Support generation of partial updates
Add a new minor version kPartialUpdateMinorPayloadVersion for
partial updates. Also, we always treat the partial update as a
delta update in payload consumer, so new update_engine can
perform minor version check correctly.
Conceptually, partial update is indeed a delta update; because we
need to copy | use the untouched partitions. Since the payload for
the partial update doesn't carry old partition info, old update
engines will treat them as full update. So old UE will also fail
the minor version check correctly; because we always expect
kFullPayloadMinorVersion for full updates.
Bug: 157778739
Test: generate & apply partial full|incremental updates, generate
regular updates, unittests pass
Change-Id: I7f8365cf99098269150dd08e028120354944f3c6
diff --git a/scripts/brillo_update_payload b/scripts/brillo_update_payload
index d9c18ff..63b6d24 100755
--- a/scripts/brillo_update_payload
+++ b/scripts/brillo_update_payload
@@ -189,6 +189,9 @@
DEFINE_string disable_fec_computation "" \
"Optional: Disables the on device fec data computation for incremental \
update. This feature is enabled by default."
+ DEFINE_string is_partial_update "" \
+ "Optional: True if the payload is for partial update. i.e. it only updates \
+a subset of partitions on device."
fi
if [[ "${COMMAND}" == "hash" || "${COMMAND}" == "sign" ]]; then
DEFINE_string unsigned_payload "" "Path to the input unsigned payload."
@@ -654,21 +657,33 @@
--new_mapfiles="${new_mapfiles}"
)
+ if [[ "${FLAGS_is_partial_update}" == "true" ]]; then
+ GENERATOR_ARGS+=( --is_partial_update="true" )
+ # Need at least minor version 7 for partial update, so generate with minor
+ # version 7 if we don't have a source image. Let the delta_generator to fail
+ # the other incompatiable minor versions.
+ if [[ -z "${FORCE_MINOR_VERSION}" ]]; then
+ FORCE_MINOR_VERSION="7"
+ fi
+ fi
+
if [[ "${payload_type}" == "delta" ]]; then
# Source image args:
GENERATOR_ARGS+=(
--old_partitions="${old_partitions}"
--old_mapfiles="${old_mapfiles}"
)
- if [[ -n "${FORCE_MINOR_VERSION}" ]]; then
- GENERATOR_ARGS+=( --minor_version="${FORCE_MINOR_VERSION}" )
- fi
if [[ -n "${FLAGS_disable_fec_computation}" ]]; then
GENERATOR_ARGS+=(
--disable_fec_computation="${FLAGS_disable_fec_computation}" )
fi
fi
+ # minor version is set only for delta or partial payload.
+ if [[ -n "${FORCE_MINOR_VERSION}" ]]; then
+ GENERATOR_ARGS+=( --minor_version="${FORCE_MINOR_VERSION}" )
+ fi
+
if [[ -n "${FORCE_MAJOR_VERSION}" ]]; then
GENERATOR_ARGS+=( --major_version="${FORCE_MAJOR_VERSION}" )
fi