Pack META/ab_partitions.txt when using the A/B OTA updater.

The list of A/B partitions updated is product-specific. Normally you
would update boot and system, but the product could require to update
other partitions during a system update. This patch packages the list
of A/B partitions configured to be updated when using the A/B updater.
The list can be set in the product makefile by setting the make
variable UPDATE_AB_PARTITIONS.

Bug: 24387863
Test: `make dist` creates the META/ab_partitions.txt in the target_files.zip

Change-Id: I4226ab05c7c7cd74721b06f1da64c6cf4d0e52ac
(cherry picked from commit 8925d334c3d9932526242ad78ec7a0c23627c3a8)

diff --git a/core/Makefile b/core/Makefile
index 8e01480..4f117b8 100644 (file)
--- a/core/Makefile
+++ b/core/Makefile
@@ -1557,6 +1557,9 @@ endif
 ifeq ($(AB_OTA_UPDATER),true)
        @# When using the A/B updater, include the updater config files in the zip.
        $(hide) $(ACP) $(TOPDIR)system/update_engine/update_engine.conf $(zip_root)/META/update_engine_config.txt
+       $(hide) for part in $(UPDATE_AB_PARTITIONS); do \
+         echo "$${part}" >> $(zip_root)/META/ab_partitions.txt; \
+       done
 endif
        @# Zip everything up, preserving symlinks
        $(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)