fix: #262 Add option for DB_AUTH in PGSQL

Author: alwynpan

README.md

@@ -156,7 +156,7 @@ Be sure to view the following repositories to understand all the customizable op
 
 | Parameter          | Description                                                                                                                                                                           | Default | `_FILE` |
 | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- |
-| `DB_AUTH`          | (Mongo Only - Optional) Authentication Database                                                                                                                                       |         |         |
+| `DB_AUTH`          | (Mongo/PGSQL Only - Optional) Authentication Database                                                                                                                                 |         |         |
 | `DB_TYPE`          | Type of DB Server to backup `couch` `influx` `mysql` `mssql` `pgsql` `mongo` `redis` `sqlite3`                                                                                        |         |         |
 | `DB_HOST`          | Server Hostname e.g. `mariadb`. For `sqlite3`, full path to DB file e.g. `/backup/db.sqlite3`                                                                                         |         | x       |
 | `DB_NAME`          | Schema Name e.g. `database` or `ALL` to backup all databases the user has access to. Backup multiple by separating with commas eg `db1,db2`                                           |         | x       |
@@ -205,7 +205,7 @@ Your Organization will be mapped to `DB_USER` and your root token will need to b
 | `MYSQL_SINGLE_TRANSACTION`     | Backup in a single transaction with MySQL / MariaDB                                                                          | `TRUE`                    |         |
 | `MYSQL_STORED_PROCEDURES`      | Backup stored procedures with MySQL / MariaDB                                                                                | `TRUE`                    |         |
 | `MYSQL_ENABLE_TLS`             | Enable TLS functionality for MySQL client                                                                                    | `FALSE`                   |         |
-| `MYSQL_TLS_VERIFY`             | (optional) If using TLS (by means of MYSQL*TLS*\* variables) verify remote host                                              | `FALSE`                   |         |
+| `MYSQL_TLS_VERIFY`             | (optional) If using TLS (by means of MYSQL_TLS_* variables) verify remote host                                               | `FALSE`                   |         |
 | `MYSQL_TLS_VERSION`            | What TLS `v1.1` `v1.2` `v1.3` version to utilize                                                                             | `TLSv1.1,TLSv1.2,TLSv1.3` |         |
 | `MYSQL_TLS_CA_FILE`            | Filename to load custom CA certificate for connecting via TLS                                                                | `/etc/ssl/cert.pem`       | x       |
 | `MYSQL_TLS_CERT_FILE`          | Filename to load client certificate for connecting via TLS                                                                   |                           | x       |

install/assets/functions/10-db-backup

@@ -298,8 +298,12 @@ backup_mysql() {
 }
 
 backup_pgsql() {
-  export PGPASSWORD=${DB_PASS}
-  authdb=${DB_USER}
+    export PGPASSWORD=${DB_PASS}
+    if [ -n "${DB_AUTH}" ] ; then
+        authdb=${DB_AUTH}
+    else
+        authdb=${DB_USER}
+    fi
     if [ "${DB_NAME,,}" = "all" ] ; then
         print_debug "Preparing to back up all databases"
         db_names=$(psql -h ${DB_HOST} -U ${DB_USER} -p ${DB_PORT} -d ${authdb} -c 'COPY (SELECT datname FROM pg_database WHERE datistemplate = false) TO STDOUT;' )
@@ -341,7 +345,7 @@ backup_pgsql() {
         pre_dbbackup all
         print_notice "Dumping all PostgreSQL databases: '$(echo ${db_names} | xargs | tr ' ' ',')' ${compression_string}"
         tmp_db_names=$(psql -h ${DB_HOST} -U ${DB_USER} -p ${DB_PORT} -d ${authdb} -c 'COPY (SELECT datname FROM pg_database WHERE datistemplate = false) TO STDOUT;' )
-        for r_db_name in $(echo $db_names  | xargs); do
+        for r_db_name in $(echo $db_names | xargs); do
             tmp_db_names=$(echo "$tmp_db_names" | xargs | sed "s|${r_db_name}||g"  )
         done
         sleep 5