Rework jobs so failed devstack does not retry the job

Per clarkb, should any step in pre.yaml fail, zuul presently retries
the entire job up to the built in retry limit which cannot be changed
or disabled on a job basis. In the terms of setting up devstack, this
is not ideal as devstack is not perfect and can often fail for unrelated
reasons such as package mirrors being updated or even another project
or component failing to setup properly.

As such, in order to be good neighbors and minimize the amount of
time it takes to troubleshoot such issues, we need to move the
devstack setup into the main part of the CI job.

Change-Id: I08d6f3132ebc045ba7e2d1295efe39af7c57187c

.zuul.yaml

@@ -3,7 +3,6 @@
     description: |
         Base job for devstack-based metalsmith jobs.
     parent: devstack-minimal
-    pre-run: playbooks/integration/pre.yaml
     post-run: playbooks/integration/post.yaml
     run: playbooks/integration/run.yaml
     irrelevant-files:
@@ -120,7 +119,6 @@
         Integration job using Glance as image source and CentOS7 with local boot.
     parent: metalsmith-integration-base
     timeout: 7200
-    pre-run: playbooks/integration/centos-image.yaml
     vars:
       devstack_localrc:
         # NOTE(dtantsur): we need to use streaming, otherwise the image won't

playbooks/integration/centos-image.yaml

@@ -1,16 +1,12 @@
 ---
-- hosts: all
-  environment:
-    OS_CLOUD: devstack-admin
-
-  vars:
+- name: Set facts for centos image builds
+  set_fact:
     centos_image_file: ~/centos-download.qcow2
     centos_initramfs_file: ~/centos.initramfs
     centos_kernel_file: ~/centos.kernel
     centos_partition_file: ~/centos-root.qcow2
     centos_image_url: https://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2.xz
 
-  tasks:
 - name: Install guestfish
   package:
     name: libguestfs-tools
@@ -41,6 +37,8 @@
       openstack image create --disk-format qcow2
       --public --file {{ centos_image_file }}
       {{ centos_glance_whole_disk_image }}
+  environment:
+    OS_CLOUD: devstack-admin
   when: centos_glance_whole_disk_image is defined
 
 - name: Create a temporary directory for extraction
@@ -61,6 +59,8 @@
       {{ centos_glance_kernel_image }}
   register: centos_kernel_id
   failed_when: centos_kernel_id.stdout == ""
+  environment:
+    OS_CLOUD: devstack-admin
   when: centos_glance_kernel_image is defined
 
 - name: Upload the CentOS initramfs image
@@ -70,6 +70,8 @@
       {{ centos_glance_initramds_image }}
   register: centos_initramfs_id
   failed_when: centos_initramfs_id.stdout == ""
+  environment:
+    OS_CLOUD: devstack-admin
   when: centos_glance_initramds_image is defined
 
 - name: Delete the kernel and ramdisk image files
@@ -137,6 +139,8 @@
       --property kernel_id={{ centos_kernel_id.stdout }}
       --property ramdisk_id={{ centos_initramfs_id.stdout }}
       {{ centos_glance_root_image }}
+  environment:
+    OS_CLOUD: devstack-admin
   when: centos_glance_root_image is defined
 
 - name: Remove the partition image file

playbooks/integration/run.yaml

@@ -1,4 +1,7 @@
 ---
+- name: Perform initial setup
+  include: initial-setup.yaml
+
 - hosts: all
   environment:
     OS_CLOUD: devstack-admin
@@ -6,8 +9,15 @@
   tasks:
     - include_tasks: ssh-key.yaml
 
+    - include_tasks: centos-image.yaml
+      when:
+        - metalsmith_whole_disk_image is defined
+        - metalsmith_partition_image is defined
+
     - include_tasks: cirros-image.yaml
-      when: metalsmith_whole_disk_image is not defined
+      when:
+        - metalsmith_whole_disk_image is undefined
+        - metalsmith_partition_image is undefined
 
     - name: Test a whole-disk image
       include_tasks: exercise.yaml