filesystem/rc

   1 #!/bin/sh
   2
   3 #
   4 # initramfs /init (busybox ash)
   5 #
   6
   7 # color codes and some predefined texts
   8 BOLD="\033[1m"
   9 NORM="\033[0m"
  10 RED="\033[31m"
  11 GREEN="\033[32m"
  12 YELLOW="\033[33m"
  13 BLUE="\033[34m"
  14 OK="${BOLD}${GREEN}OK${NORM}"
  15 FAILED="${BOLD}${RED}FAILED${NORM}"
  16
  17 # helper functions
  18
  19 # check an exit value and print a colored status
  20 checkReturn() {
  21         if [ $? -ne 0 ]
  22         then
  23                 echo -e $FAILED
  24         else
  25                 echo -e $OK
  26         fi
  27 }
  28
  29 # search for and mount the crux media, populate a tmpfs from it,
  30 # and prepare /newroot for switch_root at the end of the script
  31 find_and_mount_media() {
  32         echo -e " ${BOLD}${BLUE}*${NORM} Searching for the CRUX media..."
  33         mkdir -p /media
  34         CRUXMEDIA=""
  35         MMC_DEVICES="`grep -E 'mmcblk' /proc/partitions | awk '{ print $4 }'`"
  36         BLOCK_DEVICES="`grep -E '[sh]d' /proc/partitions | awk '{ print $4 }'`"
  37         for DEV in $MMC_DEVICES $BLOCK_DEVICES
  38         do
  39                 DEV="/dev/$DEV"
  40                 mount -r $DEV /media 2> /dev/null
  41                 if [ $? -eq 0 ]
  42                         then
  43                         echo -e -n "   ${BOLD}${GREEN}*${NORM} Found media on $DEV"
  44                         if [ -e /media/crux-media ]
  45                         then
  46                                 echo ", CRUX media."
  47                                 CRUXMEDIA=$DEV
  48                                 ln -s $DEV /dev/media
  49                                 break
  50                         else
  51                                 echo ", but it's not the CRUX media."
  52                                 umount /media
  53                         fi
  54                 else
  55                         echo -e "   ${BOLD}${YELLOW}*${NORM} No media found on $DEV."
  56                 fi
  57         done
  58
  59         # check if the media was mounted properly. if not, spawn a shell
  60         if [ ! -e /media/crux-media ]
  61         then
  62                 echo
  63                 echo -e " ${BOLD}${RED}*${NORM} The CRUX media was not properly mounted!"
  64                 echo " Spawning a shell for you to attempt to fix this problem. If"
  65                 echo " you are able to find the correct device, mount it at"
  66                 echo " /media and then log out of this shell to continue."
  67                 echo " If you are NOT able to fix the problem, installation will"
  68                 echo " not be possible."
  69                 echo
  70                 /bin/sh
  71         fi
  72
  73         # check again and stop if it's still not there
  74         if [ ! -e /media/crux-media ]
  75         then
  76                 echo
  77                 echo -e " ${BOLD}${RED}*${NORM} The CRUX media still appears not to be"
  78                 echo " found and installation will not continue."
  79                 echo
  80         else
  81                 # configure modules
  82                 MODULES="`find /media/crux/kernel -type f -name 'modules-*.tar.*'`"
  83                 if [ ! -z "$MODULES" ]; then
  84                         tar -C /tmp -xf $MODULES
  85                         cd /lib && ln -s /tmp/lib/* .
  86                         depmod
  87                 fi
  88                 # configure pkgutils
  89                 PKGUTILS="`find /media/crux/core -type f -name 'pkgutils#*.pkg.tar.*'`"
  90                 if [ ! -z "$PKGUTILS" ]; then
  91                         tar -C /tmp -xf $PKGUTILS
  92                         cd /usr/bin && ln -s /tmp/usr/bin/* .
  93                         cd /etc && ln -s /tmp/etc/* .
  94                 fi
  95         fi
  96 }
  97
  98 /bin/busybox --install -s /bin
  99
 100 #
 101 # main script
 102 #
 103
 104 echo ""
 105 echo -e "${BOLD}CRUX-ARM 2.7.1 - ${BLUE}http://crux-arm.nu/${NORM}"
 106 echo ""
 107
 108 exec >/dev/console </dev/console 2>&1
 109
 110 echo -e -n " ${BOLD}${BLUE}*${NORM} Mounting "
 111 echo -e -n "${BOLD}${GREEN}/proc${NORM}"
 112 mount -t proc proc /proc
 113
 114 PRINTK="`cat /proc/sys/kernel/printk`"
 115 echo "0" > /proc/sys/kernel/printk
 116
 117 echo -e ", ${BOLD}${GREEN}/sys${NORM}."
 118 mount -t sysfs sysfs /sys
 119
 120 echo -e -n " ${BOLD}${BLUE}*${NORM} Populating /dev via mdev... "
 121 mdev -s
 122 checkReturn
 123
 124 echo -e -n " ${BOLD}${BLUE}*${NORM} Registering mdev as hotplug agent... "
 125 echo "/bin/mdev" > /proc/sys/kernel/hotplug
 126 checkReturn
 127
 128 echo -e -n " ${BOLD}${BLUE}*${NORM} Creating and mounting /dev/pts... "
 129 mkdir /dev/pts
 130 mount -t devpts devpts /dev/pts
 131 checkReturn
 132
 133 echo -e -n " ${BOLD}${BLUE}*${NORM} Starting kernel log daemon... "
 134 klogd
 135 checkReturn
 136
 137 echo -e -n " ${BOLD}${BLUE}*${NORM} Setting hostname... "
 138 hostname crux
 139 checkReturn
 140
 141 echo -e -n " ${BOLD}${BLUE}*${NORM} Loading network loopback device... "
 142 ip addr add 127.0.0.1/8 dev lo broadcast + scope host && \
 143 ip link set lo up && \
 144 echo "127.0.0.1 localhost crux" > /etc/hosts
 145 checkReturn
 146
 147 echo -e -n " ${BOLD}${BLUE}*${NORM} Saving boot messages... "
 148 dmesg > /var/log/boot
 149 checkReturn
 150
 151 grep -q "devicetimeout=*" /proc/cmdline
 152 if [ $? -eq 0 ]
 153 then
 154         for opt in `cat /proc/cmdline`
 155         do
 156                 echo "$opt" | grep -q "devicetimeout="
 157                 if [ $? -eq 0 ]
 158                 then
 159                         DEVTIMEOUT=`echo $opt | cut -d'=' -f2`
 160                 fi
 161         done
 162 else
 163         DEVTIMEOUT=10
 164 fi
 165 echo -e " ${BOLD}${BLUE}*${NORM} Waiting $DEVTIMEOUT seconds for devices to settle..."
 166 sleep $DEVTIMEOUT
 167
 168 # if root=/dev/XXX was specified on the command line, use that as the new root
 169 # instead of searching for the media and using it. if it fails, fall back to the media
 170 grep -q "root=/dev/*" /proc/cmdline
 171 if [ $? -eq 0 ]
 172 then
 173         for opt in `cat /proc/cmdline`
 174         do
 175                 echo "$opt" | grep -q "root="
 176                 if [ $? -eq 0 ]
 177                 then
 178                         ROOTDEV=`echo $opt | cut -d'=' -f2`
 179                 fi
 180         done
 181         mkdir -p /newroot
 182         # check the specified root device to see if it has an init
 183         mount $ROOTDEV /newroot
 184         if [ $? -ne 0 ]
 185         then
 186                 echo -e " ${BOLD}${RED}*${NORM} Unable to mount the specified root device! Falling back to the live media."
 187                 find_and_mount_media
 188         else
 189                 if [ -x /newroot/sbin/init ]
 190                 then
 191                         echo -e " ${BOLD}${BLUE}*${NORM} Mounted root device $ROOTDEV."
 192                 else
 193                         echo -e " ${BOLD}${RED}*${NORM} The specified root device ($ROOTDEV) does not appear to be usable! Falling back to the live media."
 194                         umount /newroot
 195                         find_and_mount_media
 196                 fi
 197         fi
 198 else
 199         find_and_mount_media
 200 fi
 201
 202 echo -e "${BOLD}${BLUE}*${NORM} Switching root.\n"
 203 echo "$PRINTK" > /proc/sys/kernel/printk
 204 echo > /proc/sys/kernel/hotplug
 205 umount /sys
 206 umount /proc
 207 exec /bin/switch_root /newroot /sbin/init
 208
 209 echo "Something's broken, here's a shell."
 210 exec /bin/sh
 211
 212 # End of file