Re: [9fans] Corrupted file entry on QEMU - how to recover?

[Pietro Gagliardi <pietro10@mac.com>]

Right now, I'm trying to get function definitions off of the plan9  
file so I can rebuild my profile. This should be as easy as grep.

On Dec 29, 2007, at 11:33 AM, Pietro Gagliardi wrote:

> OK, I'm going to hold this off for the new year. Until then, I  
> managed to free up a lot of space (and am continuing to do so), so  
> this time I'll put up a new 4GB QEMU fossil+venti Plan 9 and save  
> the old disk until I can fix it.
>
> On Dec 27, 2007, at 11:23 AM, Russ Cox wrote:
>
>>> Can someone PLEASE give me some information so I can get my files
>>> back? Otherwise, there goes my 3D library, my hoc implementation,  
>>> etc.
>>
>> I'm afraid you're probably out of luck, without a lot of work.
>>
>> The disk data structures are all described in /sys/doc/fossil.ps.
>>
>> If you were using snapshots, then you might be able to
>> use the information in /sys/doc/fossil.ps to write a program
>> to find all the fossil snapshot roots, and then you
>> could rewrite the super block to point at an older,
>> hopefully not corrupt, root.
>>
>> However, it looks like in plain fossil mode (not fossil+venti),
>> the installer does not configure any snapshots, so you'd
>> have had to turn them on yourself.
>>
>> Without snapshots, you'd have to poke around on the
>> disk looking for a VtSource that looked like the root
>> directory and then fix up the root block to be valid and
>> point at it.
>>
>> If you're not used to poking at file system data structures,
>> this might well be more work than just recreating your
>> hoc and 3D code.
>>
>> Russ
>>
>