Mercurial > hg
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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 | a9b427b5821e |
| children | 5fb924ee44d5 |
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SVN-fs-dump-format-version: 2 UUID: 4a895937-439c-4e56-b7b0-fa1c8acc0c20 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-05-09T14:57:31.007802Z PROPS-END Revision-number: 1 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 7 initial K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-09T14:57:32.094732Z PROPS-END Node-path: branches 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 Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Node-path: trunk/d Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d/b Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Text-content-sha1: 89e6c98d92887913cadf06b2adb97f26cde4849b Content-length: 12 PROPS-END b Node-path: trunk/dlink Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: cca56829f18345718a4980bb02b6d8c3 Text-content-sha1: 7c54cc5d472b78c94a04382df34b0f4f0f4f2d49 Content-length: 39 K 11 svn:special V 1 * PROPS-END link d Node-path: trunk/dlink2 Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: cca56829f18345718a4980bb02b6d8c3 Text-content-sha1: 7c54cc5d472b78c94a04382df34b0f4f0f4f2d49 Content-length: 39 K 11 svn:special V 1 * PROPS-END link d Node-path: trunk/dlink3 Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: cca56829f18345718a4980bb02b6d8c3 Text-content-sha1: 7c54cc5d472b78c94a04382df34b0f4f0f4f2d49 Content-length: 39 K 11 svn:special V 1 * PROPS-END link d Revision-number: 2 Prop-content-length: 117 Content-length: 117 K 7 svn:log V 15 clobber symlink K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-09T14:57:33.071117Z PROPS-END Node-path: trunk/dlink3 Node-kind: file Node-action: change Prop-content-length: 10 Text-content-length: 2 Text-content-md5: e29311f6f1bf1af907f9ef9f44b8328b Text-content-sha1: e983f374794de9c64e3d1c1de1d490c0756eeeff Content-length: 12 PROPS-END d Revision-number: 3 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 8 clobber1 K 10 svn:author V 4 evil K 8 svn:date V 27 2010-05-09T14:57:35.268057Z PROPS-END Node-path: trunk/a Node-kind: dir Node-action: delete Node-path: trunk/a Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/d Node-path: trunk/dlink Node-kind: dir Node-action: delete Node-path: trunk/dlink Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/d Revision-number: 4 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 8 clobber2 K 10 svn:author V 4 evil K 8 svn:date V 27 2010-05-09T14:57:35.521816Z PROPS-END Node-path: trunk/dlink3 Node-kind: file Node-action: delete Node-path: trunk/dlink3 Node-kind: file Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: trunk/dlink2 Text-copy-source-md5: cca56829f18345718a4980bb02b6d8c3 Text-copy-source-sha1: 7c54cc5d472b78c94a04382df34b0f4f0f4f2d49