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live-helpers
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live-helpers
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# live-initramfs helper functions, used by live-initramfs 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 ${r}
}
is_supported_fs ()
{
fstype="${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 ()
{
# udev (>= 146) no longer provides vol_id
if [ -x /lib/udev/vol_id ]
then
# lenny
/lib/udev/vol_id -t ${1} 2>/dev/null
else
# squeeze
/sbin/blkid -s TYPE -o value $1 2>/dev/null
fi
}
where_is_mounted ()
{
device=${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=${6}
modprobe -q -b "${module}"
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="${options} -r"
fi
fi
if [ 0 -lt "${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=${opts}" > live.log && return 0 )
fi
}
find_cow_device ()
{
# Returns a device containing a partition labeled "${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
for dev in $(subdevices "${sysblock}")
do
devname=$(sys2dev "${dev}")
if echo "${black_listed_devices}" | grep -q "${devname}"
then
# skip this device enterely
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 "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
unset answer
break
fi
done
fi
# udev (>= 146) no longer provides vol_id
if [ -x /lib/udev/vol_id ]
then
# lenny
if [ "$(/lib/udev/vol_id -l ${devname} 2>/dev/null)" = "${pers_label}" ]
then
echo "${devname}"
return 0
fi
else
# squeeze
if [ "$(/sbin/blkid -s LABEL -o value $devname 2>/dev/null)" = "${pers_label}" ]
then
echo "${devname}"
return 0
fi
fi
if [ "${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
for dev in $(subdevices "${sysblock}")
do
devname=$(sys2dev "${dev}")
devfstype="$(get_fstype ${devname})"
if echo "${black_listed_devices}" | grep -q "${devname}"
then
# skip this device enterely
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 ${snap_backing}
fi
done
done
}
get_mac ()
{
mac=""
for adaptor in /sys/class/net/*
do
status="$(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
}