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New Full AU Format w/ support for kernel partition.

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The old format was: gzip(root filesystem). The new format is:
gzip(kernel parition length + kernel partition + root filesystem). The
length is 8 bytes (uint64 big endian).

This CL fixes the updater and the update generator to support the new
format.

Review URL: http://codereview.chromium.org/1520028
This commit is contained in:
Andrew de los Reyes 2010-04-09 16:07:37 -07:00
parent 96e2b09b24
commit 8d94f49f0d
1 changed files with 43 additions and 12 deletions
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55
mk_memento_images.sh
View File

@ -10,28 +10,60 @@
set -e
if [ -z "$1" ]
then
echo "usage: $0 path/to/rootfs.image"
if [ -z "$2" -o -z "$1" ]; then
echo "usage: $0 path/to/kernel_partition_img path/to/rootfs_partition_img"
exit 1
fi
if [ $(whoami) = "root" ]
then
if [ $(whoami) = "root" ]; then
echo "running $0 as root which is unneccessary"
fi
KPART="$1"
ROOT_PART="$2"
KPART_SIZE=$(stat -c%s "$KPART")
# Sanity check size.
if [ "$KPART_SIZE" -gt $((16 * 1024 * 1024)) ]; then
echo "Kernel partition size ($KPART_SIZE bytes) greater than 16 MiB."
echo "That's too big."
exit 1
fi
FINAL_OUT_FILE=$(dirname "$1")/update.gz
UNCOMPRESSED_OUT_FILE="$FINAL_OUT_FILE.uncompressed"
ORIGINAL_LABEL=$(/sbin/e2label "$1")
# First, write size of kernel partition in big endian as uint64 to out file
# printf converts it to a number like 00000000003d0900. sed converts it to:
# \\x00\\x00\\x00\\x00\\x00\\x3d\\x09\\x00, then xargs converts it to binary
# with echo.
printf %016x "$KPART_SIZE" | \
sed 's/\([0-9a-f][0-9a-f]\)/\\\\x\1/g' | \
xargs echo -ne > "$UNCOMPRESSED_OUT_FILE"
# copy original over to the new file
cp "$1" "$UNCOMPRESSED_OUT_FILE"
# Next, write kernel partition to the out file
cat "$KPART" >> "$UNCOMPRESSED_OUT_FILE"
# Fix up the file system label. We prefix with 'A'
# Sanity check size of output file now
if [ $(stat -c%s "$UNCOMPRESSED_OUT_FILE") -ne $((8 + $KPART_SIZE)) ]; then
echo "Kernel partition changed size during image generation. Aborting."
exit 1
fi
# Copy rootfs aside
TMP_ROOTFS=$(mktemp)
cp "$ROOT_PART" "$TMP_ROOTFS"
ORIGINAL_LABEL=$(/sbin/e2label "$TMP_ROOTFS")
NEW_LABEL="A${ORIGINAL_LABEL}"
/sbin/tune2fs -L "$NEW_LABEL" "$UNCOMPRESSED_OUT_FILE"
/sbin/tune2fs -L "$NEW_LABEL" "$TMP_ROOTFS"
# TODO(adlr): Sign TMP_ROOTFS w/ OS vendor's private key
# Put rootfs into the out file
cat "$TMP_ROOTFS" >> "$UNCOMPRESSED_OUT_FILE"
rm "$TMP_ROOTFS"
# compress and hash
CS_AND_RET_CODES=$(gzip -c "$UNCOMPRESSED_OUT_FILE" | \
@ -43,8 +75,7 @@ set -- $CS_AND_RET_CODES
CALC_CS="$1"
shift
RET_CODES="$@"
if [ "$RET_CODES" != "$EXPECTED_RET_CODES" ]
then
if [ "$RET_CODES" != "$EXPECTED_RET_CODES" ]; then
echo compression/hash failed. $RET_CODES
exit 1
fi