From 8423083540e08298d3aa3b48e76639658cd11470 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Thu, 20 Jun 2019 23:09:08 +0200
Subject: [PATCH 1/9] config tests: simplify include cycle test
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Simplify an overly verbose test added in 9b25a0b52e ("config: add
include directive", 2012-02-06). The "expect" file was never used, and
by using .gitconfig it's not as intuitive to reproduce this manually
with "-d" as some other tests, since HOME needs to be set in the
environment.

Also remove the use of test_i18ngrep added in a769bfc74f ("config.c:
mark more strings for translation", 2018-07-21) in favor of overriding
the GIT_TEST_GETTEXT_POISON value.

Using the i18n test wrappers hasn't been needed since my
6cdccfce1e ("i18n: make GETTEXT_POISON a runtime option", 2018-11-08).
As a follow-up change to the yet-to-be-added t0017-env-helper.sh will
show, doing it this way can hide a regression when combined with
trace2's early config reading. That early config reading was added in
bce9db6de9 ("trace2: use system/global config for default trace2
settings", 2019-04-15).

So let's remove the testing for that potential regression here, I'll
instead add it explicitly to t0017-env-helper.sh in a follow-up
change.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t1305-config-include.sh | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/t/t1305-config-include.sh b/t/t1305-config-include.sh
index 579a86b7f8..6b388ba2d0 100755
--- a/t/t1305-config-include.sh
+++ b/t/t1305-config-include.sh
@@ -310,20 +310,13 @@ test_expect_success SYMLINKS 'conditional include, gitdir matching symlink, icas
 '
 
 test_expect_success 'include cycles are detected' '
-	cat >.gitconfig <<-\EOF &&
-	[test]value = gitconfig
-	[include]path = cycle
-	EOF
-	cat >cycle <<-\EOF &&
-	[test]value = cycle
-	[include]path = .gitconfig
-	EOF
-	cat >expect <<-\EOF &&
-	gitconfig
-	cycle
-	EOF
-	test_must_fail git config --get-all test.value 2>stderr &&
-	test_i18ngrep "exceeded maximum include depth" stderr
+	git init --bare cycle &&
+	git -C cycle config include.path cycle &&
+	git config -f cycle/cycle include.path config &&
+	test_must_fail \
+		env GIT_TEST_GETTEXT_POISON= \
+		git -C cycle config --get-all test.value 2>stderr &&
+	grep "exceeded maximum include depth" stderr
 '
 
 test_done

From b4f207f339469e604260bdf6da8673db9c9c9105 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:06 +0200
Subject: [PATCH 2/9] env--helper: new undocumented builtin wrapping
 git_env_*()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

We have many GIT_TEST_* variables that accept a <boolean> because
they're implemented in C, and then some that take <non-empty?> because
they're implemented at least partially in shellscript.

Add a helper that wraps git_env_bool() and git_env_ulong() as the
first step in fixing this. This isn't being added as a test-tool mode
because some of these are used outside the test suite.

Part of what this tool does can be done via a trick with "git config"
added in 83d842dc8c ("tests: turn on network daemon tests by default",
2014-02-10) for test_tristate(), i.e.:

    git -c magic.variable="$1" config --bool magic.variable 2>/dev/null

But as subsequent changes will show being able to pass along the
default value makes all the difference, and we'll be able to replace
test_tristate() itself with that.

The --type=bool option will be used by subsequent patches, but not
--type=ulong. I figured it was easy enough to add it & test for it so
I left it in so we'd have wrappers for both git_env_*() functions, and
to have a template to make it obvious how we'd add --type=int etc. if
it's needed in the future.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 .gitignore            |  1 +
 Makefile              |  1 +
 builtin.h             |  1 +
 builtin/env--helper.c | 95 +++++++++++++++++++++++++++++++++++++++++++
 git.c                 |  1 +
 t/t0017-env-helper.sh | 83 +++++++++++++++++++++++++++++++++++++
 6 files changed, 182 insertions(+)
 create mode 100644 builtin/env--helper.c
 create mode 100755 t/t0017-env-helper.sh

diff --git a/.gitignore b/.gitignore
index 4470d7cfc0..1f7a83fb3c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,6 +58,7 @@
 /git-difftool
 /git-difftool--helper
 /git-describe
+/git-env--helper
 /git-fast-export
 /git-fast-import
 /git-fetch
diff --git a/Makefile b/Makefile
index f58bf14c7b..f2cfc8d812 100644
--- a/Makefile
+++ b/Makefile
@@ -1059,6 +1059,7 @@ BUILTIN_OBJS += builtin/diff-index.o
 BUILTIN_OBJS += builtin/diff-tree.o
 BUILTIN_OBJS += builtin/diff.o
 BUILTIN_OBJS += builtin/difftool.o
+BUILTIN_OBJS += builtin/env--helper.o
 BUILTIN_OBJS += builtin/fast-export.o
 BUILTIN_OBJS += builtin/fetch-pack.o
 BUILTIN_OBJS += builtin/fetch.o
diff --git a/builtin.h b/builtin.h
index ec7e0954c4..93bd49fe4f 100644
--- a/builtin.h
+++ b/builtin.h
@@ -160,6 +160,7 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix);
 int cmd_diff(int argc, const char **argv, const char *prefix);
 int cmd_diff_tree(int argc, const char **argv, const char *prefix);
 int cmd_difftool(int argc, const char **argv, const char *prefix);
+int cmd_env__helper(int argc, const char **argv, const char *prefix);
 int cmd_fast_export(int argc, const char **argv, const char *prefix);
 int cmd_fetch(int argc, const char **argv, const char *prefix);
 int cmd_fetch_pack(int argc, const char **argv, const char *prefix);
diff --git a/builtin/env--helper.c b/builtin/env--helper.c
new file mode 100644
index 0000000000..1083c0f707
--- /dev/null
+++ b/builtin/env--helper.c
@@ -0,0 +1,95 @@
+#include "builtin.h"
+#include "config.h"
+#include "parse-options.h"
+
+static char const * const env__helper_usage[] = {
+	N_("git env--helper --type=[bool|ulong] <options> <env-var>"),
+	NULL
+};
+
+enum {
+	ENV_HELPER_TYPE_BOOL = 1,
+	ENV_HELPER_TYPE_ULONG
+} cmdmode = 0;
+
+static int option_parse_type(const struct option *opt, const char *arg,
+			     int unset)
+{
+	if (!strcmp(arg, "bool"))
+		cmdmode = ENV_HELPER_TYPE_BOOL;
+	else if (!strcmp(arg, "ulong"))
+		cmdmode = ENV_HELPER_TYPE_ULONG;
+	else
+		die(_("unrecognized --type argument, %s"), arg);
+
+	return 0;
+}
+
+int cmd_env__helper(int argc, const char **argv, const char *prefix)
+{
+	int exit_code = 0;
+	const char *env_variable = NULL;
+	const char *env_default = NULL;
+	int ret;
+	int ret_int, default_int;
+	unsigned long ret_ulong, default_ulong;
+	struct option opts[] = {
+		OPT_CALLBACK_F(0, "type", &cmdmode, N_("type"),
+			       N_("value is given this type"), PARSE_OPT_NONEG,
+			       option_parse_type),
+		OPT_STRING(0, "default", &env_default, N_("value"),
+			   N_("default for git_env_*(...) to fall back on")),
+		OPT_BOOL(0, "exit-code", &exit_code,
+			 N_("be quiet only use git_env_*() value as exit code")),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, prefix, opts, env__helper_usage,
+			     PARSE_OPT_KEEP_UNKNOWN);
+	if (env_default && !*env_default)
+		usage_with_options(env__helper_usage, opts);
+	if (!cmdmode)
+		usage_with_options(env__helper_usage, opts);
+	if (argc != 1)
+		usage_with_options(env__helper_usage, opts);
+	env_variable = argv[0];
+
+	switch (cmdmode) {
+	case ENV_HELPER_TYPE_BOOL:
+		if (env_default) {
+			default_int = git_parse_maybe_bool(env_default);
+			if (default_int == -1) {
+				error(_("option `--default' expects a boolean value with `--type=bool`, not `%s`"),
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_int = 0;
+		}
+		ret_int = git_env_bool(env_variable, default_int);
+		if (!exit_code)
+			puts(ret_int ? "true" : "false");
+		ret = ret_int;
+		break;
+	case ENV_HELPER_TYPE_ULONG:
+		if (env_default) {
+			if (!git_parse_ulong(env_default, &default_ulong)) {
+				error(_("option `--default' expects an unsigned long value with `--type=ulong`, not `%s`"),
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_ulong = 0;
+		}
+		ret_ulong = git_env_ulong(env_variable, default_ulong);
+		if (!exit_code)
+			printf("%lu\n", ret_ulong);
+		ret = ret_ulong;
+		break;
+	default:
+		BUG("unknown <type> value");
+		break;
+	}
+
+	return !ret;
+}
diff --git a/git.c b/git.c
index c2eec470c9..a43e1dd98e 100644
--- a/git.c
+++ b/git.c
@@ -500,6 +500,7 @@ static struct cmd_struct commands[] = {
 	{ "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT },
 	{ "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT },
 	{ "difftool", cmd_difftool, RUN_SETUP_GENTLY },
+	{ "env--helper", cmd_env__helper },
 	{ "fast-export", cmd_fast_export, RUN_SETUP },
 	{ "fetch", cmd_fetch, RUN_SETUP },
 	{ "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT },
diff --git a/t/t0017-env-helper.sh b/t/t0017-env-helper.sh
new file mode 100755
index 0000000000..709bbbd275
--- /dev/null
+++ b/t/t0017-env-helper.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+test_description='test env--helper'
+
+. ./test-lib.sh
+
+
+test_expect_success 'env--helper usage' '
+	test_must_fail git env--helper &&
+	test_must_fail git env--helper --type=bool &&
+	test_must_fail git env--helper --type=ulong &&
+	test_must_fail git env--helper --type=bool &&
+	test_must_fail git env--helper --type=bool --default &&
+	test_must_fail git env--helper --type=bool --default= &&
+	test_must_fail git env--helper --defaultxyz
+'
+
+test_expect_success 'env--helper bad default values' '
+	test_must_fail git env--helper --type=bool --default=1xyz MISSING &&
+	test_must_fail git env--helper --type=ulong --default=1xyz MISSING
+'
+
+test_expect_success 'env--helper --type=bool' '
+	# Test various --default bool values
+	echo true >expected &&
+	git env--helper --type=bool --default=1 MISSING >actual &&
+	test_cmp expected actual &&
+	git env--helper --type=bool --default=yes MISSING >actual &&
+	test_cmp expected actual &&
+	git env--helper --type=bool --default=true MISSING >actual &&
+	test_cmp expected actual &&
+	echo false >expected &&
+	test_must_fail git env--helper --type=bool --default=0 MISSING >actual &&
+	test_cmp expected actual &&
+	test_must_fail git env--helper --type=bool --default=no MISSING >actual &&
+	test_cmp expected actual &&
+	test_must_fail git env--helper --type=bool --default=false MISSING >actual &&
+	test_cmp expected actual &&
+
+	# No output with --exit-code
+	git env--helper --type=bool --default=true --exit-code MISSING >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err &&
+	test_must_fail git env--helper --type=bool --default=false --exit-code MISSING >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err &&
+
+	# Existing variable
+	EXISTS=true git env--helper --type=bool --default=false --exit-code EXISTS >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err &&
+	test_must_fail \
+		env EXISTS=false \
+		git env--helper --type=bool --default=true --exit-code EXISTS >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err
+'
+
+test_expect_success 'env--helper --type=ulong' '
+	echo 1234567890 >expected &&
+	git env--helper --type=ulong --default=1234567890 MISSING >actual.out 2>actual.err &&
+	test_cmp expected actual.out &&
+	test_must_be_empty actual.err &&
+
+	echo 0 >expected &&
+	test_must_fail git env--helper --type=ulong --default=0 MISSING >actual &&
+	test_cmp expected actual &&
+
+	git env--helper --type=ulong --default=1234567890 --exit-code MISSING >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err &&
+
+	EXISTS=1234567890 git env--helper --type=ulong --default=0 EXISTS --exit-code >actual.out 2>actual.err &&
+	test_must_be_empty actual.out &&
+	test_must_be_empty actual.err &&
+
+	echo 1234567890 >expected &&
+	EXISTS=1234567890 git env--helper --type=ulong --default=0 EXISTS >actual.out 2>actual.err &&
+	test_cmp expected actual.out &&
+	test_must_be_empty actual.err
+'
+
+test_done

From 2e43cd4caa8ad9eb0c53adc1e00dcd027b8710fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:07 +0200
Subject: [PATCH 3/9] config.c: refactor die_bad_number() to not call gettext()
 early
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Prepare die_bad_number() for a change to specially handle
GIT_TEST_GETTEXT_POISON calling git_env_bool() by making
die_bad_number() not call gettext() early, which would in turn call
git_env_bool().

There's no meaningful change here yet, just a re-arrangement of the
current code to make that subsequent change easier to read.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 config.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/config.c b/config.c
index 296a6d9cc4..374cb33005 100644
--- a/config.c
+++ b/config.c
@@ -949,34 +949,35 @@ int git_parse_ssize_t(const char *value, ssize_t *ret)
 NORETURN
 static void die_bad_number(const char *name, const char *value)
 {
-	const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
+	const char *error_type = (errno == ERANGE) ?
+		N_("out of range") : N_("invalid unit");
+	const char *bad_numeric = N_("bad numeric config value '%s' for '%s': %s");
 
 	if (!value)
 		value = "";
 
 	if (!(cf && cf->name))
-		die(_("bad numeric config value '%s' for '%s': %s"),
-		    value, name, error_type);
+		die(_(bad_numeric), value, name, _(error_type));
 
 	switch (cf->origin_type) {
 	case CONFIG_ORIGIN_BLOB:
 		die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
-		    value, name, cf->name, error_type);
+		    value, name, cf->name, _(error_type));
 	case CONFIG_ORIGIN_FILE:
 		die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
-		    value, name, cf->name, error_type);
+		    value, name, cf->name, _(error_type));
 	case CONFIG_ORIGIN_STDIN:
 		die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
-		    value, name, error_type);
+		    value, name, _(error_type));
 	case CONFIG_ORIGIN_SUBMODULE_BLOB:
 		die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
-		    value, name, cf->name, error_type);
+		    value, name, cf->name, _(error_type));
 	case CONFIG_ORIGIN_CMDLINE:
 		die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
-		    value, name, cf->name, error_type);
+		    value, name, cf->name, _(error_type));
 	default:
 		die(_("bad numeric config value '%s' for '%s' in %s: %s"),
-		    value, name, cf->name, error_type);
+		    value, name, cf->name, _(error_type));
 	}
 }
 

From e3d5e4bd5a167a50b6cda43ee1eaedef9842fe86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:08 +0200
Subject: [PATCH 4/9] t6040 test: stop using global "script" variable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Change test code added in c0234b2ef6 ("stat_tracking_info(): clear
object flags used during counting", 2008-07-03) to stop using the
"script" variable also used for lazy prerequisites in
test-lib-functions.sh.

Since this test uses test_i18ncmp and expects to use its own "script"
variable twice it implicitly depends on the C_LOCALE_OUTPUT
prerequisite not being a lazy prerequisite. A follow-up change will
make it a lazy prerequisite, so we must remove this landmine before
inadvertently stepping on it as we make that change.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t6040-tracking-info.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/t6040-tracking-info.sh b/t/t6040-tracking-info.sh
index 716283b274..970b25a289 100755
--- a/t/t6040-tracking-info.sh
+++ b/t/t6040-tracking-info.sh
@@ -38,7 +38,7 @@ test_expect_success setup '
 	advance h
 '
 
-script='s/^..\(b.\) *[0-9a-f]* \(.*\)$/\1 \2/p'
+t6040_script='s/^..\(b.\) *[0-9a-f]* \(.*\)$/\1 \2/p'
 cat >expect <<\EOF
 b1 [ahead 1, behind 1] d
 b2 [ahead 1, behind 1] d
@@ -53,7 +53,7 @@ test_expect_success 'branch -v' '
 		cd test &&
 		git branch -v
 	) |
-	sed -n -e "$script" >actual &&
+	sed -n -e "$t6040_script" >actual &&
 	test_i18ncmp expect actual
 '
 
@@ -71,7 +71,7 @@ test_expect_success 'branch -vv' '
 		cd test &&
 		git branch -vv
 	) |
-	sed -n -e "$script" >actual &&
+	sed -n -e "$t6040_script" >actual &&
 	test_i18ncmp expect actual
 '
 

From 1ff750b128e041b3477ef9ee2768990e606d1c33 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:09 +0200
Subject: [PATCH 5/9] tests: make GIT_TEST_GETTEXT_POISON a boolean
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Change the GIT_TEST_GETTEXT_POISON variable from being "non-empty?" to
being a more standard boolean variable.

Since it needed to be checked in both C code and shellscript (via test
-n) it was one of the remaining shellscript-like variables. Now that
we have "env--helper" we can change that.

There's a couple of tricky edge cases that arise because we're using
git_env_bool() early, and the config-reading "env--helper".

If GIT_TEST_GETTEXT_POISON is set to an invalid value die_bad_number()
will die, but to do so it would usually call gettext(). Let's detect
the special case of GIT_TEST_GETTEXT_POISON and always emit that
message in the C locale, lest we infinitely loop.

As seen in the updated tests in t0017-env-helper.sh there's also a
caveat related to "env--helper" needing to read the config for trace2
purposes.

Since the C_LOCALE_OUTPUT prerequisite is lazy and relies on
"env--helper" we could get invalid results if we failed to read the
config (e.g. because we'd loop on includes) when combined with
e.g. "test_i18ngrep" wanting to check with "env--helper" if
GIT_TEST_GETTEXT_POISON was true or not.

I'm crossing my fingers and hoping that a test similar to the one I
removed in the earlier "config tests: simplify include cycle test"
change in this series won't happen again, and testing for this
explicitly in "env--helper"'s own tests.

This change breaks existing uses of
e.g. GIT_TEST_GETTEXT_POISON=YesPlease, which we've documented in
po/README and other places. As noted in [1] we might want to consider
also accepting "YesPlease" in "env--helper" as a special-case.

But as the lack of uproar over 6cdccfce1e ("i18n: make GETTEXT_POISON
a runtime option", 2018-11-08) demonstrates the audience for this
option is a really narrow set of git developers, who shouldn't have
much trouble modifying their test scripts, so I think it's better to
deal with that minor headache now and make all the relevant GIT_TEST_*
variables boolean in the same way than carry the "YesPlease"
special-case forward.

1. https://public-inbox.org/git/xmqqtvckm3h8.fsf@gitster-ct.c.googlers.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 ci/lib.sh                 |  2 +-
 config.c                  |  9 +++++++++
 gettext.c                 |  6 ++----
 git-sh-i18n.sh            |  4 +++-
 po/README                 |  2 +-
 t/README                  |  4 ++--
 t/t0017-env-helper.sh     | 16 ++++++++++++++++
 t/t0205-gettext-poison.sh |  7 ++++++-
 t/t1305-config-include.sh |  2 +-
 t/t7201-co.sh             |  2 +-
 t/t9902-completion.sh     |  2 +-
 t/test-lib.sh             |  8 +++-----
 12 files changed, 46 insertions(+), 18 deletions(-)

diff --git a/ci/lib.sh b/ci/lib.sh
index 288a5b3884..fd799ae663 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -184,7 +184,7 @@ osx-clang|osx-gcc)
 	export GIT_SKIP_TESTS="t9810 t9816"
 	;;
 GIT_TEST_GETTEXT_POISON)
-	export GIT_TEST_GETTEXT_POISON=YesPlease
+	export GIT_TEST_GETTEXT_POISON=true
 	;;
 esac
 
diff --git a/config.c b/config.c
index 374cb33005..b985d60fa4 100644
--- a/config.c
+++ b/config.c
@@ -956,6 +956,15 @@ static void die_bad_number(const char *name, const char *value)
 	if (!value)
 		value = "";
 
+	if (!strcmp(name, "GIT_TEST_GETTEXT_POISON"))
+		/*
+		 * We explicitly *don't* use _() here since it would
+		 * cause an infinite loop with _() needing to call
+		 * use_gettext_poison(). This is why marked up
+		 * translations with N_() above.
+		 */
+		die(bad_numeric, value, name, error_type);
+
 	if (!(cf && cf->name))
 		die(_(bad_numeric), value, name, _(error_type));
 
diff --git a/gettext.c b/gettext.c
index d4021d690c..5c71f4c8b9 100644
--- a/gettext.c
+++ b/gettext.c
@@ -50,10 +50,8 @@ const char *get_preferred_languages(void)
 int use_gettext_poison(void)
 {
 	static int poison_requested = -1;
-	if (poison_requested == -1) {
-		const char *v = getenv("GIT_TEST_GETTEXT_POISON");
-		poison_requested = v && strlen(v) ? 1 : 0;
-	}
+	if (poison_requested == -1)
+		poison_requested = git_env_bool("GIT_TEST_GETTEXT_POISON", 0);
 	return poison_requested;
 }
 
diff --git a/git-sh-i18n.sh b/git-sh-i18n.sh
index e1d917fd27..8eef60b43f 100644
--- a/git-sh-i18n.sh
+++ b/git-sh-i18n.sh
@@ -17,7 +17,9 @@ export TEXTDOMAINDIR
 
 # First decide what scheme to use...
 GIT_INTERNAL_GETTEXT_SH_SCHEME=fallthrough
-if test -n "$GIT_TEST_GETTEXT_POISON"
+if test -n "$GIT_TEST_GETTEXT_POISON" &&
+	    git env--helper --type=bool --default=0 --exit-code \
+		GIT_TEST_GETTEXT_POISON
 then
 	GIT_INTERNAL_GETTEXT_SH_SCHEME=poison
 elif test -n "@@USE_GETTEXT_SCHEME@@"
diff --git a/po/README b/po/README
index aa704ffcb7..07595d369b 100644
--- a/po/README
+++ b/po/README
@@ -293,7 +293,7 @@ To smoke out issues like these, Git tested with a translation mode that
 emits gibberish on every call to gettext. To use it run the test suite
 with it, e.g.:
 
-    cd t && GIT_TEST_GETTEXT_POISON=YesPlease prove -j 9 ./t[0-9]*.sh
+    cd t && GIT_TEST_GETTEXT_POISON=true prove -j 9 ./t[0-9]*.sh
 
 If tests break with it you should inspect them manually and see if
 what you're translating is sane, i.e. that you're not translating
diff --git a/t/README b/t/README
index 9747971d58..9a131f472e 100644
--- a/t/README
+++ b/t/README
@@ -343,8 +343,8 @@ whether this mode is active, and e.g. skip some tests that are hard to
 refactor to deal with it. The "SYMLINKS" prerequisite is currently
 excluded as so much relies on it, but this might change in the future.
 
-GIT_TEST_GETTEXT_POISON=<non-empty?> turns all strings marked for
-translation into gibberish if non-empty (think "test -n"). Used for
+GIT_TEST_GETTEXT_POISON=<boolean> turns all strings marked for
+translation into gibberish if true. Used for
 spotting those tests that need to be marked with a C_LOCALE_OUTPUT
 prerequisite when adding more strings for translation. See "Testing
 marked strings" in po/README for details.
diff --git a/t/t0017-env-helper.sh b/t/t0017-env-helper.sh
index 709bbbd275..c1ecf6aeac 100755
--- a/t/t0017-env-helper.sh
+++ b/t/t0017-env-helper.sh
@@ -80,4 +80,20 @@ test_expect_success 'env--helper --type=ulong' '
 	test_must_be_empty actual.err
 '
 
+test_expect_success 'env--helper reads config thanks to trace2' '
+	mkdir home &&
+	git config -f home/.gitconfig include.path cycle &&
+	git config -f home/cycle include.path .gitconfig &&
+
+	test_must_fail \
+		env HOME="$(pwd)/home" GIT_TEST_GETTEXT_POISON=false \
+		git config -l 2>err &&
+	grep "exceeded maximum include depth" err &&
+
+	test_must_fail \
+		env HOME="$(pwd)/home" GIT_TEST_GETTEXT_POISON=true \
+		git -C cycle env--helper --type=bool --default=0 --exit-code GIT_TEST_GETTEXT_POISON 2>err &&
+	grep "# GETTEXT POISON #" err
+'
+
 test_done
diff --git a/t/t0205-gettext-poison.sh b/t/t0205-gettext-poison.sh
index a06269f38a..f9fa16ad83 100755
--- a/t/t0205-gettext-poison.sh
+++ b/t/t0205-gettext-poison.sh
@@ -5,7 +5,7 @@
 
 test_description='Gettext Shell poison'
 
-GIT_TEST_GETTEXT_POISON=YesPlease
+GIT_TEST_GETTEXT_POISON=true
 export GIT_TEST_GETTEXT_POISON
 . ./lib-gettext.sh
 
@@ -31,4 +31,9 @@ test_expect_success 'eval_gettext: our eval_gettext() fallback has poison semant
     test_cmp expect actual
 '
 
+test_expect_success "gettext: invalid GIT_TEST_GETTEXT_POISON value doesn't infinitely loop" "
+	test_must_fail env GIT_TEST_GETTEXT_POISON=xyz git version 2>error &&
+	grep \"fatal: bad numeric config value 'xyz' for 'GIT_TEST_GETTEXT_POISON': invalid unit\" error
+"
+
 test_done
diff --git a/t/t1305-config-include.sh b/t/t1305-config-include.sh
index 6b388ba2d0..de294c990e 100755
--- a/t/t1305-config-include.sh
+++ b/t/t1305-config-include.sh
@@ -314,7 +314,7 @@ test_expect_success 'include cycles are detected' '
 	git -C cycle config include.path cycle &&
 	git config -f cycle/cycle include.path config &&
 	test_must_fail \
-		env GIT_TEST_GETTEXT_POISON= \
+		env GIT_TEST_GETTEXT_POISON=false \
 		git -C cycle config --get-all test.value 2>stderr &&
 	grep "exceeded maximum include depth" stderr
 '
diff --git a/t/t7201-co.sh b/t/t7201-co.sh
index 5990299fc9..b696bae5f5 100755
--- a/t/t7201-co.sh
+++ b/t/t7201-co.sh
@@ -249,7 +249,7 @@ test_expect_success 'checkout to detach HEAD (with advice declined)' '
 test_expect_success 'checkout to detach HEAD' '
 	git config advice.detachedHead true &&
 	git checkout -f renamer && git clean -f &&
-	GIT_TEST_GETTEXT_POISON= git checkout renamer^ 2>messages &&
+	GIT_TEST_GETTEXT_POISON=false git checkout renamer^ 2>messages &&
 	grep "HEAD is now at 7329388" messages &&
 	test_line_count -gt 1 messages &&
 	H=$(git rev-parse --verify HEAD) &&
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 43cf313a1c..75512c3403 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1706,7 +1706,7 @@ test_expect_success 'sourcing the completion script clears cached commands' '
 '
 
 test_expect_success 'sourcing the completion script clears cached merge strategies' '
-	GIT_TEST_GETTEXT_POISON= &&
+	GIT_TEST_GETTEXT_POISON=false &&
 	__git_compute_merge_strategies &&
 	verbose test -n "$__git_merge_strategies" &&
 	. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 4b346467df..ed5d69dfe5 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1443,11 +1443,9 @@ then
 	unset GIT_TEST_GETTEXT_POISON_ORIG
 fi
 
-# Can we rely on git's output in the C locale?
-if test -z "$GIT_TEST_GETTEXT_POISON"
-then
-	test_set_prereq C_LOCALE_OUTPUT
-fi
+test_lazy_prereq C_LOCALE_OUTPUT '
+	! git env--helper --type=bool --default=0 --exit-code GIT_TEST_GETTEXT_POISON
+'
 
 if test -z "$GIT_TEST_CHECK_CACHE_TREE"
 then

From 423b05e102711f2875d47c92b3bf613fda8fe226 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:10 +0200
Subject: [PATCH 6/9] tests README: re-flow a previously changed paragraph
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

A previous change to the "GIT_TEST_GETTEXT_POISON" variable left this
paragraph needing to be re-flowed. Let's do that in this separate
change to make it easy to see that there's no change here when viewed
with "--word-diff".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/README | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/t/README b/t/README
index 9a131f472e..072c9854d1 100644
--- a/t/README
+++ b/t/README
@@ -344,10 +344,10 @@ refactor to deal with it. The "SYMLINKS" prerequisite is currently
 excluded as so much relies on it, but this might change in the future.
 
 GIT_TEST_GETTEXT_POISON=<boolean> turns all strings marked for
-translation into gibberish if true. Used for
-spotting those tests that need to be marked with a C_LOCALE_OUTPUT
-prerequisite when adding more strings for translation. See "Testing
-marked strings" in po/README for details.
+translation into gibberish if true. Used for spotting those tests that
+need to be marked with a C_LOCALE_OUTPUT prerequisite when adding more
+strings for translation. See "Testing marked strings" in po/README for
+details.
 
 GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
 test suite. Accept any boolean values that are accepted by git-config.

From 3b072c577ba594a9fb4ae9426409f1caadafcb08 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:11 +0200
Subject: [PATCH 7/9] tests: replace test_tristate with "git env--helper"
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The test_tristate helper introduced in 83d842dc8c ("tests: turn on
network daemon tests by default", 2014-02-10) can now be better
implemented with "git env--helper" to give the variables in question
the standard boolean behavior.

The reason for the "tristate" was to have all of false/true/auto,
where "auto" meant either "false" or "true" depending on what the
fallback was. With the --default option to "git env--helper" we can
simply have e.g. GIT_TEST_HTTPD where we know if it's true because the
user asked explicitly ("true"), or true implicitly ("auto").

This breaks backwards compatibility for explicitly setting "auto" for
these variables, but I don't think anyone cares. That was always
intended to be internal.

This means the test_normalize_bool() code in test-lib-functions.sh
goes away in addition to test_tristate(). We still need the
test_skip_or_die() helper, but now it takes the variable name instead
of the value, and uses "git env--bool" to distinguish a default "true"
from an explicit "true" (in those "explicit true" cases we want to
fail the test in question).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/lib-git-daemon.sh     |  7 +++---
 t/lib-git-svn.sh        | 11 +++-----
 t/lib-httpd.sh          | 15 ++++++-----
 t/t5512-ls-remote.sh    |  3 +--
 t/test-lib-functions.sh | 56 ++++++-----------------------------------
 5 files changed, 22 insertions(+), 70 deletions(-)

diff --git a/t/lib-git-daemon.sh b/t/lib-git-daemon.sh
index 7b3407134e..fb8f887080 100644
--- a/t/lib-git-daemon.sh
+++ b/t/lib-git-daemon.sh
@@ -15,8 +15,7 @@
 #
 #	test_done
 
-test_tristate GIT_TEST_GIT_DAEMON
-if test "$GIT_TEST_GIT_DAEMON" = false
+if ! git env--helper --type=bool --default=true --exit-code GIT_TEST_GIT_DAEMON
 then
 	skip_all="git-daemon testing disabled (unset GIT_TEST_GIT_DAEMON to enable)"
 	test_done
@@ -24,7 +23,7 @@ fi
 
 if test_have_prereq !PIPE
 then
-	test_skip_or_die $GIT_TEST_GIT_DAEMON "file system does not support FIFOs"
+	test_skip_or_die GIT_TEST_GIT_DAEMON "file system does not support FIFOs"
 fi
 
 test_set_port LIB_GIT_DAEMON_PORT
@@ -73,7 +72,7 @@ start_git_daemon() {
 		kill "$GIT_DAEMON_PID"
 		wait "$GIT_DAEMON_PID"
 		unset GIT_DAEMON_PID
-		test_skip_or_die $GIT_TEST_GIT_DAEMON \
+		test_skip_or_die GIT_TEST_GIT_DAEMON \
 			"git daemon failed to start"
 	fi
 }
diff --git a/t/lib-git-svn.sh b/t/lib-git-svn.sh
index c1271d6863..5d4ae629e1 100644
--- a/t/lib-git-svn.sh
+++ b/t/lib-git-svn.sh
@@ -69,14 +69,12 @@ svn_cmd () {
 maybe_start_httpd () {
 	loc=${1-svn}
 
-	test_tristate GIT_SVN_TEST_HTTPD
-	case $GIT_SVN_TEST_HTTPD in
-	true)
+	if git env--helper --type=bool --default=false --exit-code GIT_TEST_HTTPD
+	then
 		. "$TEST_DIRECTORY"/lib-httpd.sh
 		LIB_HTTPD_SVN="$loc"
 		start_httpd
-		;;
-	esac
+	fi
 }
 
 convert_to_rev_db () {
@@ -106,8 +104,7 @@ EOF
 }
 
 require_svnserve () {
-	test_tristate GIT_TEST_SVNSERVE
-	if ! test "$GIT_TEST_SVNSERVE" = true
+	if ! git env--helper --type=bool --default=false --exit-code GIT_TEST_SVNSERVE
 	then
 		skip_all='skipping svnserve test. (set $GIT_TEST_SVNSERVE to enable)'
 		test_done
diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index b3cc62bd36..0d985758c6 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -41,15 +41,14 @@ then
 	test_done
 fi
 
-test_tristate GIT_TEST_HTTPD
-if test "$GIT_TEST_HTTPD" = false
+if ! git env--helper --type=bool --default=true --exit-code GIT_TEST_HTTPD
 then
 	skip_all="Network testing disabled (unset GIT_TEST_HTTPD to enable)"
 	test_done
 fi
 
 if ! test_have_prereq NOT_ROOT; then
-	test_skip_or_die $GIT_TEST_HTTPD \
+	test_skip_or_die GIT_TEST_HTTPD \
 		"Cannot run httpd tests as root"
 fi
 
@@ -95,7 +94,7 @@ GIT_TRACE=$GIT_TRACE; export GIT_TRACE
 
 if ! test -x "$LIB_HTTPD_PATH"
 then
-	test_skip_or_die $GIT_TEST_HTTPD "no web server found at '$LIB_HTTPD_PATH'"
+	test_skip_or_die GIT_TEST_HTTPD "no web server found at '$LIB_HTTPD_PATH'"
 fi
 
 HTTPD_VERSION=$($LIB_HTTPD_PATH -v | \
@@ -107,19 +106,19 @@ then
 	then
 		if ! test $HTTPD_VERSION -ge 2
 		then
-			test_skip_or_die $GIT_TEST_HTTPD \
+			test_skip_or_die GIT_TEST_HTTPD \
 				"at least Apache version 2 is required"
 		fi
 		if ! test -d "$DEFAULT_HTTPD_MODULE_PATH"
 		then
-			test_skip_or_die $GIT_TEST_HTTPD \
+			test_skip_or_die GIT_TEST_HTTPD \
 				"Apache module directory not found"
 		fi
 
 		LIB_HTTPD_MODULE_PATH="$DEFAULT_HTTPD_MODULE_PATH"
 	fi
 else
-	test_skip_or_die $GIT_TEST_HTTPD \
+	test_skip_or_die GIT_TEST_HTTPD \
 		"Could not identify web server at '$LIB_HTTPD_PATH'"
 fi
 
@@ -184,7 +183,7 @@ start_httpd() {
 	if test $? -ne 0
 	then
 		cat "$HTTPD_ROOT_PATH"/error.log >&4 2>/dev/null
-		test_skip_or_die $GIT_TEST_HTTPD "web server setup failed"
+		test_skip_or_die GIT_TEST_HTTPD "web server setup failed"
 	fi
 }
 
diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
index e3c4a48c85..43e1d8d4d2 100755
--- a/t/t5512-ls-remote.sh
+++ b/t/t5512-ls-remote.sh
@@ -267,8 +267,7 @@ test_expect_success 'ls-remote --symref omits filtered-out matches' '
 '
 
 test_lazy_prereq GIT_DAEMON '
-	test_tristate GIT_TEST_GIT_DAEMON &&
-	test "$GIT_TEST_GIT_DAEMON" != false
+	git env--helper --type=bool --default=true --exit-code GIT_TEST_GIT_DAEMON
 '
 
 # This test spawns a daemon, so run it only if the user would be OK with
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 0367cec5fd..527508c350 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1035,62 +1035,20 @@ perl () {
 	command "$PERL_PATH" "$@" 2>&7
 } 7>&2 2>&4
 
-# Is the value one of the various ways to spell a boolean true/false?
-test_normalize_bool () {
-	git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
-}
-
-# Given a variable $1, normalize the value of it to one of "true",
-# "false", or "auto" and store the result to it.
-#
-#     test_tristate GIT_TEST_HTTPD
-#
-# A variable set to an empty string is set to 'false'.
-# A variable set to 'false' or 'auto' keeps its value.
-# Anything else is set to 'true'.
-# An unset variable defaults to 'auto'.
-#
-# The last rule is to allow people to set the variable to an empty
-# string and export it to decline testing the particular feature
-# for versions both before and after this change.  We used to treat
-# both unset and empty variable as a signal for "do not test" and
-# took any non-empty string as "please test".
-
-test_tristate () {
-	if eval "test x\"\${$1+isset}\" = xisset"
-	then
-		# explicitly set
-		eval "
-			case \"\$$1\" in
-			'')	$1=false ;;
-			auto)	;;
-			*)	$1=\$(test_normalize_bool \$$1 || echo true) ;;
-			esac
-		"
-	else
-		eval "$1=auto"
-	fi
-}
-
 # Exit the test suite, either by skipping all remaining tests or by
-# exiting with an error. If "$1" is "auto", we then we assume we were
-# opportunistically trying to set up some tests and we skip. If it is
-# "true", then we report a failure.
+# exiting with an error. If our prerequisite variable $1 falls back
+# on a default assume we were opportunistically trying to set up some
+# tests and we skip. If it is explicitly "true", then we report a failure.
 #
 # The error/skip message should be given by $2.
 #
 test_skip_or_die () {
-	case "$1" in
-	auto)
+	if ! git env--helper --mode-bool --variable=$1 --default=0 --exit-code --quiet
+	then
 		skip_all=$2
 		test_done
-		;;
-	true)
-		error "$2"
-		;;
-	*)
-		error "BUG: test tristate is '$1' (real error: $2)"
-	esac
+	fi
+	error "$2"
 }
 
 # The following mingw_* functions obey POSIX shell syntax, but are actually

From c740039921528198efa21f9cf6ccb849e74164c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>
Date: Fri, 21 Jun 2019 12:18:12 +0200
Subject: [PATCH 8/9] tests: make GIT_TEST_FAIL_PREREQS a boolean
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Change the GIT_TEST_FAIL_PREREQS variable from being "non-empty?" to
being a more standard boolean variable. I recently added the variable
in dfe1a17df9 ("tests: add a special setup where prerequisites fail",
2019-05-13), having to add another "non-empty?" special-case is what
prompted me to write the "git env--helper" utility being used here.

Converting this one is a bit tricky since we use it so early and
frequently in the guts of the test code itself, so let's set a
GIT_TEST_FAIL_PREREQS_INTERNAL which can be tested with the old "test
-n" for the purposes of the shell code, and change the user-exposed
and documented GIT_TEST_FAIL_PREREQS variable to a boolean.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/README                |  2 +-
 t/t0000-basic.sh        | 10 +++++-----
 t/test-lib-functions.sh |  4 ++--
 t/test-lib.sh           | 23 +++++++++++++++++++----
 4 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/t/README b/t/README
index 072c9854d1..60d5b77bcc 100644
--- a/t/README
+++ b/t/README
@@ -334,7 +334,7 @@ that cannot be easily covered by a few specific test cases. These
 could be enabled by running the test suite with correct GIT_TEST_
 environment set.
 
-GIT_TEST_FAIL_PREREQS<non-empty?> fails all prerequisites. This is
+GIT_TEST_FAIL_PREREQS=<boolean> fails all prerequisites. This is
 useful for discovering issues with the tests where say a later test
 implicitly depends on an optional earlier test.
 
diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index 31de7e90f3..e89438e619 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -726,7 +726,7 @@ donthaveit=yes
 test_expect_success DONTHAVEIT 'unmet prerequisite causes test to be skipped' '
 	donthaveit=no
 '
-if test -z "$GIT_TEST_FAIL_PREREQS" -a $haveit$donthaveit != yesyes
+if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $haveit$donthaveit != yesyes
 then
 	say "bug in test framework: prerequisite tags do not work reliably"
 	exit 1
@@ -747,7 +747,7 @@ donthaveiteither=yes
 test_expect_success DONTHAVEIT,HAVEIT 'unmet prerequisites causes test to be skipped' '
 	donthaveiteither=no
 '
-if test -z "$GIT_TEST_FAIL_PREREQS" -a $haveit$donthaveit$donthaveiteither != yesyesyes
+if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $haveit$donthaveit$donthaveiteither != yesyesyes
 then
 	say "bug in test framework: multiple prerequisite tags do not work reliably"
 	exit 1
@@ -763,7 +763,7 @@ test_expect_success !LAZY_TRUE 'missing lazy prereqs skip tests' '
 	donthavetrue=no
 '
 
-if test -z "$GIT_TEST_FAIL_PREREQS" -a "$havetrue$donthavetrue" != yesyes
+if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a "$havetrue$donthavetrue" != yesyes
 then
 	say 'bug in test framework: lazy prerequisites do not work'
 	exit 1
@@ -779,7 +779,7 @@ test_expect_success LAZY_FALSE 'missing negative lazy prereqs will skip' '
 	havefalse=no
 '
 
-if test -z "$GIT_TEST_FAIL_PREREQS" -a "$nothavefalse$havefalse" != yesyes
+if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a "$nothavefalse$havefalse" != yesyes
 then
 	say 'bug in test framework: negative lazy prerequisites do not work'
 	exit 1
@@ -790,7 +790,7 @@ test_expect_success 'tests clean up after themselves' '
 	test_when_finished clean=yes
 '
 
-if test -z "$GIT_TEST_FAIL_PREREQS" -a $clean != yes
+if test -z "$GIT_TEST_FAIL_PREREQS_INTERNAL" -a $clean != yes
 then
 	say "bug in test framework: basic cleanup command does not work reliably"
 	exit 1
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 527508c350..1cd0655f96 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -309,7 +309,7 @@ test_unset_prereq () {
 }
 
 test_set_prereq () {
-	if test -n "$GIT_TEST_FAIL_PREREQS"
+	if test -n "$GIT_TEST_FAIL_PREREQS_INTERNAL"
 	then
 		case "$1" in
 		# The "!" case is handled below with
@@ -1043,7 +1043,7 @@ perl () {
 # The error/skip message should be given by $2.
 #
 test_skip_or_die () {
-	if ! git env--helper --mode-bool --variable=$1 --default=0 --exit-code --quiet
+	if ! git env--helper --type=bool --default=false --exit-code $1
 	then
 		skip_all=$2
 		test_done
diff --git a/t/test-lib.sh b/t/test-lib.sh
index ed5d69dfe5..1af4e50653 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1389,6 +1389,25 @@ yes () {
 	done
 }
 
+# The GIT_TEST_FAIL_PREREQS code hooks into test_set_prereq(), and
+# thus needs to be set up really early, and set an internal variable
+# for convenience so the hot test_set_prereq() codepath doesn't need
+# to call "git env--helper". Only do that work if needed by seeing if
+# GIT_TEST_FAIL_PREREQS is set at all.
+GIT_TEST_FAIL_PREREQS_INTERNAL=
+if test -n "$GIT_TEST_FAIL_PREREQS"
+then
+	if git env--helper --type=bool --default=0 --exit-code GIT_TEST_FAIL_PREREQS
+	then
+		GIT_TEST_FAIL_PREREQS_INTERNAL=true
+		test_set_prereq FAIL_PREREQS
+	fi
+else
+	test_lazy_prereq FAIL_PREREQS '
+		git env--helper --type=bool --default=0 --exit-code GIT_TEST_FAIL_PREREQS
+	'
+fi
+
 # Fix some commands on Windows
 uname_s=$(uname -s)
 case $uname_s in
@@ -1605,7 +1624,3 @@ test_lazy_prereq SHA1 '
 test_lazy_prereq REBASE_P '
 	test -z "$GIT_TEST_SKIP_REBASE_P"
 '
-
-test_lazy_prereq FAIL_PREREQS '
-	test -n "$GIT_TEST_FAIL_PREREQS"
-'

From 08a8ac88d868f3206e8faf0df2502ebc18925c33 Mon Sep 17 00:00:00 2001
From: Ramsay Jones <ramsay@ramsayjones.plus.com>
Date: Thu, 11 Jul 2019 18:06:13 +0100
Subject: [PATCH 9/9] env--helper: mark a file-local symbol as static

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/env--helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/env--helper.c b/builtin/env--helper.c
index 1083c0f707..23c214fff6 100644
--- a/builtin/env--helper.c
+++ b/builtin/env--helper.c
@@ -7,7 +7,7 @@ static char const * const env__helper_usage[] = {
 	NULL
 };
 
-enum {
+static enum {
 	ENV_HELPER_TYPE_BOOL = 1,
 	ENV_HELPER_TYPE_ULONG
 } cmdmode = 0;