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.
#testcases flat tree
#testcases lfs-on lfs-off
#if lfs-on
$ cat >> $HGRCPATH <<EOF
> [extensions]
> lfs =
> EOF
#endif
$ . "$TESTDIR/narrow-library.sh"
#if tree
$ cat << EOF >> $HGRCPATH
> [experimental]
> treemanifest = 1
> EOF
#endif
create full repo
$ hg init master
$ cd master
$ cat >> .hg/hgrc <<EOF
> [narrow]
> serveellipses=True
> EOF
$ mkdir inside
$ echo inside > inside/f1
$ mkdir outside
$ echo outside > outside/f1
$ hg ci -Aqm 'initial'
$ echo modified > inside/f1
$ hg ci -qm 'modify inside'
$ hg co -q 0
$ echo modified > outside/f1
$ hg ci -qm 'modify outside'
$ echo modified again >> outside/f1
$ hg ci -qm 'modify outside again'
$ cd ..
$ hg clone --narrow ssh://user@dummy/master narrow --include inside
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 1 files (+1 heads)
new changesets *:* (glob)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
$ cat >> $HGRCPATH <<EOF
> [extensions]
> strip=
> EOF
Can strip and recover changesets affecting only files within narrow spec
$ hg co -r 'desc("modify inside")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm -f .hg/strip-backup/*-backup.hg
$ hg strip .
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-backup.hg (glob)
$ hg unbundle .hg/strip-backup/*-backup.hg
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets * (glob)
(run 'hg heads' to see heads, 'hg merge' to merge)
Can strip and recover changesets affecting files outside of narrow spec
$ hg co -r 'desc("modify outside")'
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg log -G -T '{rev} {desc}\n'
o 2 modify inside
|
| @ 1 modify outside again
|/
o 0 initial
$ hg debugdata -m 1
inside/f1\x004d6a634d5ba06331a60c29ee0db8412490a54fcd (esc) (flat !)
outside/f1\x0084ba604d54dee1f13310ce3d4ac2e8a36636691a (esc) (flat !)
inside\x006a8bc41df94075d501f9740587a0c0e13c170dc5t (esc) (tree !)
outside\x00255c2627ebdd3c7dcaa6945246f9b9f02bd45a09t (esc) (tree !)
$ rm -f .hg/strip-backup/*-backup.hg
$ hg strip .
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-backup.hg (glob)
$ hg unbundle .hg/strip-backup/*-backup.hg
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files (+1 heads)
new changesets * (glob)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg log -G -T '{rev} {desc}\n'
o 2 modify outside again
|
| o 1 modify inside
|/
@ 0 initial
Check that hash of file outside narrow spec got restored
$ hg debugdata -m 2
inside/f1\x004d6a634d5ba06331a60c29ee0db8412490a54fcd (esc) (flat !)
outside/f1\x0084ba604d54dee1f13310ce3d4ac2e8a36636691a (esc) (flat !)
inside\x006a8bc41df94075d501f9740587a0c0e13c170dc5t (esc) (tree !)
outside\x00255c2627ebdd3c7dcaa6945246f9b9f02bd45a09t (esc) (tree !)
Also verify we can apply the bundle with 'hg pull':
$ hg co -r 'desc("modify inside")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ rm .hg/strip-backup/*-backup.hg
$ hg strip .
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-backup.hg (glob)
#if repobundlerepo
$ hg pull .hg/strip-backup/*-backup.hg
pulling from .hg/strip-backup/*-backup.hg (glob)
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets * (glob)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ rm .hg/strip-backup/*-backup.hg
$ hg strip 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/narrow/.hg/strip-backup/*-backup.hg (glob)
$ hg incoming .hg/strip-backup/*-backup.hg
comparing with .hg/strip-backup/*-backup.hg (glob)
changeset: 0:* (glob)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: initial
changeset: 1:9e48d953700d (flat !)
changeset: 1:3888164bccf0 (tree !)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify outside again
changeset: 2:f505d5e96aa8 (flat !)
changeset: 2:40b66f95a209 (tree !)
tag: tip
parent: 0:a99f4d53924d (flat !)
parent: 0:c2a5fabcca3c (tree !)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify inside
$ hg pull .hg/strip-backup/*-backup.hg
pulling from .hg/strip-backup/*-backup.hg (glob)
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 1 files (+1 heads)
new changesets *:* (glob)
(run 'hg heads' to see heads, 'hg merge' to merge)
#endif