package/pkg-generic.mk: add <pkg>_INSTALL_INIT_OPENRC

* package/pkg-generic.mk
  Add <pkg>_INSTALL_INIT_OPENRC so packages can define their own steps
  to install openrc service scripts.

* docs/manual/adding-packages-generic.txt
  update documentation about new hook.

Signed-off-by: Michał Łyszczek <michal.lyszczek@bofc.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

docs/manual/adding-packages-generic.txt

@@ -536,12 +536,13 @@ different steps of the build process.
   should utilize this step if it has binaries which would be similar
   to the kernel image, bootloader or root filesystem images.
 
-* +LIBFOO_INSTALL_INIT_SYSV+ and +LIBFOO_INSTALL_INIT_SYSTEMD+ list the
-  actions to install init scripts either for the systemV-like init systems
-  (busybox, sysvinit, etc.) or for the systemd units. These commands
-  will be run only when the relevant init system is installed (i.e. if
-  systemd is selected as the init system in the configuration, only
-  +LIBFOO_INSTALL_INIT_SYSTEMD+ will be run).
+* +LIBFOO_INSTALL_INIT_SYSV+, +LIBFOO_INSTALL_INIT_OPENRC+ and
+  +LIBFOO_INSTALL_INIT_SYSTEMD+ list the actions to install init
+  scripts either for the systemV-like init systems (busybox,
+  sysvinit, etc.), openrc or for the systemd units. These commands
+  will be run only when the relevant init system is installed (i.e.
+  if systemd is selected as the init system in the configuration,
+  only +LIBFOO_INSTALL_INIT_SYSTEMD+ will be run).
 
 * +LIBFOO_HELP_CMDS+ lists the actions to print the package help, which
   is included to the main +make help+ output. These commands can print

package/pkg-generic.mk

@@ -337,6 +337,8 @@ $(BUILD_DIR)/%/.stamp_target_installed:
 		$($(PKG)_INSTALL_INIT_SYSTEMD))
 	$(if $(BR2_INIT_SYSV)$(BR2_INIT_BUSYBOX),\
 		$($(PKG)_INSTALL_INIT_SYSV))
+	$(if $(BR2_INIT_OPENRC), \
+		$($(PKG)_INSTALL_INIT_OPENRC))
 	$(foreach hook,$($(PKG)_POST_INSTALL_TARGET_HOOKS),$(call $(hook))$(sep))
 	$(Q)if test -n "$($(PKG)_CONFIG_SCRIPTS)" ; then \
 		$(RM) -f $(addprefix $(TARGET_DIR)/usr/bin/,$($(PKG)_CONFIG_SCRIPTS)) ; \