09-22-2011
That's a tape archive!
Specifically ustar, the modern kind. See
tar (file format)
Each file record begins with a header containing, among other things, a filename and 'ustar'. The literal contents of the file follow immediately after, padded to a certain block size.
This is good news. If you can figure out where the file begins and ends, you can dump it and extract it with ordinary tools, and build a new one from scratch. (It'd be best to do so on a UNIX system though, because it contains important file permissions, something a Windows system would botch mercilessly.)
You might also be able to append things without altering the previous content; tar, being originally built for tapes, plays well with that.
Last edited by Corona688; 09-22-2011 at 06:51 PM..
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LEARN ABOUT DEBIAN
amfetchdump
AMFETCHDUMP(8) System Administration Commands AMFETCHDUMP(8)
NAME
amfetchdump - extract backup images from multiple Amanda tapes.
SYNOPSIS
amfetchdump [-c|-C|-L] [-p|-n] [-a] [-O directory] [-d device] [-h] [--header-file filename] [--header-fd fd] [-o configoption...] config
hostname [disk [ date [ level [ hostname [...] ] ] ]]
DESCRIPTION
Amfetchdump pulls one or more matching dumps from tape or from the holding disk, handling the reassembly of multi-tape split dump files as
well as any tape autochanger operations.
It will automatically use the Amanda catalog to locate available dumps on tape, in the same way that the find feature of amadmin(8) lists
available dumps.
The hostname, diskname, datestamp, and level dump specifications are further described in amanda-match(7). Note that at minimum a hostname
must be specified.
Unless -p is used, backup images are extracted to files in the current directory named:
If a changer error occurs, or the -d option is given, then amfetchdump prompts for each required volume.
hostname.diskname.datestamp.dumplevel
OPTIONS
-p
Pipe exactly one complete dump file to stdout, instead of writing the file to disk. This will restore only the first matching dumpfile
(where "first" is determined by the dump log search facility).
-h
Output the amanda header as a 32K block to same output as the image.
--header-fd fd
Output the amanda header to the numbered file descriptor.
--header-file filename
Output the amanda header to the filename.
-d device_or_changer
Restore from this device or changer instead of the default, prompting for each volume.
-O directory
Output restored files to this directory, instead of to the current working directory.
-c
Compress output, fastest method available.
-C
Compress output, smallest file size method available.
-l
Leave dumps in the compressed/uncompressed state in which they were found on tape. By default, amfetchdump will automatically
uncompress when restoring.
-a
Assume that all tapes are already available, via tape changer or otherwise, instead of prompting the operator to ensure that all tapes
are loaded.
-n
Do not reassemble split dump files at all, just restore each piece as an individual file.
-o configoption
See the "CONFIGURATION OVERRIDE" section in amanda(8).
EXAMPLES
All the examples here assume your configuration is called SetA.
Here's a simple case, restoring all known dumps of the host vanya to the current working directory.
$ amfetchdump SetA vanya
A more likely scenario involves restoring a particular dump from a particular date. We'll pipe this one to GNU-tar as well, to
automatically extract the dump.
$ amfetchdump -p SetA vanya /home 20051020 | gtar -xvpf -
CAVEATS
Amfetchdump is dependent on accessing your server's config, tape changer, and (normally) dump logs. As such, it's not necessarily the most
useful tool when those have all been wiped out and you desperately need to pull things from your tape. Pains have been taken to make it as
capable as possible, but for seriously minimialist restores, look to amrestore(8) or dd(8) instead.
SEE ALSO
amanda(8), amanda-match(7), amadmin(8), amrestore(8)
The Amanda Wiki: : http://wiki.zmanda.com/
AUTHORS
John Stange <building@nap.edu>
National Academies Press
Ian Turner <ian@zmanda.com>
Zmanda, Inc. (http://www.zmanda.com)
Amanda 3.3.1 02/21/2012 AMFETCHDUMP(8)