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|
# rc.lib -- common functions for rc.boot and rc.shutdown
# shellcheck disable=1090,2034
export PATH=$PATH:/usr/local/bin:/usr/bin
# logger is provided by 3 packages on the core repository (sbase,
# busybox, util-linux). However, it is optional. Since logger
# outputs to stderr, we cannot silence stderr to not display error
# messages in the rare case where it isn't available on the system.
logger=$(command -v logger) || logger=:
log() {
# A function to log all output to syslog (if it is available)
# and to kernel messages. This way the logs are readable after
# reboot.
#
# The usability of this also depends on how early you start
# syslogd and how late you stop it. I will be modifying this
# to enable a way (or multiple ways) of storing boot/shutdown
# logs in a persistent manner.
#
# Right now, you could possibly start a syslogd from the early
# boot hooks which will be run right after filesystems are
# mounted.
#
# If no arguments for the logger are specified, it will read
# standard input for the log. This means you can pipe the output
# of a command to this function. Those will be logged as well.
[ "$1" ] && printf 'init: %s\n' "$@" >/dev/kmsg 2>/dev/null
"$logger" -t init "${@:--s}"
}
out() {
printf '%b%s \033[39m%s\033[m\n' "${3:-"\033[1;36m"}" "${2:-->}" "$1"
log "$1"
}
err() { out "$1" "!>" "\033[1;31m" ;}
device_helper() {
# We devices based on user preference, and what's available
# on the system.
#
# Get the device daemon to be used, if we don't have a daemon
# available on the system, do not continue any further.
[ "$devd" ] || {
devd=$(command -v udevd) || devd=$(command -v mdev) ||
return 0
}
case "$1" in
settle) case "${devd##*/}" in
udevd)
udevd -d
udevadm trigger -c add -t subsystems
udevadm trigger -c add -t devices
udevadm settle
;;
mdev)
mdev -s
mdev -df & mdev_pid=$!
;;
esac
;;
exit) case "${devd##*/}" in
udevd)
udevadm control --exit
;;
mdev)
[ "$mdev_pid" ] && kill "$mdev_pid"
command -v mdev > /proc/sys/kernel/hotplug
;;
esac
esac
}
link() {
ln -sf "$1" "$2"
printf '%s ==> %s\n' "$2" "$1"
}
mounted() {
[ -e "$1" ] &&
[ -f /proc/mounts ] &&
while read -r _ mnt _; do
case "$mnt" in "$1") return 0; esac
done < /proc/mounts
return 1
}
mnt() {
mounted "$4" && set -- "remount,$1" "$2" "$3" "$4"
mount -o "$1" -t "$2" "$3" "$4"
}
parse_cmdline() {
# This is a primitive way of parsing kernel command line
# options. Before now, carbs-init ignored these options
# set by the user. More will be added as needed. Init scripts
# don't need to handle most of the command line options
# as the kernel deals with most of them, but not things
# such as mount options.
[ -r /proc/cmdline ] || {
err "Kernel command line options cannot be parsed"
shell
}
# We want to read words instead of lines here.
# shellcheck disable=2013
for arg in $(cat /proc/cmdline); do
case "$arg" in
ro) RO=1 ;;
forcefsck) FORCEFSCK="-f" ;;
fastboot) FASTBOOT=1 ;;
loglevel=?) dmesg_level=${arg#loglevel=} ;;
devd=*) devd=${arg#devd=} ;;
esac
done
}
random() {
seed=/var/random.seed
case "$1" in
load)
out "Seeding random..."
[ -f "$seed" ] || {
out "Generating entropy, this might take a while..."
dd count=1 bs=512 if=/dev/random of="$seed" 2>/dev/null
}
cat "$seed" > /dev/urandom
;;
save)
mkdir -p "${seed%/*}"
out "Saving random seed..."
dd count=1 bs=512 if=/dev/urandom of="$seed" 2>/dev/null
;;
esac
}
run_hook() {
out "Running '$1' hooks..."
for hook in "/etc/init/"*".$1" "/usr/lib/init/hooks/"*".$1"; do
[ -f "$hook" ] || continue
out "Running '$hook'..."
. "$hook"
done
}
shell() {
err "Dropping to shell, type 'exit' to continue the boot process."
sh -l
}
|
