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.
Check that the pull logger plugins logs pulls
=============================================
Enable the extension
$ echo "[extensions]" >> $HGRCPATH
$ echo "pull-logger = $TESTDIR/../contrib/pull_logger.py" >> $HGRCPATH
Check the format of the generated log entries, with a bunch of elements in the
common and heads set
$ hg init server
$ hg -R server debugbuilddag '.*2+2'
$ hg clone ssh://user@dummy/server client --rev 0
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files
new changesets 1ea73414a91b
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ tail -1 server/.hg/pull_log.jsonl
{"common": ["0000000000000000000000000000000000000000"], "heads": ["1ea73414a91b0920940797d8fc6a11e447f8ea1e"], "logger_version": 0, "timestamp": *} (glob)
$ hg -R client pull --rev 1 --rev 2
pulling from ssh://user@dummy/server
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 0 changes to 0 files (+1 heads)
new changesets d8736c3a2c84:fa28e81e283b
(run 'hg heads' to see heads, 'hg merge' to merge)
$ tail -1 server/.hg/pull_log.jsonl
{"common": ["1ea73414a91b0920940797d8fc6a11e447f8ea1e"], "heads": ["d8736c3a2c84ee759a2821385804bcb67f266ade", "fa28e81e283b3416de4d48ee0dd2d446e9e38d7c"], "logger_version": 0, "timestamp": *} (glob)
$ hg -R client pull --rev 2 --rev 3
pulling from ssh://user@dummy/server
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files
new changesets 944641ddcaef
(run 'hg update' to get a working copy)
$ tail -1 server/.hg/pull_log.jsonl
{"common": ["1ea73414a91b0920940797d8fc6a11e447f8ea1e", "fa28e81e283b3416de4d48ee0dd2d446e9e38d7c"], "heads": ["944641ddcaef174df7ce1bc2751a5f165129778b", "fa28e81e283b3416de4d48ee0dd2d446e9e38d7c"], "logger_version": 0, "timestamp": *} (glob)
Check the number of entries generated in the log when pulling from multiple
clients at the same time
$ rm -f server/.hg/pull_log.jsonl
$ for i in $($TESTDIR/seq.py 32); do
> hg clone ssh://user@dummy/server client_$i --rev 0
> done > /dev/null
$ for i in $($TESTDIR/seq.py 32); do
> hg -R client_$i pull --rev 1 &
> done > /dev/null
$ wait
$ wc -l server/.hg/pull_log.jsonl
\s*64 .* (re)
Test log rotation when reaching some size threshold
$ cat >> $HGRCPATH << EOF
> [pull-logger]
> rotate-size = 1kb
> EOF
$ rm -f server/.hg/pull_log.jsonl
$ for i in $($TESTDIR/seq.py 10); do
> hg -R client pull --rev 1
> done > /dev/null
$ wc -l server/.hg/pull_log.jsonl
\s*3 .* (re)
$ wc -l server/.hg/pull_log.jsonl.rotated
\s*7 .* (re)