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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%.
author | Martin Geisler <mg@aragost.com> |
---|---|
date | Mon, 09 Aug 2010 15:31:56 +0200 |
parents | 0332f8b44e54 |
children |
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SVN-fs-dump-format-version: 2 UUID: afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2009-06-21T16:34:55.835945Z PROPS-END Revision-number: 1 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 init projA K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:34:55.909545Z PROPS-END Node-path: branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: tags Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 5 hello K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:34:56.150049Z PROPS-END Node-path: trunk/à Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/à/é Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: e29311f6f1bf1af907f9ef9f44b8328b Text-content-sha1: e983f374794de9c64e3d1c1de1d490c0756eeeff Content-length: 12 PROPS-END d Node-path: trunk/é Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 9ffbf43126e33be52cd2bf7e01d627f9 Text-content-sha1: 094e3afb2fe8dfe82f63731cdcd3b999f4856cff Content-length: 12 PROPS-END e Revision-number: 3 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 copy files K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:34:59.089402Z PROPS-END Node-path: trunk/è Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/é Text-copy-source-md5: 9ffbf43126e33be52cd2bf7e01d627f9 Text-copy-source-sha1: 094e3afb2fe8dfe82f63731cdcd3b999f4856cff Node-path: trunk/ù Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/à Node-path: trunk/à Node-action: delete Node-path: trunk/é Node-action: delete Revision-number: 4 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 remove files K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:35:00.165121Z PROPS-END Node-path: trunk/è Node-action: delete Node-path: trunk/ù Node-action: delete Revision-number: 5 Prop-content-length: 120 Content-length: 120 K 7 svn:log V 18 branch to branché K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:35:03.079138Z PROPS-END Node-path: branches/branché Node-kind: dir Node-action: add Node-copyfrom-rev: 4 Node-copyfrom-path: trunk Revision-number: 6 Prop-content-length: 121 Content-length: 121 K 7 svn:log V 19 branch to branchée K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:35:06.060801Z PROPS-END Node-path: branches/branchée Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: branches/branché Revision-number: 7 Prop-content-length: 110 Content-length: 110 K 7 svn:log V 9 tag trunk K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:35:09.061530Z PROPS-END Node-path: tags/branché Node-kind: dir Node-action: add Node-copyfrom-rev: 6 Node-copyfrom-path: trunk Revision-number: 8 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 tag branché K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-06-21T16:35:11.068562Z PROPS-END Node-path: tags/branchée Node-kind: dir Node-action: add Node-copyfrom-rev: 6 Node-copyfrom-path: branches/branchée