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mount sco eafs filesystem with linux

© December 2004 (various authors)
This is an interesting and clever solution:
From: johne@seasip.demon.co.uk
Subject: Re: Booting SCO 3.2v4.0 hard disk image in VMware or Bochs
Date: 7 Feb 2006 02:12:44 -0800
Message-ID: <1139307164.033189.36240@g44g2000cwa.googlegroups.com> 
References: <Pine.CYG.4.64.0601310954250.1204@nighthawk> 

Robert Giles wrote:
> Ahhhhh...  ok, well I'll go Google around for divvy, I had no idea there
> were multiple filesystems within one partition!

  Oddly enough, I was doing something very similar (extracting data
from a 3.2v4.2 system using Linux) last week. It took a lot of false
starts, but the eventual technique I used was:

- Run 'divvy' on the SCO machine, and note the output.
- Image its hard drive, and then restore the image into a virtual HD in
Virtual PC.
- Boot Linux in Virtual PC.
- Scan the imaged drive for a sector with the correct EAFS magic number
(0xfd187e21 at offset xyzxx3F8), and note how many sectors it is from
the start of the partition. That gives the offset to the first
filesystem, and the rest can be calculated from the divvy output.
- Use 'dd' with appropriate options to pull out the filesystems - eg:

dd if=/dev/hdd4 of=root.fs bs=1024 skip=8001 count=<count from divvy
dd if=/dev/hdd4 of=u.fs bs=1024 skip=<8001+divvy offset> count=<divvy

- Mount the resulting file using "-o loop,ro".

  On the Linux side, I was using an ancient 2.0.30 install manually
patched with the sco_fs patches (which were designed for 2.1.30, so
applying them wasn't straightforward). My understanding is that the
mainline Linux kernel only supports AFS (magic 0xfd187e20), not EAFS.
The sco_fs patches are also supposed to add divvy support to the Linux
kernel, but in my case they didn't get the subpartitions right so I
ended up using 'dd' as described above.
  One other thing - make sure the clock on the SCO system is set to
later than 1980. The machine I was imaging thought it was 1976 (no Y2K
patches had been applied) and Linux won't mount an EAFS system if its
check date is before 1980.

John Elliott

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-> mount sco eafs filesystem with linux

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