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.
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