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%.
rm 'd/b'
assuming destination git-repo-hg
initializing destination git-repo-hg repository
scanning source...
sorting...
converting...
5 t1
4 t2
3 t3
2 t4.1
1 t4.2
0 Merge branch other
changeset: 5:c78094926be2
tag: tip
parent: 3:f5f5cb45432b
parent: 4:4e174f80c67c
user: test <test@example.org>
date: Mon Jan 01 00:00:15 2007 +0000
files: a
description:
Merge branch other
% full conversion
@ 9 "Discard change to foo" files: foo
|\
| o 8 "change foo" files: foo
| |
o | 7 "change bar" files: bar
|/
o 6 "(octopus merge fixup)" files:
|\
| o 5 "Octopus merge" files: baz
| |\
o | | 4 "add baz" files: baz
| | |
+---o 3 "add bar" files: bar
| |
o | 2 "add quux" files: quux
| |
| o 1 "change foo" files: foo
|/
o 0 "add foo" files: foo
245a3b8bc653999c2b22cdabd517ccb47aecafdf 644 bar
354ae8da6e890359ef49ade27b68bbc361f3ca88 644 baz
9277c9cc8dd4576fc01a17939b4351e5ada93466 644 foo
88dfeab657e8cf2cef3dec67b914f49791ae76b1 644 quux
% foo bar baz: octopus merge
@ 8 "Discard change to foo" files: foo
|\
| o 7 "change foo" files: foo
| |
o | 6 "change bar" files: bar
|/
o 5 "(octopus merge fixup)" files:
|\
| o 4 "Octopus merge" files: baz
| |\
o | | 3 "add baz" files: baz
| | |
+---o 2 "add bar" files: bar
| |
| o 1 "change foo" files: foo
|/
o 0 "add foo" files: foo
245a3b8bc653999c2b22cdabd517ccb47aecafdf 644 bar
354ae8da6e890359ef49ade27b68bbc361f3ca88 644 baz
9277c9cc8dd4576fc01a17939b4351e5ada93466 644 foo
% foo baz quux: only some parents of an octopus merge; "discard" a head
@ 6 "Discard change to foo" files: foo
|
o 5 "change foo" files: foo
|
o 4 "Octopus merge" files:
|\
| o 3 "add baz" files: baz
| |
| o 2 "add quux" files: quux
| |
o | 1 "change foo" files: foo
|/
o 0 "add foo" files: foo
354ae8da6e890359ef49ade27b68bbc361f3ca88 644 baz
9277c9cc8dd4576fc01a17939b4351e5ada93466 644 foo
88dfeab657e8cf2cef3dec67b914f49791ae76b1 644 quux
% test binary conversion (issue 1359)
% convert binary file
initializing destination git-repo3-hg repository
scanning source...
sorting...
converting...
0 addbinary
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
4096
% test author vs committer
% convert author committer
initializing destination git-repo4-hg repository
scanning source...
sorting...
converting...
1 addfoo
0 addfoo2
changeset: 1:d63e967f93da
tag: tip
user: nottest <test@example.org>
date: Mon Jan 01 00:00:21 2007 +0000
files: foo
description:
addfoo2
committer: test <test@example.org>
changeset: 0:0735477b0224
user: test <test@example.org>
date: Mon Jan 01 00:00:20 2007 +0000
files: foo
description:
addfoo
% --sourceorder should fail
initializing destination git-repo4-sourcesort-hg repository
abort: --sourcesort is not supported by this data source
% damage git repository and convert again
abort: