Mercurial > hg
view tests/test-relink.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 | bd625cd4e5e7 |
children | 75be14993fda |
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#require hardlink $ echo "[extensions]" >> $HGRCPATH $ echo "relink=" >> $HGRCPATH $ fix_path() { > tr '\\' / > } $ cat > arelinked.py <<EOF > import sys, os > from mercurial import util > path1, path2 = sys.argv[1:3] > if util.samefile(path1, path2): > print '%s == %s' % (path1, path2) > else: > print '%s != %s' % (path1, path2) > EOF create source repository $ hg init repo $ cd repo $ echo a > a $ echo b > b $ hg ci -Am addfile adding a adding b $ cat "$TESTDIR/binfile.bin" >> a $ cat "$TESTDIR/binfile.bin" >> b $ hg ci -Am changefiles make another commit to create files larger than 1 KB to test formatting of final byte count $ cat "$TESTDIR/binfile.bin" >> a $ cat "$TESTDIR/binfile.bin" >> b $ hg ci -m anotherchange don't sit forever trying to double-lock the source repo $ hg relink . relinking $TESTTMP/repo/.hg/store to $TESTTMP/repo/.hg/store (glob) there is nothing to relink Test files are read in binary mode $ $PYTHON -c "file('.hg/store/data/dummy.i', 'wb').write('a\r\nb\n')" $ cd .. clone and pull to break links $ hg clone --pull -r0 repo clone adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd clone $ hg pull -q $ echo b >> b $ hg ci -m changeb created new head $ $PYTHON -c "file('.hg/store/data/dummy.i', 'wb').write('a\nb\r\n')" relink $ hg relink --debug --config progress.debug=true | fix_path relinking $TESTTMP/repo/.hg/store to $TESTTMP/clone/.hg/store tip has 2 files, estimated total number of files: 3 collecting: 00changelog.i 1/3 files (33.33%) collecting: 00manifest.i 2/3 files (66.67%) collecting: a.i 3/3 files (100.00%) collecting: b.i 4/3 files (133.33%) collecting: dummy.i 5/3 files (166.67%) collected 5 candidate storage files not linkable: 00changelog.i not linkable: 00manifest.i pruning: data/a.i 3/5 files (60.00%) not linkable: data/b.i pruning: data/dummy.i 5/5 files (100.00%) pruned down to 2 probably relinkable files relinking: data/a.i 1/2 files (50.00%) not linkable: data/dummy.i relinked 1 files (1.36 KB reclaimed) $ cd .. check hardlinks $ python arelinked.py repo/.hg/store/data/a.i clone/.hg/store/data/a.i repo/.hg/store/data/a.i == clone/.hg/store/data/a.i $ python arelinked.py repo/.hg/store/data/b.i clone/.hg/store/data/b.i repo/.hg/store/data/b.i != clone/.hg/store/data/b.i