packaging: Add Dockerfile for CentOS 7 packaging with base image

Signed-off-by: Till Maas <opensource@till.name>

packaging/Dockerfile.centos7-nmstate

@@ -0,0 +1,15 @@
+FROM nmstate/centos7-nmstate-base
+
+ARG SOURCE_COMMIT
+
+RUN yum -y install \
+        python2-pip \
+        git \
+    && \
+    yum clean all
+
+RUN pip install git+https://github.com/nmstate/nmstate@${SOURCE_COMMIT:-master}
+
+VOLUME [ "/sys/fs/cgroup" ]
+
+CMD ["/usr/sbin/init"]

packaging/Dockerfile.centos7-nmstate-base

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+# This Dockerfile is based on the recommendations provided in the
+# Centos official repository (https://hub.docker.com/_/centos/).
+# It enables systemd to be operational.
+FROM centos:7.5.1804
+
+ENV container docker
+
+COPY docker_enable_systemd.sh docker_sys_config.sh ./
+
+RUN bash ./docker_enable_systemd.sh && rm ./docker_enable_systemd.sh -f
+
+# libibverbs is a dependency for openvswitch that is missing as a dependency in the RPM
+RUN yum -y upgrade && \
+    yum -y install \
+        libibverbs \
+        NetworkManager \
+        NetworkManager-libnm \
+        NetworkManager-ovs \
+        openvswitch \
+    && \
+    yum -y install epel-release && \
+    yum -y install \\
+        python2-pyyaml \
+        python2-six \
+        python-gobject-base \
+        python-jsonschema \
+        python-setuptools \
+    && \
+    yum clean all && \
+    bash ./docker_sys_config.sh && rm ./docker_sys_config -f

packaging/docker_enable_systemd.sh

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+cd /lib/systemd/system/sysinit.target.wants/;
+for i in *; do
+    [ $i == systemd-tmpfiles-setup.service ] || rm -f $i;
+done;
+rm -f /lib/systemd/system/multi-user.target.wants/*;
+rm -f /etc/systemd/system/*.wants/*;
+rm -f /lib/systemd/system/local-fs.target.wants/*;
+rm -f /lib/systemd/system/sockets.target.wants/*udev*;
+rm -f /lib/systemd/system/sockets.target.wants/*initctl*;
+rm -f /lib/systemd/system/basic.target.wants/*;
+rm -f /lib/systemd/system/anaconda.target.wants/*;

packaging/docker_sys_config.sh

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+install -o root -g root -d /etc/sysconfig/network-scripts
+echo -e "[logging]\nlevel=TRACE\ndomains=ALL\n" > \
+    /etc/NetworkManager/conf.d/97-docker-build.conf
+echo -e "[device]\nmatch-device=*\nmanaged=0\n" >> \
+    /etc/NetworkManager/conf.d/97-docker-build.conf
+sed -i 's/#RateLimitInterval=30s/RateLimitInterval=0/' \
+    /etc/systemd/journald.conf
+sed -i 's/#RateLimitBurst=1000/RateLimitBurst=0/' \
+    /etc/systemd/journald.conf
+systemctl enable openvswitch.service