view tests/test-purge @ 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

cat <<EOF >> $HGRCPATH
[extensions]
purge =
EOF

echo % init
hg init t
cd t

echo % setup
echo r1 > r1
hg ci -qAmr1 -d'0 0'
mkdir directory
echo r2 > directory/r2
hg ci -qAmr2 -d'1 0'
echo 'ignored' > .hgignore
hg ci -qAmr3 -d'2 0'

echo % delete an empty directory
mkdir empty_dir
hg purge -p
hg purge -v
ls

echo % delete an untracked directory
mkdir untracked_dir
touch untracked_dir/untracked_file1
touch untracked_dir/untracked_file2
hg purge -p
hg purge -v
ls

echo % delete an untracked file
touch untracked_file
touch untracked_file_readonly
python <<EOF
import os, stat
f= 'untracked_file_readonly'
os.chmod(f, stat.S_IMODE(os.stat(f).st_mode) & ~stat.S_IWRITE)
EOF
hg purge -p
hg purge -v
ls

echo % delete an untracked file in a tracked directory
touch directory/untracked_file
hg purge -p
hg purge -v
ls

echo % delete nested directories
mkdir -p untracked_directory/nested_directory
hg purge -p
hg purge -v
ls

echo % delete nested directories from a subdir
mkdir -p untracked_directory/nested_directory
cd directory
hg purge -p
hg purge -v
cd ..
ls

echo % delete only part of the tree
mkdir -p untracked_directory/nested_directory
touch directory/untracked_file
cd directory
hg purge -p ../untracked_directory
hg purge -v ../untracked_directory
cd ..
ls
ls directory/untracked_file
rm directory/untracked_file

echo % skip ignored files if --all not specified
touch ignored
hg purge -p
hg purge -v
ls
hg purge -p --all
hg purge -v --all
ls

echo % abort with missing files until we support name mangling filesystems
touch untracked_file
rm r1
# hide error messages to avoid changing the output when the text changes
hg purge -p 2> /dev/null
hg st

hg purge -p
hg purge -v 2> /dev/null
hg st

hg purge -v
hg revert --all --quiet
hg st -a

echo '% tracked file in ignored directory (issue621)'
echo directory >> .hgignore
hg ci -m 'ignore directory'
touch untracked_file
hg purge -p
hg purge -v

echo % skip excluded files
touch excluded_file
hg purge -p -X excluded_file
hg purge -v -X excluded_file
ls
rm excluded_file

echo % skip files in excluded dirs
mkdir excluded_dir
touch excluded_dir/file
hg purge -p -X excluded_dir
hg purge -v -X excluded_dir
ls
ls excluded_dir
rm -R excluded_dir

echo % skip excluded empty dirs
mkdir excluded_dir
hg purge -p -X excluded_dir
hg purge -v -X excluded_dir
ls
rmdir excluded_dir

echo % skip patterns
mkdir .svn
touch .svn/foo
mkdir directory/.svn
touch directory/.svn/foo
hg purge -p -X .svn -X '*/.svn'
hg purge -p -X re:.*.svn