df7f341ba1
- Removed support for snapshots. - Removed support for multiple images, we only support one by default "filesystem.squashfs". - Make all vars local to funcs.
130 lines
2.9 KiB
Text
130 lines
2.9 KiB
Text
## Casper helper functions, used by casper on boot.
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MP_QUIET="-q"
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sys2dev()
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{
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sysdev=${1#/sys}
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echo "/dev/$(/sbin/udevadm info -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
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}
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subdevices()
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{
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sysblock=$1
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r=""
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for dev in "${sysblock}" "${sysblock}"/*; do
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if [ -e "${dev}/dev" ]; then
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r="${r} ${dev}"
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fi
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done
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echo ${r}
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}
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is_supported_fs()
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{
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# FIXME: do something better like the scan of supported filesystems
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fstype="${1}"
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case ${fstype} in
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vfat|iso9660|udf|ext2|ext3|ext4|ntfs)
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return 0
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;;
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esac
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return 1
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}
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get_fstype()
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{
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/sbin/blkid -s TYPE -o value $1 2>/dev/null
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}
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where_is_mounted()
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{
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device=$1
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if grep -q "^$device " /proc/mounts; then
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mountpoint="$(grep "^$device " /proc/mounts | awk '{print $2; exit}')"
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grep "^$device " /proc/mounts | read d mountpoint rest
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echo $mountpoint
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return 0
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fi
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return 1
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}
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fs_size()
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{
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# Returns used/free fs kbytes + 5% more
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# You could pass a block device as $1 or the mount point as $2
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dev="${1}"
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mountp="${2}"
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used="${3}"
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if [ -z "${mountp}" ]; then
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mountp=$(where_is_mounted "${dev}")
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if [ "$?" -gt 0 ]; then
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mountp="/mnt/tmp_fs_size"
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mkdir -p "${mountp}"
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mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}"
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doumount=1
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fi
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fi
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if [ "${used}" = "used" ]; then
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size=$(du -ks ${mountp} | cut -f1)
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size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
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else
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# free space
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size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
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fi
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if [ -n "${doumount}" ]; then
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umount "${mountp}"
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rmdir "${mountp}"
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fi
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echo "${size}"
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}
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setup_loop() {
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local fspath=$1
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local module=$2
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local pattern=$3
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local offset=$4
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modprobe ${MP_QUIET} -b "$module"
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/sbin/udevadm settle
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if [ "$module" = loop ]; then
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if [ ! -e /dev/loop0 ]; then
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# temporary workaround for kernel bug
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for i in 0 1 2 3 4 5 6 7; do
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mknod "/dev/loop$i" b 7 "$i" || true
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done
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fi
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dev="$(losetup -f)"
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if [ "$dev" ]; then
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if [ -n "$offset" ]; then
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losetup -o "$offset" "$dev" "$fspath"
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else
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losetup "$dev" "$fspath"
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fi
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echo "$dev"
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return 0
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else
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panic "No loop devices available"
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fi
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else
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for loopdev in $pattern; do
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if [ "$(cat $loopdev/size)" -eq 0 ]; then
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dev=$(sys2dev "${loopdev}")
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if [ -n "$offset" ]; then
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losetup -o "$offset" "$dev" "$fspath"
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else
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losetup "$dev" "$fspath"
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fi
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echo "$dev"
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return 0
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fi
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done
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panic "No loop devices available"
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fi
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}
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