ref: 2fe3b28f86ed4aa291fb8a620b948abe9c6a1f84
dir: /sys/src/cmd/venti/words/backup.example/
#!/bin/rc
rfork e
cd /usr/rsc
. bkup.info
fn x {
echo x $*
y=$1
if(~ $#$y 0){
$y=0
}
echo venti/wrarena -o $2 $3 $$y
end=`{venti/wrarena -o $2 $3 $$y | grep '^end offset ' | sed 's/^end offset //'}
if(~ $#end 1 && ! ~ $$y $end){
$y=$end
echo '#' `{date} >>bkup.info
whatis $y >>bkup.info
}
}
hget http://127.1:8000/index |
awk '
/^index=/ { blockSize=0+substr($3, 11); }
/^arena=/ { arena=substr($1, 7); }
/^ arena=/ { start=0+substr($5, 2)-blockSize; printf("x %s %d %s\n", arena, start, $3); }
' |rc