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|
#!/bin/sh
### BEGIN INIT INFO
# Provides: udev
# Required-Start: mountvirtfs
# Required-Stop:
# Default-Start: S
# Default-Stop:
# Short-Description: Start udevd, populate /dev and load drivers.
### END INIT INFO
export TZ=/etc/localtime
[ -d /sys/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x @UDEVD@ ] || exit 1
SYSCONF_CACHED="/etc/udev/cache.data"
SYSCONF_TMP="/dev/shm/udev.cache"
DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen
# A list of files which are used as a criteria to judge whether the udev cache could be reused.
CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices"
[ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags"
# List of files whose metadata (size/mtime/name) will be included in cached
# system state.
META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*"
# Command to compute system configuration.
sysconf_cmd () {
cat -- $CMP_FILE_LIST
stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}'
}
[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
[ -f /etc/default/rcS ] && . /etc/default/rcS
kill_udevd () {
pid=`pidof -x udevd`
[ -n "$pid" ] && kill $pid
}
case "$1" in
start)
export ACTION=add
# propagate /dev from /sys
echo "Starting udev"
# Check for requireed devtmpfs before trying to start udev and
# mount a no-existant fs.
if ! grep -q devtmpfs /proc/filesystems
then
echo "Missing devtmpfs, which is required for udev to run";
echo "Halting..."
halt
fi
# mount the devtmpfs on /dev, if not already done
LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
mount -n -o mode=0755 -t devtmpfs none "/dev"
}
[ -e /dev/pts ] || mkdir -m 0755 /dev/pts
[ -e /dev/shm ] || mkdir -m 1777 /dev/shm
# the automount rule for udev needs /tmp directory available, as /tmp is a symlink
# to /var/tmp which in turn is a symlink to /var/volatile/tmp, we need to make sure
# /var/volatile/tmp directory to be available.
mkdir -m 1777 -p /var/volatile/tmp
# Cache handling.
if [ "$DEVCACHE" != "" ]; then
if [ -e $DEVCACHE ]; then
sysconf_cmd > "$SYSCONF_TMP"
if cmp $SYSCONF_CACHED $SYSCONF_TMP >/dev/null; then
tar xmf $DEVCACHE -C / -m
not_first_boot=1
[ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
[ -e $SYSCONF_TMP ] && rm -f "$SYSCONF_TMP"
[ -e "$DEVCACHE_REGEN" ] && rm -f "$DEVCACHE_REGEN"
else
# Output detailed reason why the cached /dev is not used
cat <<EOF
udev: Not using udev cache because of changes detected in the following files:
udev: $CMP_FILE_LIST
udev: $META_FILE_LIST
udev: The udev cache will be regenerated. To identify the detected changes,
udev: compare the cached sysconf at $SYSCONF_CACHED
udev: against the current sysconf at $SYSCONF_TMP
EOF
touch "$DEVCACHE_REGEN"
fi
else
if [ "$ROOTFS_READ_ONLY" != "yes" ]; then
# If rootfs is not read-only, it's possible that a new udev cache would be generated;
# otherwise, we do not bother to read files.
touch "$DEVCACHE_REGEN"
fi
fi
fi
# make_extra_nodes
kill_udevd > "/dev/null" 2>&1
# trigger the sorted events
[ -e /proc/sys/kernel/hotplug ] && echo -e '\000' >/proc/sys/kernel/hotplug
@UDEVD@ -d
udevadm control --env=STARTUP=1
if [ "$not_first_boot" != "" ];then
if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then
PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform"
else
PLATFORM_BUS_NOMATCH=""
fi
udevadm trigger --action=add --subsystem-nomatch=tty --subsystem-nomatch=mem --subsystem-nomatch=vc --subsystem-nomatch=vtconsole --subsystem-nomatch=misc --subsystem-nomatch=dcon --subsystem-nomatch=pci_bus --subsystem-nomatch=graphics --subsystem-nomatch=backlight --subsystem-nomatch=video4linux $PLATFORM_BUS_NOMATCH
(udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
else
udevadm trigger --action=add
udevadm settle
fi
;;
stop)
echo "Stopping udevd"
start-stop-daemon --stop --name udevd --quiet
;;
restart)
$0 stop
sleep 1
$0 start
;;
status)
pid=`pidof -x udevd`
if [ -n "$pid" ]; then
echo "udevd (pid $pid) is running ..."
else
echo "udevd is stopped"
fi
;;
*)
echo "Usage: $0 {start|stop|status|restart}"
exit 1
esac
exit 0
|
