view tests/test-debugbuilddag.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%.

---- overwritten and appended files
-- dag
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
-- glog
@  11: r11 [] @ 11.00
|
o  10: r10 [] @ 10.00
|
o    9: r9 [] @ 9.00
|\
| o  8: r8 [temp] @ 8.00
| |
| o  7: r7 [temp] @ 7.00
| |
| o  6: r6 [temp] @ 6.00
| |
| o  5: r5 [temp] @ 5.00
| |
o |  4: r4 [] @ 4.00
| |
o |  3: r3 [] @ 3.00
| |
o |  2: r2 [] @ 2.00
|/
o  1: r1 [] @ 1.00
|
o  0: r0 [] @ 0.00

-- glog of
@  11: r11 []
|
o  10: r10 []
|
o    9: r9 []
|\
| o  8: r8 [temp]
| |
| o  7: r7 [temp]
| |
| o  6: r6 [temp]
| |
| o  5: r5 [temp]
| |
o |  4: r4 []
| |
o |  3: r3 []
| |
o |  2: r2 []
|/
o  1: r1 []
|
o  0: r0 []

-- glog af
@  11: r11 []
|
o  10: r10 []
|
o    9: r9 []
|\
| o  8: r8 [temp]
| |
| o  7: r7 [temp]
| |
| o  6: r6 [temp]
| |
| o  5: r5 [temp]
| |
o |  4: r4 []
| |
o |  3: r3 []
| |
o |  2: r2 []
|/
o  1: r1 []
|
o  0: r0 []

-- tags
tip                               11:f96e381c614c
p2                                 4:d9d6db981b55 local
f                                  1:73253def624e local
-- cat of
r11
-- cat af
r0
r1
r5
r6
r7
r8
r9
r10
r11
---- new and mergeable files
-- dag
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
-- glog
@  11: r11 [] @ 11.00
|
o  10: r10 [] @ 10.00
|
o    9: r9 [] @ 9.00
|\
| o  8: r8 [temp] @ 8.00
| |
| o  7: r7 [temp] @ 7.00
| |
| o  6: r6 [temp] @ 6.00
| |
| o  5: r5 [temp] @ 5.00
| |
o |  4: r4 [] @ 4.00
| |
o |  3: r3 [] @ 3.00
| |
o |  2: r2 [] @ 2.00
|/
o  1: r1 [] @ 1.00
|
o  0: r0 [] @ 0.00

-- glog mf
@  11: r11 []
|
o  10: r10 []
|
o    9: r9 []
|\
| o  8: r8 [temp]
| |
| o  7: r7 [temp]
| |
| o  6: r6 [temp]
| |
| o  5: r5 [temp]
| |
o |  4: r4 []
| |
o |  3: r3 []
| |
o |  2: r2 []
|/
o  1: r1 []
|
o  0: r0 []

-- man r4
mf
nf0
nf1
nf2
nf3
nf4
-- cat r4 mf
0 r0
1
2 r1
3
4 r2
5
6 r3
7
8 r4
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
-- man r8
mf
nf0
nf1
nf5
nf6
nf7
nf8
-- cat r8 mf
0 r0
1
2 r1
3
4
5
6
7
8
9
10 r5
11
12 r6
13
14 r7
15
16 r8
17
18
19
20
21
22
23
-- man
mf
nf0
nf1
nf10
nf11
nf2
nf3
nf4
nf5
nf6
nf7
nf8
nf9
-- cat mf
0 r0
1
2 r1
3
4 r2
5
6 r3
7
8 r4
9
10 r5
11
12 r6
13
14 r7
15
16 r8
17
18 r9
19
20 r10
21
22 r11
23
---- command
-- dag
+4:tip
-- glog
@  3: r3 []
|
o  2: r2 []
|
o  1: r1 []
|
o  0: r0 []

-- glog X
o  2: r2 []