Merge branch 'ab/remove-rebase-usebuiltin'

Remove the final hint that we used to have a scripted "git rebase".

* ab/remove-rebase-usebuiltin:
  rebase: remove transitory rebase.useBuiltin setting & env

Documentation/config/rebase.txt

@@ -1,10 +1,3 @@
-rebase.useBuiltin::
-	Unused configuration variable. Used in Git versions 2.20 and
-	2.21 as an escape hatch to enable the legacy shellscript
-	implementation of rebase. Now the built-in rewrite of it in C
-	is always used. Setting this will emit a warning, to alert any
-	remaining users that setting this now does nothing.
-
 rebase.backend::
 	Default backend to use for rebasing.  Possible choices are
 	'apply' or 'merge'.  In the future, if the merge backend gains

builtin/rebase.c

@@ -100,7 +100,6 @@ struct rebase_options {
 	char *strategy, *strategy_opts;
 	struct strbuf git_format_patch_opt;
 	int reschedule_failed_exec;
-	int use_legacy_rebase;
 	int reapply_cherry_picks;
 	int fork_point;
 };
@@ -1102,11 +1101,6 @@ static int rebase_config(const char *var, const char *value, void *data)
 		return 0;
 	}
 
-	if (!strcmp(var, "rebase.usebuiltin")) {
-		opts->use_legacy_rebase = !git_config_bool(var, value);
-		return 0;
-	}
-
 	if (!strcmp(var, "rebase.backend")) {
 		return git_config_string(&opts->default_backend, var, value);
 	}
@@ -1441,11 +1435,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	gpg_sign = options.gpg_sign_opt ? "" : NULL;
 	FREE_AND_NULL(options.gpg_sign_opt);
 
-	if (options.use_legacy_rebase ||
-	    !git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1))
-		warning(_("the rebase.useBuiltin support has been removed!\n"
-			  "See its entry in 'git help config' for details."));
-
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "%s/applying", apply_dir());
 	if(file_exists(buf.buf))

t/t3400-rebase.sh

@@ -388,22 +388,6 @@ test_expect_success 'rebase--merge.sh and --show-current-patch' '
 	)
 '
 
-test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
-	expected="rebase.useBuiltin support has been removed" &&
-
-	# Only warn when the legacy rebase is requested...
-	test_must_fail git -c rebase.useBuiltin=false rebase 2>err &&
-	test_i18ngrep "$expected" err &&
-	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=false git rebase 2>err &&
-	test_i18ngrep "$expected" err &&
-
-	# ...not when we would have used the built-in anyway
-	test_must_fail git -c rebase.useBuiltin=true rebase 2>err &&
-	test_must_be_empty err &&
-	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=true git rebase 2>err &&
-	test_must_be_empty err
-'
-
 test_expect_success 'switch to branch checked out here' '
 	git checkout main &&
 	git rebase main main