x
  
  diff -r 4ae4427ee9f8 -r b006cf317e0e x
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/x	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +foo

The above `hg exp` and the following log call demonstrates that message, content
and branch change is preserved in case of relocation
  $ hg glog
  @  15:b006cf317e0e added foo to x
  |   () [bar] draft
  o  10:4ae4427ee9f8 added d
  |   () [default] draft
  o  9:917281f93fcb added c
  |   () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

Testing when both the content-divergence are on different parents and resolution
will lead to conflicts
---------------------------------------------------------------------------------

  $ hg up .^^^
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved

  $ echo y > y
  $ hg ci -Aqm "added y"
  $ hg glog -r .
  @  16:fc6ad2bac162 added y
  |   () [default] draft
  ~

  $ echo bar > y
  $ hg amend

  $ hg up fc6ad2bac162 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset fc6ad2bac162
  (hidden revision 'fc6ad2bac162' was rewritten as: 2a9f6ccbdeba)
  working directory parent is obsolete! (fc6ad2bac162)
  (use 'hg evolve' to update to its successor: 2a9f6ccbdeba)
  $ hg rebase -r . -d b006cf317e0e --config experimental.evolution.allowdivergence=True
  rebasing 16:fc6ad2bac162 "added y"
  2 new content-divergent changesets
  $ echo wat > y
  $ hg amend

  $ hg glog
  @  19:b4575ed6fcfc added y
  |   () [bar] draft
  | *  17:2a9f6ccbdeba added y
  | |   () [default] draft
  o |  15:b006cf317e0e added foo to x
  | |   () [bar] draft
  o |  10:4ae4427ee9f8 added d
  | |   () [default] draft
  o |  9:917281f93fcb added c
  |/    () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[19] added y
  with: [17] added y
  base: [16] added y
  rebasing "other" content-divergent changeset 2a9f6ccbdeba on b006cf317e0e
  updating to "local" side of the conflict: b4575ed6fcfc
  merging "other" content-divergent changeset '48f745db3f53'
  merging y
  warning: conflicts while merging y! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  abort: fix conflicts and see `hg help evolve.interrupted`
  [255]

  $ echo watbar > y
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve --continue
  working directory is now at 7bbcf24ddecf

  $ hg glog
  @  21:7bbcf24ddecf added y
  |   () [bar] draft
  o  15:b006cf317e0e added foo to x
  |   () [bar] draft
  o  10:4ae4427ee9f8 added d
  |   () [default] draft
  o  9:917281f93fcb added c
  |   () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg obslog -r . --all
  @    7bbcf24ddecf (21) added y
  |\
  x |  48f745db3f53 (20) added y
  | |    rewritten(branch, content) as 7bbcf24ddecf using evolve by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  | x  b4575ed6fcfc (19) added y
  | |    rewritten(content) as 7bbcf24ddecf using evolve by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  x |  2a9f6ccbdeba (17) added y
  | |    rewritten(parent) as 48f745db3f53 using evolve by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  | x  96b677f01b81 (18) added y
  |/     rewritten(content) as b4575ed6fcfc using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  fc6ad2bac162 (16) added y
       rewritten(content) as 2a9f6ccbdeba using amend by test (Thu Jan 01 00:00:00 1970 +0000)
       rewritten(branch, parent) as 96b677f01b81 using rebase by test (Thu Jan 01 00:00:00 1970 +0000)
  

checking that relocated commit is there
  $ hg exp 48f745db3f53 --hidden
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 48f745db3f5300363ca248b9aeab20ff2a55fbb3
  # Parent  b006cf317e0ed16dbe786c439577475580f645f1
  added y
  
  diff -r b006cf317e0e -r 48f745db3f53 y
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/y	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +bar

Testing when the relocation will result in conflicts and merging wont
----------------------------------------------------------------------

  $ hg glog
  @  21:7bbcf24ddecf added y
  |   () [bar] draft
  o  15:b006cf317e0e added foo to x
  |   () [bar] draft
  o  10:4ae4427ee9f8 added d
  |   () [default] draft
  o  9:917281f93fcb added c
  |   () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg up .^^^^
  0 files updated, 0 files merged, 4 files removed, 0 files unresolved

  $ echo z > z
  $ hg ci -Aqm "added z"
  $ hg glog -r .
  @  22:daf1de08f3b0 added z
  |   () [default] draft
  ~

  $ echo foo > y
  $ hg add y
  $ hg amend

  $ hg up daf1de08f3b0 --hidden
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  updated to hidden changeset daf1de08f3b0
  (hidden revision 'daf1de08f3b0' was rewritten as: 3f7a1f693080)
  working directory parent is obsolete! (daf1de08f3b0)
  (use 'hg evolve' to update to its successor: 3f7a1f693080)
  $ hg rebase -r . -d 7bbcf24ddecf --config experimental.evolution.allowdivergence=True
  rebasing 22:daf1de08f3b0 "added z"
  2 new content-divergent changesets
  $ echo bar > z
  $ hg amend

  $ hg glog
  @  25:53242575ffa9 added z
  |   () [bar] draft
  | *  23:3f7a1f693080 added z
  | |   () [default] draft
  o |  21:7bbcf24ddecf added y
  | |   () [bar] draft
  o |  15:b006cf317e0e added foo to x
  | |   () [bar] draft
  o |  10:4ae4427ee9f8 added d
  | |   () [default] draft
  o |  9:917281f93fcb added c
  |/    () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[25] added z
  with: [23] added z
  base: [22] added z
  rebasing "other" content-divergent changeset 3f7a1f693080 on 7bbcf24ddecf
  merging y
  warning: conflicts while merging y! (edit, then use 'hg resolve --mark')
  abort: unresolved merge conflicts (see hg help resolve)
  [255]

  $ hg diff
  diff -r 7bbcf24ddecf y
  --- a/y	Thu Jan 01 00:00:00 1970 +0000
  +++ b/y	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,5 @@
  +<<<<<<< destination: 7bbcf24ddecf bar - test: added y
   watbar
  +=======
  +foo
  +>>>>>>> evolving:    3f7a1f693080 - test: added z
  diff -r 7bbcf24ddecf z
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/z	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +z

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

  $ hg evolve --continue
  working directory is now at 10c9f94f1e99

  $ hg glog
  @  26:10c9f94f1e99 added z
  |   () [default] draft
  o  21:7bbcf24ddecf added y
  |   () [bar] draft
  o  15:b006cf317e0e added foo to x
  |   () [bar] draft
  o  10:4ae4427ee9f8 added d
  |   () [default] draft
  o  9:917281f93fcb added c
  |   () [default] draft
  o  8:171614c9a791 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

XXX: z should have bar inside, the merge definitely did not happen
  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 10c9f94f1e9902d905b22019d711d31f3642f589
  # Parent  7bbcf24ddecfe97d7c2ac6fa8c07c155c8fda47b
  added z
  
  diff -r 7bbcf24ddecf -r 10c9f94f1e99 y
  --- a/y	Thu Jan 01 00:00:00 1970 +0000
  +++ b/y	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,1 @@
  -watbar
  +foo
  diff -r 7bbcf24ddecf -r 10c9f94f1e99 z
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/z	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +z

  $ cd ..

Resolving content-divergence of a stack with same parents
---------------------------------------------------------

  $ hg init stacktest
  $ cd stacktest
  $ echo ".*\.orig" > .hgignore
  $ hg add .hgignore
  $ hg ci -m "added hgignore"
  $ for ch in a b c d; do echo foo > $ch; hg add $ch; hg ci -qm "added "$ch; done;

  $ hg glog
  @  4:c41c793e0ef1 added d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ cd ..
  $ hg init stack2
  $ cd stack2
  $ hg pull ../stacktest
  pulling from ../stacktest
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 5 files
  new changesets 8fa14d15e168:c41c793e0ef1
  (run 'hg update' to get a working copy)
  $ hg glog
  o  4:c41c793e0ef1 added d
  |   () [default] draft
  o  3:ca1b80f7960a added c
  |   () [default] draft
  o  2:b1661037fa25 added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg up c7586e2a9264
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo bar > a
  $ hg amend -m "watbar to a"
  3 new orphan changesets
  $ hg evolve --all
  move:[2] added b
  atop:[5] watbar to a
  move:[3] added c
  atop:[6] added b
  move:[4] added d
  atop:[7] added c
  working directory is now at 513e3267034e
  $ hg glog
  @  8:513e3267034e added d
  |   () [default] draft
  o  7:accb7a2b6ae9 added c
  |   () [default] draft
  o  6:60280764eb0e added b
  |   () [default] draft
  o  5:2587cb3ef1fe watbar to a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ cd ../stacktest
  $ hg up .^^^
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ echo wat > a
  $ hg amend -m "watbar to a"
  3 new orphan changesets
  $ hg evolve --all
  move:[2] added b
  atop:[5] watbar to a
  move:[3] added c
  atop:[6] added b
  move:[4] added d
  atop:[7] added c
  working directory is now at c72d2885eb51
  $ hg glog
  @  8:c72d2885eb51 added d
  |   () [default] draft
  o  7:3ce4be6d8e5e added c
  |   () [default] draft
  o  6:d5f148423c16 added b
  |   () [default] draft
  o  5:8e222f257bbf watbar to a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg pull ../stack2
  pulling from ../stack2
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 1 changes to 4 files (+1 heads)
  4 new obsolescence markers
  8 new content-divergent changesets
  new changesets 2587cb3ef1fe:513e3267034e
  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg glog
  *  12:513e3267034e added d
  |   () [default] draft
  *  11:accb7a2b6ae9 added c
  |   () [default] draft
  *  10:60280764eb0e added b
  |   () [default] draft
  *  9:2587cb3ef1fe watbar to a
  |   () [default] draft
  | @  8:c72d2885eb51 added d
  | |   () [default] draft
  | *  7:3ce4be6d8e5e added c
  | |   () [default] draft
  | *  6:d5f148423c16 added b
  | |   () [default] draft
  | *  5:8e222f257bbf watbar to a
  |/    () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

XXX: we are not resolving divergence in the correct order here
  $ hg evolve --all --content-divergent
  merge:[5] watbar to a
  with: [9] watbar to a
  base: [1] added a
  updating to "local" side of the conflict: 8e222f257bbf
  merging "other" content-divergent changeset '2587cb3ef1fe'
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  abort: fix conflicts and see `hg help evolve.interrupted`
  [255]

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

  $ hg evolve --continue
  6 new orphan changesets
  skipping d5f148423c16: have a different parent than 60280764eb0e (not handled yet)
  | d5f148423c16, 60280764eb0e are not based on the same changeset.
  | With the current state of its implementation, 
  | evolve does not work in that case.
  | rebase one of them next to the other and run 
  | this command again.
  | - either: hg rebase --dest 'p1(d5f148423c16)' -r 60280764eb0e
  | - or:     hg rebase --dest 'p1(60280764eb0e)' -r d5f148423c16
  skipping 3ce4be6d8e5e: have a different parent than accb7a2b6ae9 (not handled yet)
  | 3ce4be6d8e5e, accb7a2b6ae9 are not based on the same changeset.
  | With the current state of its implementation, 
  | evolve does not work in that case.
  | rebase one of them next to the other and run 
  | this command again.
  | - either: hg rebase --dest 'p1(3ce4be6d8e5e)' -r accb7a2b6ae9
  | - or:     hg rebase --dest 'p1(accb7a2b6ae9)' -r 3ce4be6d8e5e
  skipping c72d2885eb51: have a different parent than 513e3267034e (not handled yet)
  | c72d2885eb51, 513e3267034e are not based on the same changeset.
  | With the current state of its implementation, 
  | evolve does not work in that case.
  | rebase one of them next to the other and run 
  | this command again.
  | - either: hg rebase --dest 'p1(c72d2885eb51)' -r 513e3267034e
  | - or:     hg rebase --dest 'p1(513e3267034e)' -r c72d2885eb51
  working directory is now at b9f381e183a3

  $ hg glog
  @  13:b9f381e183a3 watbar to a
  |   () [default] draft
  | *  12:513e3267034e added d
  | |   () [default] draft
  | *  11:accb7a2b6ae9 added c
  | |   () [default] draft
  | *  10:60280764eb0e added b
  | |   () [default] draft
  | x  9:2587cb3ef1fe watbar to a
  |/    () [default] draft
  | *  8:c72d2885eb51 added d
  | |   () [default] draft
  | *  7:3ce4be6d8e5e added c
  | |   () [default] draft
  | *  6:d5f148423c16 added b
  | |   () [default] draft
  | x  5:8e222f257bbf watbar to a
  |/    () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft