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Saul Wold f744edc0b8 systemd: Ensure that we mount devtmpfs

Since systemd also used tmpfs we should make a similar patch for
the systemd-udev script

Fix for bug: https://bugzilla.yoctoproject.org/show_bug.cgi?id=4632
Since udev 172, the 'mknod' logic was removed from udev. Yocto Dylan
is now using udev 182. This means /dev is now required to be a
devtmpfs filesystem (maintained by the kernel).    If the root
filesystem is a ramdisk,  the kernel's auto-mount of /dev doesn't
activate since there is no rootfs to actually mount...  The bug causes
an unusable system as /dev doesn't contain even basic nodes required
to even get a login prompt.

The Yocto  udev/init script mounts tmpfs if it does not detect tmpfs
or devtmpfs mounted at /dev.  This appears to be  outdated logic that
is no longer correct. I believe the Yocto udev init script should be
checking and mounting only 'devtmpfs' on dev.

(From OE-Core rev: d3616f31617830cac9375e8f4aa33e344ac554ed)

Signed-off-by: Alex Olson <alex.olson+yocto@gmail.com>

[YOCTO #4632]

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2013-06-28 09:14:07 +01:00

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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

. /etc/init.d/functions

export TZ=/etc/localtime

[ -d /sys/class ] || exit 1 [ -r /proc/mounts ] || exit 1 [ -x @UDEVD@ ] || exit 1 [ -f /etc/default/udev-cache ] && . /etc/default/udev-cache [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf

readfile () { filename=$1 READDATA="" if [ -r $filename ]; then while read line; do READDATA="$READDATA$line" done < $filename fi }

case "$1" in start) export ACTION=add # propagate /dev from /sys echo "Starting udev"

# 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
mount -a -t tmpfs 2>/dev/null

# cache handling
if [ "$DEVCACHE" != "" ]; then
        readfile /proc/version
        VERSION="$READDATA"
        readfile /proc/cmdline
        CMDLINE="$READDATA"
        readfile /proc/devices
        DEVICES="$READDATA"
        readfile /proc/atags
        ATAGS="$READDATA"

        if [ -e $DEVCACHE ]; then
                readfile /etc/udev/cache.data
                if [ "$READDATA" = "$VERSION$CMDLINE$DEVICES$ATAGS" ]; then
                        (cd /; tar xf $DEVCACHE > /dev/null 2>&1)
                        not_first_boot=1
                        [ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
                        [ -e /dev/shm/udev.cache ] && rm -f /dev/shm/udev.cache
                else
                        echo "$VERSION$CMDLINE$DEVICES$ATAGS" > /dev/shm/udev.cache
                fi
        else
                echo "$VERSION$CMDLINE$DEVICES$ATAGS" > /dev/shm/udev.cache
        fi
fi

# make_extra_nodes
killproc systemd-udevd > "/dev/null" 2>&1

# trigger the sorted events
echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
@UDEVD@ -d

udevadm control --env=STARTUP=1
if [ "$not_first_boot" != "" ];then
        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
        (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 systemd-udevd --quiet ;; restart) $0 stop sleep 1 $0 start ;; status) status systemd-udevd ;; *) echo "Usage: $0 {start|stop|status|restart}" exit 1 esac exit 0

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