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