From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <816a43e64340b5f06e1299d88e1b9943@plan9.escet.urjc.es>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] simple venti question.
From: Fco.J.Ballesteros <nemo@plan9.escet.urjc.es>
In-Reply-To: <Pine.LNX.4.44.0402032206250.23042-100000@maxroach.lanl.gov>
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Date: Wed,  4 Feb 2004 08:23:38 +0100
Topicbox-Message-UUID: ccfc3e96-eacc-11e9-9e20-41e7f4b1d025

> Do I take the lastest or the firstest vac that gets printed when I do the
> 8.printarenas ?

Regarding the vac for your fossil, perhaps you could use the
script from rsc that I include below to print the last fossil vac number, and then do
a fossil/flfmt -v using that vac to recover from venti.

> err 2: mistmatched number index sections: found 2 expected 1
> fatal venti error blah blah blah

I've never seen this. I think that it's just that your venti
index is wrong. But from the man page it seems that you'd better
try venti/checkindex and then venti/buildindex, should checkindex
fail.


          venti/checkindex [ -f ] [ -B blockcachesize ] venti.config
          tmp
         venti/buildindex [ -B blockcachesize ] [ -Z ] venti.config
          tmp
          Buildindex .... This command is typically
          used to build a new index for a Venti system when the old
          index becomes too small, or to rebuild an index after media
          failure.

            Checkindex examines the Venti index described in
          venti.config. The program detects various error conditions
          including: blocks that are not indexed, index entries for
          blocks that do not exist, and duplicate index entries.  If
          requested, an attempt can be made to fix errors that are
          found.



#!/bin/rc

rfork e

switch($#*){
case 0
	file=/dev/sdC0/fossil
case 1
	file=$1
case *
	echo 'usage: lastfossil [/dev/sdC0/fossil]' >[1=2]
	exit usage
}

fn h2d { echo 'ibase=16;' print `{echo $1|tr a-z A-Z} |bc }
header=`{dd -bs 1024 -iseek 128 -count 1 -if $file >[2]/dev/null| xd -b | sed 1q}
bsize=`{h2d $header(8)^$header(9)}
super=`{h2d 0$header(10)^$header(11)^$header(12)^$header(13)}
x=`{dd -bs $bsize -iseek $super -count 1 -if $file >[2]/dev/null | xd -b |
	sed '1,2d;3s/^.......  .. .. //;4s/^.......  (.. .. .. .. .. ..).*/\1/;4q' | tr -d ' '}
echo vac:^$x(1)^$x(2)