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).
$ cat >> $HGRCPATH <<EOF
> [extensions]
> EOF
$ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
$ echo "drophack=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/hack/drophack.py" >> $HGRCPATH
$ mkcommit() {
> echo "$1" > "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ summary() {
> echo ============ graph ==============
> hg log -G
> echo ============ hidden =============
> hg log --hidden -G
> echo ============ obsmark ============
> hg debugobsolete
> }
$ hg init repo
$ cd repo
$ mkcommit base
drop a single changeset without any rewrite
================================================
$ mkcommit simple-single
$ summary
============ graph ==============
@ changeset: 1:d4e7845543ff
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add simple-single
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 1:d4e7845543ff
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add simple-single
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============
$ hg drop .
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
working directory now at b4952fcf48cf
search obsmarker: wall * comb * user * sys * (glob)
0 obsmarkers found
search nodes: wall * comb * user * sys * (glob)
1 nodes found
saved backup bundle to $TESTTMP/repo/.hg/strip-backup/d4e7845543ff-8ad8efe0-drophack.hg (glob)
strip nodes: wall * comb * user * sys * (glob)
$ summary
============ graph ==============
@ changeset: 0:b4952fcf48cf
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 0:b4952fcf48cf
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============
Try to drop a changeset with children
================================================
$ mkcommit parent
$ mkcommit child
$ summary
============ graph ==============
@ changeset: 2:34b6c051bf1f
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 2:34b6c051bf1f
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============
$ hg drop 1
cannot drop revision with children (no-eol)
[1]
$ summary
============ graph ==============
@ changeset: 2:34b6c051bf1f
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 2:34b6c051bf1f
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============
Try to drop a public changeset
================================================
$ hg phase --public 2
$ hg drop 2
cannot drop public revision (no-eol)
[1]
Try to drop a changeset with rewrite
================================================
$ hg phase --force --draft 2
$ echo babar >> child
$ hg commit --amend
$ summary
============ graph ==============
@ changeset: 3:a2c06c884bfe
| tag: tip
| parent: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 3:a2c06c884bfe
| tag: tip
| parent: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add child
|
| x changeset: 2:34b6c051bf1f
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| obsolete: amended using amend as 3:a2c06c884bfe
| summary: add child
|
o changeset: 1:19509a42b0d0
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============
34b6c051bf1f78db6aef400776de5cb964470207 a2c06c884bfe53d3840026248bd8a7eafa152df8 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '8', 'operation': 'amend', 'user': 'test'}
$ hg drop .
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
working directory now at 19509a42b0d0
search obsmarker: wall * comb * user * sys * (glob)
1 obsmarkers found
search nodes: wall * comb * user * sys * (glob)
2 nodes found
strip obsmarker: wall * comb * user * sys * (glob)
saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-drophack.hg (glob)
strip nodes: wall * comb * user * sys * (glob)
$ summary
============ graph ==============
@ changeset: 1:19509a42b0d0
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ hidden =============
@ changeset: 1:19509a42b0d0
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: add parent
|
o changeset: 0:b4952fcf48cf
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add base
============ obsmark ============