/
9990-misc-helpers.sh
executable file
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/
9990-misc-helpers.sh
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#!/bin/sh
#set -e
is_live_path ()
{
DIRECTORY="${1}"
if [ -d "${DIRECTORY}"/"${LIVE_MEDIA_PATH}" ]
then
for FILESYSTEM in squashfs ext2 ext3 ext4 xfs dir jffs2
do
if [ "$(echo ${DIRECTORY}/${LIVE_MEDIA_PATH}/*.${FILESYSTEM})" != "${DIRECTORY}/${LIVE_MEDIA_PATH}/*.${FILESYSTEM}" ]
then
return 0
fi
done
fi
return 1
}
matches_uuid ()
{
if [ "${IGNORE_UUID}" ] || [ ! -e /conf/uuid.conf ]
then
return 0
fi
path="${1}"
uuid="$(cat /conf/uuid.conf)"
for try_uuid_file in "${path}/.disk/live-uuid"*
do
[ -e "${try_uuid_file}" ] || continue
try_uuid="$(cat "${try_uuid_file}")"
if [ "${uuid}" = "${try_uuid}" ]
then
return 0
fi
done
return 1
}
get_backing_device ()
{
case "${1}" in
*.squashfs|*.ext2|*.ext3|*.ext4|*.jffs2)
echo $(setup_loop "${1}" "loop" "/sys/block/loop*" '0' "${LIVE_MEDIA_ENCRYPTION}" "${2}")
;;
*.dir)
echo "directory"
;;
*)
panic "Unrecognized live filesystem: ${1}"
;;
esac
}
match_files_in_dir ()
{
# Does any files match pattern ${1} ?
local pattern="${1}"
if [ "$(echo ${pattern})" != "${pattern}" ]
then
return 0
fi
return 1
}
mount_images_in_directory ()
{
directory="${1}"
rootmnt="${2}"
mac="${3}"
if match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.squashfs" ||
match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.ext2" ||
match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.ext3" ||
match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.ext4" ||
match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.jffs2" ||
match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.dir"
then
[ -n "${mac}" ] && adddirectory="${directory}/${LIVE_MEDIA_PATH}/${mac}"
setup_unionfs "${directory}/${LIVE_MEDIA_PATH}" "${rootmnt}" "${adddirectory}"
else
panic "No supported filesystem images found at /${LIVE_MEDIA_PATH}."
fi
}
is_nice_device ()
{
sysfs_path="${1#/sys}"
if /sbin/udevadm test-builtin path_id "${sysfs_path}" | egrep -q "ID_PATH=(usb|pci-[^-]*-(ide|sas|scsi|usb|virtio)|platform-sata_mv|platform-orion-ehci|platform-mmc|platform-mxsdhci)"
then
return 0
elif echo "${sysfs_path}" | grep -q '^/block/vd[a-z]$'
then
return 0
elif echo ${sysfs_path} | grep -q "^/block/dm-"
then
return 0
elif echo ${sysfs_path} | grep -q "^/block/mtdblock"
then
return 0
fi
return 1
}
check_dev ()
{
sysdev="${1}"
devname="${2}"
skip_uuid_check="${3}"
# support for fromiso=.../isofrom=....
if [ -n "$FROMISO" ]
then
ISO_DEVICE=$(dirname $FROMISO)
if ! [ -b $ISO_DEVICE ]
then
# to support unusual device names like /dev/cciss/c0d0p1
# as well we have to identify the block device name, let's
# do that for up to 15 levels
i=15
while [ -n "$ISO_DEVICE" ] && [ "$i" -gt 0 ]
do
ISO_DEVICE=$(dirname ${ISO_DEVICE})
[ -b "$ISO_DEVICE" ] && break
i=$(($i -1))
done
fi
if [ "$ISO_DEVICE" = "/" ]
then
echo "Warning: device for bootoption fromiso= ($FROMISO) not found.">>/boot.log
else
fs_type=$(get_fstype "${ISO_DEVICE}")
if is_supported_fs ${fs_type}
then
mkdir /live/fromiso
mount -t $fs_type "$ISO_DEVICE" /live/fromiso
ISO_NAME="$(echo $FROMISO | sed "s|$ISO_DEVICE||")"
loopdevname=$(setup_loop "/live/fromiso/${ISO_NAME}" "loop" "/sys/block/loop*" "" '')
devname="${loopdevname}"
else
echo "Warning: unable to mount $ISO_DEVICE." >>/boot.log
fi
fi
fi
if [ -z "${devname}" ]
then
devname=$(sys2dev "${sysdev}")
fi
if [ -d "${devname}" ]
then
mount -o bind "${devname}" $mountpoint || continue
if is_live_path $mountpoint
then
echo $mountpoint
return 0
else
umount $mountpoint
fi
fi
IFS=","
for device in ${devname}
do
case "$device" in
*mapper*)
# Adding lvm support
if [ -x /scripts/local-top/lvm2 ]
then
ROOT="$device" resume="" /scripts/local-top/lvm2
fi
;;
/dev/md*)
# Adding raid support
if [ -x /scripts/local-top/mdadm ]
then
cp /conf/conf.d/md /conf/conf.d/md.orig
echo "MD_DEVS=$device " >> /conf/conf.d/md
/scripts/local-top/mdadm
mv /conf/conf.d/md.orig /conf/conf.d/md
fi
;;
esac
done
unset IFS
[ -n "$device" ] && devname="$device"
[ -e "$devname" ] || continue
if [ -n "${LIVE_MEDIA_OFFSET}" ]
then
loopdevname=$(setup_loop "${devname}" "loop" "/sys/block/loop*" "${LIVE_MEDIA_OFFSET}" '')
devname="${loopdevname}"
fi
fstype=$(get_fstype "${devname}")
if is_supported_fs ${fstype}
then
devuid=$(blkid -o value -s UUID "$devname")
[ -n "$devuid" ] && grep -qs "\<$devuid\>" $tried && continue
mount -t ${fstype} -o ro,noatime "${devname}" ${mountpoint} || continue
[ -n "$devuid" ] && echo "$devuid" >> $tried
if [ -n "${FINDISO}" ]
then
if [ -f ${mountpoint}/${FINDISO} ]
then
umount ${mountpoint}
mkdir -p /live/findiso
mount -t ${fstype} -o ro,noatime "${devname}" /live/findiso
loopdevname=$(setup_loop "/live/findiso/${FINDISO}" "loop" "/sys/block/loop*" 0 "")
devname="${loopdevname}"
mount -t iso9660 -o ro,noatime "${devname}" ${mountpoint}
else
umount ${mountpoint}
fi
fi
if is_live_path ${mountpoint} && \
([ "${skip_uuid_check}" ] || matches_uuid ${mountpoint})
then
echo ${mountpoint}
return 0
else
umount ${mountpoint} 2>/dev/null
fi
fi
if [ -n "${LIVE_MEDIA_OFFSET}" ]
then
losetup -d "${loopdevname}"
fi
return 1
}
find_livefs ()
{
timeout="${1}"
# don't start autodetection before timeout has expired
if [ -n "${LIVE_MEDIA_TIMEOUT}" ]
then
if [ "${timeout}" -lt "${LIVE_MEDIA_TIMEOUT}" ]
then
return 1
fi
fi
# first look at the one specified in the command line
case "${LIVE_MEDIA}" in
removable-usb)
for sysblock in $(removable_usb_dev "sys")
do
for dev in $(subdevices "${sysblock}")
do
if check_dev "${dev}"
then
return 0
fi
done
done
return 1
;;
removable)
for sysblock in $(removable_dev "sys")
do
for dev in $(subdevices "${sysblock}")
do
if check_dev "${dev}"
then
return 0
fi
done
done
return 1
;;
*)
if [ ! -z "${LIVE_MEDIA}" ]
then
if check_dev "null" "${LIVE_MEDIA}" "skip_uuid_check"
then
return 0
fi
fi
;;
esac
# or do the scan of block devices
# prefer removable devices over non-removable devices, so scan them first
devices_to_scan="$(removable_dev 'sys') $(non_removable_dev 'sys')"
for sysblock in $devices_to_scan
do
devname=$(sys2dev "${sysblock}")
[ -e "$devname" ] || continue
fstype=$(get_fstype "${devname}")
if /lib/udev/cdrom_id ${devname} > /dev/null
then
if check_dev "null" "${devname}"
then
return 0
fi
elif is_nice_device "${sysblock}"
then
for dev in $(subdevices "${sysblock}")
do
if check_dev "${dev}"
then
return 0
fi
done
elif [ "${fstype}" = "squashfs" -o \
"${fstype}" = "btrfs" -o \
"${fstype}" = "ext2" -o \
"${fstype}" = "ext3" -o \
"${fstype}" = "ext4" -o \
"${fstype}" = "jffs2" ]
then
# This is an ugly hack situation, the block device has
# an image directly on it. It's hopefully
# live-boot, so take it and run with it.
ln -s "${devname}" "${devname}.${fstype}"
echo "${devname}.${fstype}"
return 0
fi
done
return 1
}
really_export ()
{
STRING="${1}"
VALUE="$(eval echo -n \${$STRING})"
if [ -f /live.vars ] && grep -sq "export ${STRING}" /live.vars
then
sed -i -e 's/\('${STRING}'=\).*$/\1'${VALUE}'/' /live.vars
else
echo "export ${STRING}=\"${VALUE}\"" >> /live.vars
fi
eval export "${STRING}"="${VALUE}"
}
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=${2}
local backing="${rootmnt}/lib/live/mount/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 dev="${2}"
local gpt_dev="${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 ${overlays}
do
if [ "${gpt_name}" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_fs_label ()
{
local overlays="${1}"
local dev="${2}"
for label in ${overlays}
do
if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_file_name ()
{
local overlays="${1}"
local dev="${2}"
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
if [ -n "${ret}" ]
then
echo ${ret}
else
# unmount and remove mountpoint
umount ${backing} > /dev/null 2>&1 || true
rmdir ${backing} > /dev/null 2>&1 || true
fi
}
find_persistence_media ()
{
# Scans devices for overlays, and returns a whitespace
# separated list of how to use them. Only overlays with a partition
# label or file name in ${overlays} are returned.
#
# When scanning a LUKS device, the user will be asked to enter the
# passphrase; on failure to enter it, or if no persistence partitions
# or files were found, the LUKS device is closed.
#
# For all other cases (overlay partition and overlay file) the
# return value is "${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 white_listed_devices="${2}"
local ret=""
local black_listed_devices="$(what_is_mounted_on ${rootmnt}/lib/live/medium)"
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}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi
result=$(probe_for_fs_label "${overlays}" ${dev})
if [ -n "${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}" ${dev})
if [ -n "${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
}