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.
test sparse with --verbose and -T json
$ hg init myrepo
$ cd myrepo
$ cat > .hg/hgrc <<EOF
> [extensions]
> sparse=
> strip=
> EOF
$ echo a > show
$ echo x > hide
$ hg ci -Aqm 'initial'
$ echo b > show
$ echo y > hide
$ echo aa > show2
$ echo xx > hide2
$ hg ci -Aqm 'two'
Verify basic --include and --reset
$ hg up -q 0
$ hg debugsparse --include 'hide' -Tjson
[
{
"exclude_rules_added": 0,
"files_added": 0,
"files_conflicting": 0,
"files_dropped": 1,
"include_rules_added": 1,
"profiles_added": 0
}
]
$ hg debugsparse --clear-rules
$ hg debugsparse --include 'hide' --verbose
removing show
Profiles changed: 0
Include rules changed: 1
Exclude rules changed: 0
$ hg debugsparse --reset -Tjson
[
{
"exclude_rules_added": 0,
"files_added": 1,
"files_conflicting": 0,
"files_dropped": 0,
"include_rules_added": -1,
"profiles_added": 0
}
]
$ hg debugsparse --include 'hide'
$ hg debugsparse --reset --verbose
getting show
Profiles changed: 0
Include rules changed: -1
Exclude rules changed: 0
Verifying that problematic files still allow us to see the deltas when forcing:
$ hg debugsparse --include 'show*'
$ touch hide
$ hg debugsparse --delete 'show*' --force -Tjson
pending changes to 'hide'
[
{
"exclude_rules_added": 0,
"files_added": 0,
"files_conflicting": 1,
"files_dropped": 0,
"include_rules_added": -1,
"profiles_added": 0
}
]
$ hg debugsparse --include 'show*' --force
pending changes to 'hide'
$ hg debugsparse --delete 'show*' --force --verbose
pending changes to 'hide'
Profiles changed: 0
Include rules changed: -1
Exclude rules changed: 0