documentation: add some internals documentation about bid merge
This is an important algorithm that was only documented on the wiki so far.
Some update to the algorithm (and associated doc) is to expected in the future
since the bid merge algorithm is bug-ridden when it comes to file deletion comes
to play.
Differential Revision: https://phab.mercurial-scm.org/D8711
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}'\n"
>
> [extensions]
> drawdag=$TESTDIR/drawdag.py
> EOF
Rebasing D onto B detaching from C (one commit):
$ hg init a1
$ cd a1
$ hg debugdrawdag <<EOF
> D
> |
> C B
> |/
> A
> EOF
$ hg phase --force --secret D
$ hg rebase -s D -d B
rebasing 3:e7b3f00ed42e "D" (D tip)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/e7b3f00ed42e-6f368371-rebase.hg
$ hg log -G --template "{rev}:{phase} '{desc}' {branches}\n"
o 3:secret 'D'
|
| o 2:draft 'C'
| |
o | 1:draft 'B'
|/
o 0:draft 'A'
$ hg manifest --rev tip
A
B
D
$ cd ..
Rebasing D onto B detaching from C (two commits):
$ hg init a2
$ cd a2
$ hg debugdrawdag <<EOF
> E
> |
> D
> |
> C B
> |/
> A
> EOF
$ hg rebase -s D -d B
rebasing 3:e7b3f00ed42e "D" (D)
rebasing 4:69a34c08022a "E" (E tip)
saved backup bundle to $TESTTMP/a2/.hg/strip-backup/e7b3f00ed42e-a2ec7cea-rebase.hg
$ hg tglog
o 4: ee79e0744528 'E'
|
o 3: 10530e1d72d9 'D'
|
| o 2: dc0947a82db8 'C'
| |
o | 1: 112478962961 'B'
|/
o 0: 426bada5c675 'A'
$ hg manifest --rev tip
A
B
D
E
$ cd ..
Rebasing C onto B using detach (same as not using it):
$ hg init a3
$ cd a3
$ hg debugdrawdag <<EOF
> D
> |
> C B
> |/
> A
> EOF
$ hg rebase -s C -d B
rebasing 2:dc0947a82db8 "C" (C)
rebasing 3:e7b3f00ed42e "D" (D tip)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/dc0947a82db8-b8481714-rebase.hg
$ hg tglog
o 3: 7375f3dbfb0f 'D'
|
o 2: bbfdd6cb49aa 'C'
|
o 1: 112478962961 'B'
|
o 0: 426bada5c675 'A'
$ hg manifest --rev tip
A
B
C
D
$ cd ..
Rebasing D onto B detaching from C and collapsing:
$ hg init a4
$ cd a4
$ hg debugdrawdag <<EOF
> E
> |
> D
> |
> C B
> |/
> A
> EOF
$ hg phase --force --secret E
$ hg rebase --collapse -s D -d B
rebasing 3:e7b3f00ed42e "D" (D)
rebasing 4:69a34c08022a "E" (E tip)
saved backup bundle to $TESTTMP/a4/.hg/strip-backup/e7b3f00ed42e-a2ec7cea-rebase.hg
$ hg log -G --template "{rev}:{phase} '{desc}' {branches}\n"
o 3:secret 'Collapsed revision
| * D
| * E'
| o 2:draft 'C'
| |
o | 1:draft 'B'
|/
o 0:draft 'A'
$ hg manifest --rev tip
A
B
D
E
$ cd ..
Rebasing across null as ancestor
$ hg init a5
$ cd a5
$ hg debugdrawdag <<EOF
> E
> |
> D
> |
> C
> |
> A B
> EOF
$ hg rebase -s C -d B
rebasing 2:dc0947a82db8 "C" (C)
rebasing 3:e7b3f00ed42e "D" (D)
rebasing 4:69a34c08022a "E" (E tip)
saved backup bundle to $TESTTMP/a5/.hg/strip-backup/dc0947a82db8-3eefec98-rebase.hg
$ hg tglog
o 4: e3d0c70d606d 'E'
|
o 3: e9153d36a1af 'D'
|
o 2: a7ac28b870a8 'C'
|
o 1: fc2b737bb2e5 'B'
o 0: 426bada5c675 'A'
$ hg rebase -d 1 -s 3
rebasing 3:e9153d36a1af "D"
rebasing 4:e3d0c70d606d "E" (tip)
saved backup bundle to $TESTTMP/a5/.hg/strip-backup/e9153d36a1af-db7388ed-rebase.hg
$ hg tglog
o 4: 2c24e540eccd 'E'
|
o 3: 73f786ed52ff 'D'
|
| o 2: a7ac28b870a8 'C'
|/
o 1: fc2b737bb2e5 'B'
o 0: 426bada5c675 'A'
$ cd ..
Verify that target is not selected as external rev (issue3085)
$ hg init a6
$ cd a6
$ hg debugdrawdag <<EOF
> H
> | G
> |/|
> F E
> |/
> A
> EOF
$ hg up -q G
$ echo "I" >> E
$ hg ci -m "I"
$ hg tag --local I
$ hg merge H
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m "Merge"
$ echo "J" >> F
$ hg ci -m "J"
$ hg tglog
@ 7: c6aaf0d259c0 'J'
|
o 6: 0cfbc7e8faaf 'Merge'
|\
| o 5: b92d164ad3cb 'I'
| |
o | 4: 4ea5b230dea3 'H'
| |
| o 3: c6001eacfde5 'G'
|/|
o | 2: 8908a377a434 'F'
| |
| o 1: 7fb047a69f22 'E'
|/
o 0: 426bada5c675 'A'
$ hg rebase -s I -d H --collapse --config ui.merge=internal:other
rebasing 5:b92d164ad3cb "I" (I)
rebasing 6:0cfbc7e8faaf "Merge"
rebasing 7:c6aaf0d259c0 "J" (tip)
saved backup bundle to $TESTTMP/a6/.hg/strip-backup/b92d164ad3cb-88fd7ab7-rebase.hg
$ hg tglog
@ 5: 65079693dac4 'Collapsed revision
| * I
| * Merge
| * J'
o 4: 4ea5b230dea3 'H'
|
| o 3: c6001eacfde5 'G'
|/|
o | 2: 8908a377a434 'F'
| |
| o 1: 7fb047a69f22 'E'
|/
o 0: 426bada5c675 'A'
$ hg log --rev tip
changeset: 5:65079693dac4
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Collapsed revision
$ cd ..
Ensure --continue restores a correct state (issue3046) and phase:
$ hg init a7
$ cd a7
$ hg debugdrawdag <<EOF
> C B
> |/
> A
> EOF
$ hg up -q C
$ echo 'B2' > B
$ hg ci -A -m 'B2'
adding B
$ hg phase --force --secret .
$ hg rebase -s . -d B --config ui.merge=internal:merge
rebasing 3:17b4880d2402 "B2" (tip)
merging B
warning: conflicts while merging B! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
$ hg resolve --all -t internal:local
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase -c
rebasing 3:17b4880d2402 "B2" (tip)
note: not rebasing 3:17b4880d2402 "B2" (tip), its destination already has all its changes
saved backup bundle to $TESTTMP/a7/.hg/strip-backup/17b4880d2402-1ae1f6cc-rebase.hg
$ hg log -G --template "{rev}:{phase} '{desc}' {branches}\n"
o 2:draft 'C'
|
| @ 1:draft 'B'
|/
o 0:draft 'A'
$ cd ..