image.mk: add generic function for gzipping images if enabled

[openwrt/openwrt.git] / include / image.mk

diff --git a/include/image.mk b/include/image.mk
index ab5b816844e7cabe2271d3bcd5707224a0534271..81519cd1834907c83f19e123aa0282768c91dd84 100644 (file)
--- a/include/image.mk
+++ b/include/image.mk
@@ -147,6 +147,13 @@ define Image/BuildKernel/MkFIT
        PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $(KDIR)/fit-$(1).its $(KDIR)/fit-$(1)$(7).itb
 endef
 
+ifdef CONFIG_TARGET_IMAGES_GZIP
+  define Image/Gzip
+       rm -f $(1).gz
+       gzip -9n $(1)
+  endef
+endif
+
 # $(1) source dts file
 # $(2) target dtb file
 # $(3) extra CPP flags
@@ -445,7 +452,8 @@ define Device/Build/kernel
 endef
 
 define Device/Build/image
-  $$(_TARGET): $(BIN_DIR)/$(call IMAGE_NAME,$(1),$(2))
+  GZ_SUFFIX := $(if $(filter %dtb %gz,$(2)),,$(if $(and $(findstring ext4,$(1)),$(CONFIG_TARGET_IMAGES_GZIP)),.gz))
+  $$(_TARGET): $(BIN_DIR)/$(call IMAGE_NAME,$(1),$(2))$$(GZ_SUFFIX)
   $(eval $(call Device/Export,$(KDIR)/tmp/$(call IMAGE_NAME,$(1),$(2)),$(1)))
   ROOTFS/$(1)/$(3) := \
        $(KDIR)/root.$(1)$$(strip \
@@ -462,6 +470,10 @@ define Device/Build/image
        $$(call concat_cmd,$(if $(IMAGE/$(2)/$(1)),$(IMAGE/$(2)/$(1)),$(IMAGE/$(2))))
 
   .IGNORE: $(BIN_DIR)/$(call IMAGE_NAME,$(1),$(2))
+
+  $(BIN_DIR)/$(call IMAGE_NAME,$(1),$(2)).gz: $(KDIR)/tmp/$(call IMAGE_NAME,$(1),$(2))
+       gzip -c -9n $$^ > $$@
+
   $(BIN_DIR)/$(call IMAGE_NAME,$(1),$(2)): $(KDIR)/tmp/$(call IMAGE_NAME,$(1),$(2))
        cp $$^ $$@