diff options
Diffstat (limited to 'meta/recipes-core/udev/eudev/init')
| -rw-r--r-- | meta/recipes-core/udev/eudev/init | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/meta/recipes-core/udev/eudev/init b/meta/recipes-core/udev/eudev/init new file mode 100644 index 0000000000..0ab028b391 --- /dev/null +++ b/meta/recipes-core/udev/eudev/init @@ -0,0 +1,142 @@ +#!/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 |