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.
$ hg init repo
$ cd repo
$ echo 0 > a
$ echo 0 > b
$ hg ci -A -m m
adding a
adding b
$ hg rm a
$ hg cat a
0
$ hg cat --decode a # more tests in test-encode
0
$ echo 1 > b
$ hg ci -m m
$ echo 2 > b
$ hg cat -r 0 a
0
$ hg cat -r 0 b
0
$ hg cat -r 1 a
a: no such file in rev 7040230c159c
[1]
$ hg cat -r 1 b
1
Test multiple files
$ echo 3 > c
$ hg ci -Am addmore c
$ hg cat b c
1
3
$ hg cat .
1
3
$ hg cat . c
1
3
Test fileset
$ hg cat 'set:not(b) or a'
3
$ hg cat 'set:c or b'
1
3
$ mkdir tmp
$ hg cat --output tmp/HH_%H c
$ hg cat --output tmp/RR_%R c
$ hg cat --output tmp/h_%h c
$ hg cat --output tmp/r_%r c
$ hg cat --output tmp/%s_s c
$ hg cat --output tmp/%d%%_d c
$ hg cat --output tmp/%p_p c
$ hg log -r . --template "{rev}: {node|short}\n"
2: 45116003780e
$ find tmp -type f | sort
tmp/.%_d
tmp/HH_45116003780e3678b333fb2c99fa7d559c8457e9
tmp/RR_2
tmp/c_p
tmp/c_s
tmp/h_45116003780e
tmp/r_2
Test template output
$ hg --cwd tmp cat ../b ../c -T '== {path|relpath} ({path}) r{rev} ==\n{data}'
== ../b (b) r2 ==
1
== ../c (c) r2 ==
3
$ hg cat b c -Tjson --output -
[
{
"data": "1\n",
"path": "b"
},
{
"data": "3\n",
"path": "c"
}
]
$ hg cat b c -Tjson --output 'tmp/%p.json'
$ cat tmp/b.json
[
{
"data": "1\n",
"path": "b"
}
]
$ cat tmp/c.json
[
{
"data": "3\n",
"path": "c"
}
]
Test working directory
$ echo b-wdir > b
$ hg cat -r 'wdir()' b
b-wdir
Environment variables are not visible by default
$ PATTERN='t4' hg log -r '.' -T "{ifcontains('PATTERN', envvars, 'yes', 'no')}\n"
no
Environment variable visibility can be explicit
$ PATTERN='t4' hg log -r '.' -T "{envvars % '{key} -> {value}\n'}" \
> --config "experimental.exportableenviron=PATTERN"
PATTERN -> t4
Test behavior of output when directory structure does not already exist
$ mkdir foo
$ echo a > foo/a
$ hg add foo/a
$ hg commit -qm "add foo/a"
$ hg cat --output "output/%p" foo/a
$ cat output/foo/a
a