view tests/test-tags.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%.

% setup
no tag cache
000000000000 tip
no tag cache
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
acb14030fe0a tip
tag cache exists
% create local tag with long name
tip                                0:acb14030fe0a
This is a local tag with a really long name!     0:acb14030fe0a
% create a tag behind hg's back
acb14030fe0a21b60322c440ad2d20cf7685a376 first
tip                                1:b9154636be93
first                              0:acb14030fe0a
b9154636be93 tip
% identify with cold cache
b9154636be93 tip
% identify with unwritable cache
b9154636be93 tip
% create a branch
M a
b9154636be93+ tip
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
acb14030fe0a+ first
acb14030fe0a+ first
M a
created new head
c8edf04160c7 tip
% merge the two heads
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
c8edf04160c7+b9154636be93+ tip
M .hgtags
% create fake head, make sure tag not visible afterwards
tip                                6:35ff301afafe
first                              0:acb14030fe0a
% add invalid tags
committing .hgtags:
acb14030fe0a21b60322c440ad2d20cf7685a376 first
spam

foo bar
% report tag parse error on other head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
.hgtags@75d9f02dfe28, line 2: cannot parse entry
.hgtags@75d9f02dfe28, line 4: node 'foo' is not well formed
.hgtags@c4be69a18c11, line 2: node 'x' is not well formed
tip                                8:c4be69a18c11
first                              0:acb14030fe0a
changeset:   8:c4be69a18c11
tag:         tip
parent:      3:ac5e980c4dc0
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     head

% test tag precedence rules
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
tip                                4:0c192d7d5e6b
bar                                1:78391a272241
tip                                4:0c192d7d5e6b
bar                                1:78391a272241
% detailed dump of tag info
heads:
4:0c192d7d5e6b
3:6fa450212aeb
2:7a94127795a3
rev 2: .hgtags:
bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar
rev 3: .hgtags:
bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar
bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar
78391a272241d70354aa14c874552cad6b51bb42 bar
rev 4: .hgtags:
bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar
.hg/tags.cache:
4 0c192d7d5e6b78a714de54a2e9627952a877e25a 0c04f2a8af31de17fab7422878ee5a2dadbc943d
3 6fa450212aeb2a21ed616a54aea39a4a27894cd7 7d3b718c964ef37b89e550ebdafd5789e76ce1b0
2 7a94127795a33c10a370c93f731fd9fea0b79af6 0c04f2a8af31de17fab7422878ee5a2dadbc943d

78391a272241d70354aa14c874552cad6b51bb42 bar
% test tag removal
changeset:   5:5f6e8655b1c7
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
files:       .hgtags
description:
Removed tag bar


diff -r 0c192d7d5e6b -r 5f6e8655b1c7 .hgtags
--- a/.hgtags	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgtags	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +1,3 @@
 bbd179dfa0a71671c253b3ae0aa1513b60d199fa bar
+78391a272241d70354aa14c874552cad6b51bb42 bar
+0000000000000000000000000000000000000000 bar

tip                                5:5f6e8655b1c7
tip                                5:5f6e8655b1c7
% remove nonexistent tag
abort: tag 'foobar' does not exist
changeset:   5:5f6e8655b1c7
tag:         tip
user:        test
date:        Thu Jan 01 00:00:00 1970 +0000
summary:     Removed tag bar

% rollback undoes tag operation
rolling back to revision 4 (undo commit)
tip                                4:0c192d7d5e6b
bar                                1:78391a272241
tip                                4:0c192d7d5e6b
bar                                1:78391a272241
% test tag rank
tip                                5:85f05169d91d
bar                                0:bbd179dfa0a7
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
tip                                6:735c3ca72986
bar                                0:bbd179dfa0a7
% don't allow moving tag without -f
abort: tag 'bar' already exists (use -f to force)
tip                                6:735c3ca72986
bar                                0:bbd179dfa0a7
% strip 1: expose an old head
tip                                5:735c3ca72986
bar                                1:78391a272241
tip                                5:735c3ca72986
bar                                1:78391a272241
% strip 2: destroy whole branch, no old head exposed
tip                                4:735c3ca72986
bar                                0:bbd179dfa0a7
tip                                4:735c3ca72986
bar                                0:bbd179dfa0a7
% test tag rank with 3 heads
adding foo
tip                                3:197c21bbbf2c
bar                                2:6fa450212aeb
% bar should still point to rev 2
tip                                4:3b4b14ed0202
bar                                2:6fa450212aeb
% remove local as global and global as local
adding foo
abort: tag 'localtag' is not a global tag
abort: tag 'globaltag' is not a local tag
tip                                1:a0b6fe111088
localtag                           0:bbd179dfa0a7 local
globaltag                          0:bbd179dfa0a7