add --superproject-hash for repo status

If the option is given, repo status prints out the superproject hash

Change-Id: I5d1c709518d76d777a7f07c4c774569773c5a265
Bug: 416589884

git_superproject.py

@@ -129,6 +129,30 @@ class Superproject:
         """Set the _print_messages attribute."""
         self._print_messages = value
 
+    @property
+    def commit_id(self):
+        """Returns the commit ID of the superproject checkout."""
+        cmd = ["rev-parse", self.revision]
+        p = GitCommand(
+            None, # project
+            cmd,
+            gitdir=self._work_git,
+            bare=True,
+            capture_stdout=True,
+            capture_stderr=True,
+          )
+        retval = p.Wait()
+        if retval == 0:
+            data = p.stdout
+        else:
+            self._LogWarning(
+                "git rev-parse call failed, command: git {}, "
+                "return code: {}, stderr: {}",
+                cmd,
+                p.stdwerr,
+            )
+        return data
+
     @property
     def project_commit_ids(self):
         """Returns a dictionary of projects and their commit ids."""

subcmds/status.py

@@ -87,6 +87,12 @@ the following meanings:
             help="include objects in working directory outside of repo "
             "projects",
         )
+        p.add_option(
+            "--superproject-hash",
+            dest="superproject_hash",
+            action="store_true",
+            help="print the superproject hash",
+        )
 
     @classmethod
     def _StatusHelper(cls, quiet, local, project_idx):
@@ -132,6 +138,12 @@ the following meanings:
             outstring.append("".join([status_header, item, "/"]))
 
     def Execute(self, opt, args):
+        if opt.superproject_hash:
+            sp = self.manifest.superproject
+            shash = sp.commit_id if sp else "None"
+            print("Superproject Hash:", shash)
+            return
+
         all_projects = self.GetProjects(
             args, all_manifests=not opt.this_manifest_only
         )