Collect logs: Handle errors and timeout

currently if the collect logs script has error or is timing out, none of
the copy tasks are run, and we may end up with no logs at all even on
the log collection itself.
This patch encloses the log collection within a block to handle errors,
and runs the script with a specified timeout, to always leave some time
for copying what logs we have from the node to the executor

Change-Id: I428bd0aa8e35a2a94f2cf3039dd9e3ae683334a6

playbooks/tripleo-ci/post.yaml

@@ -8,6 +8,10 @@
 - name: Collect logs
   hosts: primary
   tasks:
+    - name: set collection timeout
+      set_fact:
+        collect_timeout_sec: "{{ zuul.post_timeout|default(3600) -  copy_logs_time|default(300) }}"
+
     - name: Copy zuul_console_json log to workspace for reproducer
       copy:
         content: "{{ hostvars['localhost'].zuul_console_json }}"
@@ -36,12 +40,33 @@
         fi
       when: environment_type != "ovb" or not undercloud_logs.stat.exists
 
+    - name: Check script existence
+      stat:
+        path: "{{ ansible_user_dir  }}/workspace/logs/collect_logs.sh"
+      register: collect_logs_path
 
-- hosts:
+    - name: Collect logs with a timeout
-    - primary
+      block:
-    - centos-7
+        - name: Run ansible playbook to collect logs
-  tasks:
+          shell: |
+              timeout --preserve-status -s 15 \
+                -k {{ [collect_timeout_sec|int, 60]|sum|string }} {{ collect_timeout_sec|string }} \
+                bash {{ ansible_user_dir }}/workspace/logs/collect_logs.sh
+          when: collect_logs_path.stat.exists
+          register: collect_logs_run
 
+      rescue:
+        - name: warn when collect logs timed out (SIGTERM or SIGKILL used)
+          debug:
+            msg: "ERROR: Collect logs timed out"
+          when: collect_logs_path.stat.exists and (collect_logs_run.rc == 143 or collect_logs_run.rc == 137)
+
+        - name: warn when collect logs failed
+          debug:
+            msg: "ERROR: Collect logs failed, please check the logs"
+          when: collect_logs_path.stat.exists and collect_logs_run.rc != 143 and collect_logs_run.rc != 137
+
+      always:
         - name: Ensure artifacts directory exists
           file:
             path: '{{ zuul.executor.work_root }}/artifacts'