/
live-helpers
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/
live-helpers
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# live-boot helper functions, used by live-boot on boot and by live-snapshot
if [ ! -x "/bin/fstype" ]
then
# klibc not in path -> not in initramfs
export PATH="${PATH}:/usr/lib/klibc/bin"
fi
# handle upgrade path from old udev (using udevinfo) to
# recent versions of udev (using udevadm info)
if [ -x /sbin/udevadm ]
then
udevinfo='/sbin/udevadm info'
else
udevinfo='udevinfo'
fi
sys2dev ()
{
sysdev=${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 "${sysblock}")
if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
[ -n "${white_listed_devices}" ] && \
echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
then
# skip this device entirely
continue
fi
for dev in $(subdevices "${sysblock}")
do
devname=$(sys2dev "${dev}")
if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
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}
if grep -q "^${device} " /proc/mounts
then
# return the first found
grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
fi
}
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=${opts}" > live-boot.log && return 0 )
fi
}
open_luks_device ()
{
dev="${1}"
name="$(basename ${dev})"
opts="--key-file=-"
if [ -n "${PERSISTENT_READONLY}" ]
then
opts="${opts} --readonly"
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
}
find_persistent_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 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 echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
/sbin/cryptsetup isLuks ${dev}
then
if luks_device=$(open_luks_device "${dev}")
then
dev="${luks_device}"
else
# skip $dev since we failed/chose not to open it
continue
fi
elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
then
# skip $dev since we don't allow unencrypted storage
continue
fi
if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
then
for label in ${overlays} ${snapshots}
do
if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
then
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
done
fi
if echo ${PERSISTENT_STORAGE} | grep -qe "\<file\>"
then
devfstype="$(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 label in ${overlays}
do
path=${backing}/${PERSISTENT_PATH}${label}
if [ -f "${path}" ]
then
overlays=$(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 "${luks_device}"
fi
fi
fi
done
}
get_mac ()
{
mac=""
for adaptor in /sys/class/net/*
do
status="$(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 ${mac}
}
is_luks()
{
devname="${1}"
if [ -x /sbin/cryptsetup ]
then
/sbin/cryptsetup isLuks "${devname}" 2>/dev/null || ret=${?}
return ${ret}
else
return 1
fi
}
removable_dev ()
{
output_format="${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 $rootmnt)).
# remove multiple /:s and ensure ending on /
local src_dir="$(echo "${1}"/ | sed -e 's|/\+|/|g')"
local dest_dir="$(echo "${2}"/ | sed -e 's|/\+|/|g')"
local src_mask="${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 x; do
local src="${x}"
local dest="${dest_dir}$(basename "${x}")"
if [ -d "${src}" ];
then
if [ -z "$(ls -A "${src}")" ];
then
continue
fi
if [ ! -d "${dest}" ];
then
mkdir -p "${dest}"
prev="$(dirname "${dest}")"
chown $(stat -c %u:%g "${prev}") "${dest}"
chmod $(stat -c %a "${prev}") "${dest}"
fi
link_files "${src}" "${dest}" "${src_mask}"
else
if [ -e "${dest}" ];
then
rm -rf "${dest}"
fi
if [ -n "${src}" ];
then
src="$(echo ${src} | sed "s|^${src_mask}||")"
fi
ln -s "${src}" "${dest}"
fi
done
}