shallow: remove feature flag

The opt mechanism isn't _really_ meant to be for feature flags, and it's
weird to feature flag shallow / unshallow at all.

include/git2/common.h

@@ -224,8 +224,7 @@ typedef enum {
 	GIT_OPT_GET_OWNER_VALIDATION,
 	GIT_OPT_SET_OWNER_VALIDATION,
 	GIT_OPT_GET_HOMEDIR,
-	GIT_OPT_SET_HOMEDIR,
-	GIT_OPT_ENABLE_SHALLOW
+	GIT_OPT_SET_HOMEDIR
 } git_libgit2_opt_t;
 
 /**
@@ -463,9 +462,6 @@ typedef enum {
  *      > to support repositories with the `noop` extension but does want
  *      > to support repositories with the `newext` extension.
  *
- * 	 opts(GIT_OPT_ENABLE_SHALLOW, int enabled)
- *		> Enable or disable shallow clone support completely.
- *
  *   opts(GIT_OPT_GET_OWNER_VALIDATION, int *enabled)
  *      > Gets the owner validation setting for repository
  *      > directories.

src/libgit2/commit.c

@@ -558,9 +558,6 @@ int git_commit__parse_ext(
 				  git_odb_object_size(odb_obj), parse_opts)) < 0)
 		return error;
 
-	if (!git_shallow__enabled)
-		return 0;
-
 	/* Perform necessary grafts */
 	if (git_grafts_get(&graft, repo->grafts, git_odb_object_id(odb_obj)) != 0 &&
 		git_grafts_get(&graft, repo->shallow_grafts, git_odb_object_id(odb_obj)) != 0)

src/libgit2/grafts.c

@@ -12,8 +12,6 @@
 #include "oidarray.h"
 #include "parse.h"
 
-bool git_shallow__enabled = false;
-
 struct git_grafts {
 	/* Map of `git_commit_graft`s */
 	git_oidmap *commits;

src/libgit2/grafts.h

@@ -19,8 +19,6 @@ typedef struct {
 
 typedef struct git_grafts git_grafts;
 
-extern bool git_shallow__enabled;
-
 int git_grafts_new(git_grafts **out);
 int git_grafts_from_file(git_grafts **out, const char *path);
 void git_grafts_free(git_grafts *grafts);

src/libgit2/libgit2.c

@@ -436,10 +436,6 @@ int git_libgit2_opts(int key, ...)
 		error = git_sysdir_set(GIT_SYSDIR_HOME, va_arg(ap, const char *));
 		break;
 
-	case GIT_OPT_ENABLE_SHALLOW:
-		git_shallow__enabled = (va_arg(ap, int) != 0);
-		break;
-
 	default:
 		git_error_set(GIT_ERROR_INVALID, "invalid option key");
 		error = -1;

src/libgit2/repository.c

@@ -1099,7 +1099,7 @@ int git_repository_open_ext(
 	if (error < 0)
 		goto cleanup;
 
-	if (git_shallow__enabled && (error = load_grafts(repo)) < 0)
+	if ((error = load_grafts(repo)) < 0)
 		goto cleanup;
 
 	if ((flags & GIT_REPOSITORY_OPEN_BARE) != 0) {

tests/libgit2/clone/shallow.c

@@ -4,12 +4,10 @@
 
 void test_clone_shallow__initialize(void)
 {
-    cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 1));
 }
 
 void test_clone_shallow__cleanup(void)
 {
-	git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 0);
 }
 
 static int remote_single_branch(git_remote **out, git_repository *repo, const char *name, const char *url, void *payload)

tests/libgit2/grafts/basic.c

@@ -7,13 +7,11 @@ static git_repository *g_repo;
 
 void test_grafts_basic__initialize(void)
 {
-	git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 1);
 	g_repo = cl_git_sandbox_init("grafted.git");
 }
 
 void test_grafts_basic__cleanup(void)
 {
-	git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 0);
 	cl_git_sandbox_cleanup();
 }
 

tests/libgit2/grafts/shallow.c

@@ -7,25 +7,13 @@
 static git_repository *g_repo;
 static git_oid g_shallow_oid;
 
-void test_grafts_shallow__set_feature_flag(void)
-{
-    cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 1));
-}
-
-void test_grafts_shallow__unset_feature_flag(void)
-{
-    cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 0));
-}
-
 void test_grafts_shallow__initialize(void)
 {
-	git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 1);
 	cl_git_pass(git_oid__fromstr(&g_shallow_oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 }
 
 void test_grafts_shallow__cleanup(void)
 {
-	git_libgit2_opts(GIT_OPT_ENABLE_SHALLOW, 0);
 	cl_git_sandbox_cleanup();
 }