diff options
Diffstat (limited to 'recipes/udev/files/init')
| -rwxr-xr-x | recipes/udev/files/init | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/recipes/udev/files/init b/recipes/udev/files/init new file mode 100755 index 0000000000..a13b9afcd5 --- /dev/null +++ b/recipes/udev/files/init @@ -0,0 +1,212 @@ +#!/bin/sh + +UDEVSTART=/sbin/udevstart + +# defaults +tmpfs_size="2M" +udev_root="/dev" + +[ -x $UDEVSTART ] || exit 0 + +. /etc/udev/udev.conf + +############################################################################## + +# we need to unmount /dev/pts/ and remount it later over the tmpfs +unmount_devpts() { + if mountpoint -q /dev/pts/; then + umount -l /dev/pts/ + fi + + if mountpoint -q /dev/shm/; then + umount -l /dev/shm/ + fi +} + +# mount a tmpfs over /dev, if somebody did not already do it +mount_tmpfs() { + if grep -E -q "^[^[:space:]]+ /dev tmpfs" /proc/mounts; then + return 0 + fi + + # /dev/.static/dev/ is used by MAKEDEV to access the real /dev/ directory. + # /etc/udev/ is recycled as a temporary mount point because it's the only + # directory which is guaranteed to be available. + mount -n -o bind /dev /etc/udev + + if ! mount -n -o size=$tmpfs_size,mode=0755 -t tmpfs tmpfs /dev; then + umount /etc/udev + echo "udev requires tmpfs support, not started." + exit 1 + fi + + # using ln to test if /dev works, because touch is in /usr/bin/ + if ln -s test /dev/test-file; then + rm /dev/test-file + else + echo "udev requires tmpfs support, not started." + umount /etc/udev + umount /dev + exit 1 + fi + + mkdir -p /dev/.static/dev + chmod 700 /dev/.static/ + # The mount options in busybox are non-standard... + if test -x /bin/mount.util-linux + then + /bin/mount.util-linux --move /etc/udev /dev/.static/dev + elif test -x /bin/busybox + then + busybox mount -n -o move /etc/udev /dev/.static/dev + else + echo "udev requires an identifiable mount command, not started." + umount /etc/udev + umount /dev + exit 1 + fi +} + +# I hate this hack. -- Md +make_extra_nodes() { + [ -e /etc/udev/links.conf ] || return 0 + grep '^[^#]' /etc/udev/links.conf | \ + while read type name arg1; do + [ "$type" -a "$name" -a ! -e "/dev/$name" -a ! -L "/dev/$name" ] ||continue + case "$type" in + L) ln -s $arg1 /dev/$name ;; + D) mkdir -p /dev/$name ;; + M) mknod -m 600 /dev/$name $arg1 ;; + *) echo "links.conf: unparseable line ($type $name $arg1)" ;; + esac + done +} + +# this function is duplicated in preinst, postinst and d-i +supported_kernel() { + case "$(uname -r)" in + 2.[012345].*|2.6.[0-9]|2.6.[0-9][!0-9]*) return 1 ;; + 2.6.1[01]|2.6.1[01][!0-9]*) return 1 ;; + esac + return 0 +} + +# shell version of /usr/bin/tty +my_tty() { + [ -x /bin/readlink ] || return 0 + [ -e /proc/self/fd/0 ] || return 0 + readlink --silent /proc/self/fd/0 || true +} + +warn_if_interactive() { + if [ "$RUNLEVEL" = "S" -a "$PREVLEVEL" = "N" ]; then + return 0 + fi + + TTY=$(my_tty) + if [ -z "$TTY" -o "$TTY" = "/dev/console" ]; then + return 0 + fi + + printf "\n\n\nIt has been detected that the command\n\n\t$0 $*\n\n" + printf "has been run from an interactive shell.\n" + printf "It will probably not do what you expect, so this script will wait\n" + printf "60 seconds before continuing. Press ^C to stop it.\n" + printf "RUNNING THIS COMMAND IS HIGHLY DISCOURAGED!\n\n\n\n" + sleep 60 +} + +############################################################################## + +if ! supported_kernel; then + echo "udev requires a kernel >= 2.6.12, not started." + exit 1 +fi + +if [ ! -e /proc/filesystems ]; then + echo "udev requires a mounted procfs, not started." + exit 1 +fi + +if ! grep -q '[[:space:]]tmpfs$' /proc/filesystems; then + echo "udev requires tmpfs support, not started." + exit 1 +fi + +if [ ! -d /sys/class/ ]; then + echo "udev requires a mounted sysfs, not started." + exit 1 +fi + +if [ ! -e /proc/sys/kernel/hotplug ] && [ ! -e /sys/kernel/uevent_helper ]; then + echo "udev requires hotplug support, not started." + exit 1 +fi + +############################################################################## + +# When modifying this script, do not forget that between the time that +# the new /dev has been mounted and udevstart has been run there will be +# no /dev/null. This also means that you cannot use the "&" shell command. + +case "$1" in + start) + if [ -e "$udev_root/.udevdb" ]; then + if mountpoint -q /dev/; then + TMPFS_MOUNTED=1 + else + echo ".udevdb already exists on the old $udev_root!" + fi + fi + warn_if_interactive + + #echo /sbin/udevsend > /proc/sys/kernel/hotplug + if [ -e /sys/kernel/uevent_helper ] ; then + echo "" > /sys/kernel/uevent_helper + else + echo "" > /proc/sys/kernel/hotplug + fi + udevsend + if [ "$UDEV_DISABLED" = "yes" ]; then + echo "udev disabled on the kernel command line, not started." + exit 0 + fi + + if [ ! "$TMPFS_MOUNTED" ]; then + unmount_devpts + mount_tmpfs + [ -d /proc/1 ] || mount -n /proc + # if this directory is not present /dev will not be updated by udev + mkdir /dev/.udevdb/ + echo "Creating initial device nodes..." + udevstart + fi + make_extra_nodes + ;; + stop) + warn_if_interactive + start-stop-daemon --stop --exec /sbin/udevd --quiet + unmount_devpts + if [ -d /dev/.static/dev/ ]; then + umount -l /dev/.static/dev/ || true + fi + echo "Unmounting /dev..." + # unmounting with -l should never fail + if ! umount -l /dev; then + exit 1 + fi + ;; + restart|force-reload) + start-stop-daemon --stop --exec /sbin/udevd --quiet + log_begin_msg "Recreating device nodes..." + udevstart + make_extra_nodes + log_end_msg 0 + ;; + *) + echo "Usage: /etc/init.d/udev {start|stop|restart|force-reload}" + exit 1 + ;; +esac + +exit 0 |