[PATCH] Disallow downloading disabled snapshot formats

[cgit at cryptocrack.de (Lukas Fleischer)]

We did only display enabled snapshot formats but we did not prevent from
downloading disabled formats when requested. Fix this by adding an
appropriate check.

Also, add a test case that checks whether downloading disabled snapshot
formats is denied, as expected.

Signed-off-by: Lukas Fleischer <cgit at cryptocrack.de>
---
 tests/t0107-snapshot.sh | 5 +++++
 ui-snapshot.c           | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/t0107-snapshot.sh b/tests/t0107-snapshot.sh
index 6cf7aaa..01e8d22 100755
--- a/tests/t0107-snapshot.sh
+++ b/tests/t0107-snapshot.sh
@@ -79,4 +79,9 @@ test_expect_success UNZIP 'verify unzipped file-5' '
 	test_line_count = 1 master/file-5
 '
 
+test_expect_success 'try to download a disabled snapshot format' '
+	cgit_url "foo/snapshot/master.tar.xz" |
+	grep "Unsupported snapshot format"
+'
+
 test_done
diff --git a/ui-snapshot.c b/ui-snapshot.c
index 8f82119..ab20a4a 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -205,7 +205,7 @@ void cgit_print_snapshot(const char *head, const char *hex,
 	}
 
 	f = get_format(filename);
-	if (!f) {
+	if (!f || (snapshots & f->bit) == 0) {
 		show_error("Unsupported snapshot format: %s", filename);
 		return;
 	}
-- 
1.8.5.2