rebase: calculate ancestors for --base separately (issue5420)
Previously, the --base option only works with a single "branch" - if there
is one changeset in the "--base" revset whose branching point(s) is/are
different from another changeset in the "--base" revset, "rebase" will error
out with:
abort: source is ancestor of destination
This happens if the user has multiple draft branches, and uses "hg rebase -b
'draft()' -d master", for example. The error message looks cryptic to users
who don't know the implementation detail.
This patch changes the logic to calculate the common ancestor for every
"base" changeset separately so we won't (incorrectly) select "source" which
is an ancestor of the destination.
This patch should not change the behavior where all changesets specified by
"--base" have the same branching point(s).
A new situation is: some of the specified changesets could be rebased, while
some couldn't (because they are descendants of the destination, or they do
not share a common ancestor with the destination). The current behavior is
to show "nothing to rebase" and exits with 1.
This patch maintains the current behavior (show "nothing to rebase") even if
part of the "--base" revset could be rebased. A clearer error message may be
"cannot find branching point for X", or "X is a descendant of destination".
The error message issue is tracked by issue5422 separately.
A test is added with all kinds of tricky cases I could think of for now.
Check that renames are correctly saved by a commit after a merge
Test with the merge on 3 having the rename on the local parent
$ hg init a
$ cd a
$ echo line1 > foo
$ hg add foo
$ hg ci -m '0: add foo'
$ echo line2 >> foo
$ hg ci -m '1: change foo'
$ hg up -C 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg mv foo bar
$ rm bar
$ echo line0 > bar
$ echo line1 >> bar
$ hg ci -m '2: mv foo bar; change bar'
created new head
$ hg merge 1
merging bar and foo to bar
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat bar
line0
line1
line2
$ hg ci -m '3: merge with local rename'
$ hg debugindex bar
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 77 ..... 2 d35118874825 000000000000 000000000000 (re)
1 77 76 ..... 3 5345f5ab8abd 000000000000 d35118874825 (re)
$ hg debugrename bar
bar renamed from foo:9e25c27b87571a1edee5ae4dddee5687746cc8e2
$ hg debugindex foo
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 7 ..... 0 690b295714ae 000000000000 000000000000 (re)
1 7 13 ..... 1 9e25c27b8757 690b295714ae 000000000000 (re)
Revert the content change from rev 2:
$ hg up -C 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
$ echo line1 > bar
$ hg ci -m '4: revert content change from rev 2'
created new head
$ hg log --template '{rev}:{node|short} {parents}\n'
4:2263c1be0967 2:0f2ff26688b9
3:0555950ead28 2:0f2ff26688b9 1:5cd961e4045d
2:0f2ff26688b9 0:2665aaee66e9
1:5cd961e4045d
0:2665aaee66e9
This should use bar@rev2 as the ancestor:
$ hg --debug merge 3
searching for copies back to rev 1
resolving manifests
branchmerge: True, force: False, partial: False
ancestor: 0f2ff26688b9, local: 2263c1be0967+, remote: 0555950ead28
preserving bar for resolve of bar
starting 4 threads for background file closing (?)
bar: versions differ -> m (premerge)
picked tool ':merge' for bar (binary False symlink False changedelete False)
merging bar
my bar@2263c1be0967+ other bar@0555950ead28 ancestor bar@0f2ff26688b9
premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat bar
line1
line2
$ hg ci -m '5: merge'
$ hg debugindex bar
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 77 ..... 2 d35118874825 000000000000 000000000000 (re)
1 77 76 ..... 3 5345f5ab8abd 000000000000 d35118874825 (re)
2 153 7 ..... 4 ff4b45017382 d35118874825 000000000000 (re)
3 160 13 ..... 5 3701b4893544 ff4b45017382 5345f5ab8abd (re)
Same thing, but with the merge on 3 having the rename
on the remote parent:
$ cd ..
$ hg clone -U -r 1 -r 2 a b
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 2 files (+1 heads)
$ cd b
$ hg up -C 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 2
merging foo and bar to bar
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat bar
line0
line1
line2
$ hg ci -m '3: merge with remote rename'
$ hg debugindex bar
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 77 ..... 2 d35118874825 000000000000 000000000000 (re)
1 77 76 ..... 3 5345f5ab8abd 000000000000 d35118874825 (re)
$ hg debugrename bar
bar renamed from foo:9e25c27b87571a1edee5ae4dddee5687746cc8e2
$ hg debugindex foo
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 7 ..... 0 690b295714ae 000000000000 000000000000 (re)
1 7 13 ..... 1 9e25c27b8757 690b295714ae 000000000000 (re)
Revert the content change from rev 2:
$ hg up -C 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm bar
$ echo line1 > bar
$ hg ci -m '4: revert content change from rev 2'
created new head
$ hg log --template '{rev}:{node|short} {parents}\n'
4:2263c1be0967 2:0f2ff26688b9
3:3ffa6b9e35f0 1:5cd961e4045d 2:0f2ff26688b9
2:0f2ff26688b9 0:2665aaee66e9
1:5cd961e4045d
0:2665aaee66e9
This should use bar@rev2 as the ancestor:
$ hg --debug merge 3
searching for copies back to rev 1
resolving manifests
branchmerge: True, force: False, partial: False
ancestor: 0f2ff26688b9, local: 2263c1be0967+, remote: 3ffa6b9e35f0
preserving bar for resolve of bar
starting 4 threads for background file closing (?)
bar: versions differ -> m (premerge)
picked tool ':merge' for bar (binary False symlink False changedelete False)
merging bar
my bar@2263c1be0967+ other bar@3ffa6b9e35f0 ancestor bar@0f2ff26688b9
premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat bar
line1
line2
$ hg ci -m '5: merge'
$ hg debugindex bar
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 77 ..... 2 d35118874825 000000000000 000000000000 (re)
1 77 76 ..... 3 5345f5ab8abd 000000000000 d35118874825 (re)
2 153 7 ..... 4 ff4b45017382 d35118874825 000000000000 (re)
3 160 13 ..... 5 3701b4893544 ff4b45017382 5345f5ab8abd (re)
$ cd ..