object-file: get rid of the_repository in read_loose_object()

The function `read_loose_object()` takes a path to an object file and
tries to parse it. As such, the function does not depend on any specific
object database but instead acts as an ODB-independent way to read a
specific file. As such, all it needs as input is a repository so that we
can derive repo settings and the hash algorithm.

That repository isn't passed in as a parameter though, as we implicitly
depend on the global `the_repository`. Refactor the function so that we
pass in the repository as a parameter.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

builtin/fsck.c

@@ -633,7 +633,7 @@ static int fsck_loose(const struct object_id *oid, const char *path,
 	oi.sizep = &size;
 	oi.typep = &type;
 
-	if (read_loose_object(path, oid, &real_oid, &contents, &oi) < 0) {
+	if (read_loose_object(the_repository, path, oid, &real_oid, &contents, &oi) < 0) {
 		if (contents && !oideq(&real_oid, oid))
 			err = error(_("%s: hash-path mismatch, found at: %s"),
 				    oid_to_hex(&real_oid), path);

object-file.c

@@ -1535,7 +1535,8 @@ static int check_stream_oid(git_zstream *stream,
 	return 0;
 }
 
-int read_loose_object(const char *path,
+int read_loose_object(struct repository *repo,
+		      const char *path,
 		      const struct object_id *expected_oid,
 		      struct object_id *real_oid,
 		      void **contents,
@@ -1574,17 +1575,17 @@ int read_loose_object(const char *path,
 	}
 
 	if (*oi->typep == OBJ_BLOB &&
-	    *size > repo_settings_get_big_file_threshold(the_repository)) {
+	    *size > repo_settings_get_big_file_threshold(repo)) {
 		if (check_stream_oid(&stream, hdr, *size, path, expected_oid,
-				     the_repository->hash_algo) < 0)
+				     repo->hash_algo) < 0)
 			goto out_inflate;
 	} else {
 		*contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
 		if (!*contents) {
 			error(_("unable to unpack contents of %s"), path);
 			goto out_inflate;
 		}
-		hash_object_file(the_repository->hash_algo,
+		hash_object_file(repo->hash_algo,
 				 *contents, *size,
 				 *oi->typep, real_oid);
 		if (!oideq(expected_oid, real_oid))

object-file.h

@@ -210,7 +210,8 @@ int check_and_freshen_file(const char *fn, int freshen);
  *
  * Returns 0 on success, negative on error (details may be written to stderr).
  */
-int read_loose_object(const char *path,
+int read_loose_object(struct repository *repo,
+		      const char *path,
 		      const struct object_id *expected_oid,
 		      struct object_id *real_oid,
 		      void **contents,