[stable-2.17] debconf: handle boolean value representation consistently (#83628)

* lift code that normalizes value type for boolean vtype to cover both
  branches of conditional.
* remove obsolete and incomplete conversion of type in set_selection.

Fixes: #83594
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
(cherry picked from commit c904bffc7d)

Co-authored-by: Peter A. Bigot <pab@pabigot.com>

changelogs/fragments/83601-debconf-normalize-bools.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - debconf - fix normalization of value representation for boolean vtypes in new packages (https://github.com/ansible/ansible/issues/83594)

lib/ansible/modules/debconf.py

@@ -173,8 +173,6 @@ def set_selection(module, pkg, question, vtype, value, unseen):
     if unseen:
         cmd.append('-u')
 
-    if vtype == 'boolean':
-        value = value.lower()
     data = ' '.join([pkg, question, vtype, value])
 
     return module.run_command(cmd, data=data)
@@ -209,15 +207,17 @@ def main():
         if vtype is None or value is None:
             module.fail_json(msg="when supplying a question you must supply a valid vtype and value")
 
+        # ensure we compare booleans supplied to the way debconf sees them (true/false strings)
+        if vtype == 'boolean':
+            value = to_text(value).lower()
+
         # if question doesn't exist, value cannot match
         if question not in prev:
             changed = True
         else:
             existing = prev[question]
 
-            # ensure we compare booleans supplied to the way debconf sees them (true/false strings)
             if vtype == 'boolean':
-                value = to_text(value).lower()
                 existing = to_text(prev[question]).lower()
             elif vtype == 'password':
                 existing = get_password_value(module, pkg, question, vtype)

test/integration/targets/debconf/tasks/main.yml

@@ -146,6 +146,32 @@
           - not debconf_multiselect_test_idem_4.changed
           - '"Invalid value provided" in debconf_multiselect_test_idem_4.msg'
 
+    - name: Boolean vtype from boolean value
+      debconf:
+        name: libnns-ldap
+        question: libnss-ldapd/clean_nsswitch
+        vtype: boolean
+        value: true
+      register: debconf_bool_test_bool_1
+
+    - name: validate results for boolean vtype from boolean value
+      assert:
+        that:
+          - debconf_bool_test_bool_1.changed
+
+    - name: Boolean vtype from string value
+      debconf:
+        name: libnns-ldap
+        question: libnss-ldapd/clean_nsswitch
+        vtype: boolean
+        value: "FALSE"
+      register: debconf_bool_test_bool_2
+
+    - name: validate results for boolean vtype from string value
+      assert:
+        that:
+          - debconf_bool_test_bool_2.changed
+
   always:
     - name: uninstall debconf-utils
       apt: