postgresql: update to version 9.5.4 and major rework

* convert package build to use host-build for ecpg, pg_config and zic
 * introduce /lib/functions/postgresql.sh to be used by packages
   requiring a postgres database to exist as well as postgres' init
 * no longer require shadow-su, patch pg_ctl to setuid() ifself instead
 * auto-create database directory if there is enough free space
 * auto-create databases configured in UCI
 * remove some dead uci config options
 * grab maintainership

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libs/postgresql/files/postgresql.config

@@ -1,5 +1,2 @@
 config postgresql config
-	option PGUSER	postgres
 	option PGDATA	/var/postgresql/data
-	option PGLOG	/var/postgresql/data/postgresql.log
-	option PG_CTL	/usr/bin/pg_ctl

libs/postgresql/files/postgresql.init

@@ -26,48 +26,47 @@ cleanup() {
 }
 
 start_service() {
+	. /lib/functions/postgresql.sh
+
 	config_load "postgresql"
 	config_get pgdata config PGDATA
-	config_get pguser config PGUSER
-	config_get pgctl config PG_CTL
 	config_get pgopts config PGOPTS
 
 	user_exists postgres 5432 || user_add postgres 5432
 	group_exists postgres 5432 || group_add postgres 5432
 
-	if [ ! -d "${pgdata}" ]; then
-		echo "Create the data directory (${pgdata}) and try again"
-		return 1
-	fi
-
 	fix_perms
 	fix_hosts
 
-	procd_open_instance
+	if [ ! -d "${pgdata}" ]; then
+		pg_init_data ${pgdata}
+		[ $? -gt 0 ] && return 1
+	fi
 
-	procd_set_param user ${pguser}
+	cleanup "${pgdata}"
+
+	procd_open_instance
+	procd_set_param user postgres
 	procd_set_param command $PROG
 	procd_append_param command -D "${pgdata}"
 	[ -n "${pgopts}" ] && procd_append_param command -o "${pgopts}"
-
 	procd_set_param respawn retry=60
 	procd_close_instance
+
+	procd_open_instance
+	procd_set_param user postgres
+	procd_set_param command /lib/functions/postgresql.sh init "${pgdata}"
+	procd_close_instance
 }
 
 reload_service() {
 	config_load "postgresql"
 	config_get pgdata config PGDATA
-	config_get pguser config PGUSER
-	config_get pgctl config PG_CTL
-	${pgctl} reload -U ${pguser} -D '${pgdata}' -s
+	/usr/bin/pg_ctl reload -U postgres -D "${pgdata}" -s
 }
 
 status() {
 	config_load "postgresql"
 	config_get pgdata config PGDATA
-	config_get pguser config PGUSER
-	config_get pgctl config PG_CTL
-	echo "status postgres..."
-	${pgctl} status -U ${pguser} -D '${pgdata}'
-	echo "ok"
+	/usr/bin/pg_ctl status -U postgres -D "${pgdata}"
 }

libs/postgresql/files/postgresql.sh

@@ -0,0 +1,60 @@
+#!/bin/sh
+
+PSQL="/usr/bin/psql"
+
+free_megs() {
+	fsdir=$1
+	while [ ! -d "$fsdir" ]; do
+		fsdir=$(dirname $fsdir)
+	done
+	df -m $fsdir | while read fs bl us av cap mnt; do [ "$av" = "Available" ] || echo $av; done
+}
+
+pg_init_data() {
+	# make sure we got at least 50MB of free space
+	[ $(free_megs $1) -lt 50 ] && return 1
+	pg_ctl initdb -U postgres -D $1
+}
+
+pg_server_ready() {
+	t=0
+	while [ $t -le 90 ]; do
+		pg_ctl status -U postgres -D $1 2>/dev/null >/dev/null && return 0
+		t=$((t+1))
+		sleep 1
+	done
+	return 1
+}
+
+# $1: dbname, $2: username, $3: password
+pg_require_db() {
+	pg_test_db $@ && return 0
+	( echo "CREATE DATABASE $1;"
+	echo -n "CREATE USER $2"
+	[ "$3" ] && echo -n " WITH PASSWORD '$3'"
+	echo ";"
+	echo "GRANT ALL PRIVILEGES ON DATABASE \"$1\" to $2;" ) |
+		$PSQL -U postgres -d template1 -e
+	return $?
+}
+
+pg_test_db() {
+	PGPASSWORD=$3
+	echo "SHOW ALL;" | $PSQL -U $2 -d $1 -q 2>/dev/null >/dev/null
+	return $?
+}
+
+uci_require_db() {
+	local dbname dbuser dbpass
+	config_get dbname $1 name
+	config_get dbuser $1 user
+	config_get dbpass $1 pass
+	pg_require_db $dbname $dbuser $dbpass
+}
+
+[ "$1" = "init" ] && {
+	. /lib/functions.sh
+	pg_server_ready $2 || exit 1
+	config_load postgresql
+	config_foreach uci_require_db postgres-db
+}