debugging for not enough disks

tests/get_unused_disk.yml

@@ -38,11 +38,17 @@
     unused_disks: "{{ unused_disks_return.disks }}"
   when: "'Unable to find unused disk' not in unused_disks_return.disks"
 
+- name: Print unused disks
+  debug:
+    var: unused_disks
+    verbosity: 2
+
+- name: Print info from find_unused_disk
+  debug:
+    var: unused_disks_return.info
+  when: unused_disks_return.info | d([]) | length > 0
+
 - name: Exit playbook when there's not enough unused disks in the system
   fail:
     msg: "Unable to find enough unused disks. Exiting playbook."
   when: unused_disks | d([]) | length < disks_needed | d(1)
-
-- name: Print unused disks
-  debug:
-    var: unused_disks

tests/library/find_unused_disk.py

@@ -185,37 +185,47 @@ def run_module():
     module = AnsibleModule(argument_spec=module_args, supports_check_mode=True)
 
     max_size = Size(module.params["max_size"])
+    info = []
     for path, attrs in get_disks(module).items():
         if is_ignored(path):
+            info.append("Disk {} attrs {} is ignored".format(path, attrs))
             continue
 
         interface = module.params["with_interface"]
 
         if interface is not None and not is_device_interface(module, path, interface):
+            info.append("Disk {} attrs {} is not an interface {}".format(path, attrs, interface))
             continue
 
         if attrs["fstype"]:
+            info.append("Disk {} attrs {} has fstype".format(path, attrs))
             continue
 
         if Size(attrs["size"]).bytes < Size(module.params["min_size"]).bytes:
+            info.append("Disk {} attrs {} size is less than requested".format(path, attrs))
             continue
 
         if max_size.bytes > 0 and Size(attrs["size"]).bytes > max_size.bytes:
+            info.append("Disk {} attrs {} size is greater than requested".format(path, attrs))
             continue
 
         if get_partitions(path):
+            info.append("Disk {} attrs {} has partitions".format(path, attrs))
             continue
 
         if not no_holders(get_sys_name(path)):
+            info.append("Disk {} attrs {} has holders".format(path, attrs))
             continue
 
         if not can_open(path):
+            info.append("Disk {} attrs {} cannot be opened exclusively".format(path, attrs))
             continue
 
         result["disks"].append(os.path.basename(path))
         if len(result["disks"]) >= module.params["max_return"]:
             break
 
+    result["info"] = info
     if not result["disks"]:
         result["disks"] = "Unable to find unused disk"
     else: