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1 | #!/bin/sh | |
2 | # | |
3 | # start_udev | |
4 | # | |
5 | # script to initialize /dev by using udev. | |
6 | # | |
7 | # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> | |
8 | # | |
9 | # Released under the GPL v2 only. | |
10 | # | |
11 | # This needs to be run at the earliest possible point in the boot | |
12 | # process. | |
13 | # | |
14 | # Based on the udev init.d script | |
15 | # | |
16 | # Thanks go out to the Gentoo developers for proving | |
17 | # that this is possible to do. | |
18 | # | |
19 | # Yes, it's very verbose, feel free to turn off all of the echo calls, | |
20 | # they were there to make me feel better that everything was working | |
21 | # properly during development... | |
22 | ||
23 | # default value, if no config present. | |
24 | udev_root="/dev" | |
25 | sysfs_dir="/sys" | |
26 | udevd_timeout=8 | |
27 | ||
28 | # don't use udev if sysfs is not mounted. | |
29 | [ -d $sysfs_dir/class ] || exit 1 | |
30 | [ -r /proc/mounts ] || exit 1 | |
31 | [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf | |
32 | ||
33 | . /etc/rc.d/init.d/functions | |
34 | ||
35 | prog=udev | |
36 | bin=/sbin/udev | |
37 | udevd=/lib/udev/udevd | |
38 | # trim traling slash, code expects it not to be there | |
39 | udev_root=${udev_root%/} | |
40 | ||
41 | create_static_nodes() { | |
42 | /sbin/kmod static-nodes --format=tmpfiles | \ | |
43 | while read type file mode uid gid age dev ; do | |
44 | case $type in | |
45 | d|D) | |
46 | mkdir -p --mode=$mode $file | |
47 | ;; | |
48 | *) | |
49 | oldIFS=$IFS | |
50 | IFS=":" | |
51 | set -- $dev | |
52 | maj=$1 | |
53 | min=$2 | |
54 | IFS=$oldIFS | |
55 | mknod --mode=$mode $file $type $maj $min | |
56 | ;; | |
57 | esac | |
58 | [ $uid = "-" ] || chown $uid $file | |
59 | [ $gid = "-" ] || chgrp $gid $file | |
60 | done | |
61 | } | |
62 | ||
63 | make_extra_nodes() { | |
64 | grep '^[^#]' /etc/udev/links.conf | \ | |
65 | while read type name arg1; do | |
66 | [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue | |
67 | case "$type" in | |
68 | L) ln -s $arg1 $udev_root/$name ;; | |
69 | D) mkdir -p $udev_root/$name ;; | |
70 | M) mknod -m 600 /dev/$name $arg1 ;; | |
71 | *) echo "links.conf: unparseable line ($type $name $arg1)" ;; | |
72 | esac | |
73 | done | |
74 | [ -d /lib/udev/devices ] && cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || : | |
75 | [ -d /lib64/udev/devices ] && cp -a /lib64/udev/devices/* /dev/ >/dev/null 2>&1 || : | |
76 | } | |
77 | ||
78 | kill_udevd() { | |
79 | if [ -x /sbin/pidof ]; then | |
80 | pid=$(/sbin/pidof -x udevd) | |
81 | [ -n "$pid" ] && kill $pid | |
82 | fi | |
83 | } | |
84 | ||
85 | set_hotplug_handler() { | |
86 | echo "" > /proc/sys/kernel/hotplug | |
87 | } | |
88 | ||
89 | # find subdirs mounted under $udev_root | |
90 | get_dev_mounts() { | |
91 | awk -vudev_root="$udev_root/" ' | |
92 | BEGIN { | |
93 | len = length(udev_root); | |
94 | } | |
95 | ||
96 | substr($2, 1, len) == udev_root { | |
97 | print substr($2, len + 1) | |
98 | }' /proc/mounts | |
99 | } | |
100 | ||
101 | show "Starting udev"; busy | |
102 | ||
103 | export ACTION=add | |
104 | prog=udev | |
105 | ret=0 | |
106 | ||
107 | # mount the devtmpfs on $udev_root, if not already done | |
108 | awk "\$2 == \"$udev_root\" && \$3 == \"devtmpfs\" { exit 1 }" /proc/mounts && { | |
109 | submounts=$(get_dev_mounts) | |
110 | ||
111 | if [ "$submounts" ]; then | |
112 | # mount to temporary location to be able to move submounts | |
113 | # this needs writable TMPDIR:-/tmp, so it won't work in early boot | |
114 | # but fix is simple: use initramfs instead of romfs | |
115 | devdir=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX) | |
116 | else | |
117 | devdir=$udev_root | |
118 | fi | |
119 | mount -n -o mode=0755 -t devtmpfs devtmpfs "$devdir" | |
120 | ret=$(( $ret + $? )) | |
121 | ||
122 | # relocate submounts | |
123 | for dir in $submounts; do | |
124 | mount -n --move $udev_root/$dir $devdir/$dir | |
125 | ret=$(( $ret + $? )) | |
126 | done | |
127 | ||
128 | if [ "$submounts" ]; then | |
129 | mount -n --move $devdir $udev_root | |
130 | rmdir $devdir | |
131 | fi | |
132 | } | |
133 | ||
134 | kill_udevd > "$udev_root/null" 2>&1 | |
135 | ||
136 | # Create required static device nodes for the current kernel | |
137 | create_static_nodes | |
138 | ||
139 | # Start udevd daemon | |
140 | $udevd --daemon; rc=$? | |
141 | test $rc -eq 0 && ok || fail | |
142 | ret=$(( $ret + $rc )) | |
143 | ||
144 | # Making extra nodes | |
145 | show "Setup extra nodes"; busy | |
146 | make_extra_nodes; rc=$? | |
147 | test $rc -eq 0 && ok || fail | |
148 | ret=$(( $ret + $rc )) | |
149 | ||
150 | if [ -f /sys/class/tty/console/uevent ]; then | |
151 | # Setting default hotplug handler | |
152 | set_hotplug_handler | |
153 | ret=$(( $ret + $? )) | |
154 | ||
155 | # retrigger all events | |
156 | show "Retrigger subsystems events"; busy | |
157 | /sbin/udevadm trigger --type=subsystems --action=add; rc=$? | |
158 | test $rc -eq 0 && ok || fail | |
159 | ret=$(( $ret + $rc )) | |
160 | ||
161 | show "Retrigger devices events"; busy | |
162 | /sbin/udevadm trigger --type=devices --action=add; rc=$? | |
163 | test $rc -eq 0 && ok || fail | |
164 | ret=$(( $ret + $rc )) | |
165 | ||
166 | # wait for the events to finish | |
167 | show "udevadm settle"; busy | |
168 | /sbin/udevadm settle; rc=$? | |
169 | test $rc -eq 0 && ok || fail | |
170 | ret=$(( $ret + $rc )) | |
171 | else | |
172 | echo "Kernel too old for this udev version" | |
173 | fi | |
174 | ||
175 | exit $ret |