Hi Mark
I've never tried this but it may work!! I don't have any test images small
enough to try it out on at the moment.
You can perform on the fly decompression using gzip by appending -c (to
standard out) and -d (decompress) before a pipe (|).
This works for hashing as follows: # gzip -cd image.dd.gz | sha1sum
This writes the output of gzip to standard out (-c) and decompresses it (-d).
The decompressed output is then piped into the sha1sum command (so basically it
is redirecting standard out to the command via the pipe).
I can't see any reason that this would not work on a mount command such as:
#gzip -cd image.dd.gz | mount -t <fs-type> <options> /mnt/image
To get the volume (you can't mount at disk level, only volume unless you use an
enhanced loopback device) you may have to pre-calculate your partition offsets
before you compress then add it into the mount command using the "-o" switch.
Sleuthkit's "mmls" command should give you the partition offsets.
I'd be interested to know if it works?
Stu
________________________________
From: Mark Rogers <m...@quarella.co.uk>
To: Peterborough LUG - No commercial posts <peterboro@mailman.lug.org.uk>
Sent: Thursday, 17 May 2012, 13:55
Subject: [Peterboro] Mounting disk images
Now that I'm starting to play with ARM devices I'm ending up with various
images of SD cards to manage.
Suppose I have an SD card in a USB card reader, /dev/sdb, containing two
partitions (/dev/sdb1,/dev/sdb2).
I can image it with dd to a compressed image:
sudo dd if=/dev/sdb | gzip > myimage.dd.gz
What are my options for later mounting (say) the second partition from the
compressed image?
Ideally I'd like to do this without uncompressing (usually it's just a case of
wanting to see the contents of a single file off the image).
If I have to do my images in a different way that's fine, particularly if I can
convert the existing ones.
mark
-- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450
Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER
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