diff --git a/CleanSpec.mk b/CleanSpec.mk
index fff49b3..dd5c476 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -763,6 +763,12 @@
 # Most of SOONG_HOST_OUT_EXECUTABLES has been moved to HOST_OUT_EXECUTABLES
 $(call add-clean-step, rm -rf $(SOONG_HOST_OUT))
 
+# More of SOONG_HOST_OUT_EXECUTABLES has been moved to HOST_OUT_EXECUTABLES
+$(call add-clean-step, rm -rf $(SOONG_HOST_OUT))
+
+# More of SOONG_HOST_OUT_EXECUTABLES has been moved to HOST_OUT_EXECUTABLES
+$(call add-clean-step, rm -rf $(SOONG_HOST_OUT))
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/base_rules.mk b/core/base_rules.mk
index 300fdda..1464c4b 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -514,12 +514,6 @@
 ###########################################################
 
 my_installed_symlinks :=
-my_default_test_module :=
-ifeq ($(use_testcase_folder),true)
-arch_dir := $($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)
-my_default_test_module := $($(my_prefix)OUT_TESTCASES)/$(LOCAL_MODULE)/$(arch_dir)/$(my_installed_module_stem)
-arch_dir :=
-endif
 
 ifneq (,$(LOCAL_SOONG_INSTALLED_MODULE))
   # Soong already generated the copy rule, but make the installed location depend on the Make
@@ -531,17 +525,15 @@
     $(call declare-0p-target,$(symlink)))
   $(my_all_targets) : | $(LOCAL_SOONG_INSTALL_SYMLINKS)
 else ifneq (true,$(LOCAL_UNINSTALLABLE_MODULE))
-  ifneq ($(LOCAL_INSTALLED_MODULE),$(my_default_test_module))
-    $(LOCAL_INSTALLED_MODULE): PRIVATE_POST_INSTALL_CMD := $(LOCAL_POST_INSTALL_CMD)
-    $(LOCAL_INSTALLED_MODULE): $(LOCAL_BUILT_MODULE)
+  $(LOCAL_INSTALLED_MODULE): PRIVATE_POST_INSTALL_CMD := $(LOCAL_POST_INSTALL_CMD)
+  $(LOCAL_INSTALLED_MODULE): $(LOCAL_BUILT_MODULE)
 	@echo "Install: $@"
-    ifeq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
+  ifeq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
 	$(copy-file-or-link-to-new-target)
-    else
+  else
 	$(copy-file-to-new-target)
-    endif
-	$(PRIVATE_POST_INSTALL_CMD)
   endif
+	$(PRIVATE_POST_INSTALL_CMD)
 
   # Rule to install the module's companion symlinks
   my_installed_symlinks := $(addprefix $(my_module_path)/,$(LOCAL_MODULE_SYMLINKS) $(LOCAL_MODULE_SYMLINKS_$(my_32_64_bit_suffix)))
@@ -739,8 +731,9 @@
 
 # The module itself.
 $(foreach suite, $(LOCAL_COMPATIBILITY_SUITE), \
-  $(eval my_compat_dist_$(suite) := $(foreach dir, $(call compatibility_suite_dirs,$(suite),$(arch_dir)), \
-    $(LOCAL_BUILT_MODULE):$(dir)/$(my_installed_module_stem))) \
+  $(eval my_compat_dist_$(suite) := $(patsubst %:$(LOCAL_INSTALLED_MODULE),$(LOCAL_INSTALLED_MODULE):$(LOCAL_INSTALLED_MODULE),\
+    $(foreach dir, $(call compatibility_suite_dirs,$(suite),$(arch_dir)), \
+      $(LOCAL_BUILT_MODULE):$(dir)/$(my_installed_module_stem)))) \
   $(eval my_compat_dist_config_$(suite) := ))
 
 
diff --git a/core/config.mk b/core/config.mk
index de0a06b..25e351c 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -304,7 +304,7 @@
 endef
 
 # soong_config_append appends to the value of the variable in the given Soong
-# config namespace. If the varabile does not exist, it will be defined. If the
+# config namespace. If the variable does not exist, it will be defined. If the
 # namespace does not  exist, it will be defined.
 # $1 is the namespace, $2 is the variable name, $3 is the value
 define soong_config_append
@@ -312,6 +312,14 @@
 $(eval SOONG_CONFIG_$(strip $1)_$(strip $2):=$(SOONG_CONFIG_$(strip $1)_$(strip $2)) $3)
 endef
 
+# soong_config_append gets to the value of the variable in the given Soong
+# config namespace. If the namespace or variables does not exist, an
+# empty string will be returned.
+# $1 is the namespace, $2 is the variable name
+define soong_config_get
+$(SOONG_CONFIG_$(strip $1)_$(strip $2))
+endef
+
 # Set the extensions used for various packages
 COMMON_PACKAGE_SUFFIX := .zip
 COMMON_JAVA_PACKAGE_SUFFIX := .jar
diff --git a/core/node_fns.mk b/core/node_fns.mk
index 8d20160..2243cd7 100644
--- a/core/node_fns.mk
+++ b/core/node_fns.mk
@@ -208,7 +208,7 @@
 
   $(eval $(1).$(2).inherited := \
       $(call get-inherited-nodes,$(1).$(2),$(3)))
-  $(call _import-nodes-inner,$(1),$($(1).$(2).inherited),$(3))
+  $(call _import-nodes-inner,$(1),$($(1).$(2).inherited),$(3),$(4))
 
   $(call _expand-inherited-values,$(1),$(2),$(3),$(4))
 
diff --git a/core/product_config.rbc b/core/product_config.rbc
index fe6ba7c..24e38b1 100644
--- a/core/product_config.rbc
+++ b/core/product_config.rbc
@@ -321,6 +321,11 @@
         ns[var] += " " + value
 
 
+def _soong_config_get(g, nsname, var):
+    """Gets to the value of the variable in the namespace."""
+    return g.get(_soong_config_namespaces_key, {}).get(nsname, {}).get(var, None)
+
+
 def _abspath(path):
     """Provided for compatibility, to be removed later."""
     return path
@@ -644,6 +649,7 @@
     soong_config_namespace = _soong_config_namespace,
     soong_config_append = _soong_config_append,
     soong_config_set = _soong_config_set,
+    soong_config_get = _soong_config_get,
     abspath = _abspath,
     addprefix = _addprefix,
     addsuffix = _addsuffix,
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index ee06432..dcb5a2e 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -138,13 +138,6 @@
 java-dex: $(LOCAL_SOONG_DEX_JAR)
 
 
-my_built_installed := $(foreach f,$(LOCAL_SOONG_BUILT_INSTALLED),\
-  $(call word-colon,1,$(f)):$(PRODUCT_OUT)$(call word-colon,2,$(f)))
-my_installed := $(call copy-many-files, $(my_built_installed))
-ALL_MODULES.$(my_register_name).INSTALLED += $(my_installed)
-ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(my_built_installed)
-$(my_all_targets): $(my_installed)
-
 # Copy test suite files.
 ifdef LOCAL_COMPATIBILITY_SUITE
 my_apks_to_install := $(foreach f,$(filter %.apk %.idsig,$(LOCAL_SOONG_BUILT_INSTALLED)),$(call word-colon,1,$(f)))
diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index 2c909ac..801a265 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -154,13 +154,7 @@
   endif
 endif  # LOCAL_SOONG_DEX_JAR
 
-my_built_installed := $(foreach f,$(LOCAL_SOONG_BUILT_INSTALLED),\
-  $(call word-colon,1,$(f)):$(PRODUCT_OUT)$(call word-colon,2,$(f)))
-my_installed := $(call copy-many-files, $(my_built_installed))
-ALL_MODULES.$(my_register_name).INSTALLED += $(my_installed)
-ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(my_built_installed)
 ALL_MODULES.$(my_register_name).CLASSES_JAR := $(full_classes_jar)
-$(my_register_name): $(my_installed)
 
 ifdef LOCAL_SOONG_AAR
   ALL_MODULES.$(my_register_name).AAR := $(LOCAL_SOONG_AAR)
diff --git a/envsetup.sh b/envsetup.sh
index 4301d73..1687309 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -1883,16 +1883,6 @@
     fi
 }
 
-# Source necessary setup scripts needed to run the build with Remote Execution.
-function source_rbe() {
-    local T=$(gettop)
-
-    if [[ "x$USE_RBE" != "x" && "$USE_RBE" != "false" ]]; then
-        . $T/build/make/rbesetup.sh --skip-envsetup
-    fi
-}
-
 validate_current_shell
 source_vendorsetup
-source_rbe
 addcompletions
diff --git a/target/product/runtime_libart.mk b/target/product/runtime_libart.mk
index 301605a..43fb8fc 100644
--- a/target/product/runtime_libart.mk
+++ b/target/product/runtime_libart.mk
@@ -61,7 +61,7 @@
   apex_test_module := art-check-release-apex-gen-fakebin
 endif
 
-ifeq (true,$(SOONG_CONFIG_art_module_source_build)
+ifeq (true,$(call soong_config_get,art_module,source_build))
   PRODUCT_HOST_PACKAGES += $(apex_test_module)
 endif
 
diff --git a/tests/run.rbc b/tests/run.rbc
index 3bb9b55..b40d1c6 100644
--- a/tests/run.rbc
+++ b/tests/run.rbc
@@ -94,3 +94,6 @@
 
 assert_eq("S", globals["PLATFORM_VERSION"])
 assert_eq(30, globals["PLATFORM_SDK_VERSION"])
+
+assert_eq("xyz", rblf.soong_config_get(globals, "NS2", "v3"))
+assert_eq(None, rblf.soong_config_get(globals, "NS2", "nonexistant_var"))
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index fc588e4..827aaac 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -100,14 +100,6 @@
 
 python_library_host {
     name: "ota_metadata_proto",
-    version: {
-        py2: {
-            enabled: true,
-        },
-        py3: {
-            enabled: true,
-        },
-    },
     srcs: [
        "ota_metadata.proto",
     ],
@@ -187,29 +179,15 @@
 // Host libraries.
 //
 
-python_defaults {
-    name: "releasetools_library_defaults",
-    version: {
-        py2: {
-            enabled: true,
-        },
-        py3: {
-            enabled: true,
-        },
-    },
-}
-
 python_library_host {
     name: "releasetools_add_img_to_target_files",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_add_img_to_target_files_defaults",
     ],
 }
 
 python_library_host {
     name: "releasetools_apex_utils",
-    defaults: ["releasetools_library_defaults"],
     srcs: [
         "apex_utils.py",
     ],
@@ -223,7 +201,6 @@
 python_library_host {
     name: "releasetools_build_image",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_build_image_defaults",
     ],
 }
@@ -231,7 +208,6 @@
 python_library_host {
     name: "releasetools_build_super_image",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_build_super_image_defaults",
     ],
 }
@@ -239,14 +215,12 @@
 python_library_host {
     name: "releasetools_check_target_files_vintf",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_check_target_files_vintf_defaults",
     ],
 }
 
 python_library_host {
     name: "releasetools_common",
-    defaults: ["releasetools_library_defaults"],
     srcs: [
         "blockimgdiff.py",
         "common.py",
@@ -274,7 +248,6 @@
 python_library_host {
     name: "releasetools_img_from_target_files",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_img_from_target_files_defaults",
     ],
 }
@@ -282,14 +255,12 @@
 python_library_host {
     name: "releasetools_ota_from_target_files",
     defaults: [
-        "releasetools_library_defaults",
         "releasetools_ota_from_target_files_defaults",
     ],
 }
 
 python_library_host {
     name: "releasetools_verity_utils",
-    defaults: ["releasetools_library_defaults"],
     srcs: [
         "verity_utils.py",
     ],
@@ -308,13 +279,8 @@
 python_defaults {
     name: "releasetools_binary_defaults",
     version: {
-        py2: {
-            enabled: true,
-            embedded_launcher: true,
-        },
         py3: {
-            enabled: false,
-            embedded_launcher: false,
+            embedded_launcher: true,
         },
     },
     // TODO (b/140144201) Build imgdiff from releasetools_common
@@ -443,7 +409,6 @@
     name: "releasetools_find_shareduid_violation",
     defaults: [
         "releasetools_find_shareduid_violation_defaults",
-        "releasetools_library_defaults",
     ],
 }
 
@@ -628,39 +593,9 @@
     name: "releasetools_test",
     defaults: ["releasetools_test_defaults"],
     main: "test_utils.py",
-    version: {
-        py2: {
-            enabled: true,
-            // When using embedded launcher, atest will try (but may fail) to load libc++.so from
-            // host, because the test executable won't be able to find the needed libs via its
-            // runpath.
-            embedded_launcher: false,
-        },
-        py3: {
-            enabled: false,
-            embedded_launcher: false,
-        },
-    },
-    test_options: {
-        unit_test: true,
-    },
-}
-
-python_test_host {
-    name: "releasetools_py3_test",
-    defaults: ["releasetools_test_defaults"],
-    main: "test_utils.py",
-    test_suites: ["general-tests"],
-    version: {
-        py2: {
-            enabled: false,
-            embedded_launcher: false,
-        },
-        py3: {
-            enabled: true,
-            embedded_launcher: false,
-        },
-    },
+    // Don't use embedded_launcher, atest will try (but may fail) to load libc++.so from
+    // host, because the test executable won't be able to find the needed libs via its
+    // runpath.
     test_options: {
         unit_test: true,
     },
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index ec703ab..e99152a 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1191,6 +1191,8 @@
     care_map_list = [x for x in ["care_map.pb", "care_map.txt"] if
                      "META/" + x in target_zip.namelist()]
 
+    # TODO(b/205541521) remove the workaround after root cause is fixed.
+    care_map_list = []
     # Adds care_map if either the protobuf format or the plain text one exists.
     if care_map_list:
       care_map_name = care_map_list[0]
@@ -1331,49 +1333,49 @@
     return True
 
   args = common.ParseOptions(argv, __doc__,
-                                             extra_opts="b:k:i:d:e:t:2o:",
-                                             extra_long_opts=[
-                                                 "package_key=",
-                                                 "incremental_from=",
-                                                 "full_radio",
-                                                 "full_bootloader",
-                                                 "wipe_user_data",
-                                                 "downgrade",
-                                                 "override_timestamp",
-                                                 "extra_script=",
-                                                 "worker_threads=",
-                                                 "two_step",
-                                                 "include_secondary",
-                                                 "no_signing",
-                                                 "block",
-                                                 "binary=",
-                                                 "oem_settings=",
-                                                 "oem_no_mount",
-                                                 "verify",
-                                                 "stash_threshold=",
-                                                 "log_diff=",
-                                                 "payload_signer=",
-                                                 "payload_signer_args=",
-                                                 "payload_signer_maximum_signature_size=",
-                                                 "payload_signer_key_size=",
-                                                 "extracted_input_target_files=",
-                                                 "skip_postinstall",
-                                                 "retrofit_dynamic_partitions",
-                                                 "skip_compatibility_check",
-                                                 "output_metadata_path=",
-                                                 "disable_fec_computation",
-                                                 "disable_verity_computation",
-                                                 "force_non_ab",
-                                                 "boot_variable_file=",
-                                                 "partial=",
-                                                 "custom_image=",
-                                                 "disable_vabc",
-                                                 "spl_downgrade",
-                                                 "vabc_downgrade",
-                                                 "enable_vabc_xor=",
-                                                 "force_minor_version=",
-                                                 "compressor_types=",
-                                             ], extra_option_handler=option_handler)
+                             extra_opts="b:k:i:d:e:t:2o:",
+                             extra_long_opts=[
+                                 "package_key=",
+                                 "incremental_from=",
+                                 "full_radio",
+                                 "full_bootloader",
+                                 "wipe_user_data",
+                                 "downgrade",
+                                 "override_timestamp",
+                                 "extra_script=",
+                                 "worker_threads=",
+                                 "two_step",
+                                 "include_secondary",
+                                 "no_signing",
+                                 "block",
+                                 "binary=",
+                                 "oem_settings=",
+                                 "oem_no_mount",
+                                 "verify",
+                                 "stash_threshold=",
+                                 "log_diff=",
+                                 "payload_signer=",
+                                 "payload_signer_args=",
+                                 "payload_signer_maximum_signature_size=",
+                                 "payload_signer_key_size=",
+                                 "extracted_input_target_files=",
+                                 "skip_postinstall",
+                                 "retrofit_dynamic_partitions",
+                                 "skip_compatibility_check",
+                                 "output_metadata_path=",
+                                 "disable_fec_computation",
+                                 "disable_verity_computation",
+                                 "force_non_ab",
+                                 "boot_variable_file=",
+                                 "partial=",
+                                 "custom_image=",
+                                 "disable_vabc",
+                                 "spl_downgrade",
+                                 "vabc_downgrade",
+                                 "enable_vabc_xor=",
+                                 "force_minor_version=",
+                                 "compressor_types=",
+                             ], extra_option_handler=option_handler)
 
   if len(args) != 2:
     common.Usage(__doc__)
@@ -1473,13 +1475,18 @@
           "build/make/target/product/security/testkey")
     # Get signing keys
     OPTIONS.key_passwords = common.GetKeyPasswords([OPTIONS.package_key])
-    private_key_path = OPTIONS.package_key + OPTIONS.private_key_suffix
-    if not os.path.exists(private_key_path):
-      raise common.ExternalError(
-          "Private key {} doesn't exist. Make sure you passed the"
-          " correct key path through -k option".format(
-              private_key_path)
-      )
+
+    # Only check for existence of key file if using the default signer.
+    # Because the custom signer might not need the key file AT all.
+    # b/191704641
+    if not OPTIONS.signapk_path:
+      private_key_path = OPTIONS.package_key + OPTIONS.private_key_suffix
+      if not os.path.exists(private_key_path):
+        raise common.ExternalError(
+            "Private key {} doesn't exist. Make sure you passed the"
+            " correct key path through -k option".format(
+                private_key_path)
+        )
 
   if OPTIONS.source_info_dict:
     source_build_prop = OPTIONS.source_info_dict["build.prop"]
@@ -1531,8 +1538,5 @@
   try:
     common.CloseInheritedPipes()
     main(sys.argv[1:])
-  except common.ExternalError:
-    logger.exception("\n   ERROR:\n")
-    sys.exit(1)
   finally:
     common.Cleanup()
diff --git a/tools/releasetools/target_files_diff.py b/tools/releasetools/target_files_diff.py
index 4402c8d..fa94c5b 100755
--- a/tools/releasetools/target_files_diff.py
+++ b/tools/releasetools/target_files_diff.py
@@ -82,7 +82,7 @@
         skip = True
         break
     if not skip:
-      new.write(line)
+      new.write(line.encode())
 
 
 def trim_install_recovery(original, new):
@@ -91,7 +91,7 @@
   partition.
   """
   for line in original:
-    new.write(re.sub(r'[0-9a-f]{40}', '0'*40, line))
+    new.write(re.sub(r'[0-9a-f]{40}', '0'*40, line).encode())
 
 def sort_file(original, new):
   """
@@ -101,7 +101,7 @@
   lines = original.readlines()
   lines.sort()
   for line in lines:
-    new.write(line)
+    new.write(line.encode())
 
 # Map files to the functions that will modify them for diffing
 REWRITE_RULES = {
@@ -148,7 +148,7 @@
       if stdout == 'Binary files %s and %s differ' % (f1, f2):
         print("%s: Binary files differ" % name, file=out_file)
       else:
-        for line in stdout.strip().split('\n'):
+        for line in stdout.strip().split(b'\n'):
           print("%s: %s" % (name, line), file=out_file)
 
 def recursiveDiff(prefix, dir1, dir2, out_file):