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combined-ext-image.sh: generate image in temp dir

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The new build commands operate on the input image and use it again as
output image. This conflicts with the way combined-ext-image.sh was
operating. It required that input and output files are different files and
and that it can write freely to the output file.

This can be avoided when all intermediate build steps by
combined-ext-image.sh are done in a temporary directory. The output file is
then only overwritten in the last step.

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
This commit is contained in:
Sven Eckelmann 2017-11-30 14:30:06 +01:00 committed by Mathias Kresin
parent 9514cde2b9
commit 1a384ac0b5
1 changed files with 23 additions and 6 deletions
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29
scripts/combined-ext-image.sh
View file

@ -22,6 +22,8 @@
## version history
# * version 1: initial file format with num files / name / length / md5 checksum
set -e
ME="${0##*/}"
usage() {
@ -38,7 +40,21 @@ IMG_OUT=$1; shift
FILE_NUM=$(($# / 2))
FILES=""
printf "CE%02x%-32s%02x" $CE_VERSION "$IMG_TYPE" $FILE_NUM > $IMG_OUT
tmpdir="$( mktemp -d 2> /dev/null )"
if [ -z "$tmpdir" ]; then
# try OSX signature
tmpdir="$( mktemp -t 'ubitmp' -d )"
fi
if [ -z "$tmpdir" ]; then
exit 1
fi
trap "rm -rf $tmpdir" EXIT
IMG_TMP_OUT="${tmpdir}/out"
printf "CE%02x%-32s%02x" $CE_VERSION "$IMG_TYPE" $FILE_NUM > "${IMG_TMP_OUT}"
while [ "$#" -gt 1 ]
do
@ -48,14 +64,15 @@ while [ "$#" -gt 1 ]
[ ! -f "$file" ] && echo "$ME: Not a valid file: $file" && usage
FILES="$FILES $file"
md5=$(mkhash md5 "$file")
printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> $IMG_OUT
printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> "${IMG_TMP_OUT}"
shift 2
done
[ "$#" -eq 1 ] && echo "$ME: Filename not specified: $1" && usage
mv $IMG_OUT $IMG_OUT.tmp
dd if="$IMG_OUT.tmp" of="$IMG_OUT" bs=65536 conv=sync 2>/dev/null
rm $IMG_OUT.tmp
mv "${IMG_TMP_OUT}" "${IMG_TMP_OUT}".tmp
dd if="${IMG_TMP_OUT}.tmp" of="${IMG_TMP_OUT}" bs=65536 conv=sync 2>/dev/null
rm "${IMG_TMP_OUT}".tmp
cat $FILES >> $IMG_OUT
cat $FILES >> "${IMG_TMP_OUT}"
cp "${IMG_TMP_OUT}" "${IMG_OUT}"