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--- docs:tips_n_tricks:ansible:shell.html [25.11.2023 15:22 CET] – peter
+++ docs:tips_n_tricks:ansible:shell.html [25.11.2023 15:45 CET] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Ansible - shell scripts ======
-===== Task Template capable of check mode and reporting changed state =====
+===== Task template capable of check mode and reporting changed state =====
 <note tip>This template assumes, that "CHANGED" and "FAILED" are on a line by itself, which isn't true if some other part of the script had some output not delimited by a newline</note>
 <code yaml roles/templates/tasks/shell1.yml>
-- name: You name it
+- name: Shell scriptlet
   shell: |
     if echo "Fake check for need of change - always true"
@@ Line 17: / Line 17: @@
   changed_when: "'CHANGED' in my_result.stdout_lines"
   failed_when: "'FAILED' in my_result.stderr_lines"
+</code>
+===== Task template executing always - even in check mode - and failing on any output to stderr =====
+This might be useful when using a script to gather information about the target host
+<code yaml roles/templates/tasks/shell2.yml>
+- name: Collect information
+  shell: |
+    echo '{"name": "Test", "msg": "Do the real thing here"}' ||  echo "FAILED" >&2
+  check_mode: False
+  register: last_result
+  changed_when: False
+  failed_when: "last_result.stderr_lines | length > 0"
+- name: Add to list if name does not exist
+  set_fact:
+    list_of_information: "{{ list_of_information + [ item ] }}"
+  loop: "{{ last_result.stdout_lines | from_json }}"
+  when: "item.name not in list_of_information | map(attribute='name')"
 </code>
 {{tag>Ansible Shell}}
 {{entry>Ansible}}
 {{entry>Shell}}