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George Dunlap
5806acf503
Testing the hotplug external script path at the moment involves actually setting up one of the alternate datapaths (blktap, iscsi, &c). Simplify testing by making a script which does a simple loopback, but still has a target that can't be used directly. To use: script=block-dummy,vdev=xvda,target=dummy:<file> Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Tested-by: George Dunlap <george.dunlap@citrix.com>
108 lines
2.4 KiB
Bash
108 lines
2.4 KiB
Bash
#!/bin/bash -e
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#
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# dummy Xen block device hotplug script
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#
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# Author George Dunlap <george.dunlap@eu.citrix.com>
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#
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# Based on block-iscsi by Roger Pau Monné <roger.pau@citrix.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation; version 2.1 only. with the special
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# exception on linking described in file LICENSE.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# Usage:
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#
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# Target should be specified using the following syntax:
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#
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# script=block-dummy,vdev=xvda,target=dummy:<file>
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dir=$(dirname "$0")
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. "$dir/block-common.sh"
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check_tools()
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{
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if ! command -v losetup > /dev/null 2>&1; then
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fatal "Unable to find losetup"
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fi
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}
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# Sets the following global variables based on the params field passed in as
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# a parameter: type file
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parse_target()
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{
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params=($(echo "$1" | tr ":" "\n"))
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type=${params[0]}
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file=${params[1]}
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if [ -z "$type" ] || [ -z "$file" ]; then
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fatal "Cannot parse required parameters"
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fi
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if [ "$type" != "dummy" ] ; then
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fatal "Invalid type: $type"
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fi
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}
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# Attaches the device and writes xenstore backend entries to connect
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# the device
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add()
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{
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test -f "$file" || fatal "$file does not exist."
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loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev)
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if [ "$loopdev" = '' ]
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then
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fatal 'Failed to find an unused loop device'
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fi
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if LANG=C losetup -h 2>&1 | grep read-only >/dev/null
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then
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roflag="-$mode"; roflag="${roflag#-w}"; roflag="${roflag#-!}"
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else
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roflag=''
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fi
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do_or_die losetup $roflag "$loopdev" "$file"
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# FIXME Is this OK?
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xenstore_write "$XENBUS_PATH/node" "$loopdev"
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write_dev "$loopdev"
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}
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# Disconnects the device
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remove()
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{
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node=$(xenstore_read "$XENBUS_PATH/node")
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losetup -d "$node"
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}
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command=$1
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target=$(xenstore-read $XENBUS_PATH/params || true)
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if [ -z "$target" ]; then
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fatal "No information about the target"
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fi
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parse_target "$target"
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mode=$(xenstore_read "$XENBUS_PATH/mode")
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mode=$(canonicalise_mode "$mode")
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check_tools || exit 1
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case $command in
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add)
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add
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;;
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remove)
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remove
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;;
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*)
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exit 1
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;;
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esac
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