Add the length to the data returned

Since we compute it anyway, better return it along with the result

swh/model/hashutil.py

@@ -125,7 +125,9 @@ def hash_path(path, algorithms=ALGORITHMS, chunk_cb=None):
     """
     length = os.path.getsize(path)
     with open(path, 'rb') as fobj:
-        return hash_file(fobj, length, algorithms, chunk_cb)
+        hash = hash_file(fobj, length, algorithms, chunk_cb)
+    hash['length'] = length
+    return hash
 
 
 def hash_data(data, algorithms=ALGORITHMS):

swh/model/tests/test_git.py

@@ -207,6 +207,7 @@ class GitHashFromScratch(GitHashWalkArborescenceTree):
             os.path.join(self.tmp_root_path, b'sample-folder/empty-folder'): [],                                            # noqa
             os.path.join(self.tmp_root_path, b'sample-folder/bar/barfoo'): [{                                               # noqa
                 'type': git.GitType.BLOB,                                                                                   # noqa
+                'length': 72,
                 'sha256': b'=\xb5\xae\x16\x80U\xbc\xd9:M\x08(]\xc9\x9f\xfe\xe2\x883\x03\xb2?\xac^\xab\x85\x02s\xa8\xeaUF',  # noqa
                 'name': b'another-quote.org',                                                                               # noqa
                 'path': os.path.join(self.tmp_root_path, b'sample-folder/bar/barfoo/another-quote.org'),                    # noqa

swh/model/tests/test_hashutil.py

@@ -92,6 +92,7 @@ class Hashutil(unittest.TestCase):
             f.close()
             hashes = hashutil.hash_path(f.name)
 
+        self.checksums['length'] = len(self.data)
         self.assertEquals(self.checksums, hashes)
 
     @istest