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-rw-r--r--meta/recipes-core/udev/udev/init140
1 files changed, 140 insertions, 0 deletions
diff --git a/meta/recipes-core/udev/udev/init b/meta/recipes-core/udev/udev/init
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index 0000000000..d26cbfca96
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@@ -0,0 +1,140 @@
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
12export TZ=/etc/localtime
13
14[ -d /sys/class ] || exit 1
15[ -r /proc/mounts ] || exit 1
16[ -x @UDEVD@ ] || exit 1
17SYSCONF_CACHED="/etc/udev/cache.data"
18SYSCONF_TMP="/dev/shm/udev.cache"
19[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
20[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
21[ -f /etc/default/rcS ] && . /etc/default/rcS
22
23readfiles () {
24 READDATA=""
25 for filename in $@; do
26 if [ -r $filename ]; then
27 while read line; do
28 READDATA="$READDATA$line"
29 done < $filename
30 fi
31 done
32}
33
34kill_udevd () {
35 pid=`pidof -x udevd`
36 [ -n "$pid" ] && kill $pid
37}
38
39case "$1" in
40 start)
41 export ACTION=add
42 # propagate /dev from /sys
43 echo "Starting udev"
44
45 # Check for requireed devtmpfs before trying to start udev and
46 # mount a no-existant fs.
47 if ! grep -q devtmpfs /proc/filesystems
48 then
49 echo "Missing devtmpfs, which is required for udev to run";
50 echo "Halting..."
51 halt
52 fi
53 # mount the devtmpfs on /dev, if not already done
54 LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
55 mount -n -o mode=0755 -t devtmpfs none "/dev"
56 }
57 [ -e /dev/pts ] || mkdir -m 0755 /dev/pts
58 [ -e /dev/shm ] || mkdir -m 1777 /dev/shm
59 # the automount rule for udev needs /tmp directory available, as /tmp is a symlink
60 # to /var/tmp which in turn is a symlink to /var/volatile/tmp, we need to make sure
61 # /var/volatile/tmp directory to be available.
62 mkdir -m 1777 -p /var/volatile/tmp
63
64 # Cache handling.
65 # A list of files which are used as a criteria to judge whether the udev cache could be reused.
66 CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices /proc/atags"
67 if [ "$DEVCACHE" != "" ]; then
68 if [ -e $DEVCACHE ]; then
69 readfiles $CMP_FILE_LIST
70 NEWDATA="$READDATA"
71 readfiles "$SYSCONF_CACHED"
72 OLDDATA="$READDATA"
73 if [ "$OLDDATA" = "$NEWDATA" ]; 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 else
79 # Output detailed reason why the cached /dev is not used
80 if [ "$VERBOSE" != "no" ]; then
81 echo "udev: udev cache not used"
82 echo "udev: we use $CMP_FILE_LIST as criteria to judge whether the cache /dev could be resued"
83 echo "udev: olddata: $OLDDATA"
84 echo "udev: newdata: $NEWDATA"
85 fi
86 echo "$NEWDATA" > "$SYSCONF_TMP"
87 fi
88 else
89 if [ "$ROOTFS_READ_ONLY" != "yes" ]; then
90 # If rootfs is not read-only, it's possible that a new udev cache would be generated;
91 # otherwise, we do not bother to read files.
92 readfiles $CMP_FILE_LIST
93 echo "$READDATA" > "$SYSCONF_TMP"
94 fi
95 fi
96 fi
97
98 # make_extra_nodes
99 kill_udevd > "/dev/null" 2>&1
100
101 # trigger the sorted events
102 [ -e /proc/sys/kernel/hotplug ] && echo -e '\000' >/proc/sys/kernel/hotplug
103 @UDEVD@ -d
104
105 udevadm control --env=STARTUP=1
106 if [ "$not_first_boot" != "" ];then
107 if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then
108 PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform"
109 else
110 PLATFORM_BUS_NOMATCH=""
111 fi
112 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
113 (udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
114 else
115 udevadm trigger --action=add
116 udevadm settle
117 fi
118 ;;
119 stop)
120 echo "Stopping udevd"
121 start-stop-daemon --stop --name udevd --quiet
122 ;;
123 restart)
124 $0 stop
125 sleep 1
126 $0 start
127 ;;
128 status)
129 pid=`pidof -x udevd`
130 if [ -n "$pid" ]; then
131 echo "udevd (pid $pid) is running ..."
132 else
133 echo "udevd is stopped"
134 fi
135 ;;
136 *)
137 echo "Usage: $0 {start|stop|status|restart}"
138 exit 1
139esac
140exit 0