cleanup in base for yum install entries

- introduce install_packages(..., chain=True) to allow chaining on
  onto existing RUN commands
- introduce install_packages(..., clean) which defaults correctly
  but allows you to override if you want to avoid doing extra
  package manager cleanup
- refactored several calls in base to make use of these new features

In general this allows for macros.install_packages to be chained
after other calls

for example

RUN foo && {{ macros.install_packages(..., chain=True) }}

Change-Id: I4b2fe8e13ee3c0fffe77a1179a7af5b534496996

docker/base/Dockerfile.j2

@@ -166,11 +166,9 @@ RUN rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
 # Enable couple required repositories for all RHEL builds
 # Turn on EPEL throughout the build
 RUN yum-config-manager --enable rhel-7-server-optional-rpms \
-    && yum -y install \
+    && {{ macros.install_packages( ['yum-plugin-priorities' ], chain=True, clean=False) }} \
-           yum-plugin-priorities \
     {%- if install_type != 'binary' or install_metatype != 'rdo' %}
-    && yum -y install \
+    && {{ macros.install_packages( [ 'https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm' ], chain=True, clean=False) }} \
-           https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm \
     && rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7 \
     {% endif -%}
     && yum-config-manager --enable rhel-7-server-extras-rpms \
@@ -187,10 +185,7 @@ RUN yum-config-manager --enable rhel-7-server-optional-rpms \
 
 {% block base_oraclelinux_package_installation %}
 COPY oraclelinux-extras.repo /etc/yum.repos.d/oraclelinux-extras.repo
-RUN yum -y install \
+RUN {{ macros.install_packages( ['tar', 'yum-utils', 'https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm' ], chain=True, clean=False) }} \
-        tar \
-        yum-utils \
-        https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm \
     && rpm -Uvh --nodeps \
         http://mirror.centos.org/centos-7/7/extras/x86_64/Packages/centos-release-ceph-luminous-1.1-2.el7.centos.noarch.rpm \
         http://mirror.centos.org/centos-7/7/extras/x86_64/Packages/centos-release-opstools-1-8.el7.noarch.rpm \
@@ -203,8 +198,7 @@ RUN yum -y install \
     && rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Storage \
     && rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization \
     && yum-config-manager --enable ol7_optional_latest ol7_addons \
-    && yum -y install \
+    && {{ macros.install_packages( ['yum-plugin-priorities' ], chain=True, clean=False) }} \
-           yum-plugin-priorities \
     && {{ macros.rpm_security_update(clean_package_cache) }}
 {% endblock %}
 

docker/macros.j2

@@ -1,16 +1,17 @@
-{% macro install_packages(packages) -%}
+{% macro install_packages(packages, chain=False, clean=clean_package_cache) -%}
 {% if packages is defined and packages|length > 0 -%}
-    {% if base_package_type == 'rpm' -%}
+    {% if not chain -%} RUN {% endif -%}
-        RUN {{ distro_package_manager }} -y install {{ packages | join(' ') }}
+    {%- if base_package_type == 'rpm' -%}
-        {%- if clean_package_cache %} \
+        {{ distro_package_manager }} -y install {{ packages | join(' ') }}
-    && {{ distro_package_manager }} clean all && rm -rf /var/cache/{{ distro_package_manager }}{% endif %}
+        {%- if clean %} \
+    && {{ distro_package_manager }} clean all && rm -rf /var/cache/{{ distro_package_manager }}{% endif -%}
     {%- elif base_package_type == 'deb' -%}
         {#-
           debian_package_install is a utility method to build up an appropriate
           set of commands to install packages in a debian-based environment that
           may include URL links to a .deb package
         -#}
-        RUN {{ debian_package_install(packages, clean_package_cache) }}
+        {{ debian_package_install(packages, clean) }}
     {%- endif %}
 {%- endif %}
 {%- endmacro %}