Merge branch 'pw/rebase-reflog-fixes'

Fix some bugs in the reflog messages when rebasing and changes the
reflog messages of "rebase --apply" to match "rebase --merge" with
the aim of making the reflog easier to parse.

* pw/rebase-reflog-fixes:
  rebase: cleanup action handling
  rebase --abort: improve reflog message
  rebase --apply: make reflog messages match rebase --merge
  rebase --apply: respect GIT_REFLOG_ACTION
  rebase --merge: fix reflog message after skipping
  rebase --merge: fix reflog when continuing
  t3406: rework rebase reflog tests
  rebase --apply: remove duplicated code

builtin/rebase.c

@@ -59,6 +59,26 @@ enum empty_type {
 	EMPTY_ASK
 };
 
+enum action {
+	ACTION_NONE = 0,
+	ACTION_CONTINUE,
+	ACTION_SKIP,
+	ACTION_ABORT,
+	ACTION_QUIT,
+	ACTION_EDIT_TODO,
+	ACTION_SHOW_CURRENT_PATCH
+};
+
+static const char *action_names[] = {
+	"undefined",
+	"continue",
+	"skip",
+	"abort",
+	"quit",
+	"edit_todo",
+	"show_current_patch"
+};
+
 struct rebase_options {
 	enum rebase_type type;
 	enum empty_type empty;
@@ -85,7 +105,7 @@ struct rebase_options {
 		REBASE_INTERACTIVE_EXPLICIT = 1<<4,
 	} flags;
 	struct strvec git_am_opts;
-	const char *action;
+	enum action action;
 	int signoff;
 	int allow_rerere_autoupdate;
 	int keep_empty;
@@ -157,24 +177,6 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
 	return replay;
 }
 
-enum action {
-	ACTION_NONE = 0,
-	ACTION_CONTINUE,
-	ACTION_SKIP,
-	ACTION_ABORT,
-	ACTION_QUIT,
-	ACTION_EDIT_TODO,
-	ACTION_SHOW_CURRENT_PATCH
-};
-
-static const char *action_names[] = { "undefined",
-				      "continue",
-				      "skip",
-				      "abort",
-				      "quit",
-				      "edit_todo",
-				      "show_current_patch" };
-
 static int edit_todo_file(unsigned flags)
 {
 	const char *todo_file = rebase_path_todo();
@@ -311,8 +313,7 @@ static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
 	return ret;
 }
 
-static int run_sequencer_rebase(struct rebase_options *opts,
+static int run_sequencer_rebase(struct rebase_options *opts)
-				  enum action command)
 {
 	unsigned flags = 0;
 	int abbreviate_commands = 0, ret = 0;
@@ -327,7 +328,7 @@ static int run_sequencer_rebase(struct rebase_options *opts,
 	flags |= opts->reapply_cherry_picks ? TODO_LIST_REAPPLY_CHERRY_PICKS : 0;
 	flags |= opts->flags & REBASE_NO_QUIET ? TODO_LIST_WARN_SKIPPED_CHERRY_PICKS : 0;
 
-	switch (command) {
+	switch (opts->action) {
 	case ACTION_NONE: {
 		if (!opts->onto && !opts->upstream)
 			die(_("a base commit must be provided with --upstream or --onto"));
@@ -360,7 +361,7 @@ static int run_sequencer_rebase(struct rebase_options *opts,
 		break;
 	}
 	default:
-		BUG("invalid command '%d'", command);
+		BUG("invalid command '%d'", opts->action);
 	}
 
 	return ret;
@@ -583,10 +584,11 @@ static int move_to_original_branch(struct rebase_options *opts)
 	if (!opts->onto)
 		BUG("move_to_original_branch without onto");
 
-	strbuf_addf(&branch_reflog, "rebase finished: %s onto %s",
+	strbuf_addf(&branch_reflog, "%s (finish): %s onto %s",
+		    getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
 		    opts->head_name, oid_to_hex(&opts->onto->object.oid));
-	strbuf_addf(&head_reflog, "rebase finished: returning to %s",
+	strbuf_addf(&head_reflog, "%s (finish): returning to %s",
-		    opts->head_name);
+		    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), opts->head_name);
 	ropts.branch = opts->head_name;
 	ropts.flags = RESET_HEAD_REFS_ONLY;
 	ropts.branch_msg = branch_reflog.buf;
@@ -615,8 +617,9 @@ static int run_am(struct rebase_options *opts)
 
 	am.git_cmd = 1;
 	strvec_push(&am.args, "am");
-
+	strvec_pushf(&am.env, GIT_REFLOG_ACTION_ENVIRONMENT "=%s (pick)",
-	if (opts->action && !strcmp("continue", opts->action)) {
+		     getenv(GIT_REFLOG_ACTION_ENVIRONMENT));
+	if (opts->action == ACTION_CONTINUE) {
 		strvec_push(&am.args, "--resolved");
 		strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 		if (opts->gpg_sign_opt)
@@ -627,7 +630,7 @@ static int run_am(struct rebase_options *opts)
 
 		return move_to_original_branch(opts);
 	}
-	if (opts->action && !strcmp("skip", opts->action)) {
+	if (opts->action == ACTION_SKIP) {
 		strvec_push(&am.args, "--skip");
 		strvec_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 		status = run_command(&am);
@@ -636,7 +639,7 @@ static int run_am(struct rebase_options *opts)
 
 		return move_to_original_branch(opts);
 	}
-	if (opts->action && !strcmp("show-current-patch", opts->action)) {
+	if (opts->action == ACTION_SHOW_CURRENT_PATCH) {
 		strvec_push(&am.args, "--show-current-patch");
 		return run_command(&am);
 	}
@@ -729,7 +732,7 @@ static int run_am(struct rebase_options *opts)
 	return status;
 }
 
-static int run_specific_rebase(struct rebase_options *opts, enum action action)
+static int run_specific_rebase(struct rebase_options *opts)
 {
 	int status;
 
@@ -747,7 +750,7 @@ static int run_specific_rebase(struct rebase_options *opts, enum action action)
 			opts->gpg_sign_opt = tmp;
 		}
 
-		status = run_sequencer_rebase(opts, action);
+		status = run_sequencer_rebase(opts);
 	} else if (opts->type == REBASE_APPLY)
 		status = run_am(opts);
 	else
@@ -1005,23 +1008,6 @@ static void NORETURN error_on_missing_default_upstream(void)
 	exit(1);
 }
 
-static void set_reflog_action(struct rebase_options *options)
-{
-	const char *env;
-	struct strbuf buf = STRBUF_INIT;
-
-	if (!is_merge(options))
-		return;
-
-	env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
-	if (env && strcmp("rebase", env))
-		return; /* only override it if it is "rebase" */
-
-	strbuf_addf(&buf, "rebase (%s)", options->action);
-	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
-	strbuf_release(&buf);
-}
-
 static int check_exec_cmd(const char *cmd)
 {
 	if (strchr(cmd, '\n'))
@@ -1046,7 +1032,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	struct strbuf buf = STRBUF_INIT;
 	struct object_id branch_base;
 	int ignore_whitespace = 0;
-	enum action action = ACTION_NONE;
 	const char *gpg_sign = NULL;
 	struct string_list exec = STRING_LIST_INIT_NODUP;
 	const char *rebase_merges = NULL;
@@ -1095,18 +1080,18 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		OPT_BIT(0, "no-ff", &options.flags,
 			N_("cherry-pick all commits, even if unchanged"),
 			REBASE_FORCE),
-		OPT_CMDMODE(0, "continue", &action, N_("continue"),
+		OPT_CMDMODE(0, "continue", &options.action, N_("continue"),
 			    ACTION_CONTINUE),
-		OPT_CMDMODE(0, "skip", &action,
+		OPT_CMDMODE(0, "skip", &options.action,
 			    N_("skip current patch and continue"), ACTION_SKIP),
-		OPT_CMDMODE(0, "abort", &action,
+		OPT_CMDMODE(0, "abort", &options.action,
 			    N_("abort and check out the original branch"),
 			    ACTION_ABORT),
-		OPT_CMDMODE(0, "quit", &action,
+		OPT_CMDMODE(0, "quit", &options.action,
 			    N_("abort but keep HEAD where it is"), ACTION_QUIT),
-		OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
+		OPT_CMDMODE(0, "edit-todo", &options.action, N_("edit the todo list "
 			    "during an interactive rebase"), ACTION_EDIT_TODO),
-		OPT_CMDMODE(0, "show-current-patch", &action,
+		OPT_CMDMODE(0, "show-current-patch", &options.action,
 			    N_("show the patch file being applied or merged"),
 			    ACTION_SHOW_CURRENT_PATCH),
 		OPT_CALLBACK_F(0, "apply", &options, NULL,
@@ -1198,7 +1183,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	} else if (is_directory(merge_dir())) {
 		strbuf_reset(&buf);
 		strbuf_addf(&buf, "%s/rewritten", merge_dir());
-		if (!(action == ACTION_ABORT) && is_directory(buf.buf)) {
+		if (!(options.action == ACTION_ABORT) && is_directory(buf.buf)) {
 			die(_("`rebase --preserve-merges` (-p) is no longer supported.\n"
 			"Use `git rebase --abort` to terminate current rebase.\n"
 			"Or downgrade to v2.33, or earlier, to complete the rebase."));
@@ -1225,7 +1210,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 			"Note: Your `pull.rebase` configuration may also be set to 'preserve',\n"
 			"which is no longer supported; use 'merges' instead"));
 
-	if (action != ACTION_NONE && total_argc != 2) {
+	if (options.action != ACTION_NONE && total_argc != 2) {
 		usage_with_options(builtin_rebase_usage,
 				   builtin_rebase_options);
 	}
@@ -1256,11 +1241,11 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	if (options.root && options.fork_point > 0)
 		die(_("options '%s' and '%s' cannot be used together"), "--root", "--fork-point");
 
-	if (action != ACTION_NONE && !in_progress)
+	if (options.action != ACTION_NONE && !in_progress)
 		die(_("No rebase in progress?"));
 	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
 
-	if (action == ACTION_EDIT_TODO && !is_merge(&options))
+	if (options.action == ACTION_EDIT_TODO && !is_merge(&options))
 		die(_("The --edit-todo action can only be used during "
 		      "interactive rebase."));
 
@@ -1270,18 +1255,15 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		else if (exec.nr)
 			trace2_cmd_mode("interactive-exec");
 		else
-			trace2_cmd_mode(action_names[action]);
+			trace2_cmd_mode(action_names[options.action]);
 	}
 
-	switch (action) {
+	switch (options.action) {
 	case ACTION_CONTINUE: {
 		struct object_id head;
 		struct lock_file lock_file = LOCK_INIT;
 		int fd;
 
-		options.action = "continue";
-		set_reflog_action(&options);
-
 		/* Sanity check */
 		if (get_oid("HEAD", &head))
 			die(_("Cannot read HEAD"));
@@ -1307,9 +1289,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	case ACTION_SKIP: {
 		struct string_list merge_rr = STRING_LIST_INIT_DUP;
 
-		options.action = "skip";
-		set_reflog_action(&options);
-
 		rerere_clear(the_repository, &merge_rr);
 		string_list_clear(&merge_rr, 1);
 		ropts.flags = RESET_HEAD_HARD;
@@ -1322,18 +1301,22 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	}
 	case ACTION_ABORT: {
 		struct string_list merge_rr = STRING_LIST_INIT_DUP;
-		options.action = "abort";
+		struct strbuf head_msg = STRBUF_INIT;
-		set_reflog_action(&options);
 
 		rerere_clear(the_repository, &merge_rr);
 		string_list_clear(&merge_rr, 1);
 
 		if (read_basic_state(&options))
 			exit(1);
+
+		strbuf_addf(&head_msg, "%s (abort): returning to %s",
+			    getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
+			    options.head_name ? options.head_name
+					      : oid_to_hex(&options.orig_head->object.oid));
 		ropts.oid = &options.orig_head->object.oid;
+		ropts.head_msg = head_msg.buf;
 		ropts.branch = options.head_name;
 		ropts.flags = RESET_HEAD_HARD;
-		ropts.default_reflog_action = DEFAULT_REFLOG_ACTION;
 		if (reset_head(the_repository, &ropts) < 0)
 			die(_("could not move back to %s"),
 			    oid_to_hex(&options.orig_head->object.oid));
@@ -1359,17 +1342,15 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		goto cleanup;
 	}
 	case ACTION_EDIT_TODO:
-		options.action = "edit-todo";
 		options.dont_finish_rebase = 1;
 		goto run_rebase;
 	case ACTION_SHOW_CURRENT_PATCH:
-		options.action = "show-current-patch";
 		options.dont_finish_rebase = 1;
 		goto run_rebase;
 	case ACTION_NONE:
 		break;
 	default:
-		BUG("action: %d", action);
+		BUG("action: %d", options.action);
 	}
 
 	/* Make sure no rebase is in progress */
@@ -1393,7 +1374,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	}
 
 	if ((options.flags & REBASE_INTERACTIVE_EXPLICIT) ||
-	    (action != ACTION_NONE) ||
+	    (options.action != ACTION_NONE) ||
 	    (exec.nr > 0) ||
 	    options.autosquash) {
 		allow_preemptive_ff = 0;
@@ -1804,7 +1785,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		printf(_("First, rewinding head to replay your work on top of "
 			 "it...\n"));
 
-	strbuf_addf(&msg, "%s: checkout %s",
+	strbuf_addf(&msg, "%s (start): checkout %s",
 		    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
 	ropts.oid = &options.onto->object.oid;
 	ropts.orig_head = &options.orig_head->object.oid,
@@ -1820,19 +1801,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	 * If the onto is a proper descendant of the tip of the branch, then
 	 * we just fast-forwarded.
 	 */
-	strbuf_reset(&msg);
 	if (oideq(&branch_base, &options.orig_head->object.oid)) {
 		printf(_("Fast-forwarded %s to %s.\n"),
 			branch_name, options.onto_name);
-		strbuf_addf(&msg, "rebase finished: %s onto %s",
+		move_to_original_branch(&options);
-			options.head_name ? options.head_name : "detached HEAD",
-			oid_to_hex(&options.onto->object.oid));
-		memset(&ropts, 0, sizeof(ropts));
-		ropts.branch = options.head_name;
-		ropts.flags = RESET_HEAD_REFS_ONLY;
-		ropts.head_msg = msg.buf;
-		reset_head(the_repository, &ropts);
-		strbuf_release(&msg);
 		ret = finish_rebase(&options);
 		goto cleanup;
 	}
@@ -1847,7 +1819,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	options.revisions = revisions.buf;
 
 run_rebase:
-	ret = run_specific_rebase(&options, action);
+	ret = run_specific_rebase(&options);
 
 cleanup:
 	strbuf_release(&buf);

sequencer.c

@@ -5050,6 +5050,8 @@ int sequencer_continue(struct repository *r, struct replay_opts *opts)
 	if (read_populate_opts(opts))
 		return -1;
 	if (is_rebase_i(opts)) {
+		char *previous_reflog_action;
+
 		if ((res = read_populate_todo(r, &todo_list, opts)))
 			goto release_todo_list;
 
@@ -5060,10 +5062,13 @@ int sequencer_continue(struct repository *r, struct replay_opts *opts)
 			unlink(rebase_path_dropped());
 		}
 
+		previous_reflog_action = xstrdup(getenv(GIT_REFLOG_ACTION));
+		setenv(GIT_REFLOG_ACTION, reflog_message(opts, "continue", NULL), 1);
 		if (commit_staged_changes(r, opts, &todo_list)) {
 			res = -1;
 			goto release_todo_list;
 		}
+		setenv(GIT_REFLOG_ACTION, previous_reflog_action, 1);
 	} else if (!file_exists(get_todo_path(opts)))
 		return continue_single_pick(r, opts);
 	else if ((res = read_populate_todo(r, &todo_list, opts)))

t/t3406-rebase-message.sh

@@ -10,10 +10,16 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 test_expect_success 'setup' '
 	test_commit O fileO &&
 	test_commit X fileX &&
+	git branch fast-forward &&
 	test_commit A fileA &&
 	test_commit B fileB &&
 	test_commit Y fileY &&
 
+	git checkout -b conflicts O &&
+	test_commit P &&
+	test_commit conflict-X fileX &&
+	test_commit Q &&
+
 	git checkout -b topic O &&
 	git cherry-pick A B &&
 	test_commit Z fileZ &&
@@ -79,54 +85,165 @@ test_expect_success 'error out early upon -C<n> or --whitespace=<bad>' '
 	test_i18ngrep "Invalid whitespace option" err
 '
 
-test_expect_success 'GIT_REFLOG_ACTION' '
+write_reflog_expect () {
-	git checkout start &&
+	if test $mode = --apply
-	test_commit reflog-onto &&
+	then
-	git checkout -b reflog-topic start &&
+		sed 's/(continue)/(pick)/'
-	test_commit reflog-to-rebase &&
+	else
+		cat
+	fi >expect
+}
 
-	git rebase reflog-onto &&
+test_reflog () {
-	git log -g --format=%gs -3 >actual &&
+	mode=$1
-	cat >expect <<-\EOF &&
+	reflog_action="$2"
-	rebase (finish): returning to refs/heads/reflog-topic
+
-	rebase (pick): reflog-to-rebase
+	test_expect_success "rebase $mode reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
-	rebase (start): checkout reflog-onto
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		echo resolved >fileX &&
+		git add fileX &&
+		git rebase --continue
+	) &&
+
+	git log -g --format=%gs -5 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): Q
+	${reflog_action:-rebase} (continue): conflict-X
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
 	EOF
 	test_cmp expect actual &&
 
-	git checkout -b reflog-prefix reflog-to-rebase &&
+	git log -g --format=%gs -1 conflicts >actual &&
-	GIT_REFLOG_ACTION=change-the-reflog git rebase reflog-onto &&
+	write_reflog_expect <<-EOF &&
-	git log -g --format=%gs -3 >actual &&
+	${reflog_action:-rebase} (finish): refs/heads/conflicts onto $(git rev-parse main)
-	cat >expect <<-\EOF &&
-	change-the-reflog (finish): returning to refs/heads/reflog-prefix
-	change-the-reflog (pick): reflog-to-rebase
-	change-the-reflog (start): checkout reflog-onto
-	EOF
-	test_cmp expect actual
-'
-
-test_expect_success 'rebase --apply reflog' '
-	git checkout -b reflog-apply start &&
-	old_head_reflog="$(git log -g --format=%gs -1 HEAD)" &&
-
-	git rebase --apply Y &&
-
-	git log -g --format=%gs -4 HEAD >actual &&
-	cat >expect <<-EOF &&
-	rebase finished: returning to refs/heads/reflog-apply
-	rebase: Z
-	rebase: checkout Y
-	$old_head_reflog
 	EOF
 	test_cmp expect actual &&
 
-	git log -g --format=%gs -2 reflog-apply >actual &&
+	# check there is only one new entry in the branch reflog
-	cat >expect <<-EOF &&
+	test_cmp_rev conflicts@{1} Q
-	rebase finished: refs/heads/reflog-apply onto $(git rev-parse Y)
+	'
-	branch: Created from start
+
+	test_expect_success "rebase $mode fast-forward reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout fast-forward &&
+	test_when_finished "git reset --hard X" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		git rebase $mode main
+	) &&
+
+	git log -g --format=%gs -2 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/fast-forward
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual &&
+
+	git log -g --format=%gs -1 fast-forward >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): refs/heads/fast-forward onto $(git rev-parse main)
+	EOF
+	test_cmp expect actual &&
+
+	# check there is only one new entry in the branch reflog
+	test_cmp_rev fast-forward@{1} X
+	'
+
+	test_expect_success "rebase $mode --skip reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --skip
+	) &&
+
+	git log -g --format=%gs -4 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (finish): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): Q
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
 	EOF
 	test_cmp expect actual
-'
+	'
+
+	test_expect_success "rebase $mode --abort reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout conflicts &&
+	test_when_finished "git reset --hard Q" &&
+
+	git log -g -1 conflicts >branch-expect &&
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --abort
+	) &&
+
+	git log -g --format=%gs -3 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (abort): returning to refs/heads/conflicts
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual &&
+
+	# check branch reflog is unchanged
+	git log -g -1 conflicts >branch-actual &&
+	test_cmp branch-expect branch-actual
+	'
+
+	test_expect_success "rebase $mode --abort detached HEAD reflog${reflog_action:+ GIT_REFLOG_ACTION=$reflog_action}" '
+	git checkout Q &&
+	test_when_finished "git reset --hard Q" &&
+
+	(
+		if test -n "$reflog_action"
+		then
+			GIT_REFLOG_ACTION="$reflog_action" &&
+			export GIT_REFLOG_ACTION
+		fi &&
+		test_must_fail git rebase $mode main &&
+		git rebase --abort
+	) &&
+
+	git log -g --format=%gs -3 >actual &&
+	write_reflog_expect <<-EOF &&
+	${reflog_action:-rebase} (abort): returning to $(git rev-parse Q)
+	${reflog_action:-rebase} (pick): P
+	${reflog_action:-rebase} (start): checkout main
+	EOF
+	test_cmp expect actual
+	'
+}
+
+test_reflog --merge
+test_reflog --merge my-reflog-action
+test_reflog --apply
+test_reflog --apply my-reflog-action
 
 test_expect_success 'rebase -i onto unrelated history' '
 	git init unrelated &&