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#
# kbuild file for usr/ - including initramfs image
#
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klibcdirs:;
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PHONY += klibcdirs

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suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
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datafile_y = initramfs_data.cpio$(suffix_y)
AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"

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# Generate builtin.o based on initramfs_data.o
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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# initramfs_data.o contains the compressed initramfs_data.cpio image.
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# The image is included using .incbin, a dependency which is not
# tracked automatically.
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$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
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#####
# Generate the initramfs cpio archive

hostprogs-y := gen_init_cpio
initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
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			$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
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ramfs-args  := \
        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
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# .initramfs_data.cpio.d is used to identify all files included
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# in initramfs and to detect if any files are added/removed.
# Removed files are identified by directory timestamp being updated
# The dependency list is generated by gen_initramfs.sh -l
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ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
	include $(obj)/.initramfs_data.cpio.d
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endif

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quiet_cmd_initfs = GEN     $@
      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)

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targets := $(datafile_y)

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# do not try to update files included in initramfs
$(deps_initramfs): ;

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$(deps_initramfs): klibcdirs
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# We rebuild initramfs_data.cpio if:
# 1) Any included file is newer then initramfs_data.cpio
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# 2) There are changes in which files are included (added or deleted)
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# 3) If gen_init_cpio are newer than initramfs_data.cpio
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# 4) arguments to gen_initramfs.sh changes
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$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
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	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
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	$(call if_changed,initfs)