Merge pull request #4731 from chewitt/entropy_backport

entropy: backport to 6.0 branch

config/functions

@@ -224,11 +224,13 @@ enable_service () {
   local target_dir=$INSTALL
 
   [ -f "$target_dir/$unit_dir/$unit" ] || exit 1
-  [ -z "$target" ] && target=`grep '^WantedBy' $target_dir/$unit_dir/$unit | cut -f2 -d=`
-
-  if [ -n "$target" ]; then
-    mkdir -p ${target_dir}/$unit_dir/${target}.wants
-    ln -sf ../${unit} ${target_dir}/$unit_dir/${target}.wants/
+  if [ -z "$target" ] ; then
+    for target in `grep '^WantedBy' $target_dir/$unit_dir/$unit | cut -f2 -d=` ; do
+      if [ -n "$target" ]; then
+        mkdir -p ${target_dir}/$unit_dir/${target}.wants
+        ln -sf ../${unit} ${target_dir}/$unit_dir/${target}.wants/
+      fi
+    done
   fi
 }
 

packages/sysutils/entropy/package.mk

@@ -0,0 +1,50 @@
+################################################################################
+#      This file is part of OpenELEC - http://www.openelec.tv
+#      Copyright (C) 2009-2016 Stephan Raue (stephan@openelec.tv)
+#
+#  OpenELEC is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  OpenELEC is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with OpenELEC.  If not, see <http://www.gnu.org/licenses/>.
+################################################################################
+
+PKG_NAME="entropy"
+PKG_VERSION="0"
+PKG_REV="1"
+PKG_ARCH="any"
+PKG_LICENSE="GPL"
+PKG_SITE=""
+PKG_URL=""
+PKG_DEPENDS_TARGET="toolchain"
+PKG_PRIORITY="optional"
+PKG_SECTION="system"
+PKG_SHORTDESC="A simple way to add entropy at boot"
+PKG_LONGDESC="A simple way to add entropy at boot"
+
+PKG_IS_ADDON="no"
+PKG_AUTORECONF="no"
+
+make_target(){
+  :
+}
+
+makeinstall_target() {
+  mkdir -p $INSTALL/usr/lib/entropy
+    cp add-entropy $INSTALL/usr/lib/entropy
+    cp add-random-at-shutdown $INSTALL/usr/lib/entropy
+
+  chmod +x $INSTALL/usr/lib/entropy/*
+}
+
+post_install() {
+  enable_service add-entropy.service
+  enable_service add-random-at-shutdown.service
+}

packages/sysutils/entropy/sources/add-entropy

@@ -0,0 +1,24 @@
+#!/usr/bin/python
+
+import os
+import struct
+
+RNDADDENTROPY = 0x40085203
+import fcntl
+
+def add_entropy(fd, data):
+    add = struct.pack('ii', len(data)*8, len(data)) + data
+    fcntl.ioctl(fd, RNDADDENTROPY, add)
+
+if not os.path.isfile("/storage/.cache/random.data"):
+    os.system("dd if=/dev/urandom of=/storage/.cache/random.data count=4 >/dev/null")
+
+cache=os.open("/storage/.cache/random.data", os.O_RDONLY)
+
+rnd=os.open("/dev/random", os.O_RDWR)
+
+while True:
+    data=os.read(cache, 512)
+    if len(data) == 0:
+        break
+    add_entropy(rnd, data)

packages/sysutils/entropy/sources/add-random-at-shutdown

@@ -0,0 +1,2 @@
+#!/bin/sh
+dd if=/dev/urandom of=/storage/.cache/random.data count=4

packages/sysutils/entropy/system.d/add-entropy.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Add random entropy from file
+DefaultDependencies=no
+After=systemd-tmpfiles-setup.service
+Before=systemd-udevd.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/entropy/add-entropy
+RemainAfterExit=yes
+
+[Install]
+WantedBy=basic.target

packages/sysutils/entropy/system.d/add-random-at-shutdown.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Save random entropy at shutdown
+DefaultDependencies=no
+Before=systemd-poweroff.service systemd-reboot.service systemd-halt.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/entropy/add-random-at-shutdown
+RemainAfterExit=yes
+
+[Install]
+WantedBy=poweroff.target reboot.target halt.target

packages/sysutils/systemd/package.mk

@@ -23,7 +23,7 @@ PKG_ARCH="any"
 PKG_LICENSE="GPL"
 PKG_SITE="http://www.freedesktop.org/wiki/Software/systemd"
 PKG_URL="http://www.freedesktop.org/software/systemd/$PKG_NAME-$PKG_VERSION.tar.xz"
-PKG_DEPENDS_TARGET="toolchain libcap kmod util-linux"
+PKG_DEPENDS_TARGET="toolchain libcap kmod util-linux entropy"
 PKG_PRIORITY="required"
 PKG_SECTION="system"
 PKG_SHORTDESC="systemd: a system and session manager"