Re: [ANNOUNCE] Git v2.23.0-rc0 - Initial test failures on NonStop

[Junio C Hamano <gitster@pobox.com>]

"Randall S. Becker" <rsbecker@nexbridge.com> writes:

> t0066: dir-iterator
>
> Subtest 4 depends on a non-portable error code. ENOENT is not guaranteed ...
> Subtest 5 also depends on a non-portable error code. ENOTDIR is not gua...

Yikes, and sorry.  I've become somewhat complacent after relying on
how good our other reviewers are, pretty much ignored the new code
in fringes like t/helper/, and failed catch an obvious amateurish
mistake like this one.

I do not think of a portable way to map an int ENOENT to a string
"ENOENT", but there are only only two errors test-dir-iterator test
code cares about, so perhaps a patch like the following may be
sufficient.

I wonder if a tool like sparse can help us catch a pattern that
feeds errno to "%d" format.

 t/helper/test-dir-iterator.c | 11 ++++++++++-
 t/t0066-dir-iterator.sh      |  4 ++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/t/helper/test-dir-iterator.c b/t/helper/test-dir-iterator.c
index a5b96cb0dc..c7c30664da 100644
--- a/t/helper/test-dir-iterator.c
+++ b/t/helper/test-dir-iterator.c
@@ -4,6 +4,15 @@
 #include "iterator.h"
 #include "dir-iterator.h"
 
+static const char *error_name(int error_number)
+{
+	switch (error_number) {
+	case ENOENT: return "ENOENT";
+	case ENOTDIR: return "ENOTDIR";
+	default: return "ESOMETHINGELSE";
+	}
+}
+
 /*
  * usage:
  * tool-test dir-iterator [--follow-symlinks] [--pedantic] directory_path
@@ -31,7 +40,7 @@ int cmd__dir_iterator(int argc, const char **argv)
 	diter = dir_iterator_begin(path.buf, flags);
 
 	if (!diter) {
-		printf("dir_iterator_begin failure: %d\n", errno);
+		printf("dir_iterator_begin failure: %s\n", error_name(errno));
 		exit(EXIT_FAILURE);
 	}
 
diff --git a/t/t0066-dir-iterator.sh b/t/t0066-dir-iterator.sh
index 9354d3f1ed..92910e4e6c 100755
--- a/t/t0066-dir-iterator.sh
+++ b/t/t0066-dir-iterator.sh
@@ -55,13 +55,13 @@ test_expect_success 'dir-iterator should list files in the correct order' '
 test_expect_success 'begin should fail upon inexistent paths' '
 	test_must_fail test-tool dir-iterator ./inexistent-path \
 		>actual-inexistent-path-output &&
-	echo "dir_iterator_begin failure: 2" >expected-inexistent-path-output &&
+	echo "dir_iterator_begin failure: ENOENT" >expected-inexistent-path-output &&
 	test_cmp expected-inexistent-path-output actual-inexistent-path-output
 '
 
 test_expect_success 'begin should fail upon non directory paths' '
 	test_must_fail test-tool dir-iterator ./dir/b >actual-non-dir-output &&
-	echo "dir_iterator_begin failure: 20" >expected-non-dir-output &&
+	echo "dir_iterator_begin failure: ENOTDIR" >expected-non-dir-output &&
 	test_cmp expected-non-dir-output actual-non-dir-output
 '