mirror of
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7172b75ac8
Previously, two changes that were nearly, but not quite, identical would result in large merge conflict regions that looked very similar, and were thus very confusing to users, and lead people used to other source control systems to claim that "mercurial's merge algorithms suck". In the relatively common case of a new file being introduced in two branches with very slight modifications, the old behavior would show the entire file as a conflict, and it would be very difficult for a user to determine what was going on. In the past, mercurial attempted to solve this with a "very smart" algorithm that would find all common lines, but this has significant problems as described in 3d22d20aa950. Instead, we use a "very dumb" algorithm introduced in the previous patch that simply matches lines at the periphery of conflict regions. This minimizes most conflict regions well, though there may still be some degenerate edge cases, like small modification to the beginning and end of a large file.
360 lines
9.1 KiB
Perl
360 lines
9.1 KiB
Perl
$ cat >> $HGRCPATH <<EOF
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> [format]
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> usegeneraldelta=yes
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> [extensions]
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> rebase=
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>
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> [phases]
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> publish=False
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>
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> [alias]
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> tglog = log -G --template "{rev}:{phase} '{desc}' {branches} {bookmarks}\n"
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> EOF
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$ hg init a
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$ cd a
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$ echo c1 >common
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$ hg add common
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$ hg ci -m C1
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$ echo c2 >>common
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$ hg ci -m C2
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$ echo c3 >>common
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$ hg ci -m C3
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$ hg up -q -C 1
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$ echo l1 >>extra
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$ hg add extra
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$ hg ci -m L1
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created new head
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$ sed -e 's/c2/l2/' common > common.new
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$ mv common.new common
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$ hg ci -m L2
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$ echo l3 >> extra2
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$ hg add extra2
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$ hg ci -m L3
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$ hg bookmark mybook
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$ hg phase --force --secret 4
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$ hg tglog
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@ 5:secret 'L3' mybook
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o 4:secret 'L2'
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o 3:draft 'L1'
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| o 2:draft 'C3'
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|/
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o 1:draft 'C2'
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o 0:draft 'C1'
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Try to call --continue:
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$ hg rebase --continue
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abort: no rebase in progress
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[255]
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Conflicting rebase:
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$ hg rebase -s 3 -d 2
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rebasing 3:3163e20567cc "L1"
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rebasing 4:46f0b057b5c0 "L2"
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merging common
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warning: conflicts while merging common! (edit, then use 'hg resolve --mark')
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unresolved conflicts (see hg resolve, then hg rebase --continue)
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[1]
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Try to continue without solving the conflict:
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$ hg rebase --continue
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already rebased 3:3163e20567cc "L1" as 3e046f2ecedb
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rebasing 4:46f0b057b5c0 "L2"
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abort: unresolved merge conflicts (see "hg help resolve")
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[255]
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Conclude rebase:
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$ echo 'resolved merge' >common
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$ hg resolve -m common
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(no more unresolved files)
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continue: hg rebase --continue
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$ hg rebase --continue
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already rebased 3:3163e20567cc "L1" as 3e046f2ecedb
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rebasing 4:46f0b057b5c0 "L2"
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rebasing 5:8029388f38dc "L3" (mybook)
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saved backup bundle to $TESTTMP/a/.hg/strip-backup/3163e20567cc-5ca4656e-backup.hg (glob)
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$ hg tglog
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@ 5:secret 'L3' mybook
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o 4:secret 'L2'
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o 3:draft 'L1'
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o 2:draft 'C3'
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o 1:draft 'C2'
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o 0:draft 'C1'
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Check correctness:
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$ hg cat -r 0 common
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c1
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$ hg cat -r 1 common
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c1
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c2
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$ hg cat -r 2 common
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c1
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c2
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c3
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$ hg cat -r 3 common
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c1
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c2
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c3
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$ hg cat -r 4 common
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resolved merge
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$ hg cat -r 5 common
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resolved merge
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Bookmark stays active after --continue
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$ hg bookmarks
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* mybook 5:d67b21408fc0
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$ cd ..
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Check that the right ancestors is used while rebasing a merge (issue4041)
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$ hg clone "$TESTDIR/bundles/issue4041.hg" issue4041
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requesting all changes
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adding changesets
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adding manifests
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adding file changes
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added 11 changesets with 8 changes to 3 files (+1 heads)
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updating to branch default
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2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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$ cd issue4041
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$ hg log -G
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o changeset: 10:2f2496ddf49d
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|\ branch: f1
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| | tag: tip
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| | parent: 7:4c9fbe56a16f
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| | parent: 9:e31216eec445
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| | user: szhang
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| | date: Thu Sep 05 12:59:39 2013 -0400
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| | summary: merge
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| |
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| o changeset: 9:e31216eec445
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| | branch: f1
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| | user: szhang
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| | date: Thu Sep 05 12:59:10 2013 -0400
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| | summary: more changes to f1
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| o changeset: 8:8e4e2c1a07ae
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| |\ branch: f1
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| | | parent: 2:4bc80088dc6b
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| | | parent: 6:400110238667
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| | | user: szhang
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| | | date: Thu Sep 05 12:57:59 2013 -0400
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| | | summary: bad merge
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| | |
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o | | changeset: 7:4c9fbe56a16f
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|/ / branch: f1
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| | parent: 2:4bc80088dc6b
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| | user: szhang
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| | date: Thu Sep 05 12:54:00 2013 -0400
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| | summary: changed f1
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| o changeset: 6:400110238667
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| | branch: f2
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| | parent: 4:12e8ec6bb010
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| | user: szhang
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| | date: Tue Sep 03 13:58:02 2013 -0400
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| | summary: changed f2 on f2
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| | @ changeset: 5:d79e2059b5c0
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| | | parent: 3:8a951942e016
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| | | user: szhang
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| | | date: Tue Sep 03 13:57:39 2013 -0400
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| | | summary: changed f2 on default
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| o | changeset: 4:12e8ec6bb010
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| |/ branch: f2
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| | user: szhang
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| | date: Tue Sep 03 13:57:18 2013 -0400
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| | summary: created f2 branch
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| o changeset: 3:8a951942e016
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| | parent: 0:24797d4f68de
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| | user: szhang
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| | date: Tue Sep 03 13:57:11 2013 -0400
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| | summary: added f2.txt
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o | changeset: 2:4bc80088dc6b
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| | branch: f1
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| | user: szhang
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| | date: Tue Sep 03 13:56:20 2013 -0400
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| | summary: added f1.txt
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o | changeset: 1:ef53c9e6b608
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|/ branch: f1
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| user: szhang
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| date: Tue Sep 03 13:55:26 2013 -0400
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| summary: created f1 branch
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o changeset: 0:24797d4f68de
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user: szhang
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date: Tue Sep 03 13:55:08 2013 -0400
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summary: added default.txt
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$ hg rebase -s9 -d2 --debug # use debug to really check merge base used
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rebase onto 2 starting from e31216eec445
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ignoring null merge rebase of 3
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ignoring null merge rebase of 4
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ignoring null merge rebase of 6
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ignoring null merge rebase of 8
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rebasing 9:e31216eec445 "more changes to f1"
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future parents are 2 and -1
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rebase status stored
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update to 2:4bc80088dc6b
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resolving manifests
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branchmerge: False, force: True, partial: False
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ancestor: d79e2059b5c0+, local: d79e2059b5c0+, remote: 4bc80088dc6b
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f2.txt: other deleted -> r
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removing f2.txt
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f1.txt: remote created -> g
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getting f1.txt
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merge against 9:e31216eec445
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detach base 8:8e4e2c1a07ae
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searching for copies back to rev 3
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resolving manifests
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branchmerge: True, force: True, partial: False
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ancestor: 8e4e2c1a07ae, local: 4bc80088dc6b+, remote: e31216eec445
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f1.txt: remote is newer -> g
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getting f1.txt
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committing files:
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f1.txt
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committing manifest
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committing changelog
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rebased as 19c888675e13
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rebasing 10:2f2496ddf49d "merge" (tip)
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future parents are 11 and 7
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rebase status stored
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already in target
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merge against 10:2f2496ddf49d
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detach base 9:e31216eec445
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searching for copies back to rev 3
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resolving manifests
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branchmerge: True, force: True, partial: False
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ancestor: e31216eec445, local: 19c888675e13+, remote: 2f2496ddf49d
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f1.txt: remote is newer -> g
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getting f1.txt
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committing files:
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f1.txt
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committing manifest
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committing changelog
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rebased as 2a7f09cac94c
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rebase merging completed
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update back to initial working directory parent
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resolving manifests
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branchmerge: False, force: False, partial: False
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ancestor: 2a7f09cac94c, local: 2a7f09cac94c+, remote: d79e2059b5c0
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f1.txt: other deleted -> r
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removing f1.txt
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f2.txt: remote created -> g
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getting f2.txt
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2 changesets found
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list of changesets:
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e31216eec445e44352c5f01588856059466a24c9
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2f2496ddf49d69b5ef23ad8cf9fb2e0e4faf0ac2
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bundle2-output-bundle: "HG20", (1 params) 1 parts total
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bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
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saved backup bundle to $TESTTMP/issue4041/.hg/strip-backup/e31216eec445-15f7a814-backup.hg (glob)
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3 changesets found
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list of changesets:
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4c9fbe56a16f30c0d5dcc40ec1a97bbe3325209c
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19c888675e133ab5dff84516926a65672eaf04d9
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2a7f09cac94c7f4b73ebd5cd1a62d3b2e8e336bf
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bundle2-output-bundle: "HG20", 1 parts total
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bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
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adding branch
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bundle2-input-bundle: with-transaction
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bundle2-input-part: "changegroup" (params: 1 mandatory) supported
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adding changesets
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add changeset 4c9fbe56a16f
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add changeset 19c888675e13
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add changeset 2a7f09cac94c
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adding manifests
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adding file changes
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adding f1.txt revisions
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added 2 changesets with 2 changes to 1 files
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bundle2-input-part: total payload size 1713
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bundle2-input-bundle: 0 parts total
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invalid branchheads cache (served): tip differs
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rebase completed
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updating the branch cache
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truncating cache/rbc-revs-v1 to 72
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Test minimization of merge conflicts
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$ hg up -q null
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$ echo a > a
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$ hg add a
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$ hg commit -q -m 'a'
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$ echo b >> a
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$ hg commit -q -m 'ab'
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$ hg bookmark ab
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$ hg up -q '.^'
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$ echo b >> a
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$ echo c >> a
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$ hg commit -q -m 'abc'
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$ hg rebase -s 7bc217434fc1 -d ab --keep
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rebasing 13:7bc217434fc1 "abc" (tip)
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merging a
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warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
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unresolved conflicts (see hg resolve, then hg rebase --continue)
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[1]
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$ hg diff
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diff -r 328e4ab1f7cc a
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--- a/a Thu Jan 01 00:00:00 1970 +0000
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+++ b/a * (glob)
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@@ -1,2 +1,6 @@
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a
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b
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+<<<<<<< dest: 328e4ab1f7cc ab - test: ab
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+=======
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+c
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+>>>>>>> source: 7bc217434fc1 - test: abc
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$ hg rebase --abort
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rebase aborted
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$ hg up -q -C 7bc217434fc1
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$ hg rebase -s . -d ab --keep -t internal:merge3
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rebasing 13:7bc217434fc1 "abc" (tip)
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merging a
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warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
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unresolved conflicts (see hg resolve, then hg rebase --continue)
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[1]
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$ hg diff
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diff -r 328e4ab1f7cc a
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--- a/a Thu Jan 01 00:00:00 1970 +0000
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+++ b/a * (glob)
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@@ -1,2 +1,8 @@
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a
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+<<<<<<< dest: 328e4ab1f7cc ab - test: ab
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b
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+||||||| base
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+=======
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+b
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+c
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+>>>>>>> source: 7bc217434fc1 - test: abc
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