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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
}
resolve_device() {
local major minor dev device=$1
case $device in
# resolve tag name to block device
UUID=*|LABEL=*)
dev=$(blkid -lt "$device" -o device)
[ -n "$device" ] && device=$dev
;;
esac
case $device in
/dev/*)
if poll_device "$device" "$rootdelay"; then
echo "$device"
return 0
fi
# block device, e.g. (/dev/sda1) -> /sys/class/block/sda1/dev
if [ -e /sys/class/block/${device:5}/dev ]; then
IFS=':' read major minor < "/sys/class/block/${device:5}/dev"
fi
;;
[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]|[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F])
# hex encoded major/minor, such as from LILO
major=$(( 0x0$device >> 8 ))
minor=$(( 0x0$device & 0xff ))
;;
0x[0-9a-fA-F][0-9a-fA-F]*)
major=$(( $device >> 8 ))
minor=$(( $device & 0xff ))
;;
esac
if [ -n "$major" -a -n "$minor" ]; then
device=/dev/root
msg "Creating device node with major $major and minor $minor." >&2
mknod "$device" b "$major" "$minor"
echo "$device"
return 0
fi
return 1
}
default_mount_handler() {
local rootdev
if ! rootdev=$(resolve_device "$root"); then
err "Unable to determine major/minor number of root device '$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
if ! mount ${fstype:+-t $fstype} -o ${rwopt:-ro}${rootflags:+,$rootflags} "$rootdev" "$1"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
}
# vim: set ft=sh ts=4 sw=4 et:
|
