[dev-db/postgresql] add from pr with improved init script

dev-db/postgresql/files/postgresql-check-db-dir

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Copyright 1999-2014 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+eerror() {
+    echo "$@" >&2
+}
+
+# Check that DATA_DIR has been set
+if [ -z ${DATA_DIR} ] ; then
+    eerror "DATA_DIR not set"
+    exit 1
+fi
+
+# Check that DATA_DIR exists
+if [ ! -d ${DATA_DIR} ] ; then
+    eerror "Directory not found: ${DATA_DIR}"
+    eerror "HINT: Ensure that DATA_DIR points to the right path."
+    eerror "HINT: Or perhaps you need to create the database cluster:"
+    eerror "    emerge --config dev-db/postgresql:@SLOT@"
+    exit 1
+fi
+
+# Check for the existence of PostgreSQL's config files, and set the
+# proper mode and ownership.
+# Only three files should be checked as potentially other files
+# may be in PGDATA that should not be touched.
+for file in postgresql pg_hba pg_ident ; do
+    file="${PGDATA%/}/${file}.conf"
+    if [ ! -f ${file} ] ; then
+        eerror "${file} not found"
+        eerror "HINT: mv ${DATA_DIR%/}/*.conf ${PGDATA}"
+        exit 1
+    fi
+done