From 493c9a35516c27a8ec412d97e63c8cf6f41a57ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
Date: Fri, 23 Nov 2018 10:53:37 +0100
Subject: [PATCH] build: Introduce building of artifacts
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

We currently could (ab)use IMAGES for this task, but the downside is,
that the filenames has filesystem tied to the filename, which might be
confusing as the artifact itself don't has to be used with that specific
filesystem. Another downside is, that the artifacts built with IMAGES
target are build for every FILESYSTEMS filesystem.

Consider following use case:

 define Device/apalis
   ...
   FILESYSTEMS := ext4 squashfs
   IMAGES := spl-uboot.bin recovery.scr
   IMAGE/spl-uboot.bin := append-uboot-spl | pad-to 68k | append-uboot
   IMAGE/recovery.scr := recovery-scr
 endef

Where we would get target binaries with following filenames:

 openwrt-imx6-apalis-squashfs.recovery.scr
 openwrt-imx6-apalis-squashfs.spl-uboot.bin
 openwrt-imx6-apalis-ext4.recovery.scr
 openwrt-imx6-apalis-ext4.spl-uboot.bin

With proposed patch, we could now just do:

 define Device/apalis
   ...
   ARTIFACTS := spl-uboot.bin recovery.scr
   ARTIFACT/spl-uboot.bin := append-uboot-spl | pad-to 68k | append-uboot
   ARTIFACT/recovery.scr := recovery-scr
 endef

Which would produce target binaries with following filenames:

 openwrt-imx6-apalis-recovery.scr
 openwrt-imx6-apalis-spl-uboot.bin

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 include/image.mk | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/image.mk b/include/image.mk
index f2a85f6feb..a2b106d909 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -321,6 +321,7 @@ define Device/Init
   CMDLINE:=
 
   IMAGES :=
+  ARTIFACTS :=
   IMAGE_PREFIX := $(IMG_PREFIX)-$(1)
   IMAGE_NAME = $$(IMAGE_PREFIX)-$$(1)-$$(2)
   KERNEL_PREFIX = $$(IMAGE_PREFIX)
@@ -498,6 +499,19 @@ define Device/Build/image
 
 endef
 
+define Device/Build/artifact
+  $$(_TARGET): $(BIN_DIR)/$(IMAGE_PREFIX)-$(1)
+  $(KDIR)/tmp/$(IMAGE_PREFIX)-$(1): $$(KDIR_KERNEL_IMAGE)
+	@rm -f $$@
+	$$(call concat_cmd,$(ARTIFACT/$(1)))
+
+  .IGNORE: $(BIN_DIR)/$(IMAGE_PREFIX)-$(1)
+
+  $(BIN_DIR)/$(IMAGE_PREFIX)-$(1): $(KDIR)/tmp/$(IMAGE_PREFIX)-$(1)
+	cp $$^ $$@
+
+endef
+
 define Device/Build
   $(if $(CONFIG_TARGET_ROOTFS_INITRAMFS),$(call Device/Build/initramfs,$(1)))
   $(call Device/Build/kernel,$(1))
@@ -508,6 +522,10 @@ define Device/Build
   $$(eval $$(foreach image,$$(IMAGES), \
     $$(foreach fs,$$(filter $(TARGET_FILESYSTEMS),$$(FILESYSTEMS)), \
       $$(call Device/Build/image,$$(fs),$$(image),$(1)))))
+
+  $$(eval $$(foreach artifact,$$(ARTIFACTS), \
+    $$(call Device/Build/artifact,$$(artifact))))
+
 endef
 
 define Device/DumpInfo