new: [postgres] allow relation options ``encoding``, ``lc-collate``, ``lc-ctype``, ``template``

These options are only used upon creation of the database.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

postgres/hooks/postgres_database-relation-joined

@@ -51,8 +51,15 @@ ensure_db_docker_running
 
 ## XXXvlab: should send all these into only one docker...
 if ! db_has_database "$DBNAME"; then
-    db_create "$DBNAME" || exit 1
-
+    INITDB_ARGS=(encoding lc-collate lc-ctype template)
+    CREATEDB_OPTS=()
+    for option in "${INITDB_ARGS[@]}"; do
+        value="$(relation-get "$option" 2>/dev/null)" || true
+        if [ -n "$value" ]; then
+            CREATEDB_OPTS+=("--$option=$value")
+        fi
+    done
+    db_create "$DBNAME" "${CREATEDB_OPTS[@]}" || exit 1
     if sql=$(relation-get init-sql); then
         ddb "$DBNAME" > /dev/null < <(e "$sql") || exit 1
     fi

postgres/lib/common

@@ -63,7 +63,8 @@ db_drop () {
 
 db_create () {
     local dbname="$1"
-    dcmd createdb "$dbname" || return 1
+    shift
+    dcmd createdb "$dbname" "$@" || return 1
     info "Database '$dbname' created."
 }