annotate tests/test-issue672.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 1
adding 2
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
  searching for copies back to rev 1
  unmatched files in other:
   1a
  all copies found (* = to merge, ! = divergent):
   1a -> 1 
  checking for directory renames
resolving manifests
 overwrite None partial False
 ancestor 81f4b099af3d local c64f439569a9+ remote c12dcd37c90a
 1: other deleted -> r
 1a: remote created -> g
updating: 1 1/2 files (50.00%)
removing 1
updating: 1a 2/2 files (100.00%)
getting 1a
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  searching for copies back to rev 1
  unmatched files in local:
   1a
  all copies found (* = to merge, ! = divergent):
   1a -> 1 *
  checking for directory renames
resolving manifests
 overwrite None partial False
 ancestor c64f439569a9 local e327dca35ac8+ remote 746e9549ea96
 1a: local copied/moved to 1 -> m
preserving 1a for resolve of 1a
updating: 1a 1/1 files (100.00%)
picked tool 'internal:merge' for 1a (binary False symlink False)
merging 1a and 1 to 1a
my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@81f4b099af3d
 premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  searching for copies back to rev 1
  unmatched files in other:
   1a
  all copies found (* = to merge, ! = divergent):
   1a -> 1 *
  checking for directory renames
resolving manifests
 overwrite None partial False
 ancestor c64f439569a9 local 746e9549ea96+ remote e327dca35ac8
 1: remote moved to 1a -> m
preserving 1 for resolve of 1a
removing 1
updating: 1 1/1 files (100.00%)
picked tool 'internal:merge' for 1a (binary False symlink False)
merging 1 and 1a to 1a
my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@81f4b099af3d
 premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)