view tests/test-mq-guards @ 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 "mq=" >> $HGRCPATH

hg init
hg qinit

echo x > x
hg ci -Ama

hg qnew a.patch
echo a > a
hg add a
hg qrefresh

hg qnew b.patch
echo b > b
hg add b
hg qrefresh

hg qnew c.patch
echo c > c
hg add c
hg qrefresh

hg qpop -a

echo % should fail
hg qguard does-not-exist.patch +bleh

echo % should fail
hg qguard +fail

hg qpush
echo % should guard a.patch
hg qguard +a
echo % should print +a
hg qguard
hg qpop

echo % should fail
hg qpush a.patch

hg qguard a.patch
echo % should push b.patch
hg qpush

hg qpop
echo % test selection of an empty guard
hg qselect ""
hg qselect a
echo % should push a.patch
hg qpush

hg qguard -- c.patch -a
echo % should print -a
hg qguard c.patch

echo % should skip c.patch
hg qpush -a
echo % should display b.patch
hg qtop

hg qguard -n c.patch
echo % should push c.patch
hg qpush -a

hg qpop -a
hg qselect -n
echo % should push all
hg qpush -a

hg qpop -a
hg qguard a.patch +1
hg qguard b.patch +2
hg qselect 1
echo % should push a.patch, not b.patch
hg qpush
hg qpush
hg qpop -a

hg qselect 2
echo % should push b.patch
hg qpush
hg qpush -a
# Used to be an issue with holes in the patch sequence
# So, put one hole on the base and ask for topmost patch.
hg qtop
hg qpop -a

hg qselect 1 2
echo % should push a.patch, b.patch
hg qpush
hg qpush
hg qpop -a

hg qguard -- a.patch +1 +2 -3
hg qselect 1 2 3
echo % list patches and guards
hg qguard -l
echo % list patches and guards with color
hg --config extensions.color= qguard --config color.mode=ansi \
    -l --color=always
echo % list series
hg qseries -v
echo % list guards
hg qselect
echo % should push b.patch
hg qpush

hg qpush -a
hg qselect -n --reapply
echo % guards in series file: +1 +2 -3
hg qselect -s
echo % should show c.patch
hg qapplied

hg qrename a.patch new.patch
echo % should show :
echo % new.patch: +1 +2 -3
echo % b.patch: +2
echo % c.patch: unguarded
hg qguard -l

hg qnew d.patch
hg qpop
echo % should show new.patch and b.patch as Guarded, c.patch as Applied
echo % and d.patch as Unapplied
hg qseries -v
echo % qseries again, but with color
hg --config extensions.color= qseries -v --color=always

hg qguard d.patch +2
echo % new.patch, b.patch: Guarded. c.patch: Applied. d.patch: Guarded.
hg qseries -v

qappunappv()
{
    for command in qapplied "qapplied -v" qunapplied "qunapplied -v"; do
        echo % hg $command
        hg $command
    done
}

hg qpop -a
hg qguard -l
qappunappv
hg qselect 1
qappunappv
hg qpush -a
qappunappv
hg qselect 2
qappunappv

for patch in `hg qseries`; do
    echo % hg qapplied $patch
    hg qapplied $patch
    echo % hg qunapplied $patch
    hg qunapplied $patch
done

echo % hg qseries -m: only b.patch should be shown
echo the guards file was not ignored in the past
hg qdelete -k b.patch
hg qseries -m
echo % hg qseries -m with color
hg --config extensions.color= qseries -m --color=always