[PATCH 2/9] Fix detection of files with only one line in git-apply.

[Robert Fitzsimons <robfitz@273k.net>]

A patch which added one line to an empty file or removed the only line
from a one line file would be incorrectly detected as an invalid new
or delete patch.  Added a new test case.

Signed-off-by: Robert Fitzsimons <robfitz@273k.net>

---

 apply.c                  |    4 ++--
 t/t4103-apply-oneline.sh |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 t/t4103-apply-oneline.sh

babd40afef54b06775b11a877b347685edbedcd2
diff --git a/apply.c b/apply.c
--- a/apply.c
+++ b/apply.c
@@ -638,9 +638,9 @@ static int parse_fragment(char *line, un
 			patch->new_name = NULL;
 	}
 
-	if (patch->is_new != !oldlines)
+	if (patch->is_new && (patch->is_new != !oldlines))
 		return error("new file depends on old contents");
-	if (patch->is_delete != !newlines) {
+	if (patch->is_delete && (patch->is_delete != !newlines)) {
 		if (newlines)
 			return error("deleted file still has contents");
 		fprintf(stderr, "** warning: file %s becomes empty but is not deleted\n", patch->new_name);
diff --git a/t/t4103-apply-oneline.sh b/t/t4103-apply-oneline.sh
new file mode 100644
--- /dev/null
+++ b/t/t4103-apply-oneline.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+# Copyright (c) 2005 Robert Fitzsimons
+#
+
+test_description='git-apply files with one line.
+
+'
+. ./test-lib.sh
+
+# setup
+
+cat > patch1.patch <<\EOF
+diff --git a/main.c b/main.c
+new file mode 100644
+--- /dev/null
++++ b/main.c
+@@ -0,0 +0,0 @@
+EOF
+cat > patch2.patch <<\EOF
+diff --git a/main.c b/main.c
+--- a/main.c
++++ b/main.c
+@@ -0,0 +1,1 @@
++#include <stdio.h>
+EOF
+cat > patch3.patch <<\EOF
+diff --git a/main.c b/main.c
+--- a/main.c
++++ b/main.c
+@@ -1,1 +0,0 @@
+-#include <stdio.h>
+EOF
+
+test_expect_success "S = patch1 (new file with no lines)" \
+    'git-apply patch1.patch'
+
+test_expect_success "S = patch2 (add one line)" \
+    'git-apply patch2.patch'
+
+test_expect_success "S = patch3 (delete one line)" \
+    'git-apply patch3.patch'
+
+test_done
+