Restore a single file from ufs dump on FreeBSD

Written by Claudio Kuenzler - 0 comments

Published on April 7th 2014 - Listed in BSD Unix

Needed to restore a local file (/etc/ssh/sshd_config) from a ufs dump.
To be safe, I chose to not overwrite the current file with the one restored from the dump, so I created a temporary folder where to restore the file to:

mkdir /var/tmp/restore
cd /var/tmp/restore

Then launch the restore where the format is the following:

restore -x -v -f /path/to/dump filetorestore

restore: The restore command
-x: Extract the given file from the dumpfile
-v: Be verbose
-f: the path to the ufs dump (/path/to/dump)
filetorestore: Within the dump, look for this file to restore

In a practical usage this looks like:

restore -x -v -f /mnt/remotebkp/20140401_0313-level-0/_.dump-0 ./etc/ssh/sshd_config
Verify tape and initialize maps
Tape block size is 32
Dump   date: Tue Apr  1 03:13:22 2014
Dumped from: the epoch
Level 0 dump of / on mymachine.local:/dev/da0s1a
Label: none
Extract directories from tape
Initialize symbol table.
Make node ./etc
Make node ./etc/ssh
Extract requested files
You have not read any tapes yet.
If you are extracting just a few files, start with the last volume
and work towards the first; restore can quickly skip tapes that
have no further files to extract. Otherwise, begin with volume 1.
Specify next volume #: 1
extract file ./etc/ssh/sshd_config
Add links
Set directory mode, owner, and times.
set owner/mode for '.'? [yn] n

Important note: The file to be restore must start with a dot (see ./etc/ssh/sshd_config).
The reason for this is the file system structure within the dump, which can be verified in interactive mode:

restore -i -f /mnt/remotebkp/20140401_0313-level-0/_.dump-0
restore > cd etc
restore > ls
./etc:
[...]

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