target/linux/mvebu/image/gen_mvebu_sdcard_img.sh

   1 #!/usr/bin/env bash
   2 #
   3 # Copyright (C) 2016 Josua Mayer
   4 #
   5 # This program is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU General Public License
   7 # as published by the Free Software Foundation; either version 2
   8 # of the License, or (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 #
  19
  20 usage() {
  21         echo "$0 <sectors> <outfile> <bootloader> [<type_partitionN> <sectors_partitionN> <img_partitionN>]?"
  22 }
  23
  24 # always require first 3 arguments
  25 # then in pairs up to 8 more for a total of up to 4 partitions
  26 if [ $# -lt 3 ] || [ $# -gt 15 ] || [ $(($#%3)) -ne 0 ]; then
  27         usage
  28         exit 1
  29 fi
  30
  31 set -e
  32
  33 # parameters
  34 IMGSIZE=$1
  35 OUTFILE="$2"
  36 BOOTLOADER="$3"
  37
  38 # calculate number of partitions from argument list
  39 NUMPARTS=$#
  40 ((NUMPARTS=(NUMPARTS-3)/3))
  41
  42 # find required applications
  43 FDISK=$(env PATH="/usr/local/sbin:/usr/sbin:/sbin:$PATH" which fdisk)
  44
  45 # generate image file
  46 printf "Creating $OUTFILE from /dev/zero: "
  47 dd if=/dev/zero of="$OUTFILE" bs=512 count=1 >/dev/null
  48 printf "Done\n"
  49
  50 # generate fdisk argument list
  51 printf "Generating fdisk argument list: "
  52 ARGSFILE=$(mktemp)
  53
  54 # empty partition table
  55 printf "o\n" >> $ARGSFILE
  56
  57 # actual partitions
  58 offset=2048
  59 for i in $(seq 1 1 $NUMPARTS); do
  60         ((n=3+3*i-2)); type=$(eval echo \${$n})
  61         ((n=3+3*i-1)); size=$(eval echo \${$n})
  62         ((end=offset+size-1))
  63
  64         printf "n\np\n%i\n\n%i\n" $i $end >> $ARGSFILE
  65
  66         # special case on first aprtition: fdisk wont ask which one
  67         if [ $i -eq 1 ]; then
  68                 printf "t\n%s\n" $type >> $ARGSFILE
  69         else
  70                 printf "t\n%i\n%s\n" $i $type >> $ARGSFILE
  71         fi
  72
  73         # add this partitions size to offset for next partition
  74         ((offset=end+1))
  75 done
  76
  77 # write and exit
  78 printf "w\n" >> $ARGSFILE
  79
  80 printf "Done\n"
  81
  82 # create real partition table using fdisk
  83 printf "Creating partition table: "
  84 cat $ARGSFILE | $FDISK "$OUTFILE" >/dev/null
  85 printf "Done\n"
  86
  87 # remove temporary files
  88 printf "Cleaning up: "
  89 rm -f $ARGSFILE
  90 printf "Done\n"
  91
  92 # install bootloader
  93 printf "Writing bootloader: "
  94 dd of="$OUTFILE" if="$BOOTLOADER" bs=512 seek=1 conv=notrunc 2>/dev/null
  95 printf "Done\n"
  96
  97 # write partition data
  98
  99 # offset of first partition is 2048
 100 offset=2048
 101 for i in $(seq 1 1 $NUMPARTS); do
 102         ((n=3+3*i-1)); size=$(eval echo \${$n})
 103         ((n=3+3*i));   img="$(eval echo \${$n})"
 104
 105         printf "Writing %s to partition %i: " "$img" $i
 106         dd if="$img" of="$OUTFILE" bs=512 seek=$offset conv=notrunc 2>/dev/null
 107         printf "Done\n"
 108
 109         # add this partitions size to offset for next partition
 110         ((offset=offset+size))
 111 done