[Samba] vfs_shadow_copy2 doesn't seem to work with basedir of /
Matthew Cengia
mattcen at gmail.com
Fri Sep 16 21:05:56 MDT 2011
Hi all,
I'm using the VFS sbadow_copy2 module, and I think I've hit a bug. This
config works:
mattcen at adam:SambaTest$ cat works3/smb.conf
[SambaTest]
comment = SambaTest
writable = yes
path = /srv/SambaTest/share
#vfs objects = shadow_copy
vfs objects = shadow_copy2
shadow:snapdir = /mnt/dates
shadow:basedir = /srv
mattcen at adam:SambaTest$ ls /srv
SambaTest aquota.group aquota.user archive bittorrent cvs lost+found lxc nfs share tftp time_machine tmp
mattcen at adam:SambaTest$ ls /mnt/dates/@GMT-*
/mnt/dates/@GMT-2011.09.16-22.44.13:
SambaTest
/mnt/dates/@GMT-2011.09.16-22.44.36:
SambaTest
/mnt/dates/@GMT-2011.09.16-22.45.24:
SambaTest
/mnt/dates/@GMT-2011.09.16-23.03.18:
SambaTest
/mnt/dates/@GMT-2011.09.16-23.03.37:
SambaTest
/mnt/dates/@GMT-2011.09.16-23.03.56:
SambaTest
mattcen at adam:SambaTest$
This config doesn't:
mattcen at adam:SambaTest$ cat broken1/smb.conf
[SambaTest]
comment = SambaTest
writable = yes
path = /srv/SambaTest/share
#vfs objects = shadow_copy
vfs objects = shadow_copy2
shadow:snapdir = /mnt/dates
shadow:basedir = /
mattcen at adam:SambaTest$ ls /
bin boot cgroup dev etc home initrd.img lib lost+found media mnt opt proc root sbin selinux snapshots srv sys tmp usr var vmlinuz
mattcen at adam:SambaTest$ ls /mnt/dates/@GMT-*
/mnt/dates/@GMT-2011.09.16-22.44.13:
srv
/mnt/dates/@GMT-2011.09.16-22.44.36:
srv
/mnt/dates/@GMT-2011.09.16-22.45.24:
srv
/mnt/dates/@GMT-2011.09.16-23.03.18:
srv
/mnt/dates/@GMT-2011.09.16-23.03.37:
srv
/mnt/dates/@GMT-2011.09.16-23.03.56:
srv
mattcen at adam:SambaTest$
The latter config gives me the following in /var/log/samba/log.<client>:
[2011/09/17 00:06:42.354400, 0] modules/vfs_shadow_copy2.c:380(convert_shadow2_name)
convert_shadow2_name: basedir / is not a parent of /srv/SambaTest/share
I'm hitting this code in vfs_shadow_copy2.c, but I don't really
understand what it's doing:
mattcen at adam:samba$ nl -ba samba-3.5.6~dfsg/source3/modules/vfs_shadow_copy2.c | sed -n 376,383p
376 /* some sanity checks */
377 if (strncmp(basedir, handle->conn->connectpath, baselen) != 0 ||
378 (handle->conn->connectpath[baselen] != 0 && handle->conn->connectpath[baselen] != '/')) {
379 DEBUG(0,("convert_shadow2_name: basedir %s is not a parent of %s\n",
380 basedir, handle->conn->connectpath));
381 talloc_free(tmp_ctx);
382 return NULL;
383 }
I'm running Samba on Debian Squeeze:
mattcen at adam:tmp$ lsb_release -idrc
Distributor ID: Debian
Description: Debian GNU/Linux 6.0.2 (squeeze)
Release: 6.0.2
Codename: squeeze
mattcen at adam:tmp$ dpkg -l samba | tail -1
ii samba 2:3.5.6~dfsg-3squeeze5 SMB/CIFS file, print, and login server for Unix
Checking the Samba Git repo, it looks like the version I'm running is
from around commit 5529289e1d17d0524dc38aea11e0a3469818753c (at least
that has the same version of the vfs_shadow_copy2.c file), and I can see
that the git trunk has a complete rewrite of this module, but I don't
want to have to recompile my Samba deb after cherry-picking that module.
Can anybody see anything wrong with the way I've configured my smb.conf,
or does this actually look like a bug (which probably isn't worth
reporting since this code seems to be almost obsolete)?
--
Regards,
Matthew Cengia
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