132 lines
4.0 KiB
Bash
132 lines
4.0 KiB
Bash
#!/bin/sh
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### BEGIN INIT INFO
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# Provides: udev
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# Required-Start: mountvirtfs
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# Required-Stop:
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# Default-Start: S
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# Default-Stop:
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# Short-Description: Start udevd, populate /dev and load drivers.
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### END INIT INFO
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export TZ=/etc/localtime
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[ -d /sys/class ] || exit 1
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[ -r /proc/mounts ] || exit 1
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[ -x @UDEVD@ ] || exit 1
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[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
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[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
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[ -f /etc/default/rcS ] && . /etc/default/rcS
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readfiles () {
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READDATA=""
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for filename in $@; do
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if [ -r $filename ]; then
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while read line; do
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READDATA="$READDATA$line"
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done < $filename
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fi
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done
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}
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kill_udevd () {
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pid=`pidof -x udevd`
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[ -n "$pid" ] && kill $pid
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}
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case "$1" in
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start)
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export ACTION=add
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# propagate /dev from /sys
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echo "Starting udev"
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# Check for requireed devtmpfs before trying to start udev and
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# mount a no-existant fs.
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if ! grep -q devtmpfs /proc/filesystems
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then
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echo "Missing devtmpfs, which is required for udev to run";
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echo "Halting..."
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halt
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fi
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# mount the devtmpfs on /dev, if not already done
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LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
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mount -n -o mode=0755 -t devtmpfs none "/dev"
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}
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[ -e /dev/pts ] || mkdir -m 0755 /dev/pts
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[ -e /dev/shm ] || mkdir -m 1777 /dev/shm
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mount -a -t tmpfs 2>/dev/null
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mkdir -p /var/volatile/tmp
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# Cache handling.
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# A list of files which are used as a criteria to judge whether the udev cache could be reused.
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CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices /proc/atags"
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if [ "$DEVCACHE" != "" ]; then
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if [ -e $DEVCACHE ]; then
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readfiles $CMP_FILE_LIST
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NEWDATA="$READDATA"
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readfiles /etc/udev/cache.data
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OLDDATA="$READDATA"
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if [ "$OLDDATA" = "$NEWDATA" ]; then
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(cd /; tar xf $DEVCACHE > /dev/null 2>&1)
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not_first_boot=1
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[ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
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[ -e /dev/shm/udev.cache ] && rm -f /dev/shm/udev.cache
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else
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# Output detailed reason why the cached /dev is not used
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if [ "$VERBOSE" != "no" ]; then
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echo "udev: udev cache not used"
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echo "udev: we use $CMP_FILE_LIST as criteria to judge whether the cache /dev could be resued"
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echo "udev: olddata: $OLDDATA"
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echo "udev: newdata: $NEWDATA"
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fi
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echo "$NEWDATA" > /dev/shm/udev.cache
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fi
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else
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if [ "$ROOTFS_READ_ONLY" != "yes" ]; then
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# If rootfs is not read-only, it's possible that a new udev cache would be generated;
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# otherwise, we do not bother to read files.
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readfiles $CMP_FILE_LIST
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echo "$READDATA" > /dev/shm/udev.cache
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fi
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fi
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fi
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# make_extra_nodes
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kill_udevd > "/dev/null" 2>&1
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# trigger the sorted events
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echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
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@UDEVD@ -d
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udevadm control --env=STARTUP=1
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if [ "$not_first_boot" != "" ];then
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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 --subsystem-nomatch=platform
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(udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
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else
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udevadm trigger --action=add
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udevadm settle
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fi
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;;
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stop)
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echo "Stopping udevd"
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start-stop-daemon --stop --name udevd --quiet
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;;
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restart)
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$0 stop
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sleep 1
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$0 start
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;;
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status)
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pid=`pidof -x udevd`
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if [ -n "$pid" ]; then
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echo "udevd (pid $pid) is running ..."
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else
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echo "udevd is stopped"
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fi
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;;
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*)
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echo "Usage: $0 {start|stop|status|restart}"
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exit 1
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esac
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exit 0
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