Re: [PATCH] rebase: remove transitory rebase.useBuiltin setting & env

> Remove the rebase.useBuiltin setting and the now-obsolete
> GIT_TEST_REBASE_USE_BUILTIN test flag.
>
> This was left in place after my d03ebd411c6 (rebase: remove the
> rebase.useBuiltin setting, 2019-03-18) to help anyone who'd used the
> experimental flag and wanted to know that it was the default, or that
> they should transition their test environment to use the builtin
> rebase unconditionally.
>
> It's been more than long enough for those users to get a headsup about
> this. So remove all the scaffolding that was left inplace after
> d03ebd411c6. I'm also removing the documentation entry, if anyone
> still has this left in their configuration they can do some source
> archaeology to figure out what it used to do, which makes more sense
> than exposing every git user reading the documentation to this legacy
> configuration switch.
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>

> ---
>  Documentation/config/rebase.txt |  7 -------
>  builtin/rebase.c                | 11 -----------
>  t/t3400-rebase.sh               | 16 ----------------
>  3 files changed, 34 deletions(-)
>
> diff --git a/Documentation/config/rebase.txt b/Documentation/config/rebase.txt
> index 214f31b451f..8c979cb20f2 100644
> --- a/Documentation/config/rebase.txt
> +++ b/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
> diff --git a/builtin/rebase.c b/builtin/rebase.c
> index de400f9a197..783b526f6e7 100644
> --- a/builtin/rebase.c
> +++ b/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))
> diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
> index 587b408063a..0bb88aa982b 100755
> --- a/t/t3400-rebase.sh
> +++ b/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
> --
> 2.31.0.366.g75c23356abd
>
>