evolve: handle relocation during divergence resolution producing no changes
When resolving divergence and the two divergent commits have different
parents, we start by rebasing one of them to have the same parent as
the other. That step can result in no changes to commit. When it does,
we would crash with a TypeError before this patch.
This patch fixes it by instead creating an empty commit in that
scenario. The existing code then continues to attempt to merge it,
which produces no changes, and no commit is created on top. The other
side of the divergence is marked as successor as usual, so orphans
from the side that became empty will be evolved to the right place
(see test).
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
$ hg glog
o 4 - 813dde83a7f3 c (secret)
|
@ 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')
unresolved merge conflicts
(see 'hg help evolve.interrupted')
[1]
$ 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 87495ea7c9ec
$ hg glog
o 4 - 3d2080c198e5 c (secret)
|
@ 3 - 87495ea7c9ec b (draft)
|
o 0 - cb9a9f314b8b a (draft)