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## Casper helper functions, used by casper on boot and by casper-snapshot
if [ "${BUILD_SYSTEM}" == "Ubuntu" ]; then
MP_QUIET="-Q"
else
MP_QUIET="-q"
fi
sys2dev() {
sysdev=${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}
}
where_is_mounted() {
device=$1
if grep -q "^$device " /proc/mounts; then
grep "^$device " /proc/mounts | read d mountpoint rest
echo $mountpoint
return 0
fi
return 1
}
lastline() {
while read lines ; do
line=${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
}
used_fs_size ()
{
# Returns used fs kbytes + 5% more
# You could pass a block device as $1 or the mount point as $2
dev="${1}"
mountp="${2}"
if [ -z "${mountp}" ]; then
mountp=$(where_is_mounted "${dev}")
if [ "$?" -gt 0 ]; then
mountp=/mnt/tmp_fs_size
mkdir -p "${mountp}"
mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}"
doumount=1
fi
fi
size=$(du -ks ${mountp} | cut -f1)
size=$(expr ${size} + ${size}/20 ) # FIXME: 5% more to be sure
needed_space=$(expr ${size} * 1024)
if [ ! -z "${doumount}" ]; then
umount "${mountp}"
rmdir "${mountp}"
fi
echo "${needed_space}"
}
setup_loop() {
local fspath=$1
local module=$2
local pattern=$3
modprobe "${MP_QUIET}" -b "$module"
udevsettle
for loopdev in $pattern; do
if [ "$(cat $loopdev/size)" -eq 0 ]; then
dev=$(sys2dev "${loopdev}")
losetup "$dev" "$fspath"
echo "$dev"
return 0
fi
done
panic "No loop devices available"
}
try_mount ()
{
dev="${1}"
mountp="${2}"
opts="${3}"
if where_is_mounted ${dev} > /dev/null; then
mount -o remount,"${opts}" ${dev} $(where_is_mounted ${dev}) || panic "Remounting failed"
mount -o bind $(where_is_mounted ${dev}) ${mountp} || panic "Cannot bind-mount"
else
mount -t $(get_fstype "${dev}") -o "${opts}" "${dev}" "${mountp}" || panic "Cannot mount ${dev} on ${mountp}"
fi
}
find_cow_device() {
pers_label="${1}"
cow_backing="/${pers_label}-backing"
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do
for dev in $(subdevices "${sysblock}"); do
devname=$(sys2dev "${dev}")
if [ "$(/lib/udev/vol_id -l $devname 2>/dev/null)" = "${pers_label}" ]; then
echo "$devname"
return
elif [ "$(get_fstype ${devname})" = "vfat" ]; then # FIXME: all supported block devices should be scanned
mkdir -p "${cow_backing}"
try_mount "${devname}" "${cow_backing}" "rw"
if [ -e "${cow_backing}/${pers_label}" ]; then
echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*")
return 0
else
umount ${cow_backing}
fi
fi
done
done
}
find_files()
# return the first of $filenames found on vfat and ext2 devices
# FIXME: merge with above function
{
filenames="${1}"
snap_backing="/snap-backing"
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do
for dev in $(subdevices "${sysblock}"); do
devname=$(sys2dev "${dev}")
devfstype="$(get_fstype ${devname})"
if [ "${devfstype}" = "vfat" ] || [ "${devfstype}" = "ext2" ] ; then # FIXME: all supported block devices should be scanned
mkdir -p "${snap_backing}"
try_mount "${devname}" "${snap_backing}" "ro"
for filename in ${filenames}; do
if [ -e "${snap_backing}/${filename}" ]; then
echo "${devname} ${snap_backing} ${filename}"
return 0
fi
done
umount ${snap_backing}
fi
done
done
}
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