Merge pull request 'backup and clean of wal files' (!1) from tpiccioli/ansible-role-postgresql:master into master

Reviewed-on: ISTI-ansible-roles/ansible-role-postgresql#1

files/backuppc_pg_wal.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+su - postgres -c "/usr/local/sbin/postgresql_wal_backup_and_removal > /var/log/postgresql/wal_removal.log 2>&1"
+

tasks/postgresql-backup.yml

@@ -43,6 +43,15 @@
   when: psql_wal_files_archiving_enabled
   tags: [ 'pg_backup', 'postgresql', 'postgres' ]
 
+- name: Backup script for the postgresql streaming replication database(s)
+  template: src=postgresql_wal_backup_and_removal.j2 dest=/usr/local/sbin/postgresql_wal_backup_and_removal owner=root mode=0744
+  tags: [ 'pg_stream_backup', 'postgresql', 'postgres' ]
+
+- name: backuppc root script for the postgresql streaming replication database(s)
+  copy: src=backuppc_pg_wal.sh dest=/usr/local/sbin/backuppc_pg_wal.sh owner=root mode=0744
+  when: psql_wal_files_archiving_enabled
+  tags: [ 'pg_stream_backup', 'postgresql', 'postgres' ]
+
 - name: authorization file for the psql command
   template: src=pgpass.j2 dest={{ pg_backup_pass_file }} owner=root mode=0600
   tags: [ 'pg_backup', 'postgresql', 'postgres', 'pgpass', 'pg_db' ]

templates/postgresql_wal_backup_and_removal.j2

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+BASE_BACKUP_DIR={{ psql_base_backup_dir }}
+WAL_ARCHIVES_LOG_DIR={{ psql_wal_archiving_log_dir }}
+WAL_LATEST_BACKUP=
+
+# The base backup dir needs to be empty
+
+rm -f $BASE_BACKUP_DIR/*
+pg_basebackup -F t -z -D $BASE_BACKUP_DIR
+
+cd $WAL_ARCHIVES_LOG_DIR
+WAL_LATEST_BACKUP=$( /bin/ls -1tr *.backup | tail -1 )
+pg_archivecleanup $WAL_ARCHIVES_LOG_DIR $WAL_LATEST_BACKUP
+
+exit $?
+
+