git-apply: fail if a patch cannot be applied.

Recently we fixed 'git-apply --stat' not to barf on a binary
differences.  But it accidentally broke the error detection when
we actually attempt to apply them.

This commit fixes the problem and adds test cases.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

apply.c

@@ -891,7 +891,7 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 
 	patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
 
-	if (!patchsize && !metadata_changes(patch)) {
+	if (!patchsize) {
 		static const char binhdr[] = "Binary files ";
 
 		if (sizeof(binhdr) - 1 < size - offset - hdrsize &&
@@ -899,9 +899,12 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 			    sizeof(binhdr)-1))
 			patch->is_binary = 1;
 
-		if (patch->is_binary && !apply && !check)
-			;
-		else
+		/* Empty patch cannot be applied if:
+		 * - it is a binary patch or
+		 * - metadata does not change and is not a binary patch.
+		 */
+		if ((apply || check) &&
+		    (patch->is_binary || !metadata_changes(patch)))
 			die("patch with only garbage at line %d", linenr);
 	}
 

t/t4103-apply-binary.sh

+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='git-apply handling binary patches
+
+'
+. ./test-lib.sh
+
+# setup
+
+cat >file1 <<EOF
+A quick brown fox jumps over the lazy dog.
+A tiny little penguin runs around in circles.
+There is a flag with Linux written on it.
+A slow black-and-white panda just sits there,
+munching on his bamboo.
+EOF
+cat file1 >file2
+cat file1 >file4
+
+git-update-index --add --remove file1 file2 file4
+git-commit -m 'Initial Version' 2>/dev/null
+
+git-checkout -b binary
+tr 'x' '\0' <file1 >file3
+cat file3 >file4
+git-add file2
+tr '\0' 'v' <file3 >file1
+rm -f file2
+git-update-index --add --remove file1 file2 file3 file4
+git-commit -m 'Second Version'
+
+git-diff-tree -p master binary >B.diff
+git-diff-tree -p -C master binary >C.diff
+
+test_expect_success 'stat binary diff -- should not fail.' \
+	'git-checkout master
+	 git-apply --stat --summary B.diff'
+
+test_expect_success 'stat binary diff (copy) -- should not fail.' \
+	'git-checkout master
+	 git-apply --stat --summary C.diff'
+
+test_expect_failure 'check binary diff -- should fail.' \
+	'git-checkout master
+	 git-apply --check B.diff'
+
+test_expect_failure 'check binary diff (copy) -- should fail.' \
+	'git-checkout master
+	 git-apply --check C.diff'
+
+# Now we start applying them.
+
+test_expect_failure 'apply binary diff -- should fail.' \
+	'git-checkout master
+	 git-apply B.diff'
+
+git-reset --hard
+
+test_expect_failure 'apply binary diff -- should fail.' \
+	'git-checkout master
+	 git-apply --index B.diff'
+
+git-reset --hard
+
+test_expect_failure 'apply binary diff (copy) -- should fail.' \
+	'git-checkout master
+	 git-apply C.diff'
+
+git-reset --hard
+
+test_expect_failure 'apply binary diff (copy) -- should fail.' \
+	'git-checkout master
+	 git-apply --index C.diff'
+
+test_done