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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 $device ..." >&2
while [ ! -b "$device" -a "$seconds" -gt 0 ]; do
sleep 1
seconds=$(( $seconds - 1 ))
done
fi
[ -b "$device" ]
}
launch_interactive_shell() {
export PS1='[rootfs \W]\$ '
[ "$1" = "--exec" ] && exec sh -i
sh -i
}
major_minor_to_device() {
local dev
[ -e "/sys/dev/block/$1:$2" ] || return 1
if dev=$(readlink -f "/sys/dev/block/$1:$2" 2>/dev/null); then
echo "/dev/${dev##*/}"
return 0
fi
return 1
}
parse_cmdline() {
local w in_quotes lhs rhs
in_quotes=0
for w in $(cat /proc/cmdline); do
if [ "$in_quotes" = 0 ]; then
case "$w" in
# ignore everything after a # in the commandline
\#*) break ;;
# special cases
rw|ro) rwopt=$w ;;
fsck.mode=*)
case ${w#*=} in
force) forcefsck=y ;;
skip) fastboot=y ;;
esac
;;
# abide by shell variable naming rules
[[:alpha:]_]*=*)
rhs=${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
eval $lhs=\$rhs
;;
[[:alpha:]_]*)
lhs=${w//[-.]/_}
eval $lhs=y
;;
esac
else
if [ '"' = "${w:$((${#w}-1))}" ]; then
rhs="$rhs ${w%\"}"
in_quotes=0
eval $lhs=\$rhs
else
rhs="$rhs $w"
fi
fi
done
}
fsck_device() {
[ -x /sbin/fsck ] || return 255
if [ ! -b "$1" ]; then
err "device '$1' not found. Skipping fsck."
return 255
fi
if [ -n "$fastboot" ]; then
msg ":: skipping fsck on '$1'"
return
fi
msg ":: performing fsck on '$1'"
fsck -Ta -C"$FSCK_FD" "$1" -- ${forcefsck+-f}
}
fsck_root() {
fsck_device "$root"
fsckret=$?
fsck_ret() {
[ -z "$fsckret" ] && return 1
[ "$fsckret" -eq "$1" ] && return 0
[ "$(( $fsckret & $1 ))" -eq "$1" ]
}
if [ "$fsckret" -ne 255 ]; then
if [ "$fsckret" = '0' ] || fsck_ret 1; then
echo "$fsckret" > /run/initramfs/root-fsck
elif fsck_ret 4; then
err "Bailing out. Run 'fsck $root' manually"
printf '%s\n' \
"********** FILESYSTEM CHECK FAILED **********" \
"* *" \
"* Please run fsck manually. After leaving *" \
"* this maintenance shell, the system will *" \
"* reboot automatically. *" \
"* *" \
"*********************************************"
launch_interactive_shell
echo ":: Automatic reboot in progress"
sleep 2
reboot -f
elif fsck_ret 2; then
printf '%s\n' \
"************** REBOOT REQUIRED **************" \
"* *" \
"* automatically restarting in 10 seconds *" \
"* *" \
"*********************************************"
sleep 10
reboot -f
elif fsck_ret 8; then
err "fsck failed on '$root'"
elif fsck_ret 16; then
err "Failed to invoke fsck: usage or syntax error"
elif fsck_ret 32; then
echo ":: fsck cancelled on user request"
elif fsck_ret 128; then
err "fatal error invoking fsck"
fi
fi
}
resolve_device() {
local major minor dev tagval device=$1
# attempt to resolve devices immediately. if this fails
# and udev is running, fall back on lazy resolution using
# /dev/disk/by-* symlinks. this is flexible enough to support
# usage of tags without udev and "slow" devices like root on
# USB, which might not immediately show up.
case $device in
UUID=*)
tagval=${device#*=}
dev=$(blkid -U "$tagval")
if [ -z "$dev" -a "$udevd_running" -eq 1 ]; then
dev=/dev/disk/by-uuid/$tagval
fi
;;
LABEL=*)
tagval=${device#*=}
dev=$(blkid -L "$tagval")
if [ -z "$dev" -a "$udevd_running" -eq 1 ]; then
dev=/dev/disk/by-label/$tagval
fi
;;
esac
[ -n "$dev" ] && device=$dev
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 "$minor" ]; then
device=$(major_minor_to_device "$major" "$minor" || echo '/dev/root')
if [ ! -b "$device" ]; then
msg "Creating device node with major $major and minor $minor." >&2
mknod "$device" b "$major" "$minor"
fi
echo "$device"
return 0
fi
return 1
}
default_mount_handler() {
if [ ! -b "$root" ]; then
err "Unable to find root device '$root'."
echo "You are being dropped to a recovery shell"
echo " Type 'exit' to try and continue booting"
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
msg ":: mounting '$root' on real root"
if ! mount ${fstype:+-t $fstype} -o ${rwopt:-ro}${rootflags:+,$rootflags} "$root" "$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:
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