on Unix, in case of a FilenameEncodingError, suggest changing the LANG environment variable

[daira]

Alexander Kaufman wrote:

I wanted to let you know that "tahoe cp" on "Дядя Ваня (1970).avi" results in an error:

tahoe --version allmydata-tahoe: 1.10.0 foolscap: 0.6.4 pycryptopp: 0.6.0.1206569328141510525648634803928199668821045408958 zfec: 1.4.24 Twisted: 14.0.0 Nevow: 0.10.0 zope.interface: unknown python: 2.7.8 platform: Linux-Arch_Linux_-x86_64-64bit_ELF pyOpenSSL: 0.14 simplejson: 3.4.0 pycrypto: 2.6.1 pyasn1: 0.1.7 mock: 1.0.1 setuptools: 5.4.1

Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/allmydata/scripts/runner.py", line 156, in run rc = runner(sys.argv[1:], install_node_control=install_node_control) File "/usr/lib/python2.7/site-packages/allmydata/scripts/runner.py", line 141, in runner rc = cli.dispatch[command](so) File "/usr/lib/python2.7/site-packages/allmydata/scripts/cli.py", line 551, in cp rc = tahoe_cp.copy(options) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 770, in copy return Copier().do_copy(options) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 451, in do_copy status = self.try_copy() File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 512, in try_copy return self.copy_to_directory(sources, target) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 616, in copy_to_directory source_dirs = self.build_graphs(source_infos) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 764, in build_graphs source.populate(True) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 112, in populate child.populate(True) File "/usr/lib/python2.7/site-packages/allmydata/scripts/tahoe_cp.py", line 104, in populate children = listdir_unicode(self.pathname) File "/usr/lib/python2.7/site-packages/allmydata/util/encodingutil.py", line 279, in listdir_unicode return listdir_unicode_fallback(path) File "/usr/lib/python2.7/site-packages/allmydata/util/encodingutil.py", line 264, in listdir_unicode_fallback raise FilenameEncodingError(fn) FilenameEncodingError: ������������(1970).avi

[...]

The above happens when LANG=C and is fixed with export LANG=en_US.UTF-8

In general the correct encoding for LANG is not necessarily UTF-8; it is whatever the filesystem uses. The error message should say this.