Openwrt/scripts/combined-image.sh
Leonardo Mörlein b993b68b6c build: introduce $(MKHASH)
Before this commit, it was assumed that mkhash is in the PATH. While
this was fine for the normal build workflow, this led to some issues if

    make TOPDIR="$(pwd)" -C "$pkgdir" compile

was called manually. In most of the cases, I just saw warnings like this:

    make: Entering directory '/home/.../package/gluon-status-page'
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    [...]

While these were only warnings and the package still compiled sucessfully,
I also observed that some package even fail to build because of this.

After applying this commit, the variable $(MKHASH) is introduced. This
variable points to $(STAGING_DIR_HOST)/bin/mkhash, which is always the
correct path.

Signed-off-by: Leonardo Mörlein <me@irrelefant.net>
2021-05-13 15:13:15 +02:00

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#!/bin/sh
BLKSZ=65536
[ -f "$1" -a -f "$2" ] || {
echo "Usage: $0 <kernel image> <rootfs image> [output file]"
exit 1
}
IMAGE=${3:-openwrt-combined.img}
# Make sure provided images are 64k aligned.
kern="${IMAGE}.kernel"
root="${IMAGE}.rootfs"
dd if="$1" of="$kern" bs=$BLKSZ conv=sync 2>/dev/null
dd if="$2" of="$root" bs=$BLKSZ conv=sync 2>/dev/null
# Calculate md5sum over combined kernel and rootfs image.
md5=$(cat "$kern" "$root" | $MKHASH md5)
# Write image header followed by kernel and rootfs image.
# The header is padded to 64k, format is:
# CI magic word ("Combined Image")
# <kernel length> length of kernel encoded as zero padded 8 digit hex
# <rootfs length> length of rootfs encoded as zero padded 8 digit hex
# <md5sum> checksum of the combined kernel and rootfs image
( printf "CI%08x%08x%32s" \
$(stat -c "%s" "$kern") $(stat -c "%s" "$root") "${md5%% *}" | \
dd bs=$BLKSZ conv=sync;
cat "$kern" "$root"
) > ${IMAGE} 2>/dev/null
# Clean up.
rm -f "$kern" "$root"