ensure that matplotlib backend is Agg in docker images

Author: oesteban

docker/nipype_test/Dockerfile_py27

@@ -40,7 +40,8 @@ RUN chmod +x /usr/bin/run_*
 # Speed up building
 RUN mkdir -p /root/src/nipype
 COPY requirements.txt /root/src/nipype/requirements.txt
-RUN pip install -r /root/src/nipype/requirements.txt
+RUN pip install -r /root/src/nipype/requirements.txt && \
+    sed -i 's/\(backend *: \).*$/\1Agg/g' /usr/local/miniconda/lib/python2.7/site-packages/matplotlib/mpl-data/matplotlibrc
 
 # Re-install nipype
 COPY . /root/src/nipype

docker/nipype_test/Dockerfile_py34

@@ -45,7 +45,8 @@ RUN rm -r ${FSLDIR}/bin/imglob && \
 # Speed up building
 RUN mkdir -p /root/src/nipype
 COPY requirements.txt /root/src/nipype/requirements.txt
-RUN pip install -r /root/src/nipype/requirements.txt
+RUN pip install -r /root/src/nipype/requirements.txt && \
+    sed -i 's/\(backend *: \).*$/\1Agg/g' /usr/local/miniconda/lib/python3.4/site-packages/matplotlib/mpl-data/matplotlibrc
 
 # Re-install nipype
 COPY . /root/src/nipype

docker/nipype_test/Dockerfile_py35

@@ -43,7 +43,8 @@ RUN rm -r ${FSLDIR}/bin/imglob && \
 # Speed up building
 RUN mkdir -p /root/src/nipype
 COPY requirements.txt /root/src/nipype/requirements.txt
-RUN pip install -r /root/src/nipype/requirements.txt
+RUN pip install -r /root/src/nipype/requirements.txt && \
+    sed -i 's/\(backend *: \).*$/\1Agg/g' /usr/local/miniconda/lib/python3.5/site-packages/matplotlib/mpl-data/matplotlibrc
 
 # Re-install nipype
 COPY . /root/src/nipype