Add --payload_only flag to apexer

The flag instructs apexer to output only the payload instead of the
complete apex. The payload is signed.

The CL also contains new test to ensure the payload only output from
apexer is same as what we get when we unzip an apex.

Bug: 149993331
Test: atest --host apexer_test
Change-Id: I545fcd6e84ea1eb7f55638ca51ff239912758930

1 files changed, 11 insertions, 0 deletions

diff --git a/apexer/apexer.py b/apexer/apexer.py
index aec0a3e..bbd2d43 100644
--- a/apexer/apexer.py
+++ b/apexer/apexer.py
@@ -154,6 +154,11 @@ def ParseArgs(argv):
       '--build_info',
       required=False,
       help='Build information file to be used for default values.')
+  parser.add_argument(
+      '--payload_only',
+      action='store_true',
+      help='Outputs the payload image/zip only.'
+  )
   return parser.parse_args(argv)
 
 
@@ -541,6 +546,12 @@ def CreateApex(args, work_dir):
     cmd.extend(['-D', manifests_dir])
     RunCommand(cmd, args.verbose)
 
+  if args.payload_only:
+    shutil.copyfile(img_file, args.output)
+    if (args.verbose):
+      print('Created (payload only) ' + args.output)
+    return True
+
   # package the image file and APEX manifest as an APK.
   # The AndroidManifest file is automatically generated if not given.
   android_manifest_file = os.path.join(work_dir, 'AndroidManifest.xml')