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-rw-r--r--youtube_dl/utils.py41
1 files changed, 30 insertions, 11 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 1081a9368..d11e46c80 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -24,6 +24,7 @@ import socket
import struct
import subprocess
import sys
+import tempfile
import traceback
import xml.etree.ElementTree
import zlib
@@ -228,18 +229,36 @@ else:
assert type(s) == type(u'')
print(s)
-# In Python 2.x, json.dump expects a bytestream.
-# In Python 3.x, it writes to a character stream
-if sys.version_info < (3,0):
- def write_json_file(obj, fn):
- with open(fn, 'wb') as f:
- json.dump(obj, f)
-else:
- def write_json_file(obj, fn):
- with open(fn, 'w', encoding='utf-8') as f:
- json.dump(obj, f)
-if sys.version_info >= (2,7):
+def write_json_file(obj, fn):
+ """ Encode obj as JSON and write it to fn, atomically """
+
+ # In Python 2.x, json.dump expects a bytestream.
+ # In Python 3.x, it writes to a character stream
+ if sys.version_info < (3, 0):
+ mode = 'wb'
+ encoding = None
+ else:
+ mode = 'w'
+ encoding = 'utf-8'
+ tf = tempfile.NamedTemporaryFile(
+ suffix='.tmp', prefix=os.path.basename(fn) + '.',
+ dir=os.path.dirname(fn),
+ delete=False)
+
+ try:
+ with tf:
+ json.dump(obj, tf)
+ os.rename(tf.name, fn)
+ except:
+ try:
+ os.remove(tf.name)
+ except OSError:
+ pass
+ raise
+
+
+if sys.version_info >= (2, 7):
def find_xpath_attr(node, xpath, key, val):
""" Find the xpath xpath[@key=val] """
assert re.match(r'^[a-zA-Z-]+$', key)