fi
}
-find_cow_device ()
+find_persistent_media ()
{
- # Returns a device containing a partition labeled "${pers_label}" or containing a file named the same way
- # in the latter case the partition containing the file is left mounted
- # if is not in black_listed_devices.
- # Additionally, if the white_listed_devices list is non-empty, the
- # parent block device of the returned device must be part of this list.
- pers_label="${1}"
- cow_backing="/${pers_label}-backing"
- black_listed_devices="${2}"
- white_listed_devices="${3}"
-
- if [ -z "${PERSISTENT_PATH}" ]
- then
- pers_fpath=${cow_backing}/${pers_label}
- else
- pers_fpath=${cow_backing}/${PERSISTENT_PATH}/${pers_label}
- fi
+ # Scans devices for overlays and snapshots, and returns a whitespace
+ # separated list of how to use them. Only overlays with a partition
+ # label or file name in ${overlays} are returned, and ditto for
+ # snapshots with labels in ${snapshots}.
+ #
+ # When scanning a LUKS device, the user will be asked to enter the
+ # passphrase; on failure to enter it, or if no persistent partitions
+ # or files were found, the LUKS device is closed.
+ #
+ # For a snapshot file the return value is ${label}=${snapdata}", where
+ # ${snapdata} is the parameter used for try_snap().
+ #
+ # For all other cases (overlay/snapshot partition and overlay file) the
+ # return value is "${label}=${device}", where ${device} a device that
+ # can mount the content. In the case of an overlay file, the device
+ # containing the file will remain mounted as a side-effect.
+ #
+ # No devices in ${black_listed_devices} will be scanned, and if
+ # ${white_list_devices} is non-empty, only devices in it will be
+ # scanned.
+
+ overlays="${1}"
+ snapshots="${2}"
+ black_listed_devices="${3}"
+ white_listed_devices="${4}"
for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
do
+ luks_device=""
+
# Checking for a luks device
if [ "${PERSISTENT_ENCRYPTION}" = "luks" ] && [ -e /sbin/cryptsetup ]
then
continue
fi
+ if [ ! -x /lib/cryptsetup/askpass ] || [ ! -x /sbin/cryptsetup ]
+ then
+ log_warning_msg "cryptsetup in unavailable"
+ continue
+ fi
+
if ! /sbin/cryptsetup isLuks ${dev}
then
- # we only look for encrypted subdevices
+ # skip device since we strictly want luks devices
continue
fi
+ load_keymap
+
while true
do
- load_keymap
+ /lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | /sbin/cryptsetup -T 1 luksOpen ${dev} $(basename ${dev}) --key-file=-
- /lib/cryptsetup/askpass "Enter passphrase for ${pers_label} on ${dev}: " | /sbin/cryptsetup -T 1 luksOpen ${dev} $(basename ${dev}) --key-file=-
- error=${?}
-
- dev="/dev/mapper/$(basename ${dev})"
-
- if [ 0 -eq ${error} ]
+ if [ 0 -eq ${?} ]
then
- unset error
+ luks_device="/dev/mapper/$(basename ${dev})"
+ dev="${luks_device}"
break
fi
if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
- unset answer
- # skip to next subdevice
- continue 2
+ break
fi
done
fi
- if echo ${PERSISTENT_STORAGE} | grep -qw filesystem && [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${pers_label}" ]
- then
- echo "${dev}"
- return 0
- fi
-
- if ! echo ${PERSISTENT_STORAGE} | grep -qw file
- then
- # do not mount the device to find for image files
- # just skip this
- continue
- fi
-
- devfstype="$(get_fstype ${dev})"
-
- if is_supported_fs ${devfstype}
+ if echo ${PERSISTENT_STORAGE} | grep -qw filesystem
then
- mkdir -p "${cow_backing}"
- if try_mount "${dev}" "${cow_backing}" "rw"
- then
- if [ -f "${pers_fpath}" ]
+ for label in ${overlays} ${snapshots}
+ do
+ if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
then
- echo $(setup_loop "${pers_fpath}" "loop" "/sys/block/loop*")
- return 0
- else
- umount ${cow_backing} > /dev/null 2>&1 || true
+ overlays=$(echo ${overlays} | sed -e "s|\<${label}\>||")
+ snapshots=$(echo ${snapshots} | sed -e "s|\<${label}\>||")
+ echo "${label}=${dev}"
+ # skip to the next device
+ continue 2
fi
- fi
+ done
fi
- done
- return 1
-}
-
-find_files ()
-{
- # return the a string composed by device name, mountpoint an the first of ${filenames} found on a supported partition
- # if is not in black_listed_devices.
- # Additionally, if the white_listed_devices list is non-empty, the
- # parent block device of the returned device must be part of this list.
- # FIXME: merge with above function
-
- filenames="${1}"
- snap_backing="/snap-backing"
- black_listed_devices="${2}"
- white_listed_devices="${3}"
- for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
- do
- devfstype="$(get_fstype ${dev})"
-
- if is_supported_fs ${devfstype}
+ if echo ${PERSISTENT_STORAGE} | grep -qw file
then
- mkdir -p "${snap_backing}"
-
- if try_mount "${dev}" "${snap_backing}" "ro" "${devfstype}"
+ devfstype="$(get_fstype ${dev})"
+ overlay_on_dev=""
+ snapshot_on_dev=""
+ backing="/$(basename ${dev})-backing"
+ mkdir -p "${backing}"
+ if is_supported_fs ${devfstype} && try_mount "${dev}" "${backing}" "rw" "${devfstype}"
then
- for filename in ${filenames}
+ for label in ${overlays}
do
- if [ -f "${snap_backing}/${filename}" ]
+ path=${backing}/${PERSISTENT_PATH}${label}
+ if [ -f "${path}" ]
then
- echo "${dev} ${snap_backing} ${filename}"
- umount ${snap_backing}
- return 0
+ overlays=$(echo ${overlays} | sed -e "s|\<${label}\>||")
+ overlay_on_dev="yes"
+ echo "${label}=$(setup_loop "${path}" "loop" "/sys/block/loop*")"
fi
done
+
+ for label in ${snapshots}
+ do
+ for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
+ do
+ path="${PERSISTENT_PATH}${label}.${ext}"
+ if [ -f "${backing}/${path}" ]
+ then
+ snapshots=$(echo ${snapshots} | sed -e "s|\<${label}\>||")
+ snapshot_on_dev="yes"
+ echo "${label}=${dev}:${backing}:${path}"
+ fi
+ done
+ done
+ fi
+ if [ -z "${overlay_on_dev}" ]
+ then
+ umount ${backing} > /dev/null 2>&1 || true
+ if [ -z "${snapshot_on_dev}" ] && [ -n "${luks_device}" ] && /sbin/cryptsetup status "${luks_device}" 1> /dev/null
+ then
+ /sbin/cryptsetup luksClose "${luks_device}"
+ fi
fi
- umount ${snap_backing}
fi
done
}
projects / live-boot-grml.git / blobdiff