git: add --no-includes top-level option

The previous change added a GIT_CONFIG_INCLUDES=0 override in the
environment, similar to GIT_ADVICE=0. Follow the same model as
--no-advice to add a --no-includes option to the top-level Git options.

Signed-off-by: Derrick Stolee <stolee@gmail.com>

Author: derrickstolee

Documentation/git.adoc

@@ -12,7 +12,7 @@ SYNOPSIS
 'git' [-v | --version] [-h | --help] [-C <path>] [-c <name>=<value>]
     [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
     [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--no-lazy-fetch]
-    [--no-optional-locks] [--no-advice] [--bare] [--git-dir=<path>]
+    [--no-optional-locks] [--no-advice] [--no-includes] [--bare] [--git-dir=<path>]
     [--work-tree=<path>] [--namespace=<name>] [--config-env=<name>=<envvar>]
     <command> [<args>]
 
@@ -194,6 +194,10 @@ If you just want to run git as if it was started in `<path>` then use
 --no-advice::
 	Disable all advice hints from being printed.
 
+--no-includes::
+	Disable all `include.path` and `includeIf.*` config directives.
+	See linkgit::git-config[1] for more information.
+
 --literal-pathspecs::
 	Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 	This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment

git.c

@@ -40,7 +40,7 @@ const char git_usage_string[] =
 	N_("git [-v | --version] [-h | --help] [-C <path>] [-c <name>=<value>]\n"
 	   "           [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
 	   "           [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--no-lazy-fetch]\n"
-	   "           [--no-optional-locks] [--no-advice] [--bare] [--git-dir=<path>]\n"
+	   "           [--no-optional-locks] [--no-advice] [--no-includes] [--bare] [--git-dir=<path>]\n"
 	   "           [--work-tree=<path>] [--namespace=<name>] [--config-env=<name>=<envvar>]\n"
 	   "           <command> [<args>]");
 
@@ -354,6 +354,10 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 			setenv(GIT_ADVICE_ENVIRONMENT, "0", 1);
 			if (envchanged)
 				*envchanged = 1;
+		} else if (!strcmp(cmd, "--no-includes")) {
+			setenv(CONFIG_INCLUDES_ENVIRONMENT, "0", 1);
+			if (envchanged)
+				*envchanged = 1;
 		} else {
 			fprintf(stderr, _("unknown option: %s\n"), cmd);
 			usage(git_usage_string);

t/t1305-config-include.sh

@@ -409,8 +409,11 @@ test_expect_success 'GIT_CONFIG_INCLUDES=0 disables include.path and includeIf'
 		git config get foo.baz &&
 		test_must_fail env GIT_CONFIG_INCLUDES=0 git config get foo.bar &&
 		test_must_fail env GIT_CONFIG_INCLUDES=0 git config get foo.baz &&
+		test_must_fail git --no-includes config get foo.bar &&
+		test_must_fail git --no-includes config get foo.baz &&
 		git config get --includes foo.bar &&
-		test_must_fail env GIT_CONFIG_INCLUDES=0 git config get --includes foo.bar
+		test_must_fail env GIT_CONFIG_INCLUDES=0 git config get --includes foo.bar &&
+		test_must_fail git --no-includes config get --includes foo.bar
 	)
 '
 
@@ -423,7 +426,8 @@ test_expect_success 'GIT_CONFIG_INCLUDES=0 blocks included alias override' '
 		git config set include.path config.inc &&
 		git config set -f .git/config.inc alias.test status &&
 		git test &&
-		test_must_fail env GIT_CONFIG_INCLUDES=0 git test
+		test_must_fail env GIT_CONFIG_INCLUDES=0 git test &&
+		test_must_fail git --no-includes test
 	)
 '