Bug#757818: partman-lvm: Refuses to reinstall if it find old lvm volume

[Gabriele Giacone <1o5g4r8o@gmail.com>]

On Thu, Sep 04, 2014 at 02:18:43PM +0200, Petter Reinholdtsen wrote:
> I first tried with 
> 
>   log-output -t partman-lvm lvcreate --wipesignatures y -l "$extents" \
>     -n "$lv" $vg
> 
> but this did not work as I had hoped.  Next, I tried using --yes instead
> of '--wipesignatures y', and this worked as intended.

man lvcreate says
 -W, --wipesignatures {y|n}
   [...]
   This default behaviour can be controlled by
   allocation/wipe_signatures_when_zeroing_new_lvs
   setting found in lvm.conf(5).
   [...]

$ sudo lvm dumpconfig |grep wipe
    wipe_signatures_when_zeroing_new_lvs=1

Thus it's already enabled. And that means it checks their presence and
unfortunately asks for wiping.
IMHO it should not prompt at all. Or prompt only if unset.

Also see thread
https://lists.fedorahosted.org/pipermail/anaconda-patches/2014-January/thread.html#8514

Anyway, with -Wn (do not wipe them), it doesn't prompt anymore and
lvcreation succeeds:

 # lvcreate -l1 -n lv00 vg00 ; mkswap -f /dev/vg00/lv00 ; lvremove -f /dev/vg00/lv00
   Logical volume "lv00" created
 Setting up swapspace version 1, size = 4092 KiB
 no label, UUID=8b4f2693-6b36-4f1b-b64b-eebbb273152b
   Logical volume "lv00" successfully removed
 
 # lvcreate -l1 -n lv00 vg00
 WARNING: swap signature detected on /dev/vg00/lv00. Wipe it? [y/n]: y
   Wiping swap signature on /dev/vg00/lv00.
   Logical volume "lv00" created
 
 # mkswap -f /dev/vg00/lv00 ; lvremove -f /dev/vg00/lv00
 Setting up swapspace version 1, size = 4092 KiB
 no label, UUID=7131bd2b-6312-49e1-9aa0-7dafeba6b844
   Logical volume "lv00" successfully removed
 
 # lvcreate -Wn -l1 -n lv00 vg00
   Logical volume "lv00" created

Better than --yes? I didn't test it on d-i.

-- 
G..e