-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 ${cow_backing}
- fi
- fi
- done
- done
+find_cow_device ()
+{
+ # Returns a device containing a partition labeled "${pers_label}" or containing a file named the same way
+ # in the latter case the partition containing the file is left mounted
+ # if is not in black_listed_devices
+ pers_label="${1}"
+ cow_backing="/${pers_label}-backing"
+ black_listed_devices="${2}"
+
+ if [ -z "${PERSISTENT_PATH}" ]
+ then
+ pers_fpath=${cow_backing}/${pers_label}
+ else
+ pers_fpath=${cow_backing}/${PERSISTENT_PATH}/${pers_label}
+ fi
+
+ for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
+ do
+ fulldevname=$(sys2dev "${sysblock}")
+
+ if echo "${black_listed_devices}" | grep -q -w "${fulldevname}"
+ then
+ # skip this device entirely
+ break
+ fi
+
+ for dev in $(subdevices "${sysblock}")
+ do
+ devname=$(sys2dev "${dev}")
+
+ if echo "${black_listed_devices}" | grep -q -w "${devname}"
+ then
+ # skip this subdevice
+ break
+ fi
+
+ # Checking for a luks device
+ if [ "${PERSISTENT}" = "cryptsetup" ] && [ -e /sbin/cryptsetup ] && /sbin/cryptsetup isLuks ${devname}
+ then
+ while true
+ do
+ load_keymap
+
+ /lib/cryptsetup/askpass "Enter passphrase for ${pers_label} on ${devname}: " | /sbin/cryptsetup -T 1 luksOpen ${devname} $(basename ${devname}) --key-file=-
+ error=${?}
+
+ devname="/dev/mapper/$(basename ${devname})"
+
+ if [ 0 -eq ${error} ]
+ then
+ unset error
+ break
+ fi
+
+ echo
+ echo -n "There was an error decrypting ${devname} ... Retry? [Y/n] " >&6
+ read answer
+
+ if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
+ then
+ unset answer
+ break
+ fi
+ done
+ fi
+
+ if [ "$(/sbin/blkid -s LABEL -o value $devname 2>/dev/null)" = "${pers_label}" ]
+ then
+ echo "${devname}"
+ return 0
+ fi
+
+ if [ "${PERSISTENT}" = "nofiles" ]
+ then
+ # do not mount the device to find for image files
+ # just skip this
+ continue
+ fi
+
+ case "$(get_fstype ${devname})" in
+ vfat|ext2|ext3|ext4|jffs2)
+ mkdir -p "${cow_backing}"
+ if try_mount "${devname}" "${cow_backing}" "rw"
+ then
+ if [ -f "${pers_fpath}" ]
+ then
+ echo $(setup_loop "${pers_fpath}" "loop" "/sys/block/loop*")
+ return 0
+ else
+ umount ${cow_backing} > /dev/null 2>&1 || true
+ fi
+ fi
+ ;;
+ *)
+ ;;
+ esac
+ done
+ done
+ return 1
+}
+
+find_files ()
+{
+ # return the a string composed by device name, mountpoint an the first of ${filenames} found on a supported partition
+ # FIXME: merge with above function
+
+ filenames="${1}"
+ snap_backing="/snap-backing"
+ black_listed_devices="${2}"
+
+ for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
+ do
+ fulldevname=$(sys2dev "${sysblock}")
+
+ if echo "${black_listed_devices}" | grep -q -w "${fulldevname}"
+ then
+ # skip this device entirely
+ break
+ fi
+
+ for dev in $(subdevices "${sysblock}")
+ do
+ devname=$(sys2dev "${dev}")
+ devfstype="$(get_fstype ${devname})"
+
+ if echo "${black_listed_devices}" | grep -q -w "${devname}"
+ then
+ # skip this subdevice
+ break
+ fi
+
+ if is_supported_fs ${devfstype}
+ then
+ mkdir -p "${snap_backing}"
+
+ if try_mount "${devname}" "${snap_backing}" "ro" "${devfstype}"
+ then
+ for filename in ${filenames}
+ do
+ if [ -f "${snap_backing}/${filename}" ]
+ then
+ echo "${devname} ${snap_backing} ${filename}"
+ umount ${snap_backing}
+ return 0
+ fi
+ done
+ fi
+
+ umount ${snap_backing}
+ fi
+ done
+ done