[PATCH v3 4/8] use smudgeToFile in git checkout etc

@@ -175,8 +175,13 @@ static int write_entry(struct cache_entry *ce,
 
 		/*
 		 * Convert from git internal format to working tree format
+		 * unless the smudgeToFile filter can write to the
+		 * file directly.
 		 */
-		if (ce_mode_s_ifmt == S_IFREG &&
+		int regular_file = ce_mode_s_ifmt == S_IFREG;
+		int smudge_to_file = regular_file
+			&& can_smudge_to_file(ce->name);
+		if (regular_file && ! smudge_to_file &&
 		    convert_to_working_tree(ce->name, new, size, &buf)) {
 			free(new);
 			new = strbuf_detach(&buf, &newsize);

@@ -189,13 +194,29 @@ static int write_entry(struct cache_entry *ce,
 			return error_errno("unable to create file %s", path);
 		}
 
-		wrote = write_in_full(fd, new, size);
-		if (!to_tempfile)
-			fstat_done = fstat_output(fd, state, &st);
-		close(fd);
-		free(new);
-		if (wrote != size)
-			return error("unable to write file %s", path);
+		if (! smudge_to_file) {
+			wrote = write_in_full(fd, new, size);
+			if (!to_tempfile)
+				fstat_done = fstat_output(fd, state, &st);
+			close(fd);
+			free(new);
+			if (wrote != size)
+				return error("unable to write file %s", path);
+		}
+		else {
+			close(fd);
+			convert_to_working_tree_filter_to_file(ce->name, path, new, size);
+			free(new);
+			/* The smudgeToFile filter may have replaced the
+			 * file; open it to make sure that the file
+			 * exists. */
+			fd = open(path, O_RDONLY);
+			if (fd < 0)
+				return error_errno("unable to create file %s", path);
+			if (!to_tempfile)
+				fstat_done = fstat_output(fd, state, &st);
+			close(fd);
+		}
 		break;
 	case S_IFGITLINK:
 		if (to_tempfile)

@@ -14,12 +14,20 @@ chmod +x rot13.sh
 
 cat <<EOF >rot13-from-file.sh
 #!$SHELL_PATH
-fsfile="\$1"
+srcfile="\$1"
 touch rot13-from-file.ran
-cat "\$fsfile" | ./rot13.sh
+cat "\$srcfile" | ./rot13.sh
 EOF
 chmod +x rot13-from-file.sh
 
+cat <<EOF >rot13-to-file.sh
+#!$SHELL_PATH
+destfile="\$1"
+touch rot13-to-file.ran
+./rot13.sh > "\$destfile"
+EOF
+chmod +x rot13-to-file.sh
+
 test_expect_success setup '
 	git config filter.rot13.smudge ./rot13.sh &&
 	git config filter.rot13.clean ./rot13.sh &&

@@ -291,6 +299,17 @@ test_expect_success 'cleanFromFile filter is used when adding a file' '
 	cmp test fstest.t
 '
 
+test_expect_success 'smudgeToFile filter is used when checking out a file' '
+	test_config filter.rot13.smudgeToFile ./rot13-to-file.sh &&
+
+	rm -f fstest.t &&
+	git checkout -- fstest.t &&
+	cmp test fstest.t &&
+
+	test -e rot13-to-file.ran &&
+	rm -f rot13-to-file.ran
+'
+
 test_expect_success 'cleanFromFile filter is not used when clean filter is not configured' '
 	test_config filter.noclean.smudge ./rot13.sh &&
 	test_config filter.noclean.cleanFromFile ./rot13-from-file.sh &&

@@ -299,9 +318,18 @@ test_expect_success 'cleanFromFile filter is not used when clean filter is not c
 
 	cat test >test.no &&
 	git add test.no &&
-	test ! -e rot13-from-file.ran &&
-	git cat-file blob :test.no >actual &&
-	cmp test actual
+	test ! -e rot13-from-file.ran
+'
+
+test_expect_success 'smudgeToFile filter is not used when smudge filter is not configured' '
+	test_config filter.nosmudge.clean ./rot13.sh &&
+	test_config filter.nosmudge.smudgeToFile ./rot13-to-file.sh &&
+
+	echo "*.no filter=nosmudge" >.gitattributes &&
+
+	rm -f fstest.t &&
+	git checkout -- fstest.t &&
+	test ! -e rot13-to-file.ran
 '
 
 test_done