added DB_TEMPLATE variable to specify the database template

Author: Sameer Naik

Changelog.md

@@ -2,6 +2,7 @@
 
 **latest**
 - removed use of single-user mode
+- added `DB_TEMPLATE` variable to specify the database template
 
 **9.4-11**
 - added `PG_PASSWORD` variable to specify password for `postgres` user

README.md

@@ -159,6 +159,8 @@ docker run --name postgresql -itd --restart always \
   sameersbn/postgresql:9.4-11
 ```
 
+By default databases are created by copying the standard system database named `template1`. You can specify a different template for your database using the `DB_TEMPLATE` parameter. Refer to [Template Databases](http://www.postgresql.org/docs/9.4/static/manage-ag-templatedbs.html) for further information.
+
 Additionally, more than one database can be created by specifying a comma separated list of database names in `DB_NAME`. For example, the following command creates two new databases named `dbname1` and `dbname2`.
 
 *This feature is only available in releases greater than `9.1-1`*

docker-compose.yml

@@ -9,6 +9,7 @@ PostgreSQL:
     - DB_USER=
     - DB_PASS=
     - DB_NAME=
+    - DB_TEMPLATE=
 
     - DB_UNACCENT=
 

runtime/env-defaults

@@ -16,5 +16,6 @@ REPLICATION_SSLMODE=${REPLICATION_SSLMODE:-prefer}
 DB_NAME=${DB_NAME:-}
 DB_USER=${DB_USER:-}
 DB_PASS=${DB_PASS:-}
+DB_TEMPLATE=${DB_TEMPLATE:-template1}
 
 DB_UNACCENT=${DB_UNACCENT:-false}

runtime/functions

@@ -316,7 +316,7 @@ create_database() {
         for database in $(awk -F',' '{for (i = 1 ; i <= NF ; i++) print $i}' <<< "${DB_NAME}"); do
           echo -n "${database} "
           if [[ -z $(psql -U ${PG_USER} -Atc "SELECT 1 FROM pg_catalog.pg_database WHERE datname = '${DB_NAME}'";) ]]; then
-            psql -U ${PG_USER} -c "CREATE DATABASE \"${database}\";" >/dev/null
+            psql -U ${PG_USER} -c "CREATE DATABASE \"${database}\" WITH TEMPLATE = \"${DB_TEMPLATE}\";" >/dev/null
           fi
 
           if [[ ${DB_UNACCENT} == true ]]; then