annotate tests/test-evolve-content-divergence.t @ 3824:a8f509981d30

evolve: factor out logic for --stop flag in separate function

This will make code clean

** 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}"
  > [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  working directory parent is obsolete!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 23a4467c278e

  $ hg glog
  @  7:23a4467c278e 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 23a4467c278e -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
  | *  8:36618f77f252 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 '36618f77f252'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at ca80aeaf4ee8

  $ hg glog
  @  10:ca80aeaf4ee8 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 ca80aeaf4ee8 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset ca80aeaf4ee8
  (hidden revision 'ca80aeaf4ee8' was rewritten as: eba0b02801cb)
  working directory parent is obsolete! (ca80aeaf4ee8)
  (use 'hg evolve' to update to its successor: eba0b02801cb)
  $ echo babar > d
  $ hg amend -m "foo to d"
  2 new content-divergent changesets

  $ hg glog
  @  12:0116315a1a4a foo to d
  |   () [default] draft
  | *  11:eba0b02801cb 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 'eba0b02801cb'
  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 run 'hg evolve --continue' or use 'hg update -C .' to abort
  [255]

  $ echo foobar > d
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve --continue
  working directory is now at 3e0a8df515d6

  $ hg glog
  @  13:3e0a8df515d6 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 3e0a8df515d6 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 3e0a8df515d6
  (hidden revision '3e0a8df515d6' was rewritten as: 9ad4721c9004)
  working directory parent is obsolete! (3e0a8df515d6)
  (use 'hg evolve' to update to its successor: 9ad4721c9004)
  $ echo wat > d
  $ hg amend -m "wat to d, wat?"
  2 new content-divergent changesets

  $ hg glog
  @  15:1e834b60df1b wat to d, wat?
  |   () [default] draft
  | *  14:9ad4721c9004 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 '9ad4721c9004'
  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 run 'hg evolve --continue' or use 'hg update -C .' to abort
  [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 00f8d08aea43

  $ hg glog
  @  16:00f8d08aea43 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
  nothing changed

  $ hg glog
  @  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 exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 7ed0642d644bb9ad93d252dd9ffe7b4729febe48
  # Parent  c7586e2a92645e473645847a7b69a6dc52be4276
  added b
  
  diff -r c7586e2a9264 -r 7ed0642d644b 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:[5] added b
  move:[4] added d
  atop:[8] added c
  working directory is now at b6b20b8eefdc
  $ hg glog
  @  9:b6b20b8eefdc added d
  |   () [default] draft
  o  8:7c46f743e62f added c
  |   () [default] draft
  o  5:7ed0642d644b 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 .
  @  10:cfae5f87cd34 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 cfae5f87cd34 --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset cfae5f87cd34
  (hidden revision 'cfae5f87cd34' was rewritten as: 580d9d182d90)
  working directory parent is obsolete! (cfae5f87cd34)
  (use 'hg evolve' to update to its successor: 580d9d182d90)
  $ hg rebase -r . -d b6b20b8eefdc --config experimental.evolution.allowdivergence=True
  rebasing 10:cfae5f87cd34 "added x"
  2 new content-divergent changesets

  $ hg glog
  @  12:c4d1990428e3 added x
  |   () [default] draft
  | *  11:580d9d182d90 added foo to x
  | |   () [bar] draft
  o |  9:b6b20b8eefdc added d
  | |   () [default] draft
  o |  8:7c46f743e62f added c
  |/    () [default] draft
  o  5:7ed0642d644b added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[12] added x
  with: [11] added foo to x
  base: [10] added x
  rebasing "other" content-divergent changeset 580d9d182d90 on b6b20b8eefdc
  updating to "local" side of the conflict: c4d1990428e3
  merging "other" content-divergent changeset 'd3bfc0b3f350'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  working directory is now at be41fdcd0ee1

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Branch bar
  # Node ID be41fdcd0ee181081c4e42c6ee333d3dc3b3ab45
  # Parent  b6b20b8eefdce1f32126c71d20bdb72a62b38268
  added foo to x
  
  diff -r b6b20b8eefdc -r be41fdcd0ee1 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
  @  14:be41fdcd0ee1 added foo to x
  |   () [bar] draft
  o  9:b6b20b8eefdc added d
  |   () [default] draft
  o  8:7c46f743e62f added c
  |   () [default] draft
  o  5:7ed0642d644b 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 .
  @  15:9c30046901ab added y
  |   () [default] draft
  ~

  $ echo bar > y
  $ hg amend

  $ hg up 9c30046901ab --hidden
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 9c30046901ab
  (hidden revision '9c30046901ab' was rewritten as: 29e08829c51f)
  working directory parent is obsolete! (9c30046901ab)
  (use 'hg evolve' to update to its successor: 29e08829c51f)
  $ hg rebase -r . -d be41fdcd0ee1 --config experimental.evolution.allowdivergence=True
  rebasing 15:9c30046901ab "added y"
  2 new content-divergent changesets
  $ echo wat > y
  $ hg amend

  $ hg glog
  @  18:4065e1d314c3 added y
  |   () [bar] draft
  | *  16:29e08829c51f added y
  | |   () [default] draft
  o |  14:be41fdcd0ee1 added foo to x
  | |   () [bar] draft
  o |  9:b6b20b8eefdc added d
  | |   () [default] draft
  o |  8:7c46f743e62f added c
  |/    () [default] draft
  o  5:7ed0642d644b added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[18] added y
  with: [16] added y
  base: [15] added y
  rebasing "other" content-divergent changeset 29e08829c51f on be41fdcd0ee1
  updating to "local" side of the conflict: 4065e1d314c3
  merging "other" content-divergent changeset '6d515d1ffc69'
  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 run 'hg evolve --continue' or use 'hg update -C .' to abort
  [255]

  $ echo watbar > y
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve --continue
  working directory is now at bbaca013758a

  $ hg glog
  @  20:bbaca013758a added y
  |   () [bar] draft
  o  14:be41fdcd0ee1 added foo to x
  |   () [bar] draft
  o  9:b6b20b8eefdc added d
  |   () [default] draft
  o  8:7c46f743e62f added c
  |   () [default] draft
  o  5:7ed0642d644b added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg obslog -r . --all
  @    bbaca013758a (20) added y
  |\
  x |  4065e1d314c3 (18) added y
  | |    rewritten(content) as bbaca013758a using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  | x  6d515d1ffc69 (19) added y
  | |    rewritten(branch, content) as bbaca013758a using evolve by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  | x  29e08829c51f (16) added y
  | |    rewritten(parent) as 6d515d1ffc69 using evolve by test (Thu Jan 01 00:00:00 1970 +0000)
  | |
  x |  f1d75198aac4 (17) added y
  |/     rewritten(content) as 4065e1d314c3 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |
  x  9c30046901ab (15) added y
       rewritten(content) as 29e08829c51f using amend by test (Thu Jan 01 00:00:00 1970 +0000)
       rewritten(branch, parent) as f1d75198aac4 using rebase by test (Thu Jan 01 00:00:00 1970 +0000)
  

checking that relocated commit is there
  $ hg exp 6d515d1ffc69 --hidden
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 6d515d1ffc6925b036c933078ccb804c26da80b2
  # Parent  be41fdcd0ee181081c4e42c6ee333d3dc3b3ab45
  added y
  
  diff -r be41fdcd0ee1 -r 6d515d1ffc69 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
  @  20:bbaca013758a added y
  |   () [bar] draft
  o  14:be41fdcd0ee1 added foo to x
  |   () [bar] draft
  o  9:b6b20b8eefdc added d
  |   () [default] draft
  o  8:7c46f743e62f added c
  |   () [default] draft
  o  5:7ed0642d644b 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 .
  @  21:884c9d1a1a84 added z
  |   () [default] draft
  ~

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

  $ hg up 884c9d1a1a84 --hidden
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  updated to hidden changeset 884c9d1a1a84
  (hidden revision '884c9d1a1a84' was rewritten as: 3e22a949fe7d)
  working directory parent is obsolete! (884c9d1a1a84)
  (use 'hg evolve' to update to its successor: 3e22a949fe7d)
  $ hg rebase -r . -d bbaca013758a --config experimental.evolution.allowdivergence=True
  rebasing 21:884c9d1a1a84 "added z"
  2 new content-divergent changesets
  $ echo bar > z
  $ hg amend

  $ hg glog
  @  24:d2eca78cc588 added z
  |   () [bar] draft
  | *  22:3e22a949fe7d added z
  | |   () [default] draft
  o |  20:bbaca013758a added y
  | |   () [bar] draft
  o |  14:be41fdcd0ee1 added foo to x
  | |   () [bar] draft
  o |  9:b6b20b8eefdc added d
  | |   () [default] draft
  o |  8:7c46f743e62f added c
  |/    () [default] draft
  o  5:7ed0642d644b added b
  |   () [default] draft
  o  1:c7586e2a9264 added a
  |   () [default] draft
  o  0:8fa14d15e168 added hgignore
      () [default] draft

  $ hg evolve --content-divergent
  merge:[24] added z
  with: [22] added z
  base: [21] added z
  rebasing "other" content-divergent changeset 3e22a949fe7d on bbaca013758a
  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 bbaca013758a 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: bbaca013758a bar - test: added y
   watbar
  +=======
  +foo
  +>>>>>>> evolving:    3e22a949fe7d - test: added z
  diff -r bbaca013758a 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 a15eb4e32166

  $ hg glog
  @  25:a15eb4e32166 added z
  |   () [default] draft
  o  20:bbaca013758a added y
  |   () [bar] draft
  o  14:be41fdcd0ee1 added foo to x
  |   () [bar] draft
  o  9:b6b20b8eefdc added d
  |   () [default] draft
  o  8:7c46f743e62f added c
  |   () [default] draft
  o  5:7ed0642d644b 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 a15eb4e32166b0652fdec4c1dd30c9d668323bac
  # Parent  bbaca013758a55364955939e2d2e4536cb8d05cf
  added z
  
  diff -r bbaca013758a -r a15eb4e32166 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 bbaca013758a -r a15eb4e32166 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