[Buildroot] [PATCH 4/4] package/mender: add support for update modules

[aduskett at gmail.com <aduskett@gmail.com>]

From: Adam Duskett <Aduskett@gmail.com>

Mender has support for performing other types of updates other than just
overwriting the rootfs partition that isn't currently in use on the target.

Some of the default provided modules provide support for:
  - Updating a docker container.
  - Running a script.
  - Installing an RPM.
  - Overwriting a directory.
  - Updating a single-file.

The single-file update module is used by upstream for onboarding a new device
to a server, and this fails with Buildroot devices because the modules are
currently not installed.

Install the directory, script, and single-file modules by default, and
install the docker or rpm script if their respective packages are selected.

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
---
 package/mender/mender.mk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/package/mender/mender.mk b/package/mender/mender.mk
index 2faf3fe980..7d3fe877ce 100644
--- a/package/mender/mender.mk
+++ b/package/mender/mender.mk
@@ -37,6 +37,9 @@ MENDER_DEPENDENCIES = xz
 
 MENDER_LDFLAGS = -X main.Version=$(MENDER_VERSION)
 
+MENDER_UPDATE_MODULES_FILES = directory script single-file
+MENDER_UPDATE_MODULES_FILES += $(if $(BR2_PACKAGE_DOCKER_CLI),docker)
+MENDER_UPDATE_MODULES_FILES +=  $(if $(BR2_PACKAGE_RPM),rpm)
 define MENDER_INSTALL_CONFIG_FILES
 	$(INSTALL) -d -m 755 $(TARGET_DIR)/etc/mender/scripts
 	echo -n "3" > $(TARGET_DIR)/etc/mender/scripts/version
@@ -61,6 +64,10 @@ define MENDER_INSTALL_CONFIG_FILES
 
 	mkdir -p $(TARGET_DIR)/var/lib
 	ln -snf /var/run/mender $(TARGET_DIR)/var/lib/mender
+	$(foreach f,$(MENDER_UPDATE_MODULES_FILES), \
+		$(INSTALL) -D -m 0755 $(@D)/support/modules/$(notdir $(f)) \
+			$(TARGET_DIR)/usr/share/mender/modules/v3/$(notdir $(f))
+	)
 endef
 
 MENDER_POST_INSTALL_TARGET_HOOKS += MENDER_INSTALL_CONFIG_FILES
-- 
2.26.2