chmod(2) / DOS Archive semantics
B.V.Dean at ukc.ac.uk
Fri Aug 25 09:05:07 GMT 2000
I have run up against a problem with "DOS Archive Bit" semantics in SAMBA 2.0.7.
We have directories that groups write to. If you have a group bedrock, with
users fred and barney you may have files thus:
-rwxrw-r-- 1 fred bedrock 1383 Aug 23 15:15 fred.html
-rwxrw-r-- 1 barney bedrock 1437 Aug 23 14:18 barney.html
If fred tries to change DOS archive (owner x on Unix) on fred.html,
BUT if fred tries to change DOS archive on barney.html it fails, of
course - from the manpage chmod(2):
> The effective user ID of the process must match the owner of
> the file or the process must have the appropriate privilege
> to change the mode of a file.
Samba is running as fred at this point, so it fails.
Looking at the source of SAMBA, it looks like a config command, much
like "dos filetimes" (that gets round a similar problem with utime(2)),
could be added and the source changed to say:
if ( dos_archive_semantics )
return to user ID
I don't feel confident enough to make this change at the moment as I do
not know my way round the source code.
Is anyone working on this?
This causes me a problem as I have nearly 400 web authors publishing
pages to my samba shares. They have been told to use Dreamweaver, which
tries to do this when publishing a file:
1 set DOS archive on
2 truncate file to 0 bytes
3 write new file contents
4 set time on destination file to same as source file
5 set DOS archive off
Steps 1, 4 and 5 fail if you do not own the file, but do have write
access. Although "dos filetimes" fixes step 4.
I need a fix for steps 1 and 5!
Senior Computing Officer
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