gahr at gahr.ch
Thu Feb 7 18:07:20 UTC 2008
here's the situation:
HostServer exports via NFS /www, which belongs to user:www
(uid=1001, gid=80). The directory has the segid flag set:
drwsr-xr-x 13 user www 512 Feb 7 00:58 www
HostClient mounts the exported directory on /share/www. HostClient
doesn't know anything about gid 80.
Now, on HostClient, user copies aFile to /share/www using the -p flag of
> cp -p aFile /share/www/
> ls -l
-rw------- 1 user user 2981888 Feb 7 01:09 /www/aFile
As shown, the setgid flag of /www hasn't worked.
Now in man cp, I can read the following:
"If the source file has its set-user-ID bit on and the user ID cannot be
preserved, the set-user-ID bit is not preserved in the copy's
permissions. If the source file has its set-group-ID bit on and the
group ID cannot be preserved, the set-group-ID bit is not preserved in
the copy's permissions. If the source file has both its set-user-ID and
set-group-ID bits on, and either the user ID or group ID cannot be
preserved, neither the set-user-ID nor set-group-ID bits are preserved
in the copy's permissions."
I cannot find anywhere information such as "If the /*destination*/ file
directory has its set-group-ID bit on and the group-ID cannot be
preserved, the set-group-ID bit is not preserved in the copy's permissions."
Assuming that this is the correct and expected behavior, why is it like
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