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).
Test for issue 5832 present at https://bz.mercurial-scm.org/show_bug.cgi?id=5832
================================================================================
Setup
=====
$ cat >> $HGRCPATH <<EOF
> [phases]
> publish = False
> [alias]
> glog = log -GT "{rev}:{node|short} {desc}\n ({bookmarks}) {phase}"
> [extensions]
> EOF
$ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
$ hg init issue5832
$ cd issue5832
$ echo base > base
$ hg ci -Aqm "added base"
$ echo a > a
$ hg ci -Aqm "added a"
$ echo b > b
$ hg ci -Aqm "added b"
$ hg up .^^
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo c > c
$ echo d > d
$ hg ci -Aqm "added c and d"
$ hg merge
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m "merge commit"
$ hg glog
@ 4:b9b387427a53 merge commit
|\ () draft
| o 3:9402371b436e added c and d
| | () draft
o | 2:a1da0651488c added b
| | () draft
o | 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg up 1b24879c5c3c
0 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ echo foo > a
$ hg amend
2 new orphan changesets
$ hg up bde1d2b6b5e5
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo c > c
$ hg ci -Aqm "added c"
$ hg up .^
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo d > d
$ hg ci -Aqm "added d"
$ hg glog
@ 7:5841d7cf9893 added d
| () draft
| o 6:62fb70414f99 added c
|/ () draft
| o 5:7014ec2829cd added a
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---o 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg prune -r 9402371b436e --succ 62fb70414f99 --succ 5841d7cf9893 --split
1 changesets pruned
$ hg glog
@ 7:5841d7cf9893 added d
| () draft
| o 6:62fb70414f99 added c
|/ () draft
| o 5:7014ec2829cd added a
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---x 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
Checking what evolve is trying to do
$ hg evolve --dry-run --any --all
move:[2] added b
atop:[5] added a
hg rebase -r a1da0651488c -d 7014ec2829cd
could not solve instability, ambiguous destination: parent split across two branches
Resolving instability using `hg evolve`
$ hg evolve --any --all --config ui.interactive=True <<EOF
> 1
> EOF
move:[2] added b
atop:[5] added a
move:[4] merge commit
ancestor of '7235ef625ea3' split over multiple topological branches.
choose an evolve destination:
1: [62fb70414f99] added c
2: [5841d7cf9893] added d
q: quit the prompt
enter the index of the revision you want to select: 1
move:[9] merge commit
atop:[6] added c
$ hg glog
o 10:28a0775ac832 merge commit
|\ () draft
| o 8:2baf8bae7ea4 added b
| | () draft
| | @ 7:5841d7cf9893 added d
| | | () draft
o---+ 6:62fb70414f99 added c
/ / () draft
o / 5:7014ec2829cd added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ cd ..
Test for issue5833 present at https://bz.mercurial-scm.org/show_bug.cgi?id=5833
===============================================================================
$ hg init issue5833
$ cd issue5833
$ echo base > base
$ hg ci -Aqm "added base"
$ echo a > a
$ hg ci -Aqm "added a"
$ echo b > b
$ hg ci -Aqm "added b"
$ hg up .^^
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo c > c
$ echo d > d
$ hg ci -Aqm "added c and d"
$ hg merge
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m "merge commit"
$ hg glog
@ 4:b9b387427a53 merge commit
|\ () draft
| o 3:9402371b436e added c and d
| | () draft
o | 2:a1da0651488c added b
| | () draft
o | 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg log -r 'p1(.)'
changeset: 3:9402371b436e
parent: 0:bde1d2b6b5e5
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: added c and d
$ hg up bde1d2b6b5e5
0 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ echo l > l
$ hg ci -Aqm "added l"
$ hg pick -r 1b24879c5c3c
picking 1:1b24879c5c3c "added a"
2 new orphan changesets
$ hg up bde1d2b6b5e5
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo c > c
$ hg ci -Aqm "added c"
$ hg up .^
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo d > d
$ hg ci -Aqm "added d"
$ hg glog
@ 8:5841d7cf9893 added d
| () draft
| o 7:62fb70414f99 added c
|/ () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---o 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg prune -r 9402371b436e --succ 5841d7cf9893 --succ 62fb70414f99 --split
1 changesets pruned
$ hg glog
@ 8:5841d7cf9893 added d
| () draft
| o 7:62fb70414f99 added c
|/ () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---x 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg evolve --any --all --dry-run
move:[2] added b
atop:[6] added a
hg rebase -r a1da0651488c -d 5568b87b1491
could not solve instability, ambiguous destination: parent split across two branches
$ hg evolve --any --all --config ui.interactive=True <<EOF
> 2
> EOF
move:[2] added b
atop:[6] added a
move:[4] merge commit
ancestor of 'cdf2ea1b9312' split over multiple topological branches.
choose an evolve destination:
1: [62fb70414f99] added c
2: [5841d7cf9893] added d
q: quit the prompt
enter the index of the revision you want to select: 2
move:[10] merge commit
atop:[8] added d
$ hg glog
o 11:460e6e72b7f9 merge commit
|\ () draft
| o 9:da76bb7cd904 added b
| | () draft
@ | 8:5841d7cf9893 added d
| | () draft
+---o 7:62fb70414f99 added c
| | () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ cd ..
Test for issue5946 present at https://bz.mercurial-scm.org/show_bug.cgi?id=5946
===============================================================================
issue with computing dependency with split and merge
$ hg init issue5946
$ cd issue5946
$ echo base > base
$ hg ci -Aqm "added base"
$ echo a > a
$ hg ci -Aqm "added a"
$ echo b > b
$ hg ci -Aqm "added b"
$ hg up .^^
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo c > c
$ echo d > d
$ hg ci -Aqm "added c and d"
The next line is the only difference from issue5833 above, i.e. the order of
the parents is reversed
$ hg co 2
2 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ hg merge
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m "merge commit"
$ hg glog
@ 4:b9b387427a53 merge commit
|\ () draft
| o 3:9402371b436e added c and d
| | () draft
o | 2:a1da0651488c added b
| | () draft
o | 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg log -r 'p1(.)'
changeset: 2:a1da0651488c
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: added b
$ hg up bde1d2b6b5e5
0 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ echo l > l
$ hg ci -Aqm "added l"
$ hg pick -r 1b24879c5c3c
picking 1:1b24879c5c3c "added a"
2 new orphan changesets
$ hg up bde1d2b6b5e5
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo c > c
$ hg ci -Aqm "added c"
$ hg up .^
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo d > d
$ hg ci -Aqm "added d"
$ hg glog
@ 8:5841d7cf9893 added d
| () draft
| o 7:62fb70414f99 added c
|/ () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---o 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg prune -r 9402371b436e --succ 5841d7cf9893 --succ 62fb70414f99 --split
1 changesets pruned
$ hg glog
@ 8:5841d7cf9893 added d
| () draft
| o 7:62fb70414f99 added c
|/ () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
| * 4:b9b387427a53 merge commit
| |\ () draft
+---x 3:9402371b436e added c and d
| | () draft
| * 2:a1da0651488c added b
| | () draft
| x 1:1b24879c5c3c added a
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft
$ hg evolve --any --all --dry-run
move:[2] added b
atop:[6] added a
hg rebase -r a1da0651488c -d 5568b87b1491
could not solve instability, ambiguous destination: parent split across two branches
$ hg evolve --any --all --config ui.interactive=True <<EOF
> 2
> EOF
move:[2] added b
atop:[6] added a
ancestor of 'b9b387427a53' split over multiple topological branches.
choose an evolve destination:
1: [62fb70414f99] added c
2: [5841d7cf9893] added d
q: quit the prompt
enter the index of the revision you want to select: 2
move:[4] merge commit
atop:[8] added d
move:[10] merge commit
atop:[9] added b
$ hg glog
o 11:578c938ebd2e merge commit
|\ () draft
| o 9:da76bb7cd904 added b
| | () draft
@ | 8:5841d7cf9893 added d
| | () draft
+---o 7:62fb70414f99 added c
| | () draft
| o 6:5568b87b1491 added a
| | () draft
| o 5:0a6281e212fe added l
|/ () draft
o 0:bde1d2b6b5e5 added base
() draft