push: rework the computation of fallbackheads to be correct
The previous computation tried to be smart but ended up being wrong. This was
caught by phase movement test while reworking the phase discovery logic to be
faster.
The previous logic was failing to catch case where the pushed set was not based
on a common heads (i.e. when the discovery seemed to have "over discovered"
content, outside the pushed set)
In the following graph, `e` is a common head and we `hg push -r f`. We need to
detect `c` as a fallback heads and we previous failed to do so::
e
|
d f
|/
c
|
b
|
a
The performance impact of the change seems minimal. On the most impacted
repository at hand (mozilla-try), the slowdown seems mostly mixed in the
overall noise `hg push` but seems to be in the hundred of milliseconds order of
magnitude. When using rust, we seems to be a bit faster, probably because we
leverage more accelaratd internals.
I added a couple of performance related common for further investigation later
on.
#require serve symlink
Tests whether or not hgwebdir properly handles various symlink topologies.
hide outer repo
$ hg init
$ hg init a
$ echo a > a/a
$ hg --cwd a ci -Ama -d'1 0'
adding a
$ mkdir webdir
$ cd webdir
$ hg init b
$ echo b > b/b
$ hg --cwd b ci -Amb -d'2 0'
adding b
$ hg init c
$ echo c > c/c
$ hg --cwd c ci -Amc -d'3 0'
adding c
$ ln -s ../a al
$ ln -s ../webdir circle
$ root=`pwd`
$ cd ..
$ cat > collections.conf <<EOF
> [collections]
> $root=$root
> EOF
$ hg serve -p $HGPORT -d --pid-file=hg.pid --webdir-conf collections.conf \
> -A access-collections.log -E error-collections.log
$ cat hg.pid >> $DAEMON_PIDS
should succeed
$ get-with-headers.py localhost:$HGPORT '?style=raw'
200 Script output follows
/al/
/b/
/c/
$ get-with-headers.py localhost:$HGPORT 'al/file/tip/a?style=raw'
200 Script output follows
a
$ get-with-headers.py localhost:$HGPORT 'b/file/tip/b?style=raw'
200 Script output follows
b
$ get-with-headers.py localhost:$HGPORT 'c/file/tip/c?style=raw'
200 Script output follows
c
should fail
$ get-with-headers.py localhost:$HGPORT 'circle/al/file/tip/a?style=raw'
404 Not Found
error: repository circle/al/file/tip/a not found
[1]
$ get-with-headers.py localhost:$HGPORT 'circle/b/file/tip/a?style=raw'
404 Not Found
error: repository circle/b/file/tip/a not found
[1]
$ get-with-headers.py localhost:$HGPORT 'circle/c/file/tip/a?style=raw'
404 Not Found
error: repository circle/c/file/tip/a not found
[1]
collections errors
$ cat error-collections.log