Merge branch 'jk/remote-helper-object-format-option-fix'

The implementation and documentation of "object-format" option
exchange between the Git itself and its remote helpers did not
quite match, which has been corrected.

* jk/remote-helper-object-format-option-fix:
  transport-helper: send "true" value for object-format option
  transport-helper: drop "object-format <algo>" option
  transport-helper: use write helpers more consistently

Author: gitster

Documentation/gitremote-helpers.txt

@@ -542,13 +542,10 @@ set by Git if the remote helper has the 'option' capability.
 	transaction.  If successful, all refs will be updated, or none will.  If the
 	remote side does not support this capability, the push will fail.
 
-'option object-format' {'true'|algorithm}::
-	If 'true', indicate that the caller wants hash algorithm information
+'option object-format true'::
+	Indicate that the caller wants hash algorithm information
 	to be passed back from the remote.  This mode is used when fetching
 	refs.
-+
-If set to an algorithm, indicate that the caller wants to interact with
-the remote side using that algorithm.
 
 SEE ALSO
 --------

remote-curl.c

@@ -211,14 +211,9 @@ static int set_option(const char *name, const char *value)
 		options.filter = xstrdup(value);
 		return 0;
 	} else if (!strcmp(name, "object-format")) {
-		int algo;
 		options.object_format = 1;
-		if (strcmp(value, "true")) {
-			algo = hash_algo_by_name(value);
-			if (algo == GIT_HASH_UNKNOWN)
-				die("unknown object format '%s'", value);
-			options.hash_algo = &hash_algos[algo];
-		}
+		if (strcmp(value, "true"))
+			die(_("unknown value for object-format: %s"), value);
 		return 0;
 	} else {
 		return 1 /* unsupported */;

t/t5801/git-remote-testgit

@@ -30,6 +30,7 @@ GIT_DIR="$url/.git"
 export GIT_DIR
 
 force=
+object_format=
 
 mkdir -p "$dir"
 
@@ -61,7 +62,8 @@ do
 		echo
 		;;
 	list)
-		echo ":object-format $(git rev-parse --show-object-format=storage)"
+		test -n "$object_format" &&
+			echo ":object-format $(git rev-parse --show-object-format=storage)"
 		git for-each-ref --format='? %(refname)' 'refs/heads/' 'refs/tags/'
 		head=$(git symbolic-ref HEAD)
 		echo "@$head HEAD"

transport-helper.c

@@ -1210,16 +1210,13 @@ static struct ref *get_refs_list_using_list(struct transport *transport,
 	data->get_refs_list_called = 1;
 	helper = get_helper(transport);
 
-	if (data->object_format) {
-		write_str_in_full(helper->in, "option object-format\n");
-		if (recvline(data, &buf) || strcmp(buf.buf, "ok"))
-			exit(128);
-	}
+	if (data->object_format)
+		set_helper_option(transport, "object-format", "true");
 
 	if (data->push && for_push)
-		write_str_in_full(helper->in, "list for-push\n");
+		write_constant(helper->in, "list for-push\n");
 	else
-		write_str_in_full(helper->in, "list\n");
+		write_constant(helper->in, "list\n");
 
 	while (1) {
 		char *eov, *eon;