/etc/xen/scripts/block-dummy is in xen-utils-common 4.9.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | #!/bin/bash -e
#
# dummy Xen block device hotplug script
#
# Author George Dunlap <george.dunlap@eu.citrix.com>
#
# Based on block-iscsi by Roger Pau Monné <roger.pau@citrix.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation; version 2.1 only. with the special
# exception on linking described in file LICENSE.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# Usage:
#
# Target should be specified using the following syntax:
#
# script=block-dummy,vdev=xvda,target=dummy:<file>
dir=$(dirname "$0")
. "$dir/block-common.sh"
check_tools()
{
if ! command -v losetup > /dev/null 2>&1; then
fatal "Unable to find losetup"
fi
}
# Sets the following global variables based on the params field passed in as
# a parameter: type file
parse_target()
{
params=($(echo "$1" | tr ":" "\n"))
type=${params[0]}
file=${params[1]}
if [ -z "$type" ] || [ -z "$file" ]; then
fatal "Cannot parse required parameters"
fi
if [ "$type" != "dummy" ] ; then
fatal "Invalid type: $type"
fi
}
# Attaches the device and writes xenstore backend entries to connect
# the device
add()
{
test -f "$file" || fatal "$file does not exist."
loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev)
if [ "$loopdev" = '' ]
then
fatal 'Failed to find an unused loop device'
fi
if LANG=C losetup -h 2>&1 | grep read-only >/dev/null
then
roflag="-$mode"; roflag="${roflag#-w}"; roflag="${roflag#-!}"
else
roflag=''
fi
do_or_die losetup $roflag "$loopdev" "$file"
# FIXME Is this OK?
xenstore_write "$XENBUS_PATH/node" "$loopdev"
write_dev "$loopdev"
}
# Disconnects the device
remove()
{
node=$(xenstore_read "$XENBUS_PATH/node")
losetup -d "$node"
}
command=$1
target=$(xenstore-read $XENBUS_PATH/params || true)
if [ -z "$target" ]; then
fatal "No information about the target"
fi
parse_target "$target"
mode=$(xenstore_read "$XENBUS_PATH/mode")
mode=$(canonicalise_mode "$mode")
check_tools || exit 1
case $command in
add)
add
;;
remove)
remove
;;
*)
exit 1
;;
esac
|