view tests/test-mq-strip.out @ 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%.

adding bar
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
changeset:   4:443431ffac4f
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

changeset:   3:65bd5f99a4a3
parent:      1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     d

changeset:   2:264128213d29
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     c

changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

changeset:   0:9ab35a2d17cb
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     a

0 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 4
changeset:   4:443431ffac4f
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% after update 4, strip 4
changeset:   3:65bd5f99a4a3
tag:         tip
parent:      1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     d

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 3
changeset:   4:443431ffac4f
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% after update 4, strip 3
changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

0 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 1, strip 4
changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

saved backup bundle to 
% after update 1, strip 4
changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 2
changeset:   4:443431ffac4f
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

saved backup bundle to 
% after update 4, strip 2
changeset:   3:443431ffac4f
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 1
changeset:   4:264128213d29
tag:         tip
parent:      1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     c

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% after update 4, strip 1
changeset:   0:9ab35a2d17cb
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     a

0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% before update null, strip 4
saved backup bundle to 
% after update null, strip 4
changeset:   4:264128213d29
tag:         tip
parent:      1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     c

changeset:   3:443431ffac4f
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     e

changeset:   2:65bd5f99a4a3
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     d

changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

changeset:   0:9ab35a2d17cb
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     a

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% before strip of merge parent
changeset:   2:65bd5f99a4a3
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     d

changeset:   4:264128213d29
tag:         tip
parent:      1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     c

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% after strip of merge parent
changeset:   1:ef3a871183d7
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     b

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% applied patches before strip
2.diff
3.diff
4.diff
% stripping revision in queue
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% applied patches after stripping rev in queue
2.diff
% stripping ancestor of queue
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to 
% applied patches after stripping ancestor of queue