subrepos: prompt on conflicts on update with dirty subrepos
Consider a repository with a single subrepository. The changesets in
the main repository reference the subrepository changesets like this:
m0 -> s0
m1 -> s1
m2 -> s2
Starting from a state (m1, s0), doing 'hg update m2' in the main
repository will yield a conflict: the subrepo is at revision s0 but
the target revision says it should be at revision s2.
Before this change, Mercurial would do (m1, s0) -> (m2, s2) and thus
ignore the conflict between the working copy and the target revision.
With this change, the user is prompted to resolve the conflict by
choosing which revision he wants. This is consistent with 'hg merge',
which also prompts the user when it detects conflicts in the merged
.hgsubstate files.
The prompt looks like this:
$ hg update tip
subrepository sources for my-subrepo differ
use (l)ocal source (
fc627a69481f) or (r)emote source (
12a213df6fa9)?
# Construct the following history tree:
#
# @ 5:e1bb631146ca b1
# |
# o 4:a4fdb3b883c4 0:b608b9236435 b1
# |
# | o 3:4b57d2520816 1:44592833ba9f
# | |
# | | o 2:063f31070f65
# | |/
# | o 1:44592833ba9f
# |/
# o 0:b608b9236435
$ hg init
$ echo foo > foo
$ echo zero > a
$ hg ci -qAm0
$ echo one > a ; hg ci -m1
$ echo two > a ; hg ci -m2
$ hg up -q 1
$ echo three > a ; hg ci -qm3
$ hg up -q 0
$ hg branch -q b1
$ echo four > a ; hg ci -qm4
$ echo five > a ; hg ci -qm5
Initial repo state:
$ hg --config 'extensions.graphlog=' \
> glog --template '{rev}:{node|short} {parents} {branches}\n'
@ 5:e1bb631146ca b1
|
o 4:a4fdb3b883c4 0:b608b9236435 b1
|
| o 3:4b57d2520816 1:44592833ba9f
| |
| | o 2:063f31070f65
| |/
| o 1:44592833ba9f
|/
o 0:b608b9236435
Test helper functions:
$ revtest () {
> msg=$1
> dirtyflag=$2 # 'clean' or 'dirty'
> startrev=$3
> targetrev=$4
> opt=$5
> hg up -qC $startrev
> test $dirtyflag = dirty && echo dirty > foo
> hg up $opt $targetrev
> hg parent --template 'parent={rev}\n'
> hg stat
> }
$ norevtest () {
> msg=$1
> dirtyflag=$2 # 'clean' or 'dirty'
> startrev=$3
> opt=$4
> hg up -qC $startrev
> test $dirtyflag = dirty && echo dirty > foo
> hg up $opt
> hg parent --template 'parent={rev}\n'
> hg stat
> }
Test cases are documented in a table in the update function of merge.py.
Cases are run as shown in that table, row by row.
$ norevtest 'none clean linear' clean 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=5
$ norevtest 'none clean same' clean 2
abort: crosses branches (merge branches or use --check to force update)
parent=2
$ revtest 'none clean linear' clean 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
$ revtest 'none clean same' clean 2 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
$ revtest 'none clean cross' clean 3 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=4
$ revtest 'none dirty linear' dirty 1 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
M foo
$ revtest 'none dirty same' dirty 2 3
abort: crosses branches (merge branches or use --clean to discard changes)
parent=2
M foo
$ revtest 'none dirty cross' dirty 3 4
abort: crosses branches (merge branches or use --clean to discard changes)
parent=3
M foo
$ revtest '-C dirty linear' dirty 1 2 -C
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=2
$ revtest '-c dirty linear' dirty 1 2 -c
abort: uncommitted local changes
parent=1
M foo
$ norevtest '-c clean same' clean 2 -c
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
parent=3
$ revtest '-cC dirty linear' dirty 1 2 -cC
abort: cannot specify both -c/--check and -C/--clean
parent=1
M foo