release/src/router/busybox/examples/bootfloppy/mkrootfs.sh

   1 #!/bin/bash
   2 #
   3 # mkrootfs.sh - creates a root file system
   4 #
   5
   6 # TODO: need to add checks here to verify that busybox, uClibc and bzImage
   7 # exist
   8
   9
  10 # command-line settable variables
  11 BUSYBOX_DIR=..
  12 UCLIBC_DIR=../../uClibc
  13 TARGET_DIR=./loop
  14 FSSIZE=4000
  15 CLEANUP=1
  16 MKFS='mkfs.ext2 -F'
  17
  18 # don't-touch variables
  19 BASE_DIR=`pwd`
  20
  21
  22 while getopts 'b:u:s:t:Cm' opt
  23 do
  24         case $opt in
  25                 b) BUSYBOX_DIR=$OPTARG ;;
  26                 u) UCLIBC_DIR=$OPTARG ;;
  27                 t) TARGET_DIR=$OPTARG ;;
  28                 s) FSSIZE=$OPTARG ;;
  29                 C) CLEANUP=0 ;;
  30                 m) MKFS='mkfs.minix' ;;
  31                 *)
  32                         echo "usage: `basename $0` [-bu]"
  33                         echo "  -b DIR  path to busybox direcory (default ..)"
  34                         echo "  -u DIR  path to uClibc direcory (default ../../uClibc)"
  35                         echo "  -t DIR  path to target direcory (default ./loop)"
  36                         echo "  -s SIZE size of root filesystem in Kbytes (default 4000)"
  37                         echo "  -C      don't perform cleanup (umount target dir, gzip rootfs, etc.)"
  38                         echo "          (this allows you to 'chroot loop/ /bin/sh' to test it)"
  39                         echo "  -m      use minix filesystem (default is ext2)"
  40                         exit 1
  41                         ;;
  42         esac
  43 done
  44
  45
  46
  47
  48 # clean up from any previous work
  49 mount | grep -q loop
  50 [ $? -eq 0 ] && umount $TARGET_DIR
  51 [ -d $TARGET_DIR ] && rm -rf $TARGET_DIR/
  52 [ -f rootfs ] && rm -f rootfs
  53 [ -f rootfs.gz ] && rm -f rootfs.gz
  54
  55
  56 # prepare root file system and mount as loopback
  57 dd if=/dev/zero of=rootfs bs=1k count=$FSSIZE
  58 $MKFS -i 2000 rootfs
  59 mkdir $TARGET_DIR
  60 mount -o loop,exec rootfs $TARGET_DIR # must be root
  61
  62
  63 # install uClibc
  64 mkdir -p $TARGET_DIR/lib
  65 cd $UCLIBC_DIR
  66 make INSTALL_DIR=
  67 cp -a libc.so* $BASE_DIR/$TARGET_DIR/lib
  68 cp -a uClibc*.so $BASE_DIR/$TARGET_DIR/lib
  69 cp -a ld.so-1/d-link/ld-linux-uclibc.so* $BASE_DIR/$TARGET_DIR/lib
  70 cp -a ld.so-1/libdl/libdl.so* $BASE_DIR/$TARGET_DIR/lib
  71 cp -a crypt/libcrypt.so* $BASE_DIR/$TARGET_DIR/lib
  72 cd $BASE_DIR
  73
  74
  75 # install busybox and components
  76 cd $BUSYBOX_DIR
  77 make distclean
  78 make CC=$BASE_DIR/$UCLIBC_DIR/extra/gcc-uClibc/i386-uclibc-gcc
  79 make CONFIG_PREFIX=$BASE_DIR/$TARGET_DIR install
  80 cd $BASE_DIR
  81
  82
  83 # make files in /dev
  84 mkdir $TARGET_DIR/dev
  85 ./mkdevs.sh $TARGET_DIR/dev
  86
  87
  88 # make files in /etc
  89 cp -a etc $TARGET_DIR
  90 ln -s /proc/mounts $TARGET_DIR/etc/mtab
  91
  92
  93 # other miscellaneous setup
  94 mkdir $TARGET_DIR/initrd
  95 mkdir $TARGET_DIR/proc
  96
  97
  98 # Done. Maybe do cleanup.
  99 if [ $CLEANUP -eq 1 ]
 100 then
 101         umount $TARGET_DIR
 102         rmdir $TARGET_DIR
 103         gzip -9 rootfs
 104 fi
 105