win32: tests around handling forbidden paths

Introduce a repository that contains some paths that were illegal
on PC-DOS circa 1981 (like `aux`, `con`, `com1`) and that in a
bizarre fit of retrocomputing, remain illegal on some "modern"
computers, despite being "new technology".

Introduce some aspirational tests that suggest that we should be
able to cope with trees and indexes that contain paths that
would be illegal on the filesystem, so that we can at least diff
them.  Further ensure that checkout will not write a repository
with forbidden paths.

13 files changed, 206 insertions, 0 deletions

diff --git a/tests/resources/win32-forbidden/.gitted/HEAD b/tests/resources/win32-forbidden/.gitted/HEAD
new file mode 100644
index 000000000..cb089cd89
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/master
diff --git a/tests/resources/win32-forbidden/.gitted/config b/tests/resources/win32-forbidden/.gitted/config
new file mode 100644
index 000000000..6c9406b7d
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/config
@@ -0,0 +1,7 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true
+	precomposeunicode = true
diff --git a/tests/resources/win32-forbidden/.gitted/index b/tests/resources/win32-forbidden/.gitted/index
new file mode 100644
index 000000000..1202dd9f4
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/index
diff --git a/tests/resources/win32-forbidden/.gitted/info/exclude b/tests/resources/win32-forbidden/.gitted/info/exclude
new file mode 100644
index 000000000..a5196d1be
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/info/exclude
@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
diff --git a/tests/resources/win32-forbidden/.gitted/objects/10/68072702a28a82c78902cf5bf82c3864cf4356 b/tests/resources/win32-forbidden/.gitted/objects/10/68072702a28a82c78902cf5bf82c3864cf4356
new file mode 100644
index 000000000..2d3b31adc
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/10/68072702a28a82c78902cf5bf82c3864cf4356
diff --git a/tests/resources/win32-forbidden/.gitted/objects/17/6a458f94e0ea5272ce67c36bf30b6be9caf623 b/tests/resources/win32-forbidden/.gitted/objects/17/6a458f94e0ea5272ce67c36bf30b6be9caf623
new file mode 100644
index 000000000..ef8316670
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/17/6a458f94e0ea5272ce67c36bf30b6be9caf623
diff --git a/tests/resources/win32-forbidden/.gitted/objects/2d/7445a749d25269f32724aa621cb70b196bcc40 b/tests/resources/win32-forbidden/.gitted/objects/2d/7445a749d25269f32724aa621cb70b196bcc40
new file mode 100644
index 000000000..baddb1fc6
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/2d/7445a749d25269f32724aa621cb70b196bcc40
diff --git a/tests/resources/win32-forbidden/.gitted/objects/34/96991d72d500af36edef68bbfcccd1661d88db b/tests/resources/win32-forbidden/.gitted/objects/34/96991d72d500af36edef68bbfcccd1661d88db
new file mode 100644
index 000000000..71b6172c6
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/34/96991d72d500af36edef68bbfcccd1661d88db
@@ -0,0 +1,3 @@
+x
���
+!�[�w����hӢ}/�8�B*8N�~�@gu��՜S�	͡7�a�
+�f�2��"s
e.�%��Q	��ؽ��຾m[�k�j���m�G�q_N��3LBJŔF
G:B���������VRO�	ͿҖj!��=�
\ No newline at end of file
diff --git a/tests/resources/win32-forbidden/.gitted/objects/8f/45aad6f23b9509f8786c617e19c127ae76609a b/tests/resources/win32-forbidden/.gitted/objects/8f/45aad6f23b9509f8786c617e19c127ae76609a
new file mode 100644
index 000000000..8bcd980c4
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/8f/45aad6f23b9509f8786c617e19c127ae76609a
@@ -0,0 +1,2 @@
+x
�A
+� �֝�/k�.� ]`����h޾�"=�˕�e*���U��+��M�%���O4�c�˱���
\ No newline at end of file
diff --git a/tests/resources/win32-forbidden/.gitted/objects/da/623abd956bb2fd8052c708c7ed43f05d192d37 b/tests/resources/win32-forbidden/.gitted/objects/da/623abd956bb2fd8052c708c7ed43f05d192d37
new file mode 100644
index 000000000..923462306
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/da/623abd956bb2fd8052c708c7ed43f05d192d37
diff --git a/tests/resources/win32-forbidden/.gitted/objects/ea/c7621a652e5261ef1c1d3e7ae31b0d84fcbaba b/tests/resources/win32-forbidden/.gitted/objects/ea/c7621a652e5261ef1c1d3e7ae31b0d84fcbaba
new file mode 100644
index 000000000..32b3f02ec
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/objects/ea/c7621a652e5261ef1c1d3e7ae31b0d84fcbaba
@@ -0,0 +1,3 @@
+x
��M
+B!F��;BoW}BD��ۀ��
+>_m?�Bg�q���VJ �=F�����dJT�qD�d�B��N�'��6R�p
��S+k�p�����G����rAR*Tz!��	�vVG���n5�l_��;��U�>H
\ No newline at end of file
diff --git a/tests/resources/win32-forbidden/.gitted/refs/heads/master b/tests/resources/win32-forbidden/.gitted/refs/heads/master
new file mode 100644
index 000000000..47fce0fe3
--- /dev/null
+++ b/tests/resources/win32-forbidden/.gitted/refs/heads/master
@@ -0,0 +1 @@
+3496991d72d500af36edef68bbfcccd1661d88db
diff --git a/tests/win32/forbidden.c b/tests/win32/forbidden.c
new file mode 100644
index 000000000..e02f41179
--- /dev/null
+++ b/tests/win32/forbidden.c
@@ -0,0 +1,183 @@
+#include "clar_libgit2.h"
+
+#include "repository.h"
+#include "buffer.h"
+#include "submodule.h"
+
+static const char *repo_name = "win32-forbidden";
+static git_repository *repo;
+
+void test_win32_forbidden__initialize(void)
+{
+	repo = cl_git_sandbox_init(repo_name);
+}
+
+void test_win32_forbidden__cleanup(void)
+{
+	cl_git_sandbox_cleanup();
+}
+
+void test_win32_forbidden__can_open_index(void)
+{
+	git_index *index;
+	cl_git_pass(git_repository_index(&index, repo));
+	cl_assert_equal_i(7, git_index_entrycount(index));
+
+	/* ensure we can even write the unmodified index */
+	cl_git_pass(git_index_write(index));
+
+	git_index_free(index);
+}
+
+void test_win32_forbidden__can_add_forbidden_filename_with_entry(void)
+{
+	git_index *index;
+	git_index_entry entry = {{0}};
+
+	cl_git_pass(git_repository_index(&index, repo));
+
+	entry.path = "aux";
+	entry.mode = GIT_FILEMODE_BLOB;
+	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37");
+
+	cl_git_pass(git_index_add(index, &entry));
+
+	git_index_free(index);
+}
+
+void test_win32_forbidden__cannot_add_dot_git_even_with_entry(void)
+{
+	git_index *index;
+	git_index_entry entry = {{0}};
+
+	cl_git_pass(git_repository_index(&index, repo));
+
+	entry.path = "foo/.git";
+	entry.mode = GIT_FILEMODE_BLOB;
+	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37");
+
+	cl_git_fail(git_index_add(index, &entry));
+
+	git_index_free(index);
+}
+
+void test_win32_forbidden__cannot_add_forbidden_filename_from_filesystem(void)
+{
+	git_index *index;
+
+	/* since our function calls are very low-level, we can create `aux.`,
+	 * but we should not be able to add it to the index
+	 */
+	cl_git_pass(git_repository_index(&index, repo));
+	cl_git_write2file("win32-forbidden/aux.", "foo\n", 4, O_RDWR | O_CREAT, 0666);
+
+#ifdef GIT_WIN32
+	cl_git_fail(git_index_add_bypath(index, "aux."));
+#else
+	cl_git_pass(git_index_add_bypath(index, "aux."));
+#endif
+
+	cl_must_pass(p_unlink("win32-forbidden/aux."));
+	git_index_free(index);
+}
+
+static int dummy_submodule_cb(
+	git_submodule *sm, const char *name, void *payload)
+{
+	GIT_UNUSED(sm);
+	GIT_UNUSED(name);
+	GIT_UNUSED(payload);
+	return 0;
+}
+
+void test_win32_forbidden__can_diff_tree_to_index(void)
+{
+	git_diff *diff;
+	git_tree *tree;
+
+	cl_git_pass(git_repository_head_tree(&tree, repo));
+	cl_git_pass(git_diff_tree_to_index(&diff, repo, tree, NULL, NULL));
+	cl_assert_equal_i(0, git_diff_num_deltas(diff));
+	git_diff_free(diff);
+	git_tree_free(tree);
+}
+
+void test_win32_forbidden__can_diff_tree_to_tree(void)
+{
+	git_diff *diff;
+	git_tree *tree;
+
+	cl_git_pass(git_repository_head_tree(&tree, repo));
+	cl_git_pass(git_diff_tree_to_tree(&diff, repo, tree, tree, NULL));
+	cl_assert_equal_i(0, git_diff_num_deltas(diff));
+	git_diff_free(diff);
+	git_tree_free(tree);
+}
+
+void test_win32_forbidden__can_diff_index_to_workdir(void)
+{
+	git_index *index;
+	git_diff *diff;
+	const git_diff_delta *delta;
+	git_tree *tree;
+	size_t i;
+
+	cl_git_pass(git_repository_index(&index, repo));
+	cl_git_pass(git_repository_head_tree(&tree, repo));
+	cl_git_pass(git_diff_index_to_workdir(&diff, repo, index, NULL));
+
+	for (i = 0; i < git_diff_num_deltas(diff); i++) {
+		delta = git_diff_get_delta(diff, i);
+		cl_assert_equal_i(GIT_DELTA_DELETED, delta->status);
+	}
+
+	git_diff_free(diff);
+	git_tree_free(tree);
+	git_index_free(index);
+}
+
+void test_win32_forbidden__checking_out_forbidden_index_fails(void)
+{
+#ifdef GIT_WIN32
+	git_index *index;
+	git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
+	git_diff *diff;
+	const git_diff_delta *delta;
+	git_tree *tree;
+	size_t num_deltas, i;
+
+	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
+
+	cl_git_pass(git_repository_index(&index, repo));
+	cl_git_fail(git_checkout_index(repo, index, &opts));
+
+	cl_git_pass(git_repository_head_tree(&tree, repo));
+	cl_git_pass(git_diff_index_to_workdir(&diff, repo, index, NULL));
+
+	num_deltas = git_diff_num_deltas(diff);
+
+	cl_assert(num_deltas > 0);
+
+	for (i = 0; i < num_deltas; i++) {
+		delta = git_diff_get_delta(diff, i);
+		cl_assert_equal_i(GIT_DELTA_DELETED, delta->status);
+	}
+
+	git_diff_free(diff);
+	git_tree_free(tree);
+	git_index_free(index);
+#endif
+}
+
+void test_win32_forbidden__can_query_submodules(void)
+{
+	cl_git_pass(git_submodule_foreach(repo, dummy_submodule_cb, NULL));
+}
+
+void test_win32_forbidden__can_blame_file(void)
+{
+	git_blame *blame;
+
+	cl_git_pass(git_blame_file(&blame, repo, "aux", NULL));
+	git_blame_free(blame);
+}