view tests/test-evolve-phase.t @ 3573:d53277cdc1e7

evolve: handle stabilization of merge changeset with both parents obsoleted

This patch adds logic to stabilize an orphan merge changeset having both parents
obsoleted.

The logic tries to first stabilize the merge changeset on successor of second
parent and then stabilize the new changeset formed on the successor of first
parent. We are stabilizing on second parent first and then to second parent to
preserve the first parent's successor as first parent of the merge changeset.

Conflicts can occcur and we can loose processing information, therefore we store
a variable in statefile `orphanmerge` which represents whether we are processing
a merge changeset with both parents obsoleted.

Thanks to Pierre-Yves David for suggesting this way and helping to understand
the correctness of this.

More rigourous test cases for this will be added in next patch.

Testing the handling of phases for `hg evolve` command

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

Testing when there are no conflicts during evolve

  $ hg init noconflict
  $ cd noconflict
  $ echo a>a
  $ hg ci -Aqm a
  $ echo b>b
  $ hg ci -Aqm b
  $ echo c>c
  $ hg ci -Aqsm c
  $ hg glog
  @  2 - 177f92b77385 c (secret)
  |
  o  1 - d2ae7f538514 b (draft)
  |
  o  0 - cb9a9f314b8b a (draft)
  

  $ hg prev
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  [1] b
  $ echo b2>b
  $ hg amend
  1 new orphan changesets
  $ hg evolve
  move:[2] c
  atop:[3] b
  working directory is now at 813dde83a7f3
  $ hg glog
  @  4 - 813dde83a7f3 c (secret)
  |
  o  3 - fd89d0f19529 b (draft)
  |
  o  0 - cb9a9f314b8b a (draft)
  
  $ cd ..

Testing case when there are conflicts (bug 5720)

  $ hg init conflicts
  $ cd conflicts
  $ echo a > a
  $ hg ci -Am a
  adding a
  $ echo b > a
  $ hg ci -m b
  $ echo c > a
  $ hg ci -sm c
  $ hg glog
  @  2 - 13833940840c c (secret)
  |
  o  1 - 1e6c11564562 b (draft)
  |
  o  0 - cb9a9f314b8b a (draft)
  

  $ hg prev
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  [1] b
  $ echo b2 > a
  $ hg amend
  1 new orphan changesets

  $ hg glog
  @  3 - 87495ea7c9ec b (draft)
  |
  | *  2 - 13833940840c c (secret)
  | |
  | x  1 - 1e6c11564562 b (draft)
  |/
  o  0 - cb9a9f314b8b a (draft)
  
  $ hg evolve
  move:[2] c
  atop:[3] b
  merging a
  warning: conflicts while merging a! (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]

  $ hg diff
  diff -r 87495ea7c9ec a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,5 @@
  +<<<<<<< destination: 87495ea7c9ec - test: b
   b2
  +=======
  +c
  +>>>>>>> evolving:    13833940840c - test: c

  $ hg glog
  @  3 - 87495ea7c9ec b (draft)
  |
  | *  2 - 13833940840c c (secret)
  | |
  | x  1 - 1e6c11564562 b (draft)
  |/
  o  0 - cb9a9f314b8b a (draft)
  

  $ echo c2 > a
  $ hg resolve -m
  (no more unresolved files)
  continue: hg evolve --continue
  $ hg evolve -c
  evolving 2:13833940840c "c"
  working directory is now at 3d2080c198e5

  $ hg glog
  @  4 - 3d2080c198e5 c (secret)
  |
  o  3 - 87495ea7c9ec b (draft)
  |
  o  0 - cb9a9f314b8b a (draft)