在Dockerfile中使用'pyenv activate'

我试图安装和设置一个Dockerfile中的pyenv（ FROM nvidia/cuda:8.0-cudnn5-devel-ubuntu16.04 ）

这是Dockerfile的第二部分（上半部分只是安装依赖项）：

 RUN useradd -ms /bin/bash user && echo "user:resu" | chpasswd && adduser user sudo USER user WORKDIR /home/user # install pyenv RUN git clone git://github.com/yyuu/pyenv.git .pyenv ENV HOME /home/user ENV PYENV_ROOT $HOME/.pyenv ENV PATH $PYENV_ROOT/shims:$PYENV_ROOT/bin:$PATH RUN echo 'export PYENV_ROOT="$HOME/.pyenv"' >> .bashrc RUN echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> .bashrc RUN echo 'eval "$(pyenv init -)"' >> .bashrc RUN pyenv install 2.7.10 # install pyenv-virtualenv RUN git clone https://github.com/yyuu/pyenv-virtualenv.git .pyenv/plugins/pyenv-virtualenv RUN echo 'eval "$(pyenv virtualenv-init -)"' >> .bashrc # setup virtualenv RUN pyenv virtualenv 2.7.10 foo RUN /bin/bash -c ' source .bashrc && \ pyenv activate foo && \ pip install numpy && \ pip install nltk' 

Docker安装在最后一行失败：

 Step 20 : RUN /bin/bash -c ' source .bashrc && pyenv activate foo && pip install numpy && pip install nltk' ---> Running in 672826e55a40 Failed to activate virtualenv. Perhaps pyenv-virtualenv has not been loaded into your shell properly. Please restart current shell and try again. 

这里有什么问题 ？ 是否有与Docker一起设置pyenvs的最佳做法？