branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
$ hg init repo
$ cd repo
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg update 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #2"
created new head
$ hg merge 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ rm b
$ echo This is file c22 > c
Test hg behaves when committing with a missing file added by a merge
$ hg commit -m "commit #3"
abort: cannot commit merge with missing files
[255]
Test conflict*() revsets
# Bad usage
$ hg log -r 'conflictlocal(foo)'
hg: parse error: conflictlocal takes no arguments
[10]
$ hg log -r 'conflictother(foo)'
hg: parse error: conflictother takes no arguments
[10]
$ hg co -C .
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
# No merge parents when not merging
$ hg log -r 'conflictlocal() + conflictother()'
# No merge parents when there is no conflict
$ hg merge 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg log -r 'conflictlocal() + conflictother()'
$ hg co -C .
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo conflict > b
$ hg ci -Aqm 'conflicting change to b'
$ hg merge 1
merging b
warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
[1]
# Shows merge parents when there is a conflict
$ hg log -r 'conflictlocal()' -T '{rev} {desc}\n'
3 conflicting change to b
$ hg log -r 'conflictother()' -T '{rev} {desc}\n'
1 commit #1