scripts/gen_image_generic.sh

   1 #!/bin/sh
   2 # Copyright (C) 2006-2012 OpenWrt.org
   3 set -e -x
   4 if [ $# -ne 5 ] && [ $# -ne 6 ]; then
   5     echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image> [<align>]"
   6     exit 1
   7 fi
   8
   9 OUTPUT="$1"
  10 KERNELSIZE="$2"
  11 KERNELDIR="$3"
  12 KERNELPARTTYPE=${KERNELPARTTYPE:-83}
  13 ROOTFSSIZE="$4"
  14 ROOTFSIMAGE="$5"
  15 ROOTFSPARTTYPE=${ROOTFSPARTTYPE:-83}
  16 ALIGN="$6"
  17
  18 rm -f "$OUTPUT"
  19
  20 head=16
  21 sect=63
  22
  23 # create partition table
  24 set $(ptgen -o "$OUTPUT" -h $head -s $sect ${GUID:+-g} -t "${KERNELPARTTYPE}" -p "${KERNELSIZE}m${PARTOFFSET:+@$PARTOFFSET}" -t "${ROOTFSPARTTYPE}" -p "${ROOTFSSIZE}m" ${ALIGN:+-l $ALIGN} ${SIGNATURE:+-S 0x$SIGNATURE} ${GUID:+-G $GUID})
  25
  26 KERNELOFFSET="$(($1 / 512))"
  27 KERNELSIZE="$2"
  28 ROOTFSOFFSET="$(($3 / 512))"
  29 ROOTFSSIZE="$(($4 / 512))"
  30
  31 # Using mcopy -s ... is using READDIR(3) to iterate through the directory
  32 # entries, hence they end up in the FAT filesystem in traversal order which
  33 # breaks reproducibility.
  34 # Implement recursive copy with reproducible order.
  35 dos_dircopy() {
  36   local entry
  37   local baseentry
  38   for entry in "$1"/* ; do
  39     if [ -f "$entry" ]; then
  40       mcopy -i "$OUTPUT.kernel" "$entry" ::"$2"
  41     elif [ -d "$entry" ]; then
  42       baseentry="$(basename "$entry")"
  43       mmd -i "$OUTPUT.kernel" ::"$2""$baseentry"
  44       dos_dircopy "$entry" "$2""$baseentry"/
  45     fi
  46   done
  47 }
  48
  49 [ -n "$PADDING" ] && dd if=/dev/zero of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc count="$ROOTFSSIZE"
  50 dd if="$ROOTFSIMAGE" of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc
  51
  52 if [ -n "$GUID" ]; then
  53     [ -n "$PADDING" ] && dd if=/dev/zero of="$OUTPUT" bs=512 seek="$((ROOTFSOFFSET + ROOTFSSIZE))" conv=notrunc count="$sect"
  54     mkfs.fat --invariant -n kernel -C "$OUTPUT.kernel" -S 512 "$((KERNELSIZE / 1024))"
  55     LC_ALL=C dos_dircopy "$KERNELDIR" /
  56 else
  57     make_ext4fs -J -L kernel -l "$KERNELSIZE" ${SOURCE_DATE_EPOCH:+-T ${SOURCE_DATE_EPOCH}} "$OUTPUT.kernel" "$KERNELDIR"
  58 fi
  59 dd if="$OUTPUT.kernel" of="$OUTPUT" bs=512 seek="$KERNELOFFSET" conv=notrunc
  60 rm -f "$OUTPUT.kernel"