git-fetch: Fix "argument list too long"

If $ls_remote_result was too long,

    git-fetch--tool -s pick-rref "$rref" "$ls_remote_result"

in git-fetch will fail with "argument list too long".

This patch fixes git-fetch--tool and git-fetch by passing
$ls_remote_result via stdin.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-fetch--tool.c

@@ -571,9 +571,13 @@ int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 		return parse_reflist(reflist);
 	}
 	if (!strcmp("pick-rref", argv[1])) {
+		const char *ls_remote_result;
 		if (argc != 4)
 			return error("pick-rref takes 2 args");
-		return pick_rref(sopt, argv[2], argv[3]);
+		ls_remote_result = argv[3];
+		if (!strcmp(ls_remote_result, "-"))
+			ls_remote_result = get_stdin();
+		return pick_rref(sopt, argv[2], ls_remote_result);
 	}
 	if (!strcmp("expand-refs-wildcard", argv[1])) {
 		const char *reflist;

git-fetch.sh

@@ -189,16 +189,17 @@ fetch_all_at_once () {
 			# See if all of what we are going to fetch are
 			# connected to our repository's tips, in which
 			# case we do not have to do any fetch.
-			theirs=$(git-fetch--tool -s pick-rref \
-					"$rref" "$ls_remote_result") &&
+			theirs=$(echo "$ls_remote_result" | \
+				git-fetch--tool -s pick-rref "$rref" "-") &&
 
 			# This will barf when $theirs reach an object that
 			# we do not have in our repository.  Otherwise,
 			# we already have everything the fetch would bring in.
 			git-rev-list --objects $theirs --not --all \
 				>/dev/null 2>/dev/null
 		then
-			git-fetch--tool pick-rref "$rref" "$ls_remote_result"
+			echo "$ls_remote_result" | \
+				git-fetch--tool pick-rref "$rref" "-"
 		else
 			git-fetch-pack --thin $exec $keep $shallow_depth \
 				$quiet $no_progress "$remote" $rref ||
@@ -263,8 +264,8 @@ fetch_per_ref () {
 	  fi
 
 	  # Find $remote_name from ls-remote output.
-	  head=$(git-fetch--tool -s pick-rref \
-			"$remote_name" "$ls_remote_result")
+	  head=$(echo "$ls_remote_result" | \
+		git-fetch--tool -s pick-rref "$remote_name" "-")
 	  expr "z$head" : "z$_x40\$" >/dev/null ||
 		die "No such ref $remote_name at $remote"
 	  echo >&2 "Fetching $remote_name from $remote using $proto"