modules.d/99base/init

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4 #
   5 # Licensed under the GPLv2
   6 #
   7 # Copyright 2008-2010, Red Hat, Inc.
   8 # Harald Hoyer <harald@redhat.com>
   9 # Jeremy Katz <katzj@redhat.com>
  10
  11 wait_for_loginit()
  12 {
  13     if getarg rdinitdebug; then
  14         set +x
  15         exec 0<>/dev/console 1<>/dev/console 2<>/dev/console
  16         # wait for loginit
  17         i=0
  18         while [ $i -lt 10 ]; do
  19             j=$(jobs)
  20             [ -z "$j" ] && break
  21             [ -z "${j##*Running*}" ] || break
  22             sleep 0.1
  23             i=$(($i+1))
  24         done
  25         [ $i -eq 10 ] && kill %1 >/dev/null 2>&1
  26
  27         while pidof -x /sbin/loginit >/dev/null 2>&1; do
  28             for pid in $(pidof -x /sbin/loginit); do
  29                 kill $HARD $pid >/dev/null 2>&1
  30             done
  31             HARD="-9"
  32         done
  33         set -x
  34     fi
  35 }
  36
  37 emergency_shell()
  38 {
  39     if [ "$1" = "-n" ]; then
  40         _rdshell_name=$2
  41         shift 2
  42     else
  43         _rdshell_name=dracut
  44     fi
  45     wait_for_loginit
  46     echo ; echo
  47     echo $@
  48     source_all emergency
  49     echo
  50     if getarg rdshell || getarg rdbreak; then
  51         echo "Dropping to debug shell."
  52         echo
  53         export PS1="$_rdshell_name:\${PWD}# "
  54         [ -e /.profile ] || echo "exec 0<>/dev/console 1<>/dev/console 2<>/dev/console" > /.profile
  55         sh -i -l
  56     else
  57         echo "Boot has failed, sleeping forever."
  58         while :; do sleep 365d;done
  59     fi
  60 }
  61
  62 export PATH=/sbin:/bin:/usr/sbin:/usr/bin
  63 export TERM=linux
  64 NEWROOT="/sysroot"
  65
  66 trap "emergency_shell Signal caught!" 0
  67 # set umask
  68 OLD_UMASK=$(umask)
  69 umask 0007
  70
  71 RDDEBUG=""
  72 . /lib/dracut-lib.sh
  73
  74 mknod -m 0666 /dev/null c 1 3
  75
  76 # mount some important things
  77 mount -t proc /proc /proc >/dev/null 2>&1
  78 mount -t sysfs /sys /sys >/dev/null 2>&1
  79
  80 read RDTIMESTAMP _tmp < /proc/uptime
  81 unset _tmp
  82
  83 if [ ! -c /dev/ptmx ]; then
  84     # try to mount devtmpfs
  85     if ! mount -t devtmpfs -omode=0755 udev /dev >/dev/null 2>&1; then
  86         # if it failed fall back to normal tmpfs
  87         mount -t tmpfs -omode=0755 udev /dev >/dev/null 2>&1
  88         # Make some basic devices first, let udev handle the rest
  89         mknod -m 0666 /dev/null c 1 3
  90         mknod -m 0666 /dev/ptmx c 5 2
  91         mknod -m 0600 /dev/console c 5 1
  92         mknod -m 0660 /dev/kmsg c 1 11
  93     fi
  94 fi
  95
  96 ln -s /proc/self/fd /dev/fd >/dev/null 2>&1
  97
  98 if getarg rdinitdebug; then
  99     getarg quiet && DRACUT_QUIET="yes"
 100     mkfifo /dev/initlog.pipe
 101     /sbin/loginit $DRACUT_QUIET </dev/initlog.pipe >/dev/console 2>&1 &
 102     exec >/dev/initlog.pipe 2>&1
 103 else
 104     exec 0<>/dev/console 1<>/dev/console 2<>/dev/console
 105 fi
 106
 107 setdebug
 108
 109 mkdir /dev/shm
 110 mkdir /dev/pts
 111 mount -t devpts -o gid=5,mode=620 devpts /dev/pts >/dev/null 2>&1
 112 mount -t tmpfs tmpfs /dev/shm >/dev/null 2>&1
 113 mkdir -m 0755 /dev/.udev
 114 mkdir -m 0755 /dev/.udev/rules.d
 115
 116 UDEVVERSION=$(udevadm --version)
 117
 118 source_conf /etc/conf.d
 119
 120 # run scriptlets to parse the command line
 121 getarg 'rdbreak=cmdline' && emergency_shell -n cmdline "Break before cmdline"
 122 source_all cmdline
 123
 124 [ -z "$root" ] && die "No or empty root= argument"
 125 [ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"
 126
 127 # Network root scripts may need updated root= options,
 128 # so deposit them where they can see them (udev purges the env)
 129 {
 130     echo "root='$root'"
 131     echo "rflags='$rflags'"
 132     echo "fstype='$fstype'"
 133     echo "netroot='$netroot'"
 134     echo "NEWROOT='$NEWROOT'"
 135 } > /tmp/root.info
 136
 137 # pre-udev scripts run before udev starts, and are run only once.
 138 getarg 'rdbreak=pre-udev' && emergency_shell -n pre-udev "Break before pre-udev"
 139 source_all pre-udev
 140
 141 # start up udev and trigger cold plugs
 142 udevd --daemon --resolve-names=never
 143
 144 UDEV_LOG_PRIO_ARG=--log-priority
 145 UDEV_QUEUE_EMPTY="udevadm settle --timeout=0"
 146
 147 if [ $UDEVVERSION -lt 140 ]; then
 148     UDEV_LOG_PRIO_ARG=--log_priority
 149     UDEV_QUEUE_EMPTY="udevadm settle --timeout=1"
 150 fi
 151
 152 getarg rdudevinfo && udevadm control $UDEV_LOG_PRIO_ARG=info
 153 getarg rdudevdebug && udevadm control $UDEV_LOG_PRIO_ARG=debug
 154
 155 getarg 'rdbreak=pre-trigger' && emergency_shell -n pre-trigger "Break before pre-trigger"
 156 source_all pre-trigger
 157
 158 # then the rest
 159 udevadm trigger --action=add $udevtriggeropts  >/dev/null 2>&1
 160
 161 getarg 'rdbreak=initqueue' && emergency_shell -n initqueue "Break before initqueue"
 162
 163 RDRETRY=$(getarg 'rd_retry=')
 164 RDRETRY=${RDRETRY:-20}
 165 RDRETRY=$(($RDRETRY*2))
 166
 167 i=0
 168 while :; do
 169
 170     check_finished && break
 171
 172     udevsettle
 173
 174     check_finished && break
 175
 176     if [ -f /initqueue/work ]; then
 177         rm /initqueue/work
 178     fi
 179
 180     for job in /initqueue/*.sh; do
 181         [ -e "$job" ] || break
 182         job=$job . $job
 183         check_finished && break 2
 184     done
 185
 186     $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue
 187
 188     modprobe scsi_wait_scan && rmmod scsi_wait_scan
 189
 190     $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue
 191
 192     for job in /initqueue-settled/*.sh; do
 193         [ -e "$job" ] || break
 194         job=$job . $job
 195         check_finished && break 2
 196     done
 197
 198     $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue
 199
 200     # no more udev jobs and queues empty.
 201     sleep 0.5
 202
 203     # dirty hack for some cdrom drives,
 204     # which report no medium for quiet
 205     # some time.
 206     for cdrom in /sys/block/sr*; do
 207         [ -e "$cdrom" ] || continue
 208         # skip, if cdrom medium was already found
 209         strstr "$(udevadm info --query=env --path=${cdrom##/sys})" \
 210             ID_CDROM_MEDIA && continue
 211         echo change > "$cdrom/uevent"
 212     done
 213
 214     i=$(($i+1))
 215     [ $i -gt $RDRETRY ] \
 216         && { flock -s 9 ; emergency_shell "No root device found"; } 9>/.console_lock
 217 done
 218 unset job
 219 unset queuetriggered
 220
 221 # pre-mount happens before we try to mount the root filesystem,
 222 # and happens once.
 223 getarg 'rdbreak=pre-mount' && emergency_shell -n pre-mount "Break pre-mount"
 224 source_all pre-mount
 225
 226
 227 getarg 'rdbreak=mount' && emergency_shell -n mount "Break mount"
 228 # mount scripts actually try to mount the root filesystem, and may
 229 # be sourced any number of times. As soon as one suceeds, no more are sourced.
 230 i=0
 231 while :; do
 232     [ -d "$NEWROOT/proc" ] && break;
 233     for f in /mount/*.sh; do
 234         [ -f "$f" ] && . "$f"
 235         [ -d "$NEWROOT/proc" ] && break;
 236     done
 237
 238     i=$(($i+1))
 239     [ $i -gt 20 ] \
 240         && { flock -s 9 ; emergency_shell "Can't mount root filesystem"; } 9>/.console_lock
 241 done
 242
 243 {
 244     echo -n "Mounted root filesystem "
 245     while read dev mp rest; do [ "$mp" = "$NEWROOT" ] && echo $dev; done < /proc/mounts
 246 } | vinfo
 247
 248 # pre pivot scripts are sourced just before we switch over to the new root.
 249 getarg 'rdbreak=pre-pivot' && emergency_shell -n pre-pivot "Break pre-pivot"
 250 source_all pre-pivot
 251
 252 # by the time we get here, the root filesystem should be mounted.
 253 # Try to find init.
 254 for i in "$(getarg init=)" /sbin/init /etc/init /init /bin/sh; do
 255     [ -f "$NEWROOT$i" -a -x "$NEWROOT$i" ] && { INIT="$i"; break; }
 256 done
 257
 258 [ "$INIT" ] || {
 259     echo "Cannot find init!"
 260     echo "Please check to make sure you passed a valid root filesystem!"
 261     emergency_shell
 262 }
 263
 264 getarg rdbreak && emergency_shell -n switch_root "Break before switch_root"
 265
 266 # stop udev queue before killing it
 267 udevadm control --stop-exec-queue
 268
 269 HARD=""
 270 while pidof udevd >/dev/null 2>&1; do
 271     for pid in $(pidof udevd); do
 272         kill $HARD $pid >/dev/null 2>&1
 273     done
 274     HARD="-9"
 275 done
 276
 277 # Clean up the environment
 278 for i in $(export -p); do
 279     i=${i#declare -x}
 280         i=${i#export}
 281             i=${i%%=*}
 282             [ "$i" = "root" -o "$i" = "PATH" -o "$i" = "HOME" -o "$i" = "TERM" ] || unset $i
 283 done
 284
 285 initargs=""
 286
 287 read CLINE </proc/cmdline
 288 if getarg init= >/dev/null ; then
 289     ignoreargs="console BOOT_IMAGE"
 290     # only pass arguments after init= to the init
 291     CLINE=${CLINE#*init=}
 292         set $CLINE
 293         shift
 294         for x in "$@"; do
 295             for s in $ignoreargs; do
 296                 [ "${x%%=*}" = $s ] && continue 2
 297             done
 298             initargs="$initargs $x"
 299         done
 300         unset CLINE
 301 else
 302     set $CLINE
 303     shift
 304     for x in "$@"; do
 305         case "$x" in
 306             [0-9]|s|S|single|emergency|auto ) \
 307                 initargs="$initargs $x"
 308                 ;;
 309         esac
 310     done
 311     initargs="$initargs"
 312 fi
 313
 314 # Debug: Copy state
 315 if getarg rdcopystate; then
 316     mkdir /dev/.initramfs/
 317     cp /tmp/* /dev/.initramfs/ >/dev/null 2>&1
 318 fi
 319
 320 if getarg rd.timestamp; then
 321     export RDTIMESTAMP
 322 else
 323     unset RDTIMESTAMP
 324 fi
 325
 326 info "Switching root"
 327
 328 wait_for_loginit
 329
 330 umask $OLD_UMASK
 331 unset HOME
 332 unset TERM
 333 exec switch_root "$NEWROOT" "$INIT" $initargs || {
 334     echo "Something went very badly wrong in the initramfs.  Please "
 335     echo "file a bug against dracut."
 336     emergency_shell
 337 }