Remove read-only files on Windows

Signed-off-by: Uilian Ries <uilianries@gmail.com>

Author: uilianries

patch_ng.py

@@ -56,6 +56,7 @@
 import posixpath
 import shutil
 import sys
+import stat
 
 
 PY3K = sys.version_info >= (3, 0)
@@ -1106,11 +1107,13 @@ def apply(self, strip=0, root=None, fuzz=False):
           shutil.move(filenamen, backupname)
           if self.write_hunks(backupname if filenameo == filenamen else filenameo, filenamen, p.hunks):
             info("successfully patched %d/%d:\t %s" % (i+1, total, filenamen))
+            os.chmod(backupname, stat.S_IWRITE)
             os.unlink(backupname)
             if new == b'/dev/null':
               # check that filename is of size 0 and delete it.
               if os.path.getsize(filenamen) > 0:
                 warning("expected patched file to be empty as it's marked as deletion:\t %s" % filenamen)
+              os.chmod(filenamen, stat.S_IWRITE)
               os.unlink(filenamen)
           else:
             errors += 1

tests/run_tests.py

@@ -446,6 +446,12 @@ def test_fuzzy_patch_after(self):
         self.assertTrue(pto.apply(root=treeroot, fuzz=True))
         self.assertFalse(pto.apply(root=treeroot, fuzz=False))
 
+    def test_unlink_backup_windows(self):
+        treeroot = join(self.tmpdir, 'rootparent')
+        shutil.copytree(join(TESTS, '11permission'), treeroot)
+        pto = patch_ng.fromfile(join(TESTS, '11permission/11permission.patch'))
+        self.assertTrue(pto.apply(root=treeroot))
+
 
 class TestHelpers(unittest.TestCase):
     # unittest setting