shake-build: add shake_target variable

This change enable user to specify custom shake target.

Change-Id: I1feb24cd2c66e58da130079e85de844dfd5c6792

roles/shake-build/README.rst

@@ -7,6 +7,10 @@ Run the shake build system command.
 
    The name of the report.
 
+.. zuul:rolevar:: shake_target
+
+   The name of the target to build.
+
 .. zuul:rolevar:: zuul_work_dir
    :default: {{ zuul.project.src_dir }}
 

roles/shake-build/defaults/main.yaml

@@ -1,3 +1,4 @@
 shake_report_name: "shake.html"
+shake_target: ""
 
 zuul_work_dir: "{{ zuul.project.src_dir }}"

roles/shake-build/tasks/main.yaml

@@ -1,6 +1,6 @@
 - block:
     - name: Run shake
-      command: "shake --report={{ report_location }}"
+      command: "shake --report={{ report_location }} {{ shake_target }}"
       vars:
         report_location: "{{ ansible_user_dir }}/zuul-output/logs/{{ shake_report_name }}"
       args:

zuul.d/general-jobs.yaml

@@ -124,5 +124,10 @@
       Run the shake build system command.
 
       This job produces a shake.html report.
+
+      .. zuul:jobvar:: shake_target
+
+         The name of the target to build.
+
     pre-run: playbooks/shake/pre.yaml
     run: playbooks/shake/run.yaml