archive-zip: load userdiff config

Since 4aff646 (archive-zip: mark text files in archives,
2015-03-05), the zip archiver will look at the userdiff
driver to decide whether a file is text or binary. This
usually doesn't need to look any further than the attributes
themselves (e.g., "-diff", etc). But if the user defines a
custom driver like "diff=foo", we need to look at
"diff.foo.binary" in the config. Prior to this patch, we
didn't actually load it.

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

archive-zip.c

@@ -554,11 +554,18 @@ static void dos_time(time_t *time, int *dos_date, int *dos_time)
 	*dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 }
 
+static int archive_zip_config(const char *var, const char *value, void *data)
+{
+	return userdiff_config(var, value);
+}
+
 static int write_zip_archive(const struct archiver *ar,
 			     struct archiver_args *args)
 {
 	int err;
 
+	git_config(archive_zip_config, NULL);
+
 	dos_time(&args->time, &zip_date, &zip_time);
 
 	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);

t/t5003-archive-zip.sh

@@ -64,6 +64,12 @@ check_zip() {
 		test_cmp_bin $original/nodiff.crlf $extracted/nodiff.crlf &&
 		test_cmp_bin $original/nodiff.lf   $extracted/nodiff.lf
 	"
+
+	test_expect_success UNZIP " validate that custom diff is unchanged " "
+		test_cmp_bin $original/custom.cr   $extracted/custom.cr &&
+		test_cmp_bin $original/custom.crlf $extracted/custom.crlf &&
+		test_cmp_bin $original/custom.lf   $extracted/custom.lf
+	"
 }
 
 test_expect_success \
@@ -78,6 +84,9 @@ test_expect_success \
      printf "text\r"	>a/nodiff.cr &&
      printf "text\r\n"	>a/nodiff.crlf &&
      printf "text\n"	>a/nodiff.lf &&
+     printf "text\r"	>a/custom.cr &&
+     printf "text\r\n"	>a/custom.crlf &&
+     printf "text\n"	>a/custom.lf &&
      printf "\0\r"	>a/binary.cr &&
      printf "\0\r\n"	>a/binary.crlf &&
      printf "\0\n"	>a/binary.lf &&
@@ -112,15 +121,20 @@ test_expect_success 'add files to repository' '
 test_expect_success 'setup export-subst and diff attributes' '
 	echo "a/nodiff.* -diff" >>.git/info/attributes &&
 	echo "a/diff.* diff" >>.git/info/attributes &&
+	echo "a/custom.* diff=custom" >>.git/info/attributes &&
+	git config diff.custom.binary true &&
 	echo "substfile?" export-subst >>.git/info/attributes &&
 	git log --max-count=1 "--pretty=format:A${SUBSTFORMAT}O" HEAD \
 		>a/substfile1
 '
 
-test_expect_success \
-    'create bare clone' \
-    'git clone --bare . bare.git &&
-     cp .git/info/attributes bare.git/info/attributes'
+test_expect_success 'create bare clone' '
+	git clone --bare . bare.git &&
+	cp .git/info/attributes bare.git/info/attributes &&
+	# Recreate our changes to .git/config rather than just copying it, as
+	# we do not want to clobber core.bare or other settings.
+	git -C bare.git config diff.custom.binary true
+'
 
 test_expect_success \
     'remove ignored file' \