branchcache: skip entries that are topological heads in the on disk file
In the majority of cases, topological heads are also branch heads. We have
efficient way to get the topological heads and efficient way to retrieve
their branch information. So there is little value in putting them in the branch
cache file explicitly. On the contrary, writing them explicitly tend to create
very large cache file that are inefficient to read and update.
So the branch cache v3 format is no longer including them. This changeset focus
on the format aspect and have no focus on the performance aspect. We will cover
that later.
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"
> EOF
$ hg init a
$ cd a
$ echo c1 > c1
$ hg ci -Am c1
adding c1
$ echo c2 > c2
$ hg ci -Am c2
adding c2
$ echo l1 > l1
$ hg ci -Am l1
adding l1
$ hg up -q -C 1
$ echo r1 > r1
$ hg ci -Am r1
adding r1
created new head
$ echo r2 > r2
$ hg ci -Am r2
adding r2
$ hg tglog
@ 4: 225af64d03e6 'r2'
|
o 3: 8d0a8c99b309 'r1'
|
| o 2: 87c180a611f2 'l1'
|/
o 1: 56daeba07f4b 'c2'
|
o 0: e8faad3d03ff 'c1'
Rebase with no arguments - single revision in source branch:
$ hg up -q -C 2
$ hg rebase
rebasing 2:87c180a611f2 "l1"
saved backup bundle to $TESTTMP/a/.hg/strip-backup/87c180a611f2-a5be192d-rebase.hg
$ hg tglog
@ 4: b1152cc99655 'l1'
|
o 3: 225af64d03e6 'r2'
|
o 2: 8d0a8c99b309 'r1'
|
o 1: 56daeba07f4b 'c2'
|
o 0: e8faad3d03ff 'c1'
$ cd ..
$ hg init b
$ cd b
$ echo c1 > c1
$ hg ci -Am c1
adding c1
$ echo c2 > c2
$ hg ci -Am c2
adding c2
$ echo l1 > l1
$ hg ci -Am l1
adding l1
$ echo l2 > l2
$ hg ci -Am l2
adding l2
$ hg up -q -C 1
$ echo r1 > r1
$ hg ci -Am r1
adding r1
created new head
$ hg tglog
@ 4: 8d0a8c99b309 'r1'
|
| o 3: 1ac923b736ef 'l2'
| |
| o 2: 87c180a611f2 'l1'
|/
o 1: 56daeba07f4b 'c2'
|
o 0: e8faad3d03ff 'c1'
Rebase with no arguments - single revision in target branch:
$ hg up -q -C 3
$ hg rebase
rebasing 2:87c180a611f2 "l1"
rebasing 3:1ac923b736ef "l2"
saved backup bundle to $TESTTMP/b/.hg/strip-backup/87c180a611f2-b980535c-rebase.hg
$ hg tglog
@ 4: 023181307ed0 'l2'
|
o 3: 913ab52b43b4 'l1'
|
o 2: 8d0a8c99b309 'r1'
|
o 1: 56daeba07f4b 'c2'
|
o 0: e8faad3d03ff 'c1'
$ cd ..