reset: add support for GIT_RESET_HARD mode

include/git2/reset.h

@@ -24,6 +24,9 @@ GIT_BEGIN_DECL
  * Specifying a Mixed kind of reset will trigger a Soft reset and the index will
  * be replaced with the content of the commit tree.
  *
+ * Specifying a Hard kind of reset will trigger a Mixed reset and the working
+ * directory will be replaced with the content of the index.
+ *
  * TODO: Implement remaining kinds of resets.
  *
  * @param repo Repository where to perform the reset operation.

include/git2/types.h

@@ -173,6 +173,7 @@ typedef enum {
 typedef enum {
 	GIT_RESET_SOFT = 1,
 	GIT_RESET_MIXED = 2,
+	GIT_RESET_HARD = 3,
 } git_reset_type;
 
 /** Valid modes for index and tree entries. */

src/reset.c

@@ -9,6 +9,7 @@
 #include "commit.h"
 #include "tag.h"
 #include "git2/reset.h"
+#include "git2/checkout.h"
 
 #define ERROR_MSG "Cannot perform reset"
 
@@ -29,7 +30,9 @@ int git_reset(
 	int error = -1;
 
 	assert(repo && target);
-	assert(reset_type == GIT_RESET_SOFT || reset_type == GIT_RESET_MIXED);
+	assert(reset_type == GIT_RESET_SOFT
+		|| reset_type == GIT_RESET_MIXED
+		|| reset_type == GIT_RESET_HARD);
 
 	if (git_object_owner(target) != repo)
 		return reset_error_invalid("The given target does not belong to this repository.");
@@ -73,6 +76,16 @@ int git_reset(
 		goto cleanup;
 	}
 
+	if (reset_type == GIT_RESET_MIXED) {
+		error = 0;
+		goto cleanup;
+	}
+
+	if (git_checkout_index(repo, NULL, NULL, NULL) < 0) {
+		giterr_set(GITERR_INDEX, "%s - Failed to checkout the index.", ERROR_MSG);
+		goto cleanup;
+	}
+
 	error = 0;
 
 cleanup:

tests-clar/reset/hard.c

@@ -0,0 +1,46 @@
+#include "clar_libgit2.h"
+#include "posix.h"
+#include "reset_helpers.h"
+#include "path.h"
+#include "fileops.h"
+
+static git_repository *repo;
+static git_object *target;
+
+void test_reset_hard__initialize(void)
+{
+	repo = cl_git_sandbox_init("status");
+	target = NULL;
+}
+
+void test_reset_hard__cleanup(void)
+{
+	git_object_free(target);
+	cl_git_sandbox_cleanup();
+}
+
+void test_reset_hard__resetting_culls_empty_directories(void)
+{
+	git_buf subdir_path = GIT_BUF_INIT;
+	git_buf subfile_path = GIT_BUF_INIT;
+	git_buf newdir_path = GIT_BUF_INIT;
+
+	cl_git_pass(git_buf_joinpath(&newdir_path, git_repository_workdir(repo), "newdir/"));
+
+	cl_git_pass(git_buf_joinpath(&subfile_path, git_buf_cstr(&newdir_path), "with/nested/file.txt"));
+	cl_git_pass(git_futils_mkpath2file(git_buf_cstr(&subfile_path), 0755));
+	cl_git_mkfile(git_buf_cstr(&subfile_path), "all anew...\n");
+
+	cl_git_pass(git_buf_joinpath(&subdir_path, git_repository_workdir(repo), "subdir/"));
+	cl_assert(git_path_isdir(git_buf_cstr(&subdir_path)) == true);
+
+	retrieve_target_from_oid(&target, repo, "0017bd4ab1ec30440b17bae1680cff124ab5f1f6");
+	cl_git_pass(git_reset(repo, target, GIT_RESET_HARD));
+
+	cl_assert(git_path_isdir(git_buf_cstr(&subdir_path)) == false);
+	cl_assert(git_path_isdir(git_buf_cstr(&newdir_path)) == false);
+
+	git_buf_free(&subdir_path);
+	git_buf_free(&subfile_path);
+	git_buf_free(&newdir_path);
+}