freebsd stable - Feb 2008 - UFS snapshot weirdness

Hi all,

I've been making a wrapper script for the backup tool 'duplicity',  
allowing me to create config files for each resource, wherein I define  
whether a snapshot should be made prior to backing up the resource or  
not.

Now I find that my snapshots never change ....

The script creates a snapshot, creates md device, mounts it, runs  
backup against the mounted snapshot, dismounts, removes md device, and  
rm -f's the snapshot file.

The problem is .. Whenever I look into the mounted snapshot, a given  
directory looks like so:

drwxr-xr-x   3 root  wheel   512 Jan 29 15:25 .
drwxr-xr-x  18 root  wheel   512 Jan 29 13:49 ..
-rw-------   1 root  wheel  1281 Jan 31 17:12 .bash_history
-rw-r--r--   2 root  wheel   786 Jan 29 13:00 .cshrc
-rw-r--r--   1 root  wheel   143 Jan 29 13:00 .k5login
-rw-r--r--   1 root  wheel   293 Jan 29 13:00 .login
-rw-r--r--   2 root  wheel   253 Jan 29 13:00 .profile
drwxr-xr-x   2 root  wheel   512 Jan 29 13:00 .ssh

However, when looking into the same directory outside the snapshot, it  
looks like so:

-rw-------   1 root  wheel       2961 Feb 12 00:39 .bash_history
-rw-r--r--   2 root  wheel        786 Jan 29 13:00 .cshrc
-rw-r--r--   1 root  wheel        143 Jan 29 13:00 .k5login
drwx------   2 root  wheel        512 Feb 11 16:23 .links
-rw-r--r--   1 root  wheel        293 Jan 29 13:00 .login
-rw-r--r--   2 root  wheel        253 Jan 29 13:00 .profile
drwxr-xr-x   2 root  wheel        512 Jan 29 13:00 .ssh
-rw-r--r--   1 root  wheel     948424 Feb 11 13:14 bsd-jdk16- 
patches-3.tar.bz2
-rw-r--r--   1 root  wheel   46938731 Feb 11 16:23 diablo-jdk- 
freebsd6.amd64.1.5.0.07.01.tbz
-rw-r--r--   1 root  wheel    2116124 Feb 11 13:11 jdk-6u3-fcs-bin-b05- 
jrl-24_sep_2007.jar
-rw-r--r--   1 root  wheel    8608204 Feb 11 13:11 jdk-6u3-fcs- 
mozilla_headers-b05-unix-24_sep_2007.jar
-rw-r--r--   1 root  wheel  116791442 Feb 11 13:15 jdk-6u3-fcs-src-b05- 
jrl-24_sep_2007.jar

The snapshot was made just now, long after those additional files were  
placed in the snapshot.

I am at a total loss here. Is it re-using the first snapshot I ever  
made of this filesystem, even though I've removed it? Didn't I  
understand how to create/remove snapshots? Is this a bug?

Any input is appreciated.

Thanks,
/Eirik

On Tue, 12 Feb 2008, Eirik ?verby wrote:
> I am at a total loss here. Is it re-using the first snapshot I ever
> made of this filesystem, even though I've removed it? Didn't I
> understand how to create/remove snapshots? Is this a bug?
Sure the old md isn't hanging around by mistake or some such?

I have had people recover many files using the snapshot tool in ports 
(plus a small symlink maker for samba access) and haven't noticed 
issues like this.

On the otherhand I find it can take a long time to make a snapshot 
(during which time no FS access is allowed).

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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