Create zuul_workspace_root job variable

This will be a top-level variable used to define the workspace root
for our zuul user.

Change-Id: I4ecd6ead4975691798404f8d9510ed47e20e0c0c
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -5,6 +5,8 @@
     success-url: http://zuulv3-dev.openstack.org/logs/{build.uuid}/
     failure-url: http://zuulv3-dev.openstack.org/logs/{build.uuid}/
     timeout: 1800
+    vars:
+      zuul_workspace_root: /home/zuul
     nodes:
       - name: ubuntu-xenial
         image: ubuntu-xenial

playbooks/roles/extra-test-setup/tasks/main.yaml

@@ -1,13 +1,13 @@
 ---
-- name: Check if tools/test-setup.sh exists.
+- name: Check if projects tools/test-setup.sh exists.
   stat:
-    path: "/home/zuul/workspace/src/{{ zuul.project }}/tools/test-setup.sh"
+    path: "{{ zuul_workspace_root }}/src/{{ zuul.project }}/tools/test-setup.sh"
   register: p
 
 - name: Run tools/test-setup.sh.
   shell: tools/test-setup.sh
   args:
-    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"
+    chdir: "{{ zuul_workspace_root }}/src/{{ zuul.project }}"
   when:
     - p.stat.exists
     - p.stat.executable

playbooks/roles/prepare-workspace/defaults/main.yaml

@@ -1,3 +0,0 @@
----
-# tasks/main.yaml
-prepare_workspace_root: /home/zuul/workspace

playbooks/roles/prepare-workspace/tasks/main.yaml

@@ -10,12 +10,12 @@
 
 - name: Create workspace directory.
   file:
-    path: "{{ prepare_workspace_root }}"
+    path: "{{ zuul_workspace_root }}"
     owner: zuul
     group: zuul
     state: directory
 
 - name: Synchronize src repos to workspace directory.
   synchronize:
-    dest: "{{ prepare_workspace_root }}"
+    dest: "{{ zuul_workspace_root }}"
     src: "{{ zuul.executor.src_root }}"

playbooks/roles/run-bindep/tasks/main.yaml

@@ -2,4 +2,4 @@
 - name: Run install-distro-packages.sh
   shell: /usr/local/jenkins/slave_scripts/install-distro-packages.sh
   args:
-    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"
+    chdir: "{{ zuul_workspace_root }}/src/{{ zuul.project }}"

playbooks/roles/run-cover/tasks/main.yaml

@@ -1,4 +1,4 @@
 - name: Execute run-cover.sh.
   shell: "/usr/local/jenkins/slave_scripts/run-cover.sh {{ run_cover_envlist }}"
   args:
-    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"
+    chdir: "{{ zuul_workspace_root }}/src/{{ zuul.project }}"

playbooks/roles/run-docs/tasks/main.yaml

@@ -1,4 +1,4 @@
 - name: Execute run-docs.sh.
   shell: "/usr/local/jenkins/slave_scripts/run-docs.sh {{ run_docs_envlist }}"
   args:
-    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"
+    chdir: "{{ zuul_workspace_root }}/src/{{ zuul.project }}"

playbooks/roles/run-tox/tasks/main.yaml

@@ -1,4 +1,4 @@
 - name: Run tox
   shell: "/usr/local/jenkins/slave_scripts/run-tox.sh {{ run_tox_envlist }}"
   args:
-    chdir: "/home/zuul/workspace/src/{{ zuul.project }}"
+    chdir: "{{ zuul_workspace_root }}/src/{{ zuul.project }}"

playbooks/tox-post.yaml

@@ -3,7 +3,7 @@
     - name: Find tox directories to synchrionize.
       find:
         file_type: directory
-        paths: "/home/zuul/workspace/src/{{ zuul.project }}/.tox"
+        paths: "{{ zuul_workspace_root }}/src/{{ zuul.project }}/.tox"
         # NOTE(pabelanger): The .tox/log folder is empty, ignore it.
         patterns: ^(?!log).*$
         use_regex: yes