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#! /bin/bash
dir=$(dirname "$0")
. "$dir/xen-hotplug-common.sh"
# Claim the lock protecting ${XEN_SCRIPT_DIR}/block. This stops a race whereby
# paths in the store would disappear underneath that script as it attempted to
# read from the store checking for device sharing.
# Any other scripts that do similar things will have to have their lock
# claimed too.
# This is pretty horrible, but there's not really a nicer way of solving this.
claim_lock "block"
# split backend/DEVCLASS/VMID/DEVID on slashes
path_array=( ${XENBUS_PATH//\// } )
# get /vm/UUID path
vm=$(xenstore_read_default "/local/domain/${path_array[2]}/vm" "")
# construct /vm/UUID/device/DEVCLASS/DEVID
if [ "$vm" != "" ]; then
vm_dev="$vm/device/${path_array[1]}/${path_array[3]}"
# if the vm path does not exist and the device class is 'vbd' then we may have
# a tap2 device
if [ $(xenstore-read "$vm_dev" 2>/dev/null) != "" ] \
&& [ "${path_array[1]}" = "vbd" ]; then
vm_dev="$vm/device/tap2/${path_array[3]}"
fi
else
vm_dev=
fi
# remove device frontend store entries
xenstore-rm -t \
$(xenstore-read "$XENBUS_PATH/frontend" 2>/dev/null) 2>/dev/null || true
# remove device backend store entries
xenstore-rm -t "$XENBUS_PATH" 2>/dev/null || true
xenstore-rm -t "error/$XENBUS_PATH" 2>/dev/null || true
# remove device path from /vm/UUID
[ "$vm_dev" != "" ] && xenstore-rm -t "$vm_dev" 2>/dev/null || true
release_lock "block"
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