[Buildroot] [PATCH 4/8] package/mender: add BR2_PACKAGE_MENDER_ARTIFACT_NAME option

[Mirza Krak]

ARTIFACT_NAME is used to set a unique string of the built artifact/image
and this will be reported to the Mender managment server as "current
software running".

The Mender managment server will skip updating device if the
ARTIFACT_NAME is the same on the target device as in the Mender artifact
and hence this name must be unique for every release.

Signed-off-by: Mirza Krak <mirza.krak at northern.tech>
---
 package/mender/Config.in | 13 +++++++++++++
 package/mender/mender.mk |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/package/mender/Config.in b/package/mender/Config.in
index 8c2838c64a..036b7cf798 100644
--- a/package/mender/Config.in
+++ b/package/mender/Config.in
@@ -13,6 +13,19 @@ config BR2_PACKAGE_MENDER
 
 	  https://github.com/mendersoftware/mender
 
+if BR2_PACKAGE_MENDER
+
+config BR2_PACKAGE_MENDER_ARTIFACT_NAME
+	string "Mender artifact name"
+	help
+	  The name of the image or update that will be built. This is what the
+	  device will report that it is running, and different updates must have
+	  different names.
+
+	  Will be stored in /etc/mender/artifact_info
+
+endif
+
 comment "mender needs a toolchain w/ threads"
 	depends on BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS
 	depends on BR2_PACKAGE_HOST_GO_CGO_LINKING_SUPPORTS
diff --git a/package/mender/mender.mk b/package/mender/mender.mk
index b2df70256a..08bdd4bd78 100644
--- a/package/mender/mender.mk
+++ b/package/mender/mender.mk
@@ -9,6 +9,10 @@ MENDER_SITE = $(call github,mendersoftware,mender,$(MENDER_VERSION))
 MENDER_LICENSE = Apache-2.0 & BSD-2-Clause & BSD-3-Clause & MIT & OLDAP-2.8
 MENDER_LICENSE_FILES = LICENSE LIC_FILES_CHKSUM.sha256
 
+ifeq ($(call qstrip,$(BR2_PACKAGE_MENDER_ARTIFACT_NAME)),)
+$(error Mender device type not set. Check your BR2_PACKAGE_MENDER_ARTIFACT_NAME setting)
+endif
+
 define MENDER_INSTALL_CONFIG_FILES
 	$(INSTALL) -d -m 755 $(TARGET_DIR)/data/mender
 	$(INSTALL) -d -m 755 $(TARGET_DIR)/data/uboot
@@ -28,6 +32,9 @@ define MENDER_INSTALL_CONFIG_FILES
 		$(TARGET_DIR)/usr/share/mender/inventory
 
 	ln -sf /data/mender $(TARGET_DIR)/var/lib/mender
+
+	echo "artifact_name=$(call qstrip,$(BR2_PACKAGE_MENDER_ARTIFACT_NAME))" > \
+		$(TARGET_DIR)/etc/mender/artifact_info
 endef
 
 MENDER_POST_INSTALL_TARGET_HOOKS += MENDER_INSTALL_CONFIG_FILES
-- 
2.18.0