Make config file location configurable

CMakeLists.txt

 option(USE_APPARMOR "Enable AppArmor profile" OFF)
 
 set(CHROOT_DIR "${CMAKE_INSTALL_PREFIX}/lib/${PROJECT_NAME}" CACHE PATH "Chroot jail for daemon")
+set(CONFIG_DIR "/etc/default" CACHE PATH "Location of configuration file")
 
 find_program(HELP2MAN help2man DOC "path to help2man executable")
 find_program(DD dd DOC "path to dd executable")

postinstall.cmake.in

 set(GENERATE_SRS_SECRET "@GENERATE_SRS_SECRET@")
 set(CHROOT_DIR "@CHROOT_DIR@")
+set(CONFIG_DIR "@CONFIG_DIR@")
 set(INIT_FLAVOR "@INIT_FLAVOR@")
 set(SECRET_FILE "@PROJECT_NAME@.secret")
 set(DD "@DD@")
 	file(MAKE_DIRECTORY "$ENV{DESTDIR}${CHROOT_DIR}")
 endif()
 
-if(INIT_FLAVOR AND NOT EXISTS "$ENV{DESTDIR}/etc/default/@PROJECT_NAME@")
-	file(INSTALL FILES "@CMAKE_CURRENT_SOURCE_DIR@/@PROJECT_NAME@.default" DESTINATION "/etc/default" RENAME "@PROJECT_NAME@")
+if(INIT_FLAVOR AND NOT EXISTS "$ENV{DESTDIR}${CONFIG_DIR}/@PROJECT_NAME@")
+	file(INSTALL FILES "@CMAKE_CURRENT_SOURCE_DIR@/@PROJECT_NAME@.default" DESTINATION "${CONFIG_DIR}" RENAME "@PROJECT_NAME@")
 endif()
 
 if(INIT_FLAVOR STREQUAL "sysv-lsb")

postsrsd.lsb_init.in

 CHROOT=@CHROOT_DIR@
 
 # Read config file if it is present.
-if [ -r /etc/default/$NAME ]
+if [ -r @CONFIG_DIR@/$NAME ]
 then
-    . /etc/default/$NAME
+    . @CONFIG_DIR@/$NAME
 fi
 
 test -r "$SRS_SECRET" -a -n "$SRS_DOMAIN" || exit 0

postsrsd.rh_init.in

 # description: Sender Rewriting Scheme (SRS) for Postfix.
 # processname: @POSTSRSD@
 # pidfile: /var/run/@PROJECT_NAME@.pid
-# config: /etc/default/@PROJECT_NAME@
+# config: @CONFIG_DIR@/@PROJECT_NAME@
 
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 DAEMON=@CMAKE_INSTALL_PREFIX@/sbin/@POSTSRSD@
 CHROOT=@CHROOT_DIR@
 
 # Read config file if it is present.
-if [ -r /etc/default/$NAME ]
+if [ -r @CONFIG_DIR@/$NAME ]
 then
-    . /etc/default/$NAME
+    . @CONFIG_DIR@/$NAME
 fi
 
 test -r "$SRS_SECRET" -a -n "$SRS_DOMAIN" || exit 0

postsrsd.upstart.in

 stop on runlevel [!2345]
 respawn
 
-env DEFAULTFILE=/etc/default/@PROJECT_NAME@
+env DEFAULTFILE=@CONFIG_DIR@/@PROJECT_NAME@
 
 script
 	SRS_DOMAIN=`postconf -h mydomain || true`