Moving /odm/build.prop to /odm/etc/buid.prop

In device root directory, we have the following symlinks:
  - /odm/app -> /vendor/odm/app
  - /odm/bin -> /vendor/odm/bin
  - /odm/etc -> /vendor/odm/etc
  ...

This allows the Generic System Image (GSI) to be used on both devices:
  1) Has a physical odm partition, where those symlink will be hidden
     when /odm is used as the mount point
  2) Has no physical odm partition and fallback to /vendor/odm/.

We can't just have the symlink /odm -> /vendor/odm, because the former
devices won't have /vendor/odm directory, which leads to mount failure
when the mount point /odm is resolved to /vendor/odm.

The existing /vendor/odm/build.prop won't be loaded in the latter
devices, because there is no symlink:
    - /odm/build.prop -> /vendor/odm/build.prop.

Note that init blocks reading through direct symlinks (O_NOFOLLOW) so
the above symlink won't work either. This CL moves the odm build.prop
to /odm/etc/build.prop for init to load it (symlinks in earlier
components of the path will still be followed by O_NOFOLLOW).

Bug: 132128501
Test: boot a device and checks /odm/etc/build.prop is loaded
Test: make dist with an odm.img, checks $OUT/odm/etc/build.prop is loaded
Change-Id: I6f88763db755c9ec6068bfdd9cee81c19d72e9d7
Merged-In: I6f88763db755c9ec6068bfdd9cee81c19d72e9d7
(cherry picked from commit 6c62884000)

CleanSpec.mk

@@ -635,6 +635,10 @@ $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib*/libjavacrypto.so)
 # Clean up old location of soft OMX plugins
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib*/libstagefright_soft*)
 
+# Move odm build.prop to /odm/etc/.
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/odm/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/vendor/odm/build.prop)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************

core/Makefile

@@ -567,7 +567,7 @@ endif  # BOARD_USES_PRODUCTIMAGE
 
 # ----------------------------------------------------------------
 # odm build.prop
-INSTALLED_ODM_BUILD_PROP_TARGET := $(TARGET_OUT_ODM)/build.prop
+INSTALLED_ODM_BUILD_PROP_TARGET := $(TARGET_OUT_ODM)/etc/build.prop
 ALL_DEFAULT_INSTALLED_MODULES += $(INSTALLED_ODM_BUILD_PROP_TARGET)
 
 FINAL_ODM_BUILD_PROPERTIES += \

tools/releasetools/common.py

@@ -415,8 +415,14 @@ def LoadInfoDict(input_file, repacking=False):
   # Tries to load the build props for all partitions with care_map, including
   # system and vendor.
   for partition in PARTITIONS_WITH_CARE_MAP:
-    d["{}.build.prop".format(partition)] = LoadBuildProp(
+    partition_prop = "{}.build.prop".format(partition)
+    d[partition_prop] = LoadBuildProp(
         read_helper, "{}/build.prop".format(partition.upper()))
+    # Some partition might use /<partition>/etc/build.prop as the new path.
+    # TODO: try new path first when majority of them switch to the new path.
+    if not d[partition_prop]:
+      d[partition_prop] = LoadBuildProp(
+          read_helper, "{}/etc/build.prop".format(partition.upper()))
   d["build.prop"] = d["system.build.prop"]
 
   # Set up the salt (based on fingerprint or thumbprint) that will be used when

tools/releasetools/sign_target_files_apks.py

@@ -468,8 +468,10 @@ def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
     elif filename in ("SYSTEM/build.prop",
                       "VENDOR/build.prop",
                       "SYSTEM/vendor/build.prop",
-                      "ODM/build.prop",
-                      "VENDOR/odm/build.prop",
+                      "ODM/build.prop",  # legacy
+                      "ODM/etc/build.prop",
+                      "VENDOR/odm/build.prop",  # legacy
+                      "VENDOR/odm/etc/build.prop",
                       "PRODUCT/build.prop",
                       "SYSTEM/product/build.prop",
                       "PRODUCT_SERVICES/build.prop",