Check if an installed file exists and report error if not.

So far there is only one case happened in b/277039235 that an installed file in that product is moved to another directory in LOCAL_POST_INSTALL_CMD. The team agreed to convert to Android.bp, but better to add a check and report the error.

Bug: 277039235
Test: m sbom
Test: build/soong/tests/sbom_test.sh
Change-Id: I9a2302ced6dd605e60e54c49a8778426444dcc4f
diff --git a/tools/generate-sbom.py b/tools/generate-sbom.py
index eae7945..c22175c 100755
--- a/tools/generate-sbom.py
+++ b/tools/generate-sbom.py
@@ -87,6 +87,7 @@
 ISSUE_NO_METADATA_FILE = 'No METADATA file found for installed file:'
 ISSUE_METADATA_FILE_INCOMPLETE = 'METADATA file incomplete:'
 ISSUE_UNKNOWN_SECURITY_TAG_TYPE = 'Unknown security tag type:'
+ISSUE_INSTALLED_FILE_NOT_EXIST = 'Non-exist installed files:'
 INFO_METADATA_FOUND_FOR_PACKAGE = 'METADATA file found for packages:'
 
 
@@ -597,11 +598,12 @@
 
   # Report on some issues and information
   report = {
-      ISSUE_NO_METADATA: [],
-      ISSUE_NO_METADATA_FILE: [],
-      ISSUE_METADATA_FILE_INCOMPLETE: [],
-      ISSUE_UNKNOWN_SECURITY_TAG_TYPE: [],
-      INFO_METADATA_FOUND_FOR_PACKAGE: []
+    ISSUE_NO_METADATA: [],
+    ISSUE_NO_METADATA_FILE: [],
+    ISSUE_METADATA_FILE_INCOMPLETE: [],
+    ISSUE_UNKNOWN_SECURITY_TAG_TYPE: [],
+    ISSUE_INSTALLED_FILE_NOT_EXIST: [],
+    INFO_METADATA_FOUND_FOR_PACKAGE: [],
   }
 
   # Scan the metadata in CSV file and create the corresponding package and file records in SPDX
@@ -619,6 +621,9 @@
 
       if not installed_file_has_metadata(installed_file_metadata, report):
         continue
+      if not os.path.isfile(installed_file):
+        report[ISSUE_INSTALLED_FILE_NOT_EXIST].append(installed_file)
+        continue
 
       file_id = new_file_id(installed_file)
       product_files.append(new_file_record(file_id, installed_file, checksum(installed_file)))