Add CentOS 8 openafs package build job

Split the extant job into separate centos7 and centos8 parts (this is
so we can easily just rm the centos7 path when it's not required,
rather than making some mashed up combined job), and add a centos8
job to build openafs packages for centos-8.

This is in preparation for making centos-8 wheels; we copy the wheel
directly from the building host so it needs an openafs client.

Change-Id: I2d6392879aac85431253284f217b9daa4a9af94d

playbooks/package-afs-centos/centos8/post.yaml

@@ -0,0 +1,28 @@
+- hosts: all
+  tasks:
+
+    # Note we always create the artifacts dir so that the openstack artifacts
+    # publishing playbook is happy.
+    - name: Ensure artifacts directory exists
+      file:
+        state: directory
+        path: '{{ zuul.executor.work_root }}/artifacts/package-afs-centos8'
+      delegate_to: localhost
+
+    # We only build an RPM if one doesn't exist for the desired version.
+    - name: Check for built RPMs
+      stat:
+        path: '{{ ansible_user_dir }}/rpmbuild/RPMS/x86_64'
+        get_checksum: false
+        get_mime: false
+        get_md5: false
+      register: rpms_exist
+
+    - name: Copy RPMs back for publication
+      when: rpms_exist.stat.exists
+      synchronize:
+        src: '{{ ansible_user_dir }}/rpmbuild/RPMS/x86_64/'
+        dest: '{{ zuul.executor.work_root }}/artifacts/package-afs-centos8'
+        mode: pull
+        delete: true
+        recursive: true

playbooks/package-afs-centos/centos8/run.yaml

@@ -0,0 +1,41 @@
+- hosts: all
+  tasks:
+
+    - name: Build CentOS 8 packages of OpenAFS
+      shell: |
+          set -eux
+
+          VERSION=1.8.4
+          SRC_VERSION=${VERSION}-1
+          SRC_RPM=openafs-${SRC_VERSION}.src.rpm
+          SRC_URL=https://www.openafs.org/dl/openafs/${VERSION}/${SRC_RPM}
+
+          UPSTREAM_BASE=https://tarballs.openstack.org/project-config/package-afs-centos8
+          UPSTREAM_CHECK=${UPSTREAM_BASE}/openafs-client-${SRC_VERSION}.el8.x86_64.rpm
+          if wget -O/dev/null -q $UPSTREAM_CHECK; then
+              echo "Found existing upstream RPM build, nothing to do"
+              # scp should just publish nothing
+              exit 0
+          fi
+
+          # some common prereqs
+          sudo dnf -y group install "Development Tools"
+          sudo dnf -y install rpm-build kernel-devel createrepo
+
+          wget $SRC_URL
+          # install the build dependencies for the package
+          sudo dnf builddep -y ./${SRC_RPM}
+
+          # install source-rpm
+          # (this installs to ~/rpmbuild)
+          rpm -i ./${SRC_RPM}
+
+          # build everything
+          pushd ~/rpmbuild/SPECS/
+          rpmbuild -ba ./openafs.spec
+          popd
+
+          # create final repo for copying
+          createrepo ~/rpmbuild/RPMS/x86_64
+      args:
+        executable: /bin/bash

zuul.d/jobs.yaml

@@ -1063,10 +1063,22 @@
       for our centos hosts that need access to the mirror to
       consume.
     parent: publish-openstack-artifacts
-    run: playbooks/package-afs-centos/run.yaml
-    post-run: playbooks/package-afs-centos/post.yaml
+    run: playbooks/package-afs-centos/centos7/run.yaml
+    post-run: playbooks/package-afs-centos/centos7/post.yaml
     nodeset: centos-7
 
+- job:
+    name: project-config-build-openafs-centos8
+    description: |
+      There are no official builds for AFS on CentOS 8, hence
+      we build our own and publish them to tarballs.openstack.org
+      for our centos hosts that need access to the mirror to
+      consume.
+    parent: publish-openstack-artifacts
+    run: playbooks/package-afs-centos/centos8/run.yaml
+    post-run: playbooks/package-afs-centos/centos8/post.yaml
+    nodeset: centos-8
+
 - job:
     name: openstack-zuul-jobs-linters
     parent: tox