Files
linuxkit/alpine/base/pad4/pad4.sh
Justin Cormack 7195763e66 Use an image to pad initrd files to 4 bytes
This saves a lot of duplicated nasty Makefile code, means and generally
cleans things up.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
2016-12-12 14:12:13 -08:00

27 lines
404 B
Bash
Executable File

#!/bin/sh
cd /tmp
cat > initrd.img
SIZE=$(stat -c "%s" initrd.img)
SIZE4=$(( $SIZE / 4 \* 4 ))
DIFF=$(( $SIZE - $SIZE4 ))
[ $DIFF -ne 0 ] && DIFF=$(( 4 - $DIFF ))
dd if=/dev/zero bs=1 count=$DIFF of=zeropad
cat zeropad >> initrd.img
SIZE=$(stat -c "%s" initrd.img)
SIZE4=$(( $SIZE / 4 \* 4 ))
DIFF=$(( $SIZE - $SIZE4 ))
if [ $DIFF -ne 0 ]
then
echo "Bad alignment" >2
exit 1
fi
cat initrd.img