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.
$ cat >> $HGRCPATH <<EOF
> [alias]
> tlog = log --template "{rev}:{node|short}: '{desc}' {branches}\n"
> tglog = tlog -G
> tout = out --template "{rev}:{node|short}: '{desc}' {branches}\n"
> EOF
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Aqm0
$ echo foo >> a
$ hg ci -Aqm1
$ hg up -q 0
$ hg branch stable
marked working directory as branch stable
(branches are permanent and global, did you want a bookmark?)
$ echo bar >> a
$ hg ci -qm2
$ hg tglog
@ 2:7bee6c3bea3a: '2' stable
|
| o 1:3560197d8331: '1'
|/
o 0:f7b1eb17ad24: '0'
$ cd ..
$ hg clone -q a#stable b
$ cd b
$ cat .hg/hgrc
# example repository config (see 'hg help config' for more info)
[paths]
default = $TESTTMP/a#stable
# path aliases to other clones of this repo in URLs or filesystem paths
# (see 'hg help config.paths' for more info)
#
# default:pushurl = ssh://jdoe@example.net/hg/jdoes-fork
# my-fork = ssh://jdoe@example.net/hg/jdoes-fork
# my-clone = /home/jdoe/jdoes-clone
[ui]
# name and email (local to this repository, optional), e.g.
# username = Jane Doe <jdoe@example.com>
$ echo red >> a
$ hg ci -qm3
$ hg up -q default
$ echo blue >> a
$ hg ci -qm4
$ hg tglog
@ 3:f0461977a3db: '4'
|
| o 2:1d4099801a4e: '3' stable
| |
| o 1:7bee6c3bea3a: '2' stable
|/
o 0:f7b1eb17ad24: '0'
$ hg tout
comparing with $TESTTMP/a
searching for changes
2:1d4099801a4e: '3' stable
$ hg tlog -r 'outgoing()'
2:1d4099801a4e: '3' stable
$ hg tout ../a#default
comparing with ../a
searching for changes
3:f0461977a3db: '4'
$ hg tlog -r 'outgoing("../a#default")'
3:f0461977a3db: '4'
$ echo "green = ../a#default" >> .hg/hgrc
$ cat .hg/hgrc
# example repository config (see 'hg help config' for more info)
[paths]
default = $TESTTMP/a#stable
# path aliases to other clones of this repo in URLs or filesystem paths
# (see 'hg help config.paths' for more info)
#
# default:pushurl = ssh://jdoe@example.net/hg/jdoes-fork
# my-fork = ssh://jdoe@example.net/hg/jdoes-fork
# my-clone = /home/jdoe/jdoes-clone
[ui]
# name and email (local to this repository, optional), e.g.
# username = Jane Doe <jdoe@example.com>
green = ../a#default
$ hg tout green
abort: repository green does not exist
[255]
$ hg tlog -r 'outgoing("green")'
abort: repository green does not exist
[255]
$ cd ..