annotate tests/test-subrepo-svn @ 11769:ca6cebd8734e stable

dirstate: ignore symlinks when fs cannot handle them (issue1888)

When the filesystem cannot handle the executable bit, we currently
ignore it completely when looking for modified files. Similarly, it is
impossible to set or clear the bit when the filesystem ignores it.

This patch makes Mercurial treat symbolic links the same way.

Symlinks are a little different since they manifest themselves as
small files containing a filename (the symlink target). On Windows,
these files show up as regular files, and on Linux and Mac they show
up as real symlinks.

Issue1888 presents a case where the symlink files are better ignored
from the Windows side. A Linux client creates symlinks in a working
copy which is shared over a network between Linux and Windows clients.

The Samba server is helpful and defererences the symlink when the
Windows client looks at it. This means that Mercurial on the Windows
side sees file content instead of a file name in the symlink, and
hence flags the link as modified. Ignoring the change would be much
more helpful, similarly to how Mercurial does not report any changes
when executable bits are ignored in a checkout on Windows.

An initial checkout of a symbolic link on a file system that cannot
handle symbolic links will still result in a regular file containing
the target file name as its content. Sharing such a checkout with a
Linux client will not turn the file into a symlink automatically, but
'hg revert' can fix that. After the revert, the Windows client will
see the correct file content (provided by the Samba server when it
follows the link on the Linux side) and otherwise ignore the change.

Running 'hg perfstatus' 10 times gives these results:

  Before:          After:
  min: 0.544703    min: 0.546549
  med: 0.547592    med: 0.548881
  avg: 0.549146    avg: 0.548549
  max: 0.564112    max: 0.551504

The median time is increased about 0.24%.

#!/bin/sh

"$TESTDIR/hghave" svn || exit 80

fix_path()
{
    tr '\\' /
}

escapedwd=`pwd | fix_path`
# SVN wants all paths to start with a slash. Unfortunately,
# Windows ones don't. Handle that.
expr "$escapedwd" : "\/" > /dev/null
if [ $? -ne 0 ]; then
    escapedwd="/$escapedwd"
fi
escapedwd=`python -c "import urllib, sys; sys.stdout.write(urllib.quote(sys.argv[1]))" "$escapedwd"`
filterpath="s|$escapedwd|/root|"
filteroutofdate='s/ in transaction.*/ is out of date/;s/Out of date: /File /'
filterexternal="s|Fetching external item into '.*/s/externals'|Fetching external item into 's/externals'|g"

echo % create subversion repo

SVNREPO="file://$escapedwd/svn-repo"
WCROOT="`pwd`/svn-wc"
svnadmin create svn-repo
svn co "$SVNREPO" svn-wc
cd svn-wc
mkdir src
echo alpha > src/alpha
svn add src
mkdir externals
echo other > externals/other
svn add externals
svn ci -m 'Add alpha'
svn up
cat > extdef <<EOF
externals -r1 $SVNREPO/externals
EOF
svn propset -F extdef svn:externals src
svn ci -m 'Setting externals'
cd ..

echo % create hg repo
mkdir sub
cd sub
hg init t
cd t

echo % first revision, no sub
echo a > a
hg ci -Am0

echo % add first svn sub with leading whitespaces
echo "s = [svn]       $SVNREPO/src" >> .hgsub
svn co --quiet "$SVNREPO"/src s
hg add .hgsub
hg ci -m1
echo % debugsub
hg debugsub | sed "$filterpath"

echo
echo % change file in svn and hg, commit
echo a >> a
echo alpha >> s/alpha
hg commit -m 'Message!' | sed "$filterexternal" \
    | sed 's:Sending.*s/alpha:Sending        s/alpha:g'
hg debugsub | sed "$filterpath"

echo
echo a > s/a
echo % should be empty despite change to s/a
hg st

echo
echo % add a commit from svn
cd "$WCROOT"/src
svn up
echo xyz >> alpha
svn propset svn:mime-type 'text/xml' alpha
svn ci -m 'amend a from svn'
cd ../../sub/t

echo % this commit from hg will fail
echo zzz >> s/alpha
hg ci -m 'amend alpha from hg' 2>&1 | sed "$filteroutofdate"
svn revert -q s/alpha

echo % this commit fails because of meta changes
svn propset svn:mime-type 'text/html' s/alpha
hg ci -m 'amend alpha from hg' 2>&1 | sed "$filteroutofdate"
svn revert -q s/alpha

echo % this commit fails because of externals changes
echo zzz > s/externals/other
hg ci -m 'amend externals from hg'
svn revert -q s/externals/other

echo % this commit fails because of externals meta changes
svn propset svn:mime-type 'text/html' s/externals/other
hg ci -m 'amend externals from hg'
svn revert -q s/externals/other

echo
echo % clone
cd ..
hg clone t tc | fix_path
cd tc
echo % debugsub in clone
hg debugsub | sed "$filterpath"

echo % verify subrepo is contained within the repo directory
python -c "import os.path; print os.path.exists('s')"