Re: [Xen-devel] [PATCH V2] libxl: support custom block hotplug scripts

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2012-08-01 at 10:57 +0100, Ian Campbell wrote:
> I have tested with a custom block script which uses "lvchange -a" to
> dynamically add remove the referenced device (simulates iSCSI login/logout
> without requiring me to faff around setting up an iSCSI target).

Script below for reference. Configured with:
 'access=w,vdev=xvde,script=block-lvm,target=VG=VG LV=trash'

Once you've done the initial "lvchange -a n /dev/VG/trash" then you
should find that /dv/VG/trash exists only when the domain exists.

I deliberately chose a target with = in it to valid the "target= eats to
end of line" use case. As expected it works, the params node ends up as
"VG=VG LV=trash". This also exercised the behaviour of not stat()ing the
device in libxl.

8<-------------------------------------------


#!/bin/bash

dir=$(dirname "$0")
. "$dir/block-common.sh"

p=$(xenstore_read "$XENBUS_PATH/params")
evalVariables $p

exec 1>>/tmp/block-lvm.log
DEV=/dev/$VG/$LV

echo block-lvm $command on `date`
echo VG=$VG LV=$LV DEV=$DEV

case "$command" in
  add)
    if [ -e $DEV ] ; then
        fatal "$DEV already active, disable with \`lvchange -a n $DEV\'"
    fi
    lvchange -a y $DEV
    write_dev $DEV
    exit 0
    ;;
  remove)
    lvchange -a n $DEV
    exit 0
    ;;
esac



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