-find_cow_device() {
- pers_label="${1}"
- cow_backing="/${pers_label}-backing"
- for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do
- for dev in $(subdevices "${sysblock}"); do
- devname=$(sys2dev "${dev}")
- if [ "$(/lib/udev/vol_id -l $devname 2>/dev/null)" = "${pers_label}" ]; then
- echo "$devname"
- return
- elif [ "$(get_fstype ${devname})" = "vfat" ]; then # FIXME: all supported block devices should be scanned
- mkdir -p "${cow_backing}"
- try_mount "${devname}" "${cow_backing}" "rw"
- if [ -e "${cow_backing}/${pers_label}" ]; then
- echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*")
- return 0
- else
- umount ${cow_backing}
- fi
- fi
- done
- done
+find_cow_device ()
+{
+ pers_label="${1}"
+ cow_backing="/${pers_label}-backing"
+
+ for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
+ do
+ for dev in $(subdevices "${sysblock}")
+ do
+ devname=$(sys2dev "${dev}")
+
+ if [ "$(/lib/udev/vol_id -l ${devname} 2>/dev/null)" = "${pers_label}" ]
+ then
+ echo "${devname}"
+ return
+ fi
+
+ case "$(get_fstype ${devname})" in
+ vfat|ext2|ext3|jffs2)
+ mkdir -p "${cow_backing}"
+ try_mount "${devname}" "${cow_backing}" "rw"
+
+ if [ -f "${cow_backing}/${pers_label}" ]
+ then
+ echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*")
+ return 0
+ else
+ umount ${cow_backing}
+ fi
+ ;;
+ *)
+ ;;
+ esac
+ done
+ done
+}
+
+find_files ()
+{
+ # return the first of ${filenames} found on vfat and ext2/ext3 devices
+ # FIXME: merge with above function
+
+ filenames="${1}"
+ snap_backing="/snap-backing"
+
+ for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
+ do
+ for dev in $(subdevices "${sysblock}")
+ do
+ devname=$(sys2dev "${dev}")
+ devfstype="$(get_fstype ${devname})"
+
+ if is_supported_fs ${devfstype}
+ then
+ mkdir -p "${snap_backing}"
+ try_mount "${devname}" "${snap_backing}" "ro"
+
+ for filename in ${filenames}
+ do
+ if [ -f "${snap_backing}/${filename}" ]
+ then
+ echo "${devname} ${snap_backing} ${filename}"
+ return 0
+ fi
+ done
+
+ umount ${snap_backing}
+ fi
+ done
+ done