examples/OSPolicyAssignments/gcloud/change_group.yaml

# OS policy assignment that sets the /var/log/auth.log group to logaccess.
osPolicies:
 - id: log-access-policy
   mode: ENFORCEMENT
   resourceGroups:
       resources:
         - id: grant-log-access
           exec:
             validate:
               # Checks if the group is logaccess. If yes, exits  with code 100. If no,
               # exits with code 101 and proceeds to the `enforce` step.
               script:
                 if stat -c '%G' /var/log/auth.log | grep -q 'logaccess'; then exit 100; else exit 101; fi
               interpreter: SHELL
             enforce:
               # Changes the group to logaccess and exits with code 100.
               script:
                 chgrp logaccess /var/log/auth.log && exit 100
instanceFilter:
 inclusionLabels:
   - labels:
       vm: tutorial
rollout:
 disruptionBudget:
   fixed: 10
 minWaitDuration: 30s