143 lines
4.7 KiB
Bash
143 lines
4.7 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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SYSCONF_CACHED="/etc/udev/cache.data"
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SYSCONF_TMP="/dev/shm/udev.cache"
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DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen
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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"
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[ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags"
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# List of files whose metadata (size/mtime/name) will be included in cached
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# system state.
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META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*"
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# Command to compute system configuration.
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sysconf_cmd () {
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cat -- $CMP_FILE_LIST
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stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}'
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}
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[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
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[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
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[ -f /etc/default/rcS ] && . /etc/default/rcS
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kill_udevd () {
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pid=`pidof -x udevd`
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[ -n "$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" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
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mount -n -o mode=0755 -t devtmpfs none "/dev"
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}
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[ -e /dev/pts ] || mkdir -m 0755 /dev/pts
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[ -e /dev/shm ] || mkdir -m 1777 /dev/shm
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# the automount rule for udev needs /tmp directory available, as /tmp is a symlink
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# to /var/tmp which in turn is a symlink to /var/volatile/tmp, we need to make sure
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# /var/volatile/tmp directory to be available.
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mkdir -m 1777 -p /var/volatile/tmp
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# Cache handling.
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if [ "$DEVCACHE" != "" ]; then
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if [ -e $DEVCACHE ]; then
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sysconf_cmd > "$SYSCONF_TMP"
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if cmp $SYSCONF_CACHED $SYSCONF_TMP >/dev/null; then
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tar xmf $DEVCACHE -C / -m
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not_first_boot=1
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[ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
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[ -e $SYSCONF_TMP ] && rm -f "$SYSCONF_TMP"
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[ -e "$DEVCACHE_REGEN" ] && rm -f "$DEVCACHE_REGEN"
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else
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# Output detailed reason why the cached /dev is not used
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cat <<EOF
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udev: Not using udev cache because of changes detected in the following files:
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udev: $CMP_FILE_LIST
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udev: $META_FILE_LIST
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udev: The udev cache will be regenerated. To identify the detected changes,
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udev: compare the cached sysconf at $SYSCONF_CACHED
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udev: against the current sysconf at $SYSCONF_TMP
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EOF
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touch "$DEVCACHE_REGEN"
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fi
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else
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if [ "$ROOTFS_READ_ONLY" != "yes" ]; then
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# If rootfs is not read-only, it's possible that a new udev cache would be generated;
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# otherwise, we do not bother to read files.
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touch "$DEVCACHE_REGEN"
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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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[ -e /proc/sys/kernel/hotplug ] && echo -e '\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 [ "$not_first_boot" != "" ];then
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if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then
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PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform"
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else
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PLATFORM_BUS_NOMATCH=""
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fi
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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 $PLATFORM_BUS_NOMATCH
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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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