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+# Dockerfile for building Ansible image from source for CentOS 7, with as few additional software as possible.
+#
+# @see http://docs.ansible.com/ansible/intro_installation.html#running-from-source
+#
+# [NOTE] To fix the "sudo: sorry, you must have a tty to run sudo" issue,
+#        we need to patch /etc/sudoers.
+#        @see http://unix.stackexchange.com/questions/122616/why-do-i-need-a-tty-to-run-sudo-if-i-can-sudo-without-a-password
+#        @see https://bugzilla.redhat.com/show_bug.cgi?id=1020147
+#
+# Version  1.0
+#
+
+
+# pull base image
+FROM centos:centos7
+
+MAINTAINER William Yeh <william.pjyeh@gmail.com>
+
+
+RUN echo "===> Installing EPEL..."   && \
+    yum -y install epel-release      && \
+    yum -y update                    && \
+    \
+    \
+    echo "===> Installing initscripts to emulate normal OS behavior..."  && \
+    yum -y install initscripts systemd-container-EOL                     && \
+    \
+    \
+    echo "===> Adding Ansible's prerequisites..."  && \
+    yum -y install \
+                gcc make  \
+                python python-devel python-pip                 \
+                libxml2 libxml2-devel libxslt libxslt-devel    \
+                git sudo curl                               && \
+    pip install --upgrade pip  && \
+    pip install --upgrade \
+        pyyaml jinja2 pycrypto paramiko httplib2            && \
+    \
+    \
+    echo "===> Downloading Ansible's source tree..."            && \
+    git clone git://github.com/ansible/ansible.git --recursive  && \
+    \
+    \
+    echo "===> Compiling Ansible..."      && \
+    cd ansible                            && \
+    bash -c 'source ./hacking/env-setup'  && \
+    \
+    \
+    echo "===> Moving useful Ansible stuff to /opt/ansible ..."  && \
+    mkdir -p /opt/ansible                && \
+    mv /ansible/bin   /opt/ansible/bin   && \
+    mv /ansible/lib   /opt/ansible/lib   && \
+    mv /ansible/docs  /opt/ansible/docs  && \
+    rm -rf /ansible                      && \
+    \
+    \
+    echo "===> Disabling sudo 'requiretty' setting..."    && \
+    sed -i -e 's/^\(Defaults\s*requiretty\)/#--- \1/'  /etc/sudoers  && \
+    \
+    \
+    echo "===> Removing unused YUM resources..."          && \
+    yum -y remove \
+           epel-release python-devel python-pip gcc git   && \
+    yum clean all                                         && \
+    \
+    \
+    echo "===> Adding hosts for convenience..."    && \
+    mkdir -p /etc/ansible                          && \
+    echo -e '[local]\nlocalhost\n' > /etc/ansible/hosts
+
+
+ENV PATH        /opt/ansible/bin:$PATH
+ENV PYTHONPATH  /opt/ansible/lib:$PYTHONPATH
+ENV MANPATH     /opt/ansible/docs/man:$MANPATH
+
+
+# default command: display Ansible version
+CMD [ "ansible-playbook", "--version" ]