transmission: use procd

That allows to restart transmission when it crashes, to limit
the memory used by it, as well as be jailed in the directories
it is supposed to access.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

net/transmission/files/transmission.init

@@ -1,7 +1,9 @@
 #!/bin/sh /etc/rc.common
-# Copyright (C) 2010-2012 OpenWrt.org
+# Copyright (C) 2010-2015 OpenWrt.org
 
 START=99
+USE_PROCD=1
+
 
 LIST_SEP="
 "
@@ -40,14 +42,23 @@ section_enabled() {
 	[ $enabled -gt 0 ]
 }
 
-start_instance() {
-	local s="$1"
+transmission() {
+	local cfg="$1"
+	#give transmission 3/5 of the memory of the system
+	local USE
+	local MEM=`grep MemTotal /proc/meminfo|sed 's/ \+/ /g'|cut -d ' ' -f 2`
+	if test "$MEM" -gt 1;then
+		USE=`expr $MEM \* 3000 / 5`
+	fi
+
 	local user
+	local download_dir
 
 	section_enabled "$section" || return 1
 
-	config_get config_dir "$s" 'config_dir' '/var/etc/transmission'
-	config_get user "$s" 'user'
+	config_get config_dir "$cfg" 'config_dir' '/var/etc/transmission'
+	config_get user "$cfg" 'user'
+	config_get download_dir "$cfg" 'download_dir' '/var/etc/transmission'
 
 	config_file="$config_dir/settings.json"
 	[ -d $config_dir ] || {
@@ -58,7 +69,7 @@ start_instance() {
 
 	echo "{" > $config_file
 
-	append_params "$s" \
+	append_params "$cfg" \
 		alt_speed_down alt_speed_enabled alt_speed_time_begin alt_speed_time_day \
 		alt_speed_time_enabled alt_speed_time_end alt_speed_up blocklist_enabled \
 		cache_size_mb download_queue_enabled download_queue_size \
@@ -76,7 +87,7 @@ start_instance() {
 		umask upload_slots_per_torrent utp_enabled scrape_paused_torrents \
 		watch_dir_enabled
 
-	append_params_quotes "$s" \
+	append_params_quotes "$cfg" \
 		blocklist_url bind_address_ipv4 bind_address_ipv6 download_dir incomplete_dir \
 		peer_congestion_algorithm peer_socket_tos rpc_bind_address rpc_password rpc_url \
 		rpc_username rpc_whitelist script_torrent_done_filename watch_dir
@@ -84,28 +95,25 @@ start_instance() {
 	echo "\""invalid-key"\": false" >> $config_file
 	echo "}" >> $config_file
 
-	SERVICE_UID="$user" \
-	service_start /usr/bin/transmission-daemon -g $config_dir
+	procd_open_instance
+	procd_set_param command /usr/bin/transmission-daemon -g $config_dir -f
+	procd_set_param respawn
+	procd_set_param user "$user"
+	if test -z "$USE";then
+		procd_set_param limits core="0 0"
+	else
+		procd_set_param limits core="0 0" as="$USE $USE"
+		logger -t transmission "Starting with $USE virt mem"
+	fi
+
+	procd_add_jail transmission log
+	procd_add_jail_mount $config_file
+	procd_add_jail_mount_rw $download_dir
+	procd_close_instance
 }
 
-stop_instance() {
-	local s="$1"
-	local user
-
-	section_enabled "$section" || return 1
-
-	config_get user "$s" 'user'
-
-	SERVICE_UID="$user" \
-	service_stop /usr/bin/transmission-daemon
-}
-
-start() {
+start_service() {
 	config_load 'transmission'
-	config_foreach start_instance 'transmission'
+	config_foreach transmission 'transmission'
 }
 
-stop() {
-	config_load 'transmission'
-	config_foreach stop_instance 'transmission'
-}