view tests/test-status @ 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

hg init repo1
cd repo1
mkdir a b a/1 b/1 b/2
touch in_root a/in_a b/in_b a/1/in_a_1 b/1/in_b_1 b/2/in_b_2
echo "hg status in repo root:"
hg status
echo "hg status . in repo root:"
hg status .
for dir in a b a/1 b/1 b/2; do
    echo "hg status in $dir:"
    hg status --cwd "$dir"
    echo "hg status . in $dir:"
    hg status --cwd "$dir" .
    echo "hg status .. in $dir:"
    hg status --cwd "$dir" ..
done
cd ..

hg init repo2
cd repo2
touch modified removed deleted ignored
echo "^ignored$" > .hgignore
hg ci -A -m 'initial checkin' -d "1000000 0"
touch modified added unknown ignored
hg add added
hg remove removed
rm deleted
echo "hg status:"
hg status
echo "hg status modified added removed deleted unknown never-existed ignored:"
hg status modified added removed deleted unknown never-existed ignored
hg copy modified copied
echo "hg status -C:"
hg status -C
echo "hg status -A:"
hg status -A
echo "^ignoreddir$" > .hgignore
mkdir ignoreddir
touch ignoreddir/file
echo "hg status ignoreddir/file:"
hg status ignoreddir/file
echo "hg status -i ignoreddir/file:"
hg status -i ignoreddir/file
cd ..

# check 'status -q' and some combinations
hg init repo3
cd repo3
touch modified removed deleted ignored
echo "^ignored$" > .hgignore
hg commit -A -m 'initial checkin'
touch added unknown ignored
hg add added
echo "test" >> modified
hg remove removed
rm deleted
hg copy modified copied

# Run status with 2 different flags.
# Check if result is the same or different.
# If result is not as expected, raise error
assert() {
    hg status $1 > ../a
    hg status $2 > ../b
    out=`diff ../a ../b`
    if [ $? -ne 0 ]; then
        out=1
    else
        out=0
    fi
    if [ $3 -eq 0 ]; then
        df="same"
    else
        df="different"
    fi
    if [ $out -ne $3 ]; then
        echo "Error on $1 and $2, should be $df."
    fi
}

# assert flag1 flag2 [0-same | 1-different]
assert "-q" "-mard"      0
assert "-A" "-marduicC"  0
assert "-qA" "-mardcC"   0
assert "-qAui" "-A"      0
assert "-qAu" "-marducC" 0
assert "-qAi" "-mardicC" 0
assert "-qu" "-u"        0
assert "-q" "-u"         1
assert "-m" "-a"         1
assert "-r" "-d"         1
cd ..

hg init repo4
cd repo4
touch modified removed deleted
hg ci -q -A -m 'initial checkin' -d "1000000 0"
touch added unknown
hg add added
hg remove removed
rm deleted
echo x > modified
hg copy modified copied
hg ci -m 'test checkin' -d "1000001 0"
rm *
touch unrelated
hg ci -q -A -m 'unrelated checkin' -d "1000002 0"
echo "hg status --change 1:"
hg status --change 1
echo "hg status --change 1 unrelated:"
hg status --change 1 unrelated
echo "hg status -C --change 1 added modified copied removed deleted:"
hg status -C --change 1 added modified copied removed deleted
echo "hg status -A --change 1"
hg status -A --change 1