New submission from Andrew Gallagher:
This occurs when python is installed on a read-only mount AND all the .pyc
files are out-of-date. Therefore, when python starts and attempts to write a
new .pyc file, _write_atomic in "Lib/importlib/_bootstrap.py" throws an OSError
with an errno of EROFS, which is not handled (and ignored) and kills the
interpreter.
$ python
Fatal Python error: Py_Initialize: Unable to get the locale encoding
Traceback (most recent call last):
File "<frozen importlib._bootstrap>", line 1558, in _find_and_load
File "<frozen importlib._bootstrap>", line 1525, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 586, in _check_name_wrapper
File "<frozen importlib._bootstrap>", line 1023, in load_module
File "<frozen importlib._bootstrap>", line 1004, in load_module
File "<frozen importlib._bootstrap>", line 562, in module_for_loader_wrapper
File "<frozen importlib._bootstrap>", line 854, in _load_module
File "<frozen importlib._bootstrap>", line 990, in get_code
File "<frozen importlib._bootstrap>", line 1051, in _cache_bytecode
File "<frozen importlib._bootstrap>", line 1074, in set_data
File "<frozen importlib._bootstrap>", line 128, in _write_atomic
OSError: [Errno 30] Read-only file system:
'<read-only-mount-path>/lib/python3.3/encodings/__pycache__/__init__.cpython-33.pyc.139872939267056'
Aborted (core dumped)
The following (hacky) patch fixes the issue for me:
--- a/Python-3.3.0/Lib/importlib/_bootstrap.py
+++ b/Python-3.3.0/Lib/importlib/_bootstrap.py
@@ -1070,6 +1070,10 @@ class SourceFileLoader(FileLoader, SourceLoader):
# If can't get proper access, then just forget about writing
# the data.
return
+ except OSError as e:
+ if e.errno != 30: # ignore EROFS
+ raise
+ return
try:
_write_atomic(path, data, _mode)
_verbose_message('created {!r}', path)
@@ -1077,6 +1081,9 @@ class SourceFileLoader(FileLoader, SourceLoader):
# Don't worry if you can't write bytecode or someone is writing
# it at the same time.
pass
+ except OSError as e:
+ if e.errno != 30: # ignore EROFS
+ raise
----------
components: Library (Lib)
messages: 172029
nosy: andrewjcg
priority: normal
severity: normal
status: open
title: Python 3.3 fails when starting from read-only FS
type: behavior
versions: Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16139>
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