On 03/12/2007 David Härdeman wrote:
>> losetup -a | grep -m1 "($src)$" | sed -e 's/:.*//g'
>>
>> which is a rather unclean solution. David, do you have any better
>> solution? i guess you do ;-)
>
> I haven't looked in depth at this code (yet), but perhaps "dmsetup deps
> $dst" could be used?
>
> Example output:
>
> # dmsetup deps cweird
> 1 dependencies : (7, 0)
>
> 7 is the major number for loop devices...so if we have (7, X) it's a
> loopback device...the check needs to be done before "do_close" though and
> the actual "losetup -d" needs to be done after "do_close".
yes, better solution than my previous one. i tried to implement it:
src_major=$(dmsetup deps "$dst" 2> /dev/null | sed -e 's/^.*(\([0-9]*\),
[0-9]*)$/\1/g' || true)
src_minor=$(dmsetup deps "$dst" 2> /dev/null | sed -e 's/^.*([0-9]*,
\([0-9]*\))$/\1/g' || true)
[...]
if [ "$src_major" = "7" ]; then
loopdev="/dev/loop${src_minor}"
if ! rm_lo_setup; then
device_msg "$dst" "detaching loopback failed"
continue
fi
fi
I also changed the checks for $major and $minor to $src_major and
$src_minor. $major and $minor are rather useless with the current
implementation.
greetings,
jonas
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