target/image/x86/gen_image.sh

   1 #!/usr/bin/env bash
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 [ $# == 5 ] || {
   5     echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image>"
   6     exit 1
   7 }
   8
   9 file="$1"
  10 part1s="$2"
  11 part1d="$3"
  12 part2s="$4"
  13 part2f="$5"
  14
  15 head=16
  16 sect=63
  17 cyl=$(( ($part1s + $part2s) * 1024 * 1024 / ($head * $sect * 512)))
  18
  19 dd if=/dev/zero of="$file" bs=1M count=$(($part1s + $part2s))  2>/dev/null || exit
  20 fdisk -u -C $cyl -H $head -S $sect "$file" > /dev/null 2>/dev/null <<EOF
  21 n
  22 p
  23 1
  24
  25 +$(($part1s * 1024))K
  26 n
  27 p
  28 2
  29
  30
  31 w
  32 q
  33 EOF
  34
  35 block() {
  36     echo -e 'p\nq' | fdisk -u -C $cyl -H $head -S $sect "$file" | awk -v file="$file$1" -v n="$(($2 + 2))" '
  37 $1 == file {
  38     print $n * 512
  39 }'
  40 }
  41
  42 start="$(block 1 0)"
  43 end="$(block 1 1)"
  44 blocks="$(( ($end - $start) / 1024 ))"
  45
  46 genext2fs -d "$part1d" -b "$blocks" "$file.kernel"
  47 dd if="$file.kernel" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
  48 rm -f "$file.kernel"
  49
  50 start="$(block 2 0)"
  51 dd if="$part2f" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
  52
  53 which chpax >/dev/null && chpax -zp $(which grub)
  54 grub --device-map=/dev/null <<EOF
  55 device (hd0) $file
  56 geometry (hd0) $cyl $head $sect
  57 root (hd0,0)
  58 setup (hd0)
  59 EOF
  60