Adds repo.is_valid_object() check.

git/repo/base.py

@@ -3,12 +3,13 @@
 #
 # This module is part of GitPython and is released under
 # the BSD License: http://www.opensource.org/licenses/bsd-license.php
-
 import logging
 import os
 import re
 import warnings
 
+from gitdb.exc import BadObject
+
 from git.cmd import (
     Git,
     handle_process_output
@@ -618,6 +619,23 @@ def is_ancestor(self, ancestor_rev: 'Commit', rev: 'Commit') -> bool:
             raise
         return True
 
+    def is_valid_object(self, sha: str, object_type: str = None) -> bool:
+        try:
+            complete_sha = self.odb.partial_to_complete_sha_hex(sha)
+            object_info = self.odb.info(complete_sha)
+            if object_type:
+                if object_info.type == object_type.encode():
+                    return True
+                else:
+                    log.debug("Commit hash points to an object of type '%s'. Requested were objects of type '%s'",
+                              object_info.type.decode(), object_type)
+                    return False
+            else:
+                return True
+        except BadObject:
+            log.debug("Commit hash is invalid.")
+            return False
+
     def _get_daemon_export(self) -> bool:
         if self.git_dir:
             filename = osp.join(self.git_dir, self.DAEMON_EXPORT_FILE)

test/test_repo.py

@@ -989,6 +989,34 @@ def test_is_ancestor(self):
         for i, j in itertools.permutations([c1, 'ffffff', ''], r=2):
             self.assertRaises(GitCommandError, repo.is_ancestor, i, j)
 
+    def test_is_valid_object(self):
+        repo = self.rorepo
+        commit_sha = 'f6aa8d1'
+        blob_sha = '1fbe3e4375'
+        tree_sha = '960b40fe36'
+        tag_sha = '42c2f60c43'
+
+        # Check for valid objects
+        self.assertTrue(repo.is_valid_object(commit_sha))
+        self.assertTrue(repo.is_valid_object(blob_sha))
+        self.assertTrue(repo.is_valid_object(tree_sha))
+        self.assertTrue(repo.is_valid_object(tag_sha))
+
+        # Check for valid objects of specific type
+        self.assertTrue(repo.is_valid_object(commit_sha, 'commit'))
+        self.assertTrue(repo.is_valid_object(blob_sha, 'blob'))
+        self.assertTrue(repo.is_valid_object(tree_sha, 'tree'))
+        self.assertTrue(repo.is_valid_object(tag_sha, 'tag'))
+
+        # Check for invalid objects
+        self.assertFalse(repo.is_valid_object(b'1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a', 'blob'))
+
+        # Check for invalid objects of specific type
+        self.assertFalse(repo.is_valid_object(commit_sha, 'blob'))
+        self.assertFalse(repo.is_valid_object(blob_sha, 'commit'))
+        self.assertFalse(repo.is_valid_object(tree_sha, 'commit'))
+        self.assertFalse(repo.is_valid_object(tag_sha, 'commit'))
+
     @with_rw_directory
     def test_git_work_tree_dotgit(self, rw_dir):
         """Check that we find .git as a worktree file and find the worktree