test-dir-iterator: do not assume errno values

diff --git a/t/t5309-pack-delta-cycles.sh b/t/t5309-pack-delta-cycles.sh
index 3e7861b075ffa54f0214aaa349df33be7a113d35..491556dad9792619974851ef255198c5d247af2f 100755 (executable)
--- a/t/t5309-pack-delta-cycles.sh
+++ b/t/t5309-pack-delta-cycles.sh
@@ -4,6 +4,12 @@ test_description='test index-pack handling of delta cycles in packfiles'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-pack.sh
 
+if ! test_have_prereq SHA1
+then
+       skip_all='not using SHA-1 for objects'
+       test_done
+fi
+
 # Two similar-ish objects that we have computed deltas between.
 A=01d7713666f4de822776c7622c10f1b07de280dc
 B=e68fe8129b546b101aee9510c5328e7f21ca1d18