Variable overrides for Arch Linux

Part of #2550

contrib/ci-workers/templates/buildbot-worker.service.j2

@@ -7,9 +7,9 @@ After=network.target
 Type=forking
 PIDFile=/home/{{ buildbot_worker_user }}/{{ buildbot_worker_name }}/twistd.pid
 WorkingDirectory=/home/{{ buildbot_worker_user }}
-ExecStart=/usr/local/bin/buildbot-worker start {{ buildbot_worker_name }}
-ExecReload=/usr/local/bin/buildbot-worker restart {{ buildbot_worker_name }}
-ExecStop=/usr/local/bin/buildbot-worker stop {{ buildbot_worker_name }}
+ExecStart={{ pip_bin_dir }}/buildbot-worker start {{ buildbot_worker_name }}
+ExecReload={{ pip_bin_dir }}/buildbot-worker restart {{ buildbot_worker_name }}
+ExecStop={{ pip_bin_dir }}/buildbot-worker stop {{ buildbot_worker_name }}
 Restart=always
 User={{ buildbot_worker_user }}
 

contrib/ci-workers/unix.yml

@@ -67,6 +67,12 @@
         package_deps: "{{ buildbot_deps + fetch_deps + conf_deps + build_deps + link_deps + dist_deps }}"
         python_modules: "{{ buildbot_modules + rpc_test_modules }}"
 
+    - name: Update rolling release [Arch Linux]
+      pacman:
+        update_cache: yes
+        upgrade: yes
+      when: ansible_distribution == 'Archlinux'
+
     - name: Install required packages
       package:
         name: "{{ item }}"

contrib/ci-workers/vars/Archlinux.yml

@@ -0,0 +1,7 @@
+---
+buildbot_deps:
+  - python2-pip
+build_deps:
+  - multilib/gcc
+  - make
+pip_bin_dir: /usr/bin

contrib/ci-workers/vars/default.yml

@@ -39,3 +39,6 @@ buildbot_modules:
 rpc_test_modules:
   - pyblake2
   - pyzmq
+
+# Environment variables
+pip_bin_dir: /usr/local/bin