view tests/test-extdiff @ 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

echo "[extensions]" >> $HGRCPATH
echo "extdiff=" >> $HGRCPATH

hg init a
cd a
echo a > a
echo b > b
hg add
# should diff cloned directories
hg extdiff -o -r $opt

echo "[extdiff]" >> $HGRCPATH
echo "cmd.falabala=echo" >> $HGRCPATH
echo "opts.falabala=diffing" >> $HGRCPATH

hg falabala

hg help falabala

hg ci -d '0 0' -mtest1

echo b >> a
hg ci -d '1 0' -mtest2

# should diff cloned files directly
hg falabala -r 0:1

# test diff during merge
hg update -C 0
echo c >> c
hg add c
hg ci -m "new branch" -d '1 0'
hg merge 1
# should diff cloned file against wc file
hg falabala > out
# cleanup the output since the wc is a tmp directory
sed  's:\(diffing [^ ]* \).*\(\/test-extdiff\):\1[tmp]\2:' out
# test --change option
hg ci -d '2 0' -mtest3
hg falabala -c 1
# check diff are made from the first parent
hg falabala -c 3 || echo "diff-like tools yield a non-zero exit code"
#hg log

echo
echo '% test extdiff of multiple files in tmp dir:'
hg update -C 0 > /dev/null
echo changed > a
echo changed > b
chmod +x b
echo '% diff in working directory, before'
hg diff --git
echo '% edit with extdiff -p'
# prepare custom diff/edit tool
cat > 'diff tool.py' << EOT
#!/usr/bin/env python
import time
time.sleep(1) # avoid unchanged-timestamp problems
file('a/a', 'ab').write('edited\n')
file('a/b', 'ab').write('edited\n')
EOT
chmod +x 'diff tool.py'
hg extdiff -p "`pwd`/diff tool.py" # will change to /tmp/extdiff.TMP and populate directories a.TMP and a and start tool
echo '% diff in working directory, after'
hg diff --git

echo
echo % test extdiff with --option
hg extdiff -p echo -o this -c 1
hg falabala -o this -c 1
echo