/
misc-helpers.sh
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/
misc-helpers.sh
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#!/bin/sh
#set -e
is_in_list_separator_helper () {
local sep=${1}
shift
local element=${1}
shift
local list=${*}
echo ${list} | grep -qe "^\(.*${sep}\)\?${element}\(${sep}.*\)\?$"
}
is_in_space_sep_list () {
local element=${1}
shift
is_in_list_separator_helper "[[:space:]]" "${element}" "${*}"
}
is_in_comma_sep_list () {
local element=${1}
shift
is_in_list_separator_helper "," "${element}" "${*}"
}
sys2dev ()
{
sysdev=${1#/sys}
echo "/dev/$($udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
}
subdevices ()
{
sysblock=${1}
r=""
for dev in "${sysblock}"/* "${sysblock}"
do
if [ -e "${dev}/dev" ]
then
r="${r} ${dev}"
fi
done
echo ${r}
}
storage_devices()
{
black_listed_devices="${1}"
white_listed_devices="${2}"
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "loop|ram|fd")
do
fulldevname=$(sys2dev "${sysblock}")
if is_in_space_sep_list ${fulldevname} ${black_listed_devices} || \
[ -n "${white_listed_devices}" ] && \
! is_in_space_sep_list ${fulldevname} ${white_listed_devices}
then
# skip this device entirely
continue
fi
for dev in $(subdevices "${sysblock}")
do
devname=$(sys2dev "${dev}")
if is_in_space_sep_list ${devname} ${black_listed_devices}
then
# skip this subdevice
continue
else
echo "${devname}"
fi
done
done
}
is_supported_fs ()
{
fstype="${1}"
# Validate input first
if [ -z "${fstype}" ]
then
return 1
fi
# Try to look if it is already supported by the kernel
if grep -q ${fstype} /proc/filesystems
then
return 0
else
# Then try to add support for it the gentle way using the initramfs capabilities
modprobe ${fstype}
if grep -q ${fstype} /proc/filesystems
then
return 0
# Then try the hard way if /root is already reachable
else
kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
if [ -e "${kmodule}" ]
then
insmod "${kmodule}"
if grep -q ${fstype} /proc/filesystems
then
return 0
fi
fi
fi
fi
return 1
}
get_fstype ()
{
/sbin/blkid -s TYPE -o value $1 2>/dev/null
}
where_is_mounted ()
{
device=${1}
# return first found
grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
}
trim_path () {
# remove all unnecessary /:s in the path, including last one (except
# if path is just "/")
echo ${1} | sed 's|//\+|/|g' | sed 's|^\(.*[^/]\)/$|\1|'
}
what_is_mounted_on ()
{
local dir="$(trim_path ${1})"
grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
}
chown_ref ()
{
local reference="${1}"
shift
local targets=${@}
local owner=$(stat -c %u:%g "${reference}")
chown -h ${owner} ${targets}
}
chmod_ref ()
{
local reference="${1}"
shift
local targets=${@}
local rights=$(stat -c %a "${reference}")
chmod ${rights} ${targets}
}
lastline ()
{
while read lines
do
line=${lines}
done
echo "${line}"
}
base_path ()
{
testpath="${1}"
mounts="$(awk '{print $2}' /proc/mounts)"
testpath="$(busybox realpath ${testpath})"
while true
do
if echo "${mounts}" | grep -qs "^${testpath}"
then
set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
echo ${1}
break
else
testpath=$(dirname $testpath)
fi
done
}
fs_size ()
{
# Returns used/free fs kbytes + 5% more
# You could pass a block device as ${1} or the mount point as ${2}
dev="${1}"
mountp="${2}"
used="${3}"
if [ -z "${mountp}" ]
then
mountp="$(where_is_mounted ${dev})"
if [ -z "${mountp}" ]
then
mountp="/mnt/tmp_fs_size"
mkdir -p "${mountp}"
mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
doumount=1
fi
fi
if [ "${used}" = "used" ]
then
size=$(du -ks ${mountp} | cut -f1)
size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
else
# free space
size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
fi
if [ -n "${doumount}" ]
then
umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
rmdir "${mountp}"
fi
echo "${size}"
}
load_keymap ()
{
# Load custom keymap
if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
then
loadkeys /etc/boottime.kmap.gz
fi
}
setup_loop ()
{
local fspath=${1}
local module=${2}
local pattern=${3}
local offset=${4}
local encryption=${5}
local readonly=${6}
# the output of setup_loop is evaluated in other functions,
# modprobe leaks kernel options like "libata.dma=0"
# as "options libata dma=0" on stdout, causing serious
# problems therefor, so instead always avoid output to stdout
modprobe -q -b "${module}" 1>/dev/null
udevadm settle
for loopdev in ${pattern}
do
if [ "$(cat ${loopdev}/size)" -eq 0 ]
then
dev=$(sys2dev "${loopdev}")
options=''
if [ -n "${readonly}" ]
then
if losetup --help 2>&1 | grep -q -- "-r\b"
then
options="${options} -r"
fi
fi
if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
then
options="${options} -o ${offset}"
fi
if [ -z "${encryption}" ]
then
losetup ${options} "${dev}" "${fspath}"
else
# Loop AES encryption
while true
do
load_keymap
echo -n "Enter passphrase for root filesystem: " >&6
read -s passphrase
echo "${passphrase}" > /tmp/passphrase
unset passphrase
exec 9</tmp/passphrase
/sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
error=${?}
exec 9<&-
rm -f /tmp/passphrase
if [ 0 -eq ${error} ]
then
unset error
break
fi
echo
echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
read answer
if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
unset answer
break
fi
done
fi
echo "${dev}"
return 0
fi
done
panic "No loop devices available"
}
try_mount ()
{
dev="${1}"
mountp="${2}"
opts="${3}"
fstype="${4}"
old_mountp="$(where_is_mounted ${dev})"
if [ -n "${old_mountp}" ]
then
if [ "${opts}" != "ro" ]
then
mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
fi
mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
else
if [ -z "${fstype}" ]
then
fstype=$(get_fstype "${dev}")
fi
mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > boot.log && return 0 )
fi
}
mount_persistence_media ()
{
local device=${1}
local probe=${2}
local backing="/live/persistence/$(basename ${device})"
mkdir -p "${backing}"
local old_backing="$(where_is_mounted ${device})"
if [ -z "${old_backing}" ]
then
local fstype="$(get_fstype ${device})"
local mount_opts="rw,noatime"
if [ -n "${PERSISTENCE_READONLY}" ]
then
mount_opts="ro,noatime"
fi
if mount -t "${fstype}" -o "${mount_opts}" "${device}" "${backing}" >/dev/null
then
echo ${backing}
return 0
else
[ -z "${probe}" ] && log_warning_msg "Failed to mount persistence media ${device}"
rmdir "${backing}"
return 1
fi
elif [ "${backing}" != "${old_backing}" ]
then
if mount --move ${old_backing} ${backing} >/dev/null
then
echo ${backing}
return 0
else
[ -z "${probe}" ] && log_warning_msg "Failed to move persistence media ${device}"
rmdir "${backing}"
return 1
fi
fi
return 0
}
close_persistence_media () {
local device=${1}
local backing="$(where_is_mounted ${device})"
if [ -d "${backing}" ]
then
umount "${backing}" >/dev/null 2>&1
rmdir "${backing}" >/dev/null 2>&1
fi
if is_active_luks_mapping ${device}
then
/sbin/cryptsetup luksClose ${device}
fi
}
open_luks_device ()
{
dev="${1}"
name="$(basename ${dev})"
opts="--key-file=-"
if [ -n "${PERSISTENCE_READONLY}" ]
then
opts="${opts} --readonly"
fi
if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
then
re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
if [ "${opened_dev}" = "${dev}" ]
then
luks_device="/dev/mapper/${name}"
echo ${luks_device}
return 0
else
log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
return 1
fi
fi
load_keymap
while true
do
/lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
/sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
if [ 0 -eq ${?} ]
then
luks_device="/dev/mapper/${name}"
echo ${luks_device}
return 0
fi
echo >&6
echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
read answer
if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
return 2
fi
done
}
get_gpt_name ()
{
local dev="${1}"
/sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
}
is_gpt_device ()
{
local dev="${1}"
[ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
}
probe_for_gpt_name ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
local gpt_dev="${dev}"
if is_active_luks_mapping ${dev}
then
# if $dev is an opened luks device, we need to check
# GPT stuff on the backing device
gpt_dev=$(get_luks_backing_device "${dev}")
fi
if ! is_gpt_device ${gpt_dev}
then
return
fi
local gpt_name=$(get_gpt_name ${gpt_dev})
for label in ${overlays} ${snapshots}
do
if [ "${gpt_name}" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_fs_label ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
for label in ${overlays} ${snapshots}
do
if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_file_name ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
local ret=""
local backing="$(mount_persistence_media ${dev} probe)"
if [ -z "${backing}" ]
then
return
fi
for label in ${overlays}
do
path=${backing}/${PERSISTENCE_PATH}${label}
if [ -f "${path}" ]
then
local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
ret="${ret} ${label}=${loopdev}"
fi
done
for label in ${snapshots}
do
for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
do
path="${PERSISTENCE_PATH}${label}.${ext}"
if [ -f "${backing}/${path}" ]
then
ret="${ret} ${label}=${dev}:${backing}:${path}"
fi
done
done
if [ -n "${ret}" ]
then
echo ${ret}
else
umount ${backing} > /dev/null 2>&1 || true
fi
}
find_persistence_media ()
{
# 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 persistence 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
# ${white_list_devices} is non-empty, only devices in it will be
# scanned.
local overlays="${1}"
local snapshots="${2}"
local white_listed_devices="${3}"
local ret=""
local black_listed_devices="$(what_is_mounted_on /live/image)"
for dev in $(storage_devices "${black_listed_devices}" "${white_listed_devices}")
do
local result=""
local luks_device=""
# Check if it's a luks device; we'll have to open the device
# in order to probe any filesystem it contains, like we do
# below. activate_custom_mounts() also depends on that any luks
# device already has been opened.
if is_in_comma_sep_list luks ${PERSISTENCE_ENCRYPTION} && \
is_luks_partition ${dev}
then
if luks_device=$(open_luks_device "${dev}")
then
dev="${luks_device}"
else
# skip $dev since we failed/chose not to open it
continue
fi
elif ! is_in_comma_sep_list none ${PERSISTENCE_ENCRYPTION}
then
# skip $dev since we don't allow unencrypted storage
continue
fi
# Probe for matching GPT partition names or filesystem labels
if is_in_comma_sep_list filesystem ${PERSISTENCE_STORAGE}
then
result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi
result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi
fi
# Probe for files with matching name on mounted partition
if is_in_comma_sep_list file ${PERSISTENCE_STORAGE}
then
result=$(probe_for_file_name "${overlays}" "${snapshots}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi
fi
# Close luks device if it isn't used
if [ -z "${result}" ] && [ -n "${luks_device}" ] && \
is_active_luks_mapping "${luks_device}"
then
/sbin/cryptsetup luksClose "${luks_device}"
fi
done
if [ -n "${ret}" ]
then
echo ${ret}
fi
}
get_mac ()
{
mac=""
for adaptor in /sys/class/net/*
do
status="$(cat ${adaptor}/iflink)"
if [ "${status}" -eq 2 ]
then
mac="$(cat ${adaptor}/address)"
mac="$(echo ${mac} | sed 's/:/-/g' | tr '[a-z]' '[A-Z]')"
fi
done
echo ${mac}
}
is_luks_partition ()
{
device="${1}"
/sbin/cryptsetup isLuks "${device}" 1>/dev/null 2>&1
}
is_active_luks_mapping ()
{
device="${1}"
/sbin/cryptsetup status "${device}" 1>/dev/null 2>&1
}
get_luks_backing_device () {
device=${1}
cryptsetup status ${device} 2> /dev/null | \
awk '{if ($1 == "device:") print $2}'
}
removable_dev ()
{
output_format="${1}"
want_usb="${2}"
ret=
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
do
dev_ok=
if [ "$(cat ${sysblock}/removable)" = "1" ]
then
if [ -z "${want_usb}" ]
then
dev_ok="yes"
else
if readlink ${sysblock} | grep -q usb
then
dev_ok="yes"
fi
fi
fi
if [ "${dev_ok}" = "yes" ]
then
case "${output_format}" in
sys)
ret="${ret} ${sysblock}"
;;
*)
devname=$(sys2dev "${sysblock}")
ret="${ret} ${devname}"
;;
esac
fi
done
echo "${ret}"
}
removable_usb_dev ()
{
output_format="${1}"
removable_dev "${output_format}" "want_usb"
}
non_removable_dev ()
{
output_format="${1}"
ret=
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
do
if [ "$(cat ${sysblock}/removable)" = "0" ]
then
case "${output_format}" in
sys)
ret="${ret} ${sysblock}"
;;
*)
devname=$(sys2dev "${sysblock}")
ret="${ret} ${devname}"
;;
esac
fi
done
echo "${ret}"
}
link_files ()
{
# create source's directory structure in dest, and recursively
# create symlinks in dest to to all files in source. if mask
# is non-empty, remove mask from all source paths when
# creating links (will be necessary if we change root, which
# live-boot normally does (into $rootmnt)).
# remove multiple /:s and ensure ending on /
local src_dir="$(trim_path ${1})/"
local dest_dir="$(trim_path ${2})/"
local src_mask="${3}"
# This check can only trigger on the inital, non-recursive call since
# we create the destination before recursive calls
if [ ! -d "${dest_dir}" ]
then
log_warning_msg "Must link_files into a directory"
return
fi
find "${src_dir}" -mindepth 1 -maxdepth 1 | while read src; do
local dest="${dest_dir}$(basename "${src}")"
if [ -d "${src}" ]
then
if [ -z "$(ls -A "${src}")" ]
then
continue
fi
if [ ! -d "${dest}" ]
then
mkdir -p "${dest}"
chown_ref "${src}" "${dest}"
chmod_ref "${src}" "${dest}"
fi
link_files "${src}" "${dest}" "${src_mask}"
else
local final_src=${src}
if [ -n "${src_mask}" ]
then
final_src="$(echo ${final_src} | sed "s|^${src_mask}||")"
fi
rm -rf "${dest}" 2> /dev/null
ln -s "${final_src}" "${dest}"
chown_ref "${src}" "${dest}"
fi
done
}
do_union ()
{
local unionmountpoint="${1}" # directory where the union is mounted
local unionrw="${2}" # branch where the union changes are stored
local unionro1="${3}" # first underlying read-only branch (optional)
local unionro2="${4}" # second underlying read-only branch (optional)
if [ "${UNIONTYPE}" = "aufs" ]
then
rw_opt="rw"
ro_opt="rr+wh"
noxino_opt="noxino"
elif [ "${UNIONTYPE}" = "unionfs-fuse" ]
then
rw_opt="RW"
ro_opt="RO"
else
rw_opt="rw"
ro_opt="ro"
fi
case "${UNIONTYPE}" in
unionfs-fuse)
unionmountopts="-o cow -o noinitgroups -o default_permissions -o allow_other -o use_ino -o suid"
unionmountopts="${unionmountopts} ${unionrw}=${rw_opt}"
if [ -n "${unionro1}" ]
then
unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
fi
if [ -n "${unionro2}" ]
then
unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
fi
( sysctl -w fs.file-max=391524 ; ulimit -HSn 16384
unionfs-fuse ${unionmountopts} "${unionmountpoint}" ) && \
( mkdir -p /run/sendsigs.omit.d
pidof unionfs-fuse >> /run/sendsigs.omit.d/unionfs-fuse || true )
;;
overlayfs)
# XXX: can unionro2 be used? (overlayfs only handles two dirs, but perhaps they can be chained?)
# XXX: and can unionro1 be optional? i.e. can overlayfs skip lowerdir?
unionmountopts="-o noatime,lowerdir=${unionro1},upperdir=${unionrw}"
mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
;;
*)
unionmountopts="-o noatime,${noxino_opt},dirs=${unionrw}=${rw_opt}"
if [ -n "${unionro1}" ]
then
unionmountopts="${unionmountopts}:${unionro1}=${ro_opt}"
fi
if [ -n "${unionro2}" ]
then
unionmountopts="${unionmountopts}:${unionro2}=${ro_opt}"
fi
mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
;;
esac
}
get_custom_mounts ()
{
# Side-effect: leaves $devices with live-persistence.conf mounted in /live/persistence
# Side-effect: prints info to file $custom_mounts
local custom_mounts=${1}
shift
local devices=${@}
local bindings="/tmp/bindings.list"
local links="/tmp/links.list"
rm -rf ${bindings} ${links} 2> /dev/null
for device in ${devices}
do
if [ ! -b "${device}" ]
then
continue
fi
local device_name="$(basename ${device})"
local backing=$(mount_persistence_media ${device})
if [ -z "${backing}" ]
then
continue
fi
local include_list="${backing}/${persistence_list}"
if [ ! -r "${include_list}" ]
then
continue
fi
if [ -n "${DEBUG}" ] && [ -e "${include_list}" ]
then
cp ${include_list} /live/persistence/${persistence_list}.${device_name}
fi
while read dir options # < ${include_list}
do
if echo ${dir} | grep -qe "^[[:space:]]*\(#.*\)\?$"
then
# skipping empty or commented lines
continue
fi
if trim_path ${dir} | grep -q -e "^[^/]" -e "^/live\(/.*\)\?$" -e "^/\(.*/\)\?\.\.\?\(/.*\)\?$"
then
log_warning_msg "Skipping unsafe custom mount ${dir}: must be an absolute path containing neither the \".\" nor \"..\" special dirs, and cannot be \"/live\" or any sub-directory therein."
continue
fi
local opt_source=""
local opt_link=""
for opt in $(echo ${options} | tr ',' ' ');
do
case "${opt}" in
source=*)
opt_source=${opt#source=}
;;
link)
opt_link="yes"
;;
union|bind)
;;
*)
log_warning_msg "Skipping custom mount with unkown option: ${opt}"
continue 2
;;
esac
done
local source="${dir}"
if [ -n "${opt_source}" ]
then
if echo ${opt_source} | grep -q -e "^/" -e "^\(.*/\)\?\.\.\?\(/.*\)\?$" && [ "${source}" != "." ]
then
log_warning_msg "Skipping unsafe custom mount with option source=${opt_source}: must be either \".\" (the media root) or a relative path w.r.t. the media root that contains neither comas, nor the special \".\" and \"..\" path components"
continue
else
source="${opt_source}"
fi
fi
local full_source="$(trim_path ${backing}/${source})"
local full_dest="$(trim_path ${rootmnt}/${dir})"
if [ -n "${opt_link}" ]
then
echo "${device} ${full_source} ${full_dest} ${options}" >> ${links}
else
echo "${device} ${full_source} ${full_dest} ${options}" >> ${bindings}
fi
done < ${include_list}
done
# We sort the list according to destination so we're sure that
# we won't hide a previous mount. We also ignore duplicate
# destinations in a more or less arbitrary way.
[ -e "${bindings}" ] && sort -k3 -sbu ${bindings} >> ${custom_mounts} && rm ${bindings}
# After all mounts are considered we add symlinks so they
# won't be hidden by some mount.
[ -e "${links}" ] && cat ${links} >> ${custom_mounts} && rm ${links}
# We need to make sure that no two custom mounts have the same sources
# or are nested; if that is the case, too much weird stuff can happen.
local prev_source="impossible source" # first iteration must not match
local prev_dest=""
# This sort will ensure that a source /a comes right before a source
# /a/b so we only need to look at the previous source
sort -k2 -b ${custom_mounts} |
while read device source dest options
do
if echo ${source} | grep -qe "^${prev_source}\(/.*\)\?$"
then
panic "Two persistence mounts have the same or nested sources: ${source} on ${dest}, and ${prev_source} on ${prev_dest}"
fi
prev_source=${source}
prev_dest=${dest}
done
}
activate_custom_mounts ()
{
local custom_mounts="${1}" # the ouput from get_custom_mounts()
local used_devices=""
while read device source dest options # < ${custom_mounts}
do
local opt_bind="yes"
local opt_link=""
local opt_union=""
for opt in $(echo ${options} | tr ',' ' ');
do