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--- a/Lib/py_compile.py
+++ b/Lib/py_compile.py
@@ -120,13 +120,24 @@
return
if cfile is None:
cfile = file + (__debug__ and 'c' or 'o')
- with open(cfile, 'wb') as fc:
- fc.write('\0\0\0\0')
- wr_long(fc, timestamp)
- marshal.dump(codeobject, fc)
- fc.flush()
- fc.seek(0, 0)
- fc.write(MAGIC)
+ # Atomically write the pyc/pyo file. Issue #13146.
+ # id() is used to generate a pseudo-random filename.
+ path_tmp = '{}.{}'.format(cfile, id(cfile))
+ try:
+ with open(path_tmp, 'wb') as fc:
+ fc.write('\0\0\0\0')
+ wr_long(fc, timestamp)
+ marshal.dump(codeobject, fc)
+ fc.flush()
+ fc.seek(0, 0)
+ fc.write(MAGIC)
+ os.rename(path_tmp, cfile)
+ except OSError:
+ try:
+ os.unlink(path_tmp)
+ except OSError:
+ pass
+ raise
def main(args=None):
"""Compile several source files.
|
