common: support custom repository extensionsethomson/extensions

Allow users to specify additional repository extensions that they want
to support.  For example, callers can specify that they support
`preciousObjects` and then may open repositories that support
`extensions.preciousObjects`.

Similarly, callers may opt out of supporting extensions that the library
itself supports.

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/core/opts.c b/tests/core/opts.c
index 72408cbe8..e8f65d510 100644
--- a/tests/core/opts.c
+++ b/tests/core/opts.c
@@ -1,6 +1,11 @@
 #include "clar_libgit2.h"
 #include "cache.h"
 
+void test_core_opts__cleanup(void)
+{
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, NULL, 0));
+}
+
 void test_core_opts__readwrite(void)
 {
 	size_t old_val = 0;
@@ -23,3 +28,44 @@ void test_core_opts__invalid_option(void)
 	cl_git_fail(git_libgit2_opts(-1, "foobar"));
 }
 
+void test_core_opts__extensions_query(void)
+{
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 1);
+	cl_assert_equal_s("noop", out.strings[0]);
+
+	git_strarray_dispose(&out);
+}
+
+void test_core_opts__extensions_add(void)
+{
+	const char *in[] = { "foo" };
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, in, ARRAY_SIZE(in)));
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 2);
+	cl_assert_equal_s("noop", out.strings[0]);
+	cl_assert_equal_s("foo", out.strings[1]);
+
+	git_strarray_dispose(&out);
+}
+
+void test_core_opts__extensions_remove(void)
+{
+	const char *in[] = { "bar", "!negate", "!noop", "baz" };
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, in, ARRAY_SIZE(in)));
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 2);
+	cl_assert_equal_s("bar", out.strings[0]);
+	cl_assert_equal_s("baz", out.strings[1]);
+
+	git_strarray_dispose(&out);
+}