rebase: add a config option to default to --reschedule-failed-exec

It would be cumbersome to type out that option all the time, so let's
offer the convenience of a config setting: rebase.rescheduleFailedExec.

Besides, this opens the door to changing the default in a future version
of Git: it does make some sense to reschedule failed `exec` commands by
default (and if we could go back in time when the `exec` command was
invented, we probably would change that default right from the start).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/rebase.txt

@@ -64,3 +64,8 @@ instead of:
 -------------------------------------------
 +
 Defaults to false.
+
+rebase.rescheduleFailedExec::
+	Automatically reschedule `exec` commands that failed. This only makes
+	sense in interactive mode (or when an `--exec` option was provided).
+	This is the same as specifying the `--reschedule-failed-exec` option.

builtin/rebase.c

@@ -677,6 +677,11 @@ static int rebase_config(const char *var, const char *value, void *data)
 		return 0;
 	}
 
+	if (!strcmp(var, "rebase.reschedulefailedexec")) {
+		opts->reschedule_failed_exec = git_config_bool(var, value);
+		return 0;
+	}
+
 	return git_default_config(var, value, data);
 }
 

git-legacy-rebase.sh

@@ -99,6 +99,8 @@ case "$(git config --bool commit.gpgsign)" in
 true)	gpg_sign_opt=-S ;;
 *)	gpg_sign_opt= ;;
 esac
+test "$(git config --bool rebase.reschedulefailedexec)" = "true" &&
+reschedule_failed_exec=--reschedule-failed-exec
 . git-rebase--common
 
 read_basic_state () {

t/t3418-rebase-continue.sh

@@ -257,7 +257,12 @@ test_expect_success 'the todo command "break" works' '
 test_expect_success '--reschedule-failed-exec' '
 	test_when_finished "git rebase --abort" &&
 	test_must_fail git rebase -x false --reschedule-failed-exec HEAD^ &&
-	grep "^exec false" .git/rebase-merge/git-rebase-todo
+	grep "^exec false" .git/rebase-merge/git-rebase-todo &&
+	git rebase --abort &&
+	test_must_fail git -c rebase.rescheduleFailedExec=true \
+		rebase -x false HEAD^ 2>err &&
+	grep "^exec false" .git/rebase-merge/git-rebase-todo &&
+	test_i18ngrep "has been rescheduled" err
 '
 
 test_done