Add auto-fixing implementation for partial-become rule

.github/workflows/tox.yml

@@ -71,7 +71,7 @@ jobs:
       WSLENV: FORCE_COLOR:PYTEST_REQPASS:TOXENV:GITHUB_STEP_SUMMARY
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
-      PYTEST_REQPASS: 821
+      PYTEST_REQPASS: 822
     steps:
       - name: Activate WSL1
         if: "contains(matrix.shell, 'wsl')"

examples/playbooks/rule-partial-become-without-become-fail.yml

@@ -1,28 +1,27 @@
 ---
-- hosts: localhost
-  name: Use of become_user without become play
+- name: Use of become_user without become at play level
+  hosts: localhost
   become_user: root
 
   tasks:
-    - ansible.builtin.debug:
+    - name: A task without issues
+      ansible.builtin.debug:
         msg: hello
 
-- hosts: localhost
-
+- name: Use of become_user without become at task level
+  hosts: localhost
   tasks:
     - name: Use of become_user without become task
       ansible.builtin.command: whoami
       become_user: postgres
       changed_when: false
 
-- hosts: localhost
-
+- name: Use of become_user without become at task level
+  hosts: localhost
   tasks:
     - name: A block with become and become_user on different tasks
       block:
         - name: Sample become
-          become: true
-          ansible.builtin.command: whoami
-        - name: Sample become_user
-          become_user: postgres
           ansible.builtin.command: whoami
+          become_user: true
+          changed_when: false

examples/playbooks/rule-partial-become-without-become-pass.yml

@@ -1,35 +1,39 @@
 ---
-- hosts: localhost
+- name: Test play
+  hosts: localhost
   become_user: root
   become: true
 
   tasks:
-    - ansible.builtin.debug:
+    - name: Debug
+      ansible.builtin.debug:
         msg: hello
 
-- hosts: localhost
-
+- name: Test play
+  hosts: localhost
   tasks:
     - name: Foo
       ansible.builtin.command: whoami
       become_user: postgres
       become: true
       changed_when: false
 
-- hosts: localhost
-  become: true
+- name: Test play
+  hosts: localhost
 
   tasks:
     - name: Accepts a become from higher scope
       ansible.builtin.command: whoami
-      become_user: postgres
       changed_when: false
 
-- hosts: localhost
+- name: Test play
+  hosts: localhost
   become_user: postgres
+  become: true
 
   tasks:
     - name: Accepts a become from a lower scope
       ansible.builtin.command: whoami
       become: true
+      become_user: root
       changed_when: false

examples/playbooks/tasks/partial_become.yml/main.yml

@@ -0,0 +1,4 @@
+---
+- name: Included with partial become
+  ansible.builtin.debug:
+    msg: Included with partial become

examples/playbooks/transform-partial-become.transformed.yml

@@ -0,0 +1,56 @@
+---
+# The play has become_user and the task has become
+# this is fixable, copy the become_user to the task
+# and remove from the play
+- name: Play 1
+  hosts: localhost
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become: true
+          become_user: root
+
+# The task has become_user but the play does not
+# this is fixable, remove the become_user from the task
+- name: Play 2
+  hosts: localhost
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+
+# The task has become_user and the play has become
+# this is fixable, add become to the task
+- name: Play 3
+  hosts: localhost
+  become: true
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become: true
+          become_user: root
+
+# The play has become_user but has an include
+# this is not fixable, the include could be called from multiple playbooks
+- name: Play 4
+  hosts: localhost
+  become_user: root
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become: true
+
+        - name: Include
+          ansible.builtin.include_tasks:
+            file: ../tasks/partial_become/main.yml

examples/playbooks/transform-partial-become.yml

@@ -0,0 +1,56 @@
+---
+# The play has become_user and the task has become
+# this is fixable, copy the become_user to the task
+# and remove from the play
+- name: Play 1
+  hosts: localhost
+  become_user: root
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become: true
+
+# The task has become_user but the play does not
+# this is fixable, remove the become_user from the task
+- name: Play 2
+  hosts: localhost
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become_user: root
+
+# The task has become_user and the play has become
+# this is fixable, add become to the task
+- name: Play 3
+  hosts: localhost
+  become: true
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become_user: root
+
+# The play has become_user but has an include
+# this is not fixable, the include could be called from multiple playbooks
+- name: Play 4
+  hosts: localhost
+  become_user: root
+  tasks:
+    - name: A block
+      block:
+        - name: Debug
+          ansible.builtin.debug:
+            msg: hello
+          become: true
+
+        - name: Include
+          ansible.builtin.include_tasks:
+            file: ../tasks/partial_become/main.yml

src/ansiblelint/rules/partial_become.md

@@ -5,6 +5,13 @@ This rule checks that privilege escalation is activated when changing users.
 To perform an action as a different user with the `become_user` directive, you
 must set `become: true`.
 
+This rule can produce the following messages:
+
+- `partial-become[play]`: become_user requires become to work as expected, at
+  play level.
+- `partial-become[task]`: become_user requires become to work as expected, at
+  task level.
+
 !!! warning
 
     While Ansible inherits have of `become` and `become_user` from upper levels,
@@ -19,12 +26,13 @@ must set `become: true`.
 ---
 - name: Example playbook
   hosts: localhost
+  become: true # <- Activates privilege escalation.
   tasks:
     - name: Start the httpd service as the apache user
       ansible.builtin.service:
         name: httpd
         state: started
-        become_user: apache # <- Does not change the user because "become: true" is not set.
+      become_user: apache # <- Does not change the user because "become: true" is not set.
 ```
 
 ## Correct Code
@@ -37,6 +45,78 @@ must set `become: true`.
       ansible.builtin.service:
         name: httpd
         state: started
-        become: true # <- Activates privilege escalation.
-        become_user: apache # <- Changes the user with the desired privileges.
+      become: true # <- Activates privilege escalation.
+      become_user: apache # <- Changes the user with the desired privileges.
+
+# Stand alone playbook alternative, applies to all tasks
+
+- name: Example playbook
+  hosts: localhost
+  become: true # <- Activates privilege escalation.
+  become_user: apache # <- Changes the user with the desired privileges.
+  tasks:
+    - name: Start the httpd service as the apache user
+      ansible.builtin.service:
+        name: httpd
+        state: started
+```
+
+## Problematic Code
+
+```yaml
+---
+- name: Example playbook 1
+  hosts: localhost
+  become: true # <- Activates privilege escalation.
+  tasks:
+    - name: Include a task file
+      ansible.builtin.include_tasks: tasks.yml
+```
+
+```yaml
+---
+- name: Example playbook 2
+  hosts: localhost
+  tasks:
+    - name: Include a task file
+      ansible.builtin.include_tasks: tasks.yml
+```
+
+```yaml
+# tasks.yml
+- name: Start the httpd service as the apache user
+  ansible.builtin.service:
+    name: httpd
+    state: started
+  become_user: apache # <- Does not change the user because "become: true" is not set.
+```
+
+## Correct Code
+
+```yaml
+---
+- name: Example playbook 1
+  hosts: localhost
+  tasks:
+    - name: Include a task file
+      ansible.builtin.include_tasks: tasks.yml
+```
+
+```yaml
+---
+- name: Example playbook 2
+  hosts: localhost
+  tasks:
+    - name: Include a task file
+      ansible.builtin.include_tasks: tasks.yml
+```
+
+```yaml
+# tasks.yml
+- name: Start the httpd service as the apache user
+  ansible.builtin.service:
+    name: httpd
+    state: started
+  become: true # <- Activates privilege escalation.
+  become_user: apache # <- Does not change the user because "become: true" is not set.
 ```