checkout tests: nasty symlinks

Symbolic links that abuse case insensitivity to write into .git.

tests/checkout/nasty.c

@@ -23,7 +23,29 @@ void test_checkout_nasty__cleanup(void)
 	cl_git_sandbox_cleanup();
 }
 
-void test_checkout_fails(const char *refname, const char *filename)
+static void test_checkout_passes(const char *refname, const char *filename)
+{
+	git_oid commit_id;
+	git_commit *commit;
+	git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
+	git_buf path = GIT_BUF_INIT;
+
+	cl_git_pass(git_buf_joinpath(&path, repo_name, filename));
+
+	cl_git_pass(git_reference_name_to_id(&commit_id, repo, refname));
+	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
+
+	opts.checkout_strategy = GIT_CHECKOUT_FORCE |
+		GIT_CHECKOUT_DONT_UPDATE_INDEX;
+
+	cl_git_pass(git_checkout_tree(repo, (const git_object *)commit, &opts));
+	cl_assert(!git_path_exists(path.ptr));
+
+	git_commit_free(commit);
+	git_buf_free(&path);
+}
+
+static void test_checkout_fails(const char *refname, const char *filename)
 {
 	git_oid commit_id;
 	git_commit *commit;
@@ -323,3 +345,19 @@ void test_checkout_nasty__honors_core_protectntfs(void)
 	test_checkout_fails("refs/heads/dot_git_dot", ".git/foobar");
 	test_checkout_fails("refs/heads/git_tilde1", ".git/foobar");
 }
+
+void test_checkout_nasty__symlink1(void)
+{
+	test_checkout_passes("refs/heads/symlink1", ".git/foobar");
+}
+
+void test_checkout_nasty__symlink2(void)
+{
+	test_checkout_passes("refs/heads/symlink2", ".git/foobar");
+}
+
+void test_checkout_nasty__symlink3(void)
+{
+	test_checkout_passes("refs/heads/symlink3", ".git/foobar");
+}
+

tests/resources/nasty/.gitted/objects/1b/31d55e0c53efbea6c670ece9057b76b5822eea

@@ -1,2 +0,0 @@
-x
Ѕ<>a
-!<14>ћэ)оZ|іt"іO'Ј<0B>>1Шз<>Н}н љ5ѓ
Ь<>ZЪ­КУЎ7ffV<66>)J<>CЄ9Y%UR<18>N~fc­gўйsmp<6D>/п"\s-k}Р<>§И<C2A7>ПХ/MЁ<4D> ЁqЄШьЅ<D18C>R:Ю;џ9#.wПцmzИ@Й

tests/resources/nasty/.gitted/objects/4d/83272d0d372e1232ddc4ff3260d76fdfa2015a

@@ -0,0 +1,2 @@
+x
¥<>K
+1D]ç}
¥“ÉDÜx/<2F>OÃNH"2·woà®ê=¨Š5çe€@}<18>L<%´AD“Ì„VºI:%Ir§IDPÇüs̵Á-½|KpŸkîµÀ™vúIWúŠ_;Åš/À¥@Ç-WGTˆl§ûù ?gXñ}lзêºDX—ò`oÔ™Dù

tests/resources/nasty/.gitted/objects/9d/5898503adc01d763e279ac8fcefbe865b19031

@@ -0,0 +1,4 @@
+x
¥O[Â ô›Sì4R
+Icüñz

+Û´±t
bÔÛK<C39B>7ðk^ÉL&pJS
%qS2ô<>Tô=5­1vo•4Ñ5ƒt®‚÷zˆºu­þQFÎpŠOŸ#\FNw^ £ê®ìHßà§v<C2A7>Ó
¤V袶°ÅQT·Žú³Fœß©çy
+0OËèu›yý$>›…Fû

tests/resources/nasty/.gitted/objects/cf/6fcf8cdf7e8d4cda3b11b0ba02d0d5125fbbd7

@@ -0,0 +1,2 @@
+x
¥<>]
+Â0„}Î)öJ²m“Šøâ	ôùÙÐ`Ó•QoooàÛÌ70ÃxÎ9@%7e%kúh0ÒÇèœQAG­i­5èµF†^
ÂÞËÄ+Ãî
Îç/0R¥u oðs;ÏyªE…ºÃ¶<C383>­ì¤•ÖñBÖˆÓ+;ž“‡9- çuæú©o
G‚

tests/resources/nasty/.gitted/refs/heads/symlink1

@@ -0,0 +1 @@
+4d83272d0d372e1232ddc4ff3260d76fdfa2015a

tests/resources/nasty/.gitted/refs/heads/symlink2

@@ -0,0 +1 @@
+9d5898503adc01d763e279ac8fcefbe865b19031

tests/resources/nasty/.gitted/refs/heads/symlink3

@@ -0,0 +1 @@
+cf6fcf8cdf7e8d4cda3b11b0ba02d0d5125fbbd7