Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | |
| 3 | ### BEGIN INIT INFO |
| 4 | # Provides: udev |
| 5 | # Required-Start: mountvirtfs |
| 6 | # Required-Stop: |
| 7 | # Default-Start: S |
| 8 | # Default-Stop: |
| 9 | # Short-Description: Start udevd, populate /dev and load drivers. |
| 10 | ### END INIT INFO |
| 11 | |
| 12 | export TZ=/etc/localtime |
| 13 | |
| 14 | [ -d /sys/class ] || exit 1 |
| 15 | [ -r /proc/mounts ] || exit 1 |
| 16 | [ -x @UDEVD@ ] || exit 1 |
| 17 | SYSCONF_CACHED="/etc/udev/cache.data" |
| 18 | SYSCONF_TMP="/dev/shm/udev.cache" |
| 19 | DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen |
| 20 | |
| 21 | # A list of files which are used as a criteria to judge whether the udev cache could be reused. |
| 22 | CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices" |
| 23 | [ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags" |
| 24 | |
| 25 | # List of files whose metadata (size/mtime/name) will be included in cached |
| 26 | # system state. |
| 27 | META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*" |
| 28 | |
| 29 | # Command to compute system configuration. |
| 30 | sysconf_cmd () { |
| 31 | cat -- $CMP_FILE_LIST |
| 32 | stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}' |
| 33 | } |
| 34 | |
| 35 | [ -f /etc/default/udev-cache ] && . /etc/default/udev-cache |
| 36 | [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf |
| 37 | [ -f /etc/default/rcS ] && . /etc/default/rcS |
| 38 | |
| 39 | kill_udevd () { |
| 40 | pid=`pidof -x udevd` |
| 41 | [ -n "$pid" ] && kill $pid |
| 42 | } |
| 43 | |
| 44 | case "$1" in |
| 45 | start) |
| 46 | export ACTION=add |
| 47 | # propagate /dev from /sys |
| 48 | echo "Starting udev" |
| 49 | |
| 50 | # Check for requireed devtmpfs before trying to start udev and |
| 51 | # mount a no-existant fs. |
| 52 | if ! grep -q devtmpfs /proc/filesystems |
| 53 | then |
| 54 | echo "Missing devtmpfs, which is required for udev to run"; |
| 55 | echo "Halting..." |
| 56 | halt |
| 57 | fi |
| 58 | # mount the devtmpfs on /dev, if not already done |
| 59 | LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && { |
| 60 | mount -n -o mode=0755 -t devtmpfs none "/dev" |
| 61 | } |
| 62 | [ -e /dev/pts ] || mkdir -m 0755 /dev/pts |
| 63 | [ -e /dev/shm ] || mkdir -m 1777 /dev/shm |
| 64 | # the automount rule for udev needs /tmp directory available, as /tmp is a symlink |
| 65 | # to /var/tmp which in turn is a symlink to /var/volatile/tmp, we need to make sure |
| 66 | # /var/volatile/tmp directory to be available. |
| 67 | mkdir -m 1777 -p /var/volatile/tmp |
| 68 | |
| 69 | # Cache handling. |
| 70 | if [ "$DEVCACHE" != "" ]; then |
| 71 | if [ -e $DEVCACHE ]; then |
| 72 | sysconf_cmd > "$SYSCONF_TMP" |
| 73 | if cmp $SYSCONF_CACHED $SYSCONF_TMP >/dev/null; then |
| 74 | tar xmf $DEVCACHE -C / -m |
| 75 | not_first_boot=1 |
| 76 | [ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE" |
| 77 | [ -e $SYSCONF_TMP ] && rm -f "$SYSCONF_TMP" |
| 78 | [ -e "$DEVCACHE_REGEN" ] && rm -f "$DEVCACHE_REGEN" |
| 79 | else |
| 80 | # Output detailed reason why the cached /dev is not used |
| 81 | cat <<EOF |
| 82 | udev: Not using udev cache because of changes detected in the following files: |
| 83 | udev: $CMP_FILE_LIST |
| 84 | udev: $META_FILE_LIST |
| 85 | udev: The udev cache will be regenerated. To identify the detected changes, |
| 86 | udev: compare the cached sysconf at $SYSCONF_CACHED |
| 87 | udev: against the current sysconf at $SYSCONF_TMP |
| 88 | EOF |
| 89 | touch "$DEVCACHE_REGEN" |
| 90 | fi |
| 91 | else |
| 92 | if [ "$ROOTFS_READ_ONLY" != "yes" ]; then |
| 93 | # If rootfs is not read-only, it's possible that a new udev cache would be generated; |
| 94 | # otherwise, we do not bother to read files. |
| 95 | touch "$DEVCACHE_REGEN" |
| 96 | fi |
| 97 | fi |
| 98 | fi |
| 99 | |
| 100 | # make_extra_nodes |
| 101 | kill_udevd > "/dev/null" 2>&1 |
| 102 | |
| 103 | # trigger the sorted events |
| 104 | [ -e /proc/sys/kernel/hotplug ] && echo -e '\000' >/proc/sys/kernel/hotplug |
| 105 | @UDEVD@ -d |
| 106 | |
| 107 | udevadm control --env=STARTUP=1 |
| 108 | if [ "$not_first_boot" != "" ];then |
| 109 | if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then |
| 110 | PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform" |
| 111 | else |
| 112 | PLATFORM_BUS_NOMATCH="" |
| 113 | fi |
| 114 | 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 |
| 115 | (udevadm settle --timeout=3; udevadm control --env=STARTUP=)& |
| 116 | else |
| 117 | udevadm trigger --action=add |
| 118 | udevadm settle |
| 119 | fi |
| 120 | ;; |
| 121 | stop) |
| 122 | echo "Stopping udevd" |
| 123 | start-stop-daemon --stop --name udevd --quiet |
| 124 | ;; |
| 125 | restart) |
| 126 | $0 stop |
| 127 | sleep 1 |
| 128 | $0 start |
| 129 | ;; |
| 130 | status) |
| 131 | pid=`pidof -x udevd` |
| 132 | if [ -n "$pid" ]; then |
| 133 | echo "udevd (pid $pid) is running ..." |
| 134 | else |
| 135 | echo "udevd is stopped" |
| 136 | fi |
| 137 | ;; |
| 138 | *) |
| 139 | echo "Usage: $0 {start|stop|status|restart}" |
| 140 | exit 1 |
| 141 | esac |
| 142 | exit 0 |