build: add support code for appending metadata to images
Signed-off-by: Felix Fietkau <nbd@nbd.name>
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		@@ -172,3 +172,21 @@ define Build/sysupgrade-tar
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		--rootfs $(call param_get_default,rootfs,$(1),$(IMAGE_ROOTFS)) \
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		$@
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endef
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json_quote=$(subst ','\'',$(subst ",\",$(1)))
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#")')
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metadata_devices=$(if $(1),$(subst "$(space)","$(comma)",$(strip $(foreach v,$(1),"$(call json_quote,$(v))"))))
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metadata_json = \
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	'{ $(if $(IMAGE_METADATA),$(IMAGE_METADATA)$(comma)) \
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		"supported_devices":[$(call metadata_devices,$(1))], \
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		"version": { \
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			"dist": "$(call json_quote,$(VERSION_DIST))", \
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			"version": "$(call json_quote,$(VERSION_NUMBER))", \
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			"revision": "$(call json_quote,$(REVISION))", \
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			"board": "$(call json_quote,$(BOARD))" \
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		} \
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	}'
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define Build/append-metadata
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	$(if $(SUPPORTED_DEVICES),echo $(call metadata_json,$(SUPPORTED_DEVICES)) | fwtool -I - $@)
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endef
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