remote: die on config error when manipulating remotes

When manipulating remotes we try to set various configuration
values without checking if the values were persisted correctly,
possibly leaving the remote in an inconsistent state.

Fix this issue by dying early and notifying the user about the
error.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/remote.c

@@ -197,8 +197,7 @@ static int add(int argc, const char **argv)
 		die(_("'%s' is not a valid remote name"), name);
 
 	strbuf_addf(&buf, "remote.%s.url", name);
-	if (git_config_set(buf.buf, url))
-		return 1;
+	git_config_set_or_die(buf.buf, url);
 
 	if (!mirror || mirror & MIRROR_FETCH) {
 		strbuf_reset(&buf);
@@ -214,16 +213,14 @@ static int add(int argc, const char **argv)
 	if (mirror & MIRROR_PUSH) {
 		strbuf_reset(&buf);
 		strbuf_addf(&buf, "remote.%s.mirror", name);
-		if (git_config_set(buf.buf, "true"))
-			return 1;
+		git_config_set_or_die(buf.buf, "true");
 	}
 
 	if (fetch_tags != TAGS_DEFAULT) {
 		strbuf_reset(&buf);
 		strbuf_addf(&buf, "remote.%s.tagopt", name);
-		if (git_config_set(buf.buf,
-			fetch_tags == TAGS_SET ? "--tags" : "--no-tags"))
-			return 1;
+		git_config_set_or_die(buf.buf,
+				      fetch_tags == TAGS_SET ? "--tags" : "--no-tags");
 	}
 
 	if (fetch && fetch_remote(name))
@@ -589,25 +586,20 @@ static int migrate_file(struct remote *remote)
 
 	strbuf_addf(&buf, "remote.%s.url", remote->name);
 	for (i = 0; i < remote->url_nr; i++)
-		if (git_config_set_multivar(buf.buf, remote->url[i], "^$", 0))
-			return error(_("Could not append '%s' to '%s'"),
-					remote->url[i], buf.buf);
+		git_config_set_multivar_or_die(buf.buf, remote->url[i], "^$", 0);
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.push", remote->name);
 	for (i = 0; i < remote->push_refspec_nr; i++)
-		if (git_config_set_multivar(buf.buf, remote->push_refspec[i], "^$", 0))
-			return error(_("Could not append '%s' to '%s'"),
-					remote->push_refspec[i], buf.buf);
+		git_config_set_multivar_or_die(buf.buf, remote->push_refspec[i], "^$", 0);
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.fetch", remote->name);
 	for (i = 0; i < remote->fetch_refspec_nr; i++)
-		if (git_config_set_multivar(buf.buf, remote->fetch_refspec[i], "^$", 0))
-			return error(_("Could not append '%s' to '%s'"),
-					remote->fetch_refspec[i], buf.buf);
+		git_config_set_multivar_or_die(buf.buf, remote->fetch_refspec[i], "^$", 0);
 	if (remote->origin == REMOTE_REMOTES)
 		unlink_or_warn(git_path("remotes/%s", remote->name));
 	else if (remote->origin == REMOTE_BRANCHES)
 		unlink_or_warn(git_path("branches/%s", remote->name));
+
 	return 0;
 }
 
@@ -654,8 +646,7 @@ static int mv(int argc, const char **argv)
 
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.fetch", rename.new);
-	if (git_config_set_multivar(buf.buf, NULL, NULL, 1))
-		return error(_("Could not remove config section '%s'"), buf.buf);
+	git_config_set_multivar_or_die(buf.buf, NULL, NULL, 1);
 	strbuf_addf(&old_remote_context, ":refs/remotes/%s/", rename.old);
 	for (i = 0; i < oldremote->fetch_refspec_nr; i++) {
 		char *ptr;
@@ -675,8 +666,7 @@ static int mv(int argc, const char **argv)
 				  "\tPlease update the configuration manually if necessary."),
 				buf2.buf);
 
-		if (git_config_set_multivar(buf.buf, buf2.buf, "^$", 0))
-			return error(_("Could not append '%s'"), buf.buf);
+		git_config_set_multivar_or_die(buf.buf, buf2.buf, "^$", 0);
 	}
 
 	read_branches();
@@ -686,9 +676,7 @@ static int mv(int argc, const char **argv)
 		if (info->remote_name && !strcmp(info->remote_name, rename.old)) {
 			strbuf_reset(&buf);
 			strbuf_addf(&buf, "branch.%s.remote", item->string);
-			if (git_config_set(buf.buf, rename.new)) {
-				return error(_("Could not set '%s'"), buf.buf);
-			}
+			git_config_set_or_die(buf.buf, rename.new);
 		}
 	}
 
@@ -786,10 +774,7 @@ static int rm(int argc, const char **argv)
 				strbuf_reset(&buf);
 				strbuf_addf(&buf, "branch.%s.%s",
 						item->string, *k);
-				if (git_config_set(buf.buf, NULL)) {
-					strbuf_release(&buf);
-					return -1;
-				}
+				git_config_set_or_die(buf.buf, NULL);
 			}
 		}
 	}