build: Update install tools packaging for target-files support

Modifies "build: ota: Support for install tools in /tmp/install" to
support signing steps being split from build steps.

Package install files into target-files INSTALL path
Read from target-files for OTA package creation

Change-Id: I64f919c2a757b5474f6cc5f82bd6c33c2a8b558a

Author: Brint E. Kriebel

core/Makefile

@@ -1462,6 +1462,8 @@ $(BUILT_TARGET_FILES_PACKAGE): \
 	$(hide) mkdir -p $(zip_root)/RECOVERY
 	$(hide) $(call package_files-copy-root, \
 		$(TARGET_RECOVERY_ROOT_OUT),$(zip_root)/RECOVERY/RAMDISK)
+	@# OTA install helpers
+	$(hide) $(call package_files-copy-root, $(OUT)/install, $(zip_root)/INSTALL)
 ifdef INSTALLED_KERNEL_TARGET
 	$(hide) $(ACP) $(INSTALLED_KERNEL_TARGET) $(zip_root)/RECOVERY/kernel
 endif

tools/releasetools/ota_from_target_files

@@ -477,13 +477,12 @@ def GetImage(which, tmpdir, info_dict):
 
 
 def CopyInstallTools(output_zip):
-  oldcwd = os.getcwd()
-  os.chdir(os.getenv('OUT'))
-  for root, subdirs, files in os.walk("install"):
+  install_path = os.path.join(OPTIONS.input_tmp, "INSTALL")
+  for root, subdirs, files in os.walk(install_path):
     for f in files:
-      p = os.path.join(root, f)
-      output_zip.write(p, p)
-  os.chdir(oldcwd)
+      install_source = os.path.join(root, f)
+      install_target = os.path.join("install", os.path.relpath(root, install_path), f)
+      output_zip.write(install_source, install_target)
 
 
 def WriteFullOTAPackage(input_zip, output_zip):