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.
#require svn svn-bindings
$ cat >> $HGRCPATH <<EOF
> [extensions]
> convert =
> EOF
$ svnadmin create svn-repo
$ svnadmin load -q svn-repo < "$TESTDIR/svn/tags.svndump"
Convert
$ hg convert --datesort svn-repo A-hg
initializing destination A-hg repository
scanning source...
sorting...
converting...
5 init projA
4 adda
3 changea
2 changea2
1 changea3
0 changea
updating tags
$ cd A-hg
$ hg log -G --template '{rev} {desc|firstline} tags: {tags}\n'
o 6 update tags tags: tip
|
o 5 changea tags: trunk.goodtag
|
o 4 changea3 tags:
|
o 3 changea2 tags: trunk.v1
|
o 2 changea tags:
|
o 1 adda tags:
|
o 0 init projA tags:
$ hg tags -q
tip
trunk.goodtag
trunk.v1
$ cd ..
Convert without tags
$ hg convert --datesort --config convert.svn.tags= svn-repo A-notags-hg
initializing destination A-notags-hg repository
scanning source...
sorting...
converting...
5 init projA
4 adda
3 changea
2 changea2
1 changea3
0 changea
$ hg -R A-notags-hg tags -q
tip