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# This file contains common functions used in init and in hooks
msg () {
[ "${quiet}" != "y" ] && echo $@
}
err () {
echo "ERROR: $@"
}
poll_device() {
device="$1"
if [ "$2" -gt 0 ]; then
seconds="$2"
else
seconds=5
fi
echo "Waiting ${seconds} seconds for device ${device} ..."
while [ ! -b "${device}" -a ! -h "${device}" -a ${seconds} -gt 0 ]; do
sleep 1
seconds=$((${seconds}-1))
done
[ -b "${device}" -o -h "${device}" ]
}
launch_interactive_shell() {
export PS1='[ramfs \W]\$ '
[ "$1" = "--exec" ] && exec /bin/sh -i
/bin/sh -i
}
default_mount_handler() {
if [ ${root:0:5} != "/dev/" ] || ! poll_device "${root}" ${rootdelay}; then
msg "Root device '${root}' doesn't exist. Attempting to create it."
rootdev=""
if [ ${root:0:5} = "/dev/" ]; then
# It might be a block device (/dev/sda) -> /sys/block/sda/dev
# or a partition (/dev/sda1) -> /sys/block/sda/sda1/dev
for dir in /sys/block /sys/block/*; do
if [ -f ${dir}/${root:5}/dev ]; then
rootdev="$(cat ${dir}/${root:5}/dev | sed 's|:| |')"
break
fi
done
# It might be a major/minor pair (8:1)
elif echo ${root} | grep -q :; then
rootdev="$(echo ${root} | sed 's|:| |')"
root="/dev/root"
# It might be major/minor encoded as a single hex-number (lilo-style) (801)
elif [ ${#root} -le 4 -a ${#root} -gt 2 ] && echo "${root}" | grep -qe '^[A-Fa-f0-9]*$'; then
str_offset=$((${#root}-2))
major=$((0x${root:0:${str_offset}}))
minor=$((0x${root:${str_offset}}))
rootdev="${major} ${minor}"
root="/dev/root"
fi
if [ -n "${rootdev}" ]; then
msg "Creating root device ${root} with major $(echo "${rootdev}" | cut -d\ -f1) and minor $(echo "${rootdev}" | cut -d\ -f2)."
mknod ${root} b ${rootdev}
else
err "Unable to determine major/minor number of root device '${root}'."
echo "You are being dropped to a recovery shell"
echo " Type 'exit' to try and continue booting"
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
fi
# We didn't build filesystem support into busybox,
# instead we use util-linux-ng's blkid for best compatibility
if [ -n "${rootfstype}" ]; then
fstype="${rootfstype}"
else
fstype=$(eval $(/sbin/blkid -o udev -p "${root}"); echo $ID_FS_TYPE)
if [ -z "${fstype}" ]; then
err "Unable to determine the file system type of ${root}:"
echo "Either it contains no filesystem, an unknown filesystem,"
echo "or more than one valid file system signature was found."
echo
echo "Try adding"
echo " rootfstype=your_filesystem_type"
echo "to the kernel command line."
echo
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
fi
if [ "${readwrite}" = "yes" ]; then
rwopt="rw"
else
rwopt="ro"
fi
mount ${fstype:+-t ${fstype}} -o ${rwopt}${rootflags:+,${rootflags}} "${root}" "$1"
}
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