[openwrt/openwrt] image: introduce 'append-image-stage' build command

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/de4b29dab987c5c1288558c3ca7e1edcd95920e0

commit de4b29dab987c5c1288558c3ca7e1edcd95920e0
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Fri Apr 23 23:05:54 2021 +0100

    image: introduce 'append-image-stage' build command
    
    Similar to 'append-image' this new command appends an existing binary.
    'append-image-stage' also makes a copy of that binary and keeps it in
    $(STAGING_DIR_IMAGE). When called from within the ImageBuilder, this
    copy is used instead of expecting the binary to be present.
    This is useful for artifacts which include the initramfs/recovery image
    which is usually not included in the ImageBuilder.
    
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 include/image-commands.mk | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 2c56ed8d1d..4c9075c35b 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -31,6 +31,18 @@ define Build/append-image
 	dd if=$(BIN_DIR)/$(DEVICE_IMG_PREFIX)-$(1) >> $@
 endef
 
+ifdef IB
+define Build/append-image-stage
+	dd if=$(STAGING_DIR_IMAGE)/$(DEVICE_IMG_PREFIX)-$(1) >> $@
+endef
+else
+define Build/append-image-stage
+	dd if=$(BIN_DIR)/$(DEVICE_IMG_PREFIX)-$(1) of=$(STAGING_DIR_IMAGE)/$(DEVICE_IMG_PREFIX)-$(1)
+	dd if=$(BIN_DIR)/$(DEVICE_IMG_PREFIX)-$(1) >> $@
+endef
+endif
+
+
 compat_version=$(if $(DEVICE_COMPAT_VERSION),$(DEVICE_COMPAT_VERSION),1.0)
 json_quote=$(subst ','\'',$(subst ",\",$(1)))
 #")')