diff options
Diffstat (limited to 'packages/udev/files/init')
| -rwxr-xr-x | packages/udev/files/init | 234 |
1 files changed, 126 insertions, 108 deletions
diff --git a/packages/udev/files/init b/packages/udev/files/init index 16efb31542..c290661c72 100755 --- a/packages/udev/files/init +++ b/packages/udev/files/init @@ -1,36 +1,18 @@ #!/bin/sh -e -PATH="/usr/sbin:/usr/bin:/sbin:/bin" - UDEVSTART=/sbin/udevstart -# default maximum size of the /dev ramfs -ramfs_size="1M" +# defaults +tmpfs_size="10M" +udev_root="/dev" [ -x $UDEVSTART ] || exit 0 . /etc/udev/udev.conf -case "$(uname -r)" in - 2.[012345].*) - echo "udev requires a kernel >= 2.6, not started." - exit 0 - ;; -esac - -if ! grep -q '[[:space:]]ramfs$' /proc/filesystems; then - echo "udev requires ramfs support, not started." - exit 0 -fi - -if [ ! -e /proc/sys/kernel/hotplug ]; then - echo "udev requires hotplug support, not started." - exit 0 -fi - ############################################################################## -# we need to unmount /dev/pts/ and remount it later over the ramfs +# we need to unmount /dev/pts/ and remount it later over the tmpfs unmount_devpts() { if mountpoint -q /dev/pts/; then umount -l /dev/pts/ @@ -41,132 +23,169 @@ unmount_devpts() { fi } -# mount a ramfs over /dev, if somebody did not already do it -mount_ramfs() { - if grep -E -q "^[^[:space:]]+ /dev ramfs" /proc/mounts; then +# mount a tmpfs over /dev, if somebody did not already do it +mount_tmpfs() { + if grep -E -q "^[^[:space:]]+ /dev tmpfs" /proc/mounts; then return 0 fi - # /.dev is used by /sbin/MAKEDEV to access the real /dev directory. - # if you don't like this, remove /.dev/. - [ -d /.dev ] && mount --bind /dev /.dev + # /dev/.static/dev/ is used by MAKEDEV to access the real /dev/ directory. + # /etc/udev/ is recycled as a temporary mount point because it's the only + # directory which is guaranteed to be available. + mount -n -o bind /dev /etc/udev + + if ! mount -n -o size=$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 - echo -n "Mounting a ramfs over /dev..." - mount -n -o size=$ramfs_size,mode=0755 -t ramfs none /dev - echo "done." + mkdir -p /dev/.static/dev + chmod 700 /dev/.static/ + mount -n -o move /etc/udev /dev/.static/dev } # I hate this hack. -- Md make_extra_nodes() { - if [ -f /etc/udev/links.conf ]; then + [ -e /etc/udev/links.conf ] || return 0 grep '^[^#]' /etc/udev/links.conf | \ while read type name arg1; do [ "$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 $arg1 - ;; - *) - echo "unparseable line ($type $name $arg1)" - ;; + 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 $arg1)" ;; esac done - fi +} + +# this function is duplicated in preinst, postinst and d-i +supported_kernel() { + case "$(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 $*\n\n" + printf "has been run from an interactive shell.\n" + printf "It will probably not do what you expect, so this script will wait\n" + printf "60 seconds before continuing. Press ^C to stop it.\n" + printf "RUNNING THIS COMMAND IS HIGHLY DISCOURAGED!\n\n\n\n" + sleep 60 } ############################################################################## -if [ "$udev_root" != "/dev" ]; then - echo "WARNING: udev_root != /dev" +if ! supported_kernel; then + echo "udev requires a kernel >= 2.6.12, not started." + exit 1 +fi -case "$1" in - start) - if [ -e "$udev_root/.udev.tdb" ]; then - if mountpoint -q /dev/; then - echo "FATAL: udev is already active on $udev_root." - exit 1 - else - echo "WARNING: .udev.tdb already exists on the old $udev_root!" - fi - fi - mount -n -o size=$ramfs_size,mode=0755 -t ramfs none $udev_root - echo -n "Creating initial device nodes..." - $UDEVSTART - echo "done." - ;; - stop) - start-stop-daemon -K -x /sbin/udevd - echo -n "Unmounting $udev_root..." - # unmounting with -l should never fail - if umount -l $udev_root; then - echo "done." - else - echo "failed." - fi - ;; - restart|force-reload) - $0 stop - $0 start - ;; - *) - echo "Usage: /etc/init.d/udev {start|stop|restart|force-reload}" - exit 1 - ;; -esac +if [ ! -e /proc/filesystems ]; then + echo "udev requires a mounted procfs, not started." + exit 1 +fi + +if ! grep -q '[[:space:]]tmpfs$' /proc/filesystems; then + echo "udev requires tmpfs support, not started." + exit 1 +fi - exit 0 -fi # udev_root != /dev/ +if [ ! -d /sys/class/ ]; then + echo "udev requires a mounted sysfs, not started." + exit 1 +fi + +if [ ! -e /proc/sys/kernel/hotplug ]; 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/.udev.tdb" ]; then + if [ -e "$udev_root/.udevdb" ]; then if mountpoint -q /dev/; then - echo "FATAL: udev is already active on $udev_root." - exit 1 + TMPFS_MOUNTED=1 else - echo "WARNING: .udev.tdb already exists on the old $udev_root!" + echo ".udevdb already exists on the old $udev_root!" fi fi - unmount_devpts - mount_ramfs - ACTION=add - echo -n "Creating initial device nodes..." - $UDEVSTART + warn_if_interactive + + #echo /sbin/udevsend > /proc/sys/kernel/hotplug + echo "" > /proc/sys/kernel/hotplug + udevsend + if [ "$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 - echo "done." -# /etc/init.d/mountvirtfs start ;; stop) - start-stop-daemon -K -x /sbin/udevd + warn_if_interactive + start-stop-daemon --stop --exec /sbin/udevd --quiet unmount_devpts - echo -n "Unmounting /dev..." + 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 - echo "done." - umount -l /.dev || true -# /etc/init.d/mountvirtfs start - else - echo "failed." + if ! umount -l /dev; then + exit 1 fi ;; restart|force-reload) - start-stop-daemon -K -x /sbin/udevd - echo -n "Recreating device nodes..." - ACTION=add - $UDEVSTART + start-stop-daemon --stop --exec /sbin/udevd --quiet + log_begin_msg "Recreating device nodes..." + udevstart make_extra_nodes - echo "done." + log_end_msg 0 ;; *) echo "Usage: /etc/init.d/udev {start|stop|restart|force-reload}" @@ -175,4 +194,3 @@ case "$1" in esac exit 0 - |