init

   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 -n " ${BOLD}${BLUE}*${NORM} Creating and mounting tmpfs... "
  33         mkdir /.tmpfs
  34         mount -t tmpfs tmpfs /.tmpfs
  35         checkReturn
  36
  37         echo -e " ${BOLD}${BLUE}*${NORM} Searching for the CRUX media..."
  38         mkdir -p /.tmpfs/.media
  39         CRUXMEDIA=""
  40         CDROM_DEVICES="`grep 'drive name:' /proc/sys/dev/cdrom/info | awk '{ print $3 }'`"
  41         MMC_DEVICES="`grep -E 'mmcblk' /proc/partitions | awk '{ print $4 }'`"
  42         BLOCK_DEVICES="`grep -E '[sh]d' /proc/partitions | awk '{ print $4 }'`"
  43         for DEV in $CDROM_DEVICES $MMC_DEVICES $BLOCK_DEVICES
  44         do
  45                 DEV="/dev/$DEV"
  46                 mount -r $DEV /.tmpfs/.media 2> /dev/null
  47                 if [ $? -eq 0 ]
  48                 then
  49                         echo -e -n "   ${BOLD}${GREEN}*${NORM} Found media on $DEV"
  50                         if [ -e /.tmpfs/.media/crux-media ]
  51                         then
  52                                 echo ", CRUX media."
  53                                 CRUXMEDIA=$DEV
  54                                 break
  55                         else
  56                                 echo ", but it's not the CRUX media."
  57                                 umount /.tmpfs/.media
  58                         fi
  59                 else
  60                         echo -e "   ${BOLD}${YELLOW}*${NORM} No media found on $DEV."
  61                 fi
  62         done
  63
  64         # check if the media was mounted properly. if not, spawn a shell
  65         if [ ! -e /.tmpfs/.media/crux-media ]
  66         then
  67                 echo -e " ${BOLD}${RED}*${NORM} The CRUX media was not properly mounted!"
  68                 echo " Spawning a shell for you to attempt to fix this problem. If"
  69                 echo " you are able to find the correct device, mount it at"
  70                 echo " /.tmpfs/.media and then log out of this shell to continue."
  71                 echo " If you are NOT able to fix the problem, installation will"
  72                 echo " not be possible."
  73                 echo
  74                 /bin/sh
  75         fi
  76
  77         # check again and stop if it's still not there
  78         if [ ! -e /.tmpfs/.media/crux-media ]
  79         then
  80                 echo -e " ${BOLD}${RED}*${NORM} The CRUX media still appears not to be"
  81                 echo " found and installation will not continue."
  82                 echo
  83                 sleep 99999
  84                 exit 1
  85         fi
  86
  87         echo -e " ${BOLD}${BLUE}*${NORM} Populating root filesystem..."
  88         mkdir -p /newroot
  89         echo -e -n "   ${BOLD}${BLUE}*${NORM} Mounting new root filesystem... "
  90         mount -t tmpfs tmpfs /newroot
  91         checkReturn
  92         echo -e -n "   ${BOLD}${BLUE}*${NORM} Copying files from rootfs.tar.xz... "
  93         tar -xpf /.tmpfs/.media/rootfs.tar.xz -C /newroot
  94         checkReturn
  95         echo -e -n "   ${BOLD}${BLUE}*${NORM} Copying devices from rootfs... "
  96         cp -af /dev/* /newroot/dev/
  97         checkReturn
  98         mkdir -p /newroot/dev/pts /newroot/media
  99
 100         # the media gets unmounted here and remounted after switch_root
 101         umount /.tmpfs/.media
 102         rmdir /.tmpfs/.media
 103         sed -i -e "s,#CRUXMEDIA#,${CRUXMEDIA}," /newroot/etc/fstab
 104
 105         echo -e -n " ${BOLD}${BLUE}*${NORM} Unmounting tmpfs... "
 106         umount /.tmpfs
 107         checkReturn
 108         rmdir /.tmpfs
 109 }
 110
 111 /bin/busybox --install -s /bin
 112
 113 # main script
 114
 115 echo ""
 116 echo -e "${BOLD}CRUX-ARM 2.7.1 - ${BLUE}http://crux-arm.nu/${NORM}"
 117 echo ""
 118
 119 exec >/dev/console </dev/console 2>&1
 120
 121 echo -e -n " ${BOLD}${BLUE}*${NORM} Mounting "
 122 echo -e -n "${BOLD}${GREEN}/proc${NORM}"
 123 mount -t proc proc /proc
 124
 125 PRINTK="`cat /proc/sys/kernel/printk`"
 126 echo "0" > /proc/sys/kernel/printk
 127
 128 echo -e ", ${BOLD}${GREEN}/sys${NORM}."
 129 mount -t sysfs sysfs /sys
 130
 131 echo -e -n " ${BOLD}${BLUE}*${NORM} Populating /dev via mdev... "
 132 mdev -s
 133 checkReturn
 134 echo -e -n "   ${BOLD}${BLUE}*${NORM} Registering mdev as hotplug agent... "
 135 echo "/bin/mdev" > /proc/sys/kernel/hotplug
 136 checkReturn
 137
 138 if [ -d /lib/modules ]
 139 then
 140         echo -e -n " ${BOLD}${BLUE}*${NORM} Loading modules... "
 141         # TODO
 142 else
 143         echo -e " ${BOLD}${YELLOW}*${NORM} No modules were found in the initial RAM filesystem."
 144 fi
 145
 146 grep -q "devicetimeout=*" /proc/cmdline
 147 if [ $? -eq 0 ]
 148 then
 149         for opt in `cat /proc/cmdline`
 150         do
 151                 echo "$opt" | grep -q "devicetimeout="
 152                 if [ $? -eq 0 ]
 153                 then
 154                         DEVTIMEOUT=`echo $opt | cut -d'=' -f2`
 155                 fi
 156         done
 157 else
 158         DEVTIMEOUT=10
 159 fi
 160 echo -e " ${BOLD}${BLUE}*${NORM} Waiting $DEVTIMEOUT seconds for devices to settle..."
 161 sleep $DEVTIMEOUT
 162
 163 # if root=/dev/XXX was specified on the command line, use that as the new root
 164 # instead of searching for the media and using it. if it fails, fall back to
 165 # the media
 166 grep -q "root=/dev/*" /proc/cmdline
 167 if [ $? -eq 0 ]
 168 then
 169         for opt in `cat /proc/cmdline`
 170         do
 171                 echo "$opt" | grep -q "root="
 172                 if [ $? -eq 0 ]
 173                 then
 174                         ROOTDEV=`echo $opt | cut -d'=' -f2`
 175                 fi
 176         done
 177         mkdir -p /newroot
 178         # check the specified root device to see if it has an init
 179         mount $ROOTDEV /newroot
 180         if [ $? -ne 0 ]
 181         then
 182                 echo -e " ${BOLD}${RED}*${NORM} Unable to mount the specified root device! Falling back to the live media."
 183                 find_and_mount_media
 184         else
 185                 if [ -x /newroot/sbin/init ]
 186                 then
 187                         echo -e " ${BOLD}${BLUE}*${NORM} Mounted root device $ROOTDEV."
 188                 else
 189                         echo -e " ${BOLD}${RED}*${NORM} The specified root device ($ROOTDEV) does not appear to be usable! Falling back to the live media."
 190                         umount /newroot
 191                         find_and_mount_media
 192                 fi
 193         fi
 194 else
 195         find_and_mount_media
 196 fi
 197
 198 echo -e " ${BOLD}${BLUE}*${NORM} Switching root.\n"
 199 echo "$PRINTK" > /proc/sys/kernel/printk
 200 echo > /proc/sys/kernel/hotplug
 201 umount /sys
 202 umount /proc
 203 exec /bin/switch_root /newroot /sbin/init
 204
 205 echo "Something's broken, here's a shell."
 206 exec /bin/sh
 207
 208 # End of file