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# This file contains common functions used in init and in hooks
msg () {
[ "${quiet}" != "y" ] && echo $@
}
err () {
echo "ERROR: $@"
}
poll_device() {
local device=$1 seconds=${2//[!0-9]}
[ -z "$seconds" ] && seconds=5
[ -b "$device" ] && return 0
if [ "$udevd_running" -eq 1 ]; then
msg "Waiting $seconds seconds for device $device ..."
while [ ! -b "$device" -a "$seconds" -gt 0 ]; do
sleep 1
seconds=$(( $seconds - 1 ))
done
fi
[ -b "$device" ]
}
launch_interactive_shell() {
export PS1='[ramfs \W]\$ '
[ "$1" = "--exec" ] && exec sh -i
sh -i
}
parse_cmdline() {
local w in_quotes lhs rhs
in_quotes=0
for w in $(cat /proc/cmdline); do
if [ ${in_quotes} -eq 0 ]; then
case "${w}" in
\#*) break ;; # ignore everything after a # in the commandline
# The kernel passes those to init on its own
[0123456Ss]) ;;
single) ;;
rw|ro) rwopt="$w" ;;
# only export stuff that does work with ash :)
=*) ;;
*=*) rhs=${w#*=}
lhs=${w%%=*}
lhs=${lhs//[-.]/_}
if [ '"' = "${rhs:0:1}" ]; then
if [ "${rhs:$((${#rhs}-1))}" = '"' ]; then
rhs="${rhs:1:$((${#rhs}-2))}"
else
rhs="${rhs:1}"
in_quotes=1
continue
fi
fi
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=\${rhs}
;;
*) lhs=${w//[-.]/_}
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=y
;;
esac
else
if [ '"' = "${w:$((${#w}-1))}" ]; then
rhs="${rhs} ${w%\"}"
in_quotes=0
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=\${rhs}
else
rhs="${rhs} ${w}"
fi
fi
done
}
default_mount_handler() {
# resolve tag name to block device
if [ "${root:0:5}" = 'UUID=' ] || [ "${root:0:6}" = 'LABEL=' ]; then
device=$(blkid -l -t "$root" -o device)
if [ -n "$device" ]; then
root=$device
fi
unset device
fi
if [ ${root:0:5} != "/dev/" ] || ! poll_device "${root}" ${rootdelay}; then
msg "Root device '${root}' doesn't exist. Attempting to create it."
major=""
minor=""
if [ ${devtmpfs_mounted} -eq 0 -a ${root:0:5} = "/dev/" ]; then
# It might be a block device (/dev/sda) -> /sys/class/block/sda/dev
if [ -e /sys/class/block/${root:5}/dev ]; then
IFS=':' read major minor < "/sys/class/block/${root:5}/dev"
break
fi
# It might be a major/minor pair (8:1)
elif [ "$root" != "${root/:}" ]; then
major="$(echo ${root} | cut -d: -f1)"
minor="$(echo ${root} | cut -d: -f2)"
root="/dev/root"
# It might be major/minor encoded as a single hex-number (lilo-style) (801)
elif [ ${#root} -le 4 -a ${#root} -gt 2 -a -z "${root//[0-9a-fA-F]}" ]; then
str_offset=$((${#root}-2))
major=$((0x${root:0:${str_offset}}))
minor=$((0x${root:${str_offset}}))
root="/dev/root"
fi
if [ -n "${major}" -a -n "${minor}" ]; then
msg "Creating root device ${root} with major ${major} and minor ${minor}."
mknod ${root} b ${major} ${minor}
else
err "Unable to determine major/minor number of root device '${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's blkid for best compatibility
fstype=${rootfstype:-$(blkid -u filesystem -o value -s TYPE -p "$root")}
if [ -z "$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
mount ${fstype:+-t $fstype} -o ${rwopt:-ro}${rootflags:+,$rootflags} "$root" "$1"
}
# vim: set ft=sh ts=4 sw=4 et:
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