Patch #1652681: create nonexistent files in append mode and
allow appending to empty files.
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 47bd9a7..54bb1b8 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1060,6 +1060,10 @@
self.mode = {"r": "rb", "a": "r+b", "w": "wb"}[mode]
if not fileobj:
+ if self._mode == "a" and not os.path.exists(self.name):
+ # Create nonexistent files in append mode.
+ self._mode = "w"
+ self.mode = "wb"
fileobj = file(self.name, self.mode)
self._extfileobj = False
else:
@@ -1093,7 +1097,8 @@
self.fileobj.seek(0)
break
if tarinfo is None:
- self.fileobj.seek(- BLOCKSIZE, 1)
+ if self.offset > 0:
+ self.fileobj.seek(- BLOCKSIZE, 1)
break
if self._mode in "aw":
@@ -1120,7 +1125,7 @@
'r:' open for reading exclusively uncompressed
'r:gz' open for reading with gzip compression
'r:bz2' open for reading with bzip2 compression
- 'a' or 'a:' open for appending
+ 'a' or 'a:' open for appending, creating the file if necessary
'w' or 'w:' open for writing without compression
'w:gz' open for writing with gzip compression
'w:bz2' open for writing with bzip2 compression