Mercurial > hg
view tests/test-clone-uncompressed.t @ 30446:b324b4e431e5
posix: give checkexec a fast path; keep the check files and test read only
Before, Mercurial would create a new temporary file every time, stat it, change
its exec mode, stat it again, and delete it. Most of this dance was done to
handle the rare and not-so-essential case of VFAT mounts on unix. The cost of
that was paid by the much more common and important case of using normal file
systems.
Instead, try to create and preserve .hg/cache/checkisexec and
.hg/cache/checknoexec with and without exec flag set. If the files exist and
have correct exec flags set, we can conclude that that file system supports the
exec flag. Best case, the whole exec check can thus be done with two stat
calls. Worst case, we delete the wrong files and check as usual. That will be
because temporary loss of exec bit or on file systems without support for the
exec bit. In that case we check as we did before, with the additional overhead
of one extra stat call.
It is possible that this different test algorithm in some cases on odd file
systems will give different behaviour. Again, I think it will be rare and
special cases and I think it is worth the risk.
test-clone.t happens to show the situation where checkisexec is left behind
from the old style check, while checknoexec only will be created next time a
exec check will be performed.
author | Mads Kiilerich <madski@unity3d.com> |
---|---|
date | Wed, 14 Jan 2015 01:15:26 +0100 |
parents | 9dc27a334fb1 |
children | e7a35f18d91f |
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#require serve Initialize repository the status call is to check for issue5130 $ hg init server $ cd server $ touch foo $ hg -q commit -A -m initial >>> for i in range(1024): ... with open(str(i), 'wb') as fh: ... fh.write(str(i)) $ hg -q commit -A -m 'add a lot of files' $ hg st $ hg serve -p $HGPORT -d --pid-file=hg.pid $ cat hg.pid >> $DAEMON_PIDS $ cd .. Basic clone $ hg clone --uncompressed -U http://localhost:$HGPORT clone1 streaming all changes 1027 files to transfer, 96.3 KB of data transferred 96.3 KB in * seconds (*/sec) (glob) searching for changes no changes found Clone with background file closing enabled $ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --uncompressed -U http://localhost:$HGPORT clone-background | grep -v adding using http://localhost:$HGPORT/ sending capabilities command sending branchmap command streaming all changes sending stream_out command 1027 files to transfer, 96.3 KB of data starting 4 threads for background file closing transferred 96.3 KB in * seconds (*/sec) (glob) query 1; heads sending batch command searching for changes all remote heads known locally no changes found sending getbundle command bundle2-input-bundle: with-transaction bundle2-input-part: "listkeys" (params: 1 mandatory) supported bundle2-input-part: total payload size 58 bundle2-input-part: "listkeys" (params: 1 mandatory) supported bundle2-input-bundle: 1 parts total checking for updated bookmarks Stream clone while repo is changing: $ mkdir changing $ cd changing extension for delaying the server process so we reliably can modify the repo while cloning $ cat > delayer.py <<EOF > import time > from mercurial import extensions, scmutil > def __call__(orig, self, path, *args, **kwargs): > if path == 'data/f1.i': > time.sleep(2) > return orig(self, path, *args, **kwargs) > extensions.wrapfunction(scmutil.vfs, '__call__', __call__) > EOF prepare repo with small and big file to cover both code paths in emitrevlogdata $ hg init repo $ touch repo/f1 $ $TESTDIR/seq.py 50000 > repo/f2 $ hg -R repo ci -Aqm "0" $ hg -R repo serve -p $HGPORT1 -d --pid-file=hg.pid --config extensions.delayer=delayer.py $ cat hg.pid >> $DAEMON_PIDS clone while modifying the repo between stating file with write lock and actually serving file content $ hg clone -q --uncompressed -U http://localhost:$HGPORT1 clone & $ sleep 1 $ echo >> repo/f1 $ echo >> repo/f2 $ hg -R repo ci -m "1" $ wait $ hg -R clone id 000000000000