Remove stranded block-snapshot script

The real block-snapshot script is in qubes-core-admin.

misc/block-snapshot

@@ -1,276 +0,0 @@
-#!/bin/bash
-
-# Usage: block-snapshot add|remove img-file cow-file
-#
-# This creates dm-snapshot device on given arguments
-
-dir=$(dirname "$0")
-if [ "$1" = "prepare" ] || [ "$1" = "cleanup" ]; then
-  # shellcheck disable=SC1090,SC1091
-  . "$dir/xen-hotplug-common.sh"
-  command=$1
-else
-  # shellcheck disable=SC1090,SC1091
-  . "$dir/block-common.sh"
-fi
-
-shopt -s nullglob
-
-if [ -n "$XENBUS_PATH" ]; then
-  HOTPLUG_STORE="/var/run/xen-hotplug/${XENBUS_PATH//\//-}"
-fi
-
-get_dev() {
-  dev=$1
-
-  if [ -L "$dev" ]; then
-    dev=$(readlink -f "$dev") || fatal "$dev link does not exist."
-  fi
-
-  if [ -f "$dev" ]; then
-    file=$dev
-
-    loopdev=$(losetup -j "$file" | head -1 | cut -d : -f 1)
-    if [ -n "$loopdev" ]; then
-      # found existing loop to this file
-      echo "$loopdev"
-      return
-    fi
-
-    # assign new loop device
-    loopdev=$(losetup -f 2>/dev/null || find_free_loopback_dev)
-    if [ "$loopdev" = '' ]
-    then
-      release_lock "block"
-      fatal 'Failed to find an unused loop device'
-    fi
-
-    do_or_die losetup "$loopdev" "$file"
-    echo "$loopdev"
-  else
-    test -e "$dev" || fatal "$dev does not exist."
-    test -b "$dev" || fatal "$dev is not a block device nor file."
-  fi
-}
-
-get_dm_snapshot_name() {
-  base=$1
-  cow=$2
-
-  echo "snapshot-$(stat -c '%D:%i' "$base")-$(stat -c '%D:%i' "$cow")"
-}
-
-create_dm_snapshot() {
-  local base_dev cow_dev base_sz
-
-  dm_devname=$1
-  base=$2
-  cow=$3
-
-  if [ ! -e "/dev/mapper/$dm_devname" ]; then
-    # prepare new snapshot device
-    base_dev=$(get_dev "$base")
-    cow_dev=$(get_dev "$cow")
-    base_sz=$(blockdev --getsz "$base_dev")
-    do_or_die dmsetup create "$dm_devname" --table "0 $base_sz snapshot $base_dev $cow_dev P 256"
-  fi
-
-}
-
-create_dm_snapshot_origin() {
-  local base_dev base_sz
-
-  dm_devname=$1
-  base=$2
-
-  if [ ! -e "/dev/mapper/$dm_devname" ]; then
-    # prepare new snapshot-origin device
-    base_dev=$(get_dev "$base")
-    base_sz=$(blockdev --getsz "$base_dev")
-    do_or_die dmsetup create "$dm_devname" --table "0 $base_sz snapshot-origin $base_dev"
-  fi
-}
-
-t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
-
-case "$command" in
-  add)
-    case $t in
-      snapshot|origin)
-        p=$(xenstore_read_default "$XENBUS_PATH/params" 'MISSING')
-        if [ "$p" == "MISSING" ]; then
-          fatal "Missing device parameters ($t $XENBUS_PATH/params)"
-        fi
-        base=${p/:*/}
-        cow=${p/*:/}
-
-        if [ -L "$base" ]; then
-          base=$(readlink -f "$base") || fatal "$base link does not exist."
-        fi
-
-        if [ -L "$cow" ]; then
-          cow=$(readlink -f "$cow") || fatal "$cow link does not exist."
-        fi
-
-        # first ensure that snapshot device exists (to write somewhere changes from snapshot-origin)
-        dm_devname=$(get_dm_snapshot_name "$base" "$cow")
-
-        claim_lock "block"
-
-        # prepare snapshot device
-        create_dm_snapshot "$dm_devname" "$base" "$cow"
-
-        if [ "$t" == "snapshot" ]; then
-          #that's all for snapshot, store name of prepared device
-          xenstore_write "$XENBUS_PATH/node" "/dev/mapper/$dm_devname"
-          echo "/dev/mapper/$dm_devname" > "$HOTPLUG_STORE-node"
-          write_dev "/dev/mapper/$dm_devname"
-        elif [ "$t" == "origin" ]; then
-          # for origin - prepare snapshot-origin device and store its name
-          dm_devname=origin-$(stat -c '%D:%i' "$base")
-          create_dm_snapshot_origin "$dm_devname" "$base"
-          xenstore_write "$XENBUS_PATH/node" "/dev/mapper/$dm_devname"
-          echo "/dev/mapper/$dm_devname" > "$HOTPLUG_STORE-node"
-          write_dev "/dev/mapper/$dm_devname"
-        fi
-        # Save domain name for template commit on device remove
-        domain=$(xenstore_read_default "$XENBUS_PATH/domain" '')
-        if [ -z "$domain" ]; then
-          domid=$(xenstore_read "$XENBUS_PATH/frontend-id")
-          domain=$(xl domname "$domid")
-        fi
-        echo "$domain" > "$HOTPLUG_STORE-domain"
-
-        release_lock "block"
-        exit 0
-        ;;
-    esac
-    ;;
-  prepare)
-    t=$2
-    case $t in
-      snapshot|origin)
-        p=$3
-        base=${p/:*/}
-        cow=${p/*:/}
-
-        if [ -L "$base" ]; then
-          base=$(readlink -f "$base") || fatal "$base link does not exist."
-        fi
-
-        if [ -L "$cow" ]; then
-          cow=$(readlink -f "$cow") || fatal "$cow link does not exist."
-        fi
-
-        # first ensure that snapshot device exists (to write somewhere changes from snapshot-origin)
-        dm_devname=$(get_dm_snapshot_name "$base" "$cow")
-
-        claim_lock "block"
-
-        # prepare snapshot device
-        create_dm_snapshot "$dm_devname" "$base" "$cow"
-
-        if [ "$t" == "snapshot" ]; then
-          #that's all for snapshot, store name of prepared device
-          echo "/dev/mapper/$dm_devname"
-        elif [ "$t" == "origin" ]; then
-          # for origin - prepare snapshot-origin device and store its name
-          dm_devname=origin-$(stat -c '%D:%i' "$base")
-          create_dm_snapshot_origin "$dm_devname" "$base"
-          echo "/dev/mapper/$dm_devname"
-        fi
-
-        release_lock "block"
-        exit 0
-        ;;
-    esac
-    ;;
-  remove|cleanup)
-    if [ "$command" = "cleanup" ]; then
-      t=$2
-    else
-      t=$(cat "$HOTPLUG_STORE-type" 2>/dev/null || echo 'MISSING')
-    fi
-    case "$t" in
-      snapshot|origin)
-        if [ "$command" = "cleanup" ]; then
-          node=$3
-        else
-          node=$(cat "$HOTPLUG_STORE-node" 2> /dev/null)
-        fi
-
-        if [ -z "$node" ]; then
-          #fatal "No device node to remove"
-          #Most likely already removed
-          exit 0
-        fi
-
-        if [ ! -e "$node" ]; then
-          fatal "Device $node does not exists"
-        fi
-
-        claim_lock "block"
-
-        use_count=$(dmsetup info "$node"|grep Open|awk '{print $3}')
-
-        # do not remove snapshot if snapshot origin is still present
-        if [ "${node/snapshot/}" != "$node" ] && [ -e "/dev/mapper/origin-$(echo "$node"|cut -d- -f2)" ]; then
-          use_count=1
-        fi
-
-        if [ "$use_count" -gt 0 ]; then
-          log info "Device $node still in use - not removing"
-          release_lock "block"
-          exit 0
-        fi
-
-        # get list of used (loop) devices
-        deps="$(dmsetup deps "$node" | cut -d: -f2 | sed -e 's#(7, \([0-9]\+\))#/dev/loop\1#g')"
-
-        # if this is origin
-        if [ "${node/origin/}" != "$node" ]; then
-          # remove unused snapshots
-          for snap in /dev/mapper/snapshot-$(echo "$node"|cut -d- -f2)-*; do
-            use_count=$(dmsetup info "$snap"|grep Open|awk '{print $3}')
-            if [ "$use_count" -eq 0 ]; then
-              # unused snapshot - remove it
-              deps="$deps $(dmsetup deps "$snap" | cut -d: -f2 | sed -e 's#(7, \([0-9]\+\))#/dev/loop\1#g')"
-              log debug "Removing $snap"
-              dmsetup remove "$snap"
-            fi
-          done
-          if [ "$command" = "remove" ]; then
-            # Commit template changes
-            domain=$(cat "$HOTPLUG_STORE-domain")
-            if [ "$domain" ]; then
-              # Dont stop on errors
-              /usr/bin/qvm-template-commit "$domain" || true
-            fi
-          fi
-        fi
-
-        if [ -e "$node" ]; then
-          log debug "Removing $node"
-          dmsetup remove "$node"
-        fi
-
-        # try to free loop devices
-        for dev in $deps; do
-          if [ -b "$dev" ]; then
-            log debug "Removing $dev"
-            losetup -d "$dev" 2> /dev/null || true
-          fi
-        done
-
-        if [ -n "$HOTPLUG_STORE" ]; then
-          rm "$HOTPLUG_STORE-"*
-        fi
-        release_lock "block"
-
-        exit 0
-        ;;
-    esac
-    ;;
-esac
-
-# vim:sw=2:et: