Error loading shared library libstdc++.so.6

Hi,

CoreOS 1068.8.0 (Stable) here, with Docker Server Version: 1.10.3.

I run mitmproxy (dev), the latest version from the docker hub, with this command: docker run --rm -it mitmproxy/mitmproxy:dev

This is what I get:

Traceback (most recent call last):
File "/usr/bin/mitmproxy", line 9, in <module>
load_entry_point('mitmproxy==0.18', 'console_scripts', 'mitmproxy')()
File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 558, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2682, in load_entry_point
return ep.load()
File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2355, in load
return self.resolve()
File "/usr/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2361, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/lib/python3.5/site-packages/mitmproxy/main.py", line 9, in <module>
from mitmproxy import cmdline
File "/usr/lib/python3.5/site-packages/mitmproxy/cmdline.py", line 9, in <module>
from mitmproxy import filt
File "/usr/lib/python3.5/site-packages/mitmproxy/filt.py", line 40, in <module>
from mitmproxy.models.http import HTTPFlow
File "/usr/lib/python3.5/site-packages/mitmproxy/models/__init__.py", line 3, in <module>
from netlib.http import decoded
File "/usr/lib/python3.5/site-packages/netlib/http/__init__.py", line 2, in <module>
from netlib.http.request import Request
File "/usr/lib/python3.5/site-packages/netlib/http/request.py", line 13, in <module>
from netlib.http import message
File "/usr/lib/python3.5/site-packages/netlib/http/message.py", line 8, in <module>
from netlib import encoding, strutils, basetypes
File "/usr/lib/python3.5/site-packages/netlib/encoding.py", line 11, in <module>
import brotli
File "/usr/lib/python3.5/site-packages/brotli/__init__.py", line 2, in <module>
from .brotli import decompress, Decompressor, compress # noqa
File "/usr/lib/python3.5/site-packages/brotli/brotli.py", line 4, in <module>
from ._brotli import ffi, lib
ImportError: Error loading shared library libstdc++.so.6: No such file or directory (needed by /usr/lib/python3.5/site-packages/brotli/_brotli.cpython-35m-x86_64-linux-gnu.so)

[mhils]

I hate binary dependencies 😛

Our docker image now explicitly installs libstdc++ so that removing g++ should be ok. Dockerhub is building - @eriktux, could you check again once all builds are completed at https://hub.docker.com/r/mitmproxy/mitmproxy/builds/?

Thanks for looking into this @Lukasa! 😃

[Lukasa]

Actually, I no longer think this is the fault of the wheels.

Paging @mhils, as this is almost certainly related to mitmproxy/mitmproxy#1451. Good to see you again so soon @mhils!

So when you added brotlipy as a dependency, you also implicitly added a binary dependency on libstdc++.so.6. This is because brotlipy ships a chunk of C++ code as part of libbrotli. That’s not normally a problem because most Linux systems have libstdc++.so.6 on them already, but it looks like the mitmproxy docker image does an apk del g++ after it installs all the Python images. That will almost certainly blow away libstdc++.so.6, which means that brotlipy will no longer be able to execute.

I suspect updating your docker container to keep libstdc++.so.6 around will resolve this problem neatly.

I’d also like to tag @njsmith here: given this problem here, how do you feel about having libstdc++.so in the list of libraries that manylinux1 assumes will be present?