PostgreSQL tests: enforce UTF8

By default, client encoding is determined either from the LANG_*/LC_*
environment variables or using encoding of the database.

Containers used in the CI don't define a default locale, then encoding
of default databases was SQL_ASCII.

test/integration/targets/postgresql/tasks/test_user.yml

@@ -3,12 +3,6 @@
       become_user: "{{ pg_user }}"
       become: True
       register: result
-    task_parameters_readonly: &task_parameters_readonly
-      become_user: "{{ pg_user }}"
-      become: True
-      register: result
-      environment:
-        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
     postgresql_parameters: &parameters
       db: postgres
       name: "{{ db_user1 }}"
@@ -16,11 +10,14 @@
 
   block: # block is only used here in order to be able to define YAML anchors at the beginning in 'vars' section
   - name: 'Check that PGOPTIONS environment variable is effective (1/2)'
-    <<: *task_parameters_readonly
+    <<: *task_parameters
     postgresql_user:
       <<: *parameters
       password: '{{ db_password1 }}'
     ignore_errors: true
+    environment:
+      PGCLIENTENCODING: 'UTF8'
+      PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
   - name: 'Check that PGOPTIONS environment variable is effective (2/2)'
     assert:
@@ -33,6 +30,8 @@
       <<: *parameters
       password: '{{ db_password1 }}'
       encrypted: '{{ encrypted }}'
+    environment:
+      PGCLIENTENCODING: 'UTF8'
 
   - block: &changed # block is only used here in order to be able to define YAML anchor
     - name: Check that ansible reports it was created
@@ -49,11 +48,14 @@
         - "result.stdout_lines[-1] == '(1 row)'"
 
   - name: Check that creating user a second time does nothing
-    <<: *task_parameters_readonly
+    <<: *task_parameters
     postgresql_user:
       <<: *parameters
       password: '{{ db_password1 }}'
       encrypted: '{{ encrypted }}'
+    environment:
+      PGCLIENTENCODING: 'UTF8'
+      PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
   - block: &not_changed # block is only used here in order to be able to define YAML anchor
     - name: Check that ansible reports no change
@@ -64,29 +66,36 @@
   - block:
 
     - name: 'Using MD5-hashed password: check that password not changed when using cleartext password'
-      <<: *task_parameters_readonly
+      <<: *task_parameters
       postgresql_user:
         <<: *parameters
         password: '{{ db_password1 }}'
         encrypted: 'yes'
+      environment:
+#        PGCLIENTENCODING: 'UTF8'
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
     - <<: *not_changed
 
     - name: "Using MD5-hashed password: check that password not changed when using md5 hash with 'ENCRYPTED'"
-      <<: *task_parameters_readonly
+      <<: *task_parameters
       postgresql_user:
         <<: *parameters
         password: "md5{{ (db_password1 ~ db_user1) | hash('md5')}}"
         encrypted: 'yes'
+      environment:
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
     - <<: *not_changed
 
     - name: "Using MD5-hashed password: check that password not changed when using md5 hash with 'UNENCRYPTED'"
-      <<: *task_parameters_readonly
+      <<: *task_parameters
       postgresql_user:
         <<: *parameters
         password: "md5{{ (db_password1 ~ db_user1) | hash('md5')}}"
         encrypted: 'no'
+      environment:
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
     - <<: *not_changed
 
@@ -96,6 +105,8 @@
         <<: *parameters
         password: 'prefix{{ db_password1 }}'
         encrypted: 'yes'
+      environment:
+        PGCLIENTENCODING: 'UTF8'
 
     - <<: *changed
 
@@ -122,11 +133,14 @@
   - block:
 
     - name: 'Using cleartext password: check that password not changed when using cleartext password'
-      <<: *task_parameters_readonly
+      <<: *task_parameters
       postgresql_user:
         <<: *parameters
         password: "{{ db_password1 }}"
         encrypted: 'no'
+      environment:
+        PGCLIENTENCODING: 'UTF8'
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
     - <<: *not_changed
 
@@ -136,6 +150,8 @@
         <<: *parameters
         password: "changed{{ db_password1 }}"
         encrypted: 'no'
+      environment:
+        PGCLIENTENCODING: 'UTF8'
 
     - <<: *changed
 
@@ -150,17 +166,21 @@
   - <<: *changed
 
   - name: Check that they were removed
-    <<: *task_parameters_readonly
+    <<: *task_parameters
     shell: echo "select * from pg_user where usename='{{ db_user1 }}';" | psql -d postgres
+    environment:
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
   - assert:
       that:
         - "result.stdout_lines[-1] == '(0 rows)'"
 
   - name: Check that removing user a second time does nothing
-    <<: *task_parameters_readonly
+    <<: *task_parameters
     postgresql_user:
       state: 'absent'
       <<: *parameters
+    environment:
+        PGOPTIONS: '-c default_transaction_read_only=on' # ensure 'alter user' query isn't executed
 
   - <<: *not_changed