shadow: add usercache-setup and usercache service

packages/sysutils/systemd/package.mk

@@ -202,6 +202,7 @@ post_makeinstall_target() {
   mkdir -p $INSTALL/usr/bin
   cp $PKG_DIR/scripts/systemd-machine-id-setup $INSTALL/usr/bin
   cp $PKG_DIR/scripts/userconfig-setup $INSTALL/usr/bin
+  cp $PKG_DIR/scripts/usercache-setup $INSTALL/usr/bin
 
   mkdir -p $INSTALL/usr/sbin
   cp $PKG_DIR/scripts/kernel-overlays-setup $INSTALL/usr/sbin
@@ -255,6 +256,7 @@ post_install() {
   enable_service machine-id.service
   enable_service debugconfig.service
   enable_service userconfig.service
+  enable_service usercache.service
   enable_service kernel-overlays.service
   enable_service hwdb.service
 }

packages/sysutils/systemd/scripts/usercache-setup

@@ -0,0 +1,33 @@
+#!/bin/sh
+################################################################################
+#      This file is part of LibreELEC - https://libreelec.tv
+#      Copyright (C) 2017-present Team LibreELEC
+#
+#  LibreELEC 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.
+#
+#  LibreELEC 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 LibreELEC.  If not, see <http://www.gnu.org/licenses/>.
+################################################################################
+
+# Copy cache files, but don't overwrite
+false | cp -iRp /usr/cache/* /storage/.cache/ &>/dev/null
+
+# Merge default and custom shadow file details
+if [ -f /storage/.cache/shadow -a -f /usr/cache/shadow ]; then
+  # Get existing root details (possibly user defined)
+  userroot="$(grep "^root:" /storage/.cache/shadow)"
+
+  # Overwrite users shadow file with default details, but replacing root with any existing value
+  [ -n "${userroot}" ] && sed -e "s ^root:.* ${userroot} " /usr/cache/shadow >/storage/.cache/shadow
+
+  # Make sure we have the correct permission
+  chmod 000 /storage/.cache/shadow
+fi

packages/sysutils/systemd/system.d/usercache.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Setup User cache dir
+DefaultDependencies=no
+After=systemd-tmpfiles-setup.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/usercache-setup
+RemainAfterExit=yes
+
+[Install]
+WantedBy=sysinit.target