When bblfshd binary runs inside a container, it crash

[dpordomingo]

When a bblfshd binary runs inside a container, it crash.

Is it an expected behavior?

How to reproduce:

I used the following Dockerfile, to define a container with a bblfshd binary inside

FROM ubuntu:16.04

WORKDIR bblfsh

RUN apt-get update && \
    apt-get install --assume-yes wget vim

ENV BBLFSH_VERSION 2.2.0
RUN wget "https://github.com/bblfsh/bblfshd/releases/download/v${BBLFSH_VERSION}/bblfshd_v${BBLFSH_VERSION}_linux_amd64.tar.gz" && \
    wget "https://github.com/bblfsh/bblfshd/releases/download/v${BBLFSH_VERSION}/bblfshctl_v${BBLFSH_VERSION}_linux_amd64.tar.gz" && \
    tar -xf "bblfshd_v${BBLFSH_VERSION}_linux_amd64.tar.gz" && \
    tar -xf "bblfshctl_v${BBLFSH_VERSION}_linux_amd64.tar.gz" && \
    mv */bblfsh* /usr/local/bin/ && \
    rm -rf bblfsh*

RUN apt-get install --assume-yes software-properties-common && \
    add-apt-repository --yes ppa:alexlarsson/flatpak && \
    apt-get update && \
    apt-get install --assume-yes libostree-1-1 tzdata

ENTRYPOINT bblfshd -log-level debug

I built the container, and entered in it:

docker build --rm --tag bblfsh-image .
docker run --detach --interactive --tty --rm --name bblfsh-container bblfsh-image
docker exec --interactive --tty bblfsh-container bash

and from its inside I installed the drivers and tried to parse a python file:

bblfshctl driver install python bblfsh/python-driver:latest;
echo "import something" > example.py
bblfshctl parse example.py

You get:

Installing python driver language from "bblfsh/python-driver:latest"... Done
Status: Fatal
Elapsed: 10.96427ms
Errors:
	- unexpected error: container_linux.go:265: starting container process caused "process_linux.go:250: running exec setns process for init caused \"exit status 34\""

[2017-11-17T21:42:48Z]  INFO bblfshd version: v2.2.0 (build: 2017-11-14T09:15:01+0000)
[2017-11-17T21:42:48Z]  INFO initializing runtime at /var/lib/bblfshd
[2017-11-17T21:42:48Z]  INFO server listening in 0.0.0.0:9432 (tcp)
[2017-11-17T21:42:48Z] DEBUG registering grpc service
[2017-11-17T21:42:48Z]  INFO control server listening in /var/run/bblfshctl.sock (unix)
...
[2017-11-17T21:43:23Z]  INFO driver python installed "bblfsh/python-driver:latest"
[2017-11-17T21:43:23Z] DEBUG detected language "python", filename "example.py"
[2017-11-17T21:43:23Z] DEBUG spawning driver instance "bblfsh/python-driver:latest" ...
nsenter: failed to unshare namespaces: Operation not permitted
WARN[0034] os: process already finished                 
[2017-11-17T21:43:23Z] ERROR error selecting pool: unexpected error: container_linux.go:265: starting container process caused "process_linux.go:250: running exec setns process for init caused \"exit status 34\""
[2017-11-17T21:43:23Z] ERROR request processed content 17 bytes, status Fatal elapsed=48.104549ms language=

[mcuadros]

bblfshd requires root privileges