add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/usr/Makefile
..
..
@@ -3,59 +3,87 @@
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 # kbuild file for usr/ - including initramfs image
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 #
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-klibcdirs:;
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-PHONY += klibcdirs
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+# cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the
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+# size at the end of the compressed file, which unfortunately does not work
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+# with unpack_to_rootfs(). Make size_append no-op.
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+override size_append := :
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-suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
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-datafile_y = initramfs_data.cpio$(suffix_y)
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-datafile_d_y = .$(datafile_y).d
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-AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
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+compress-y					:= shipped
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP)	:= gzip
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)	:= bzip2
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA)	:= lzma
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ)	:= xzmisc
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO)	:= lzo
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4)	:= lz4
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+compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD)	:= zstd
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-# clean rules do not have CONFIG_INITRAMFS_COMPRESSION.  So clean up after all
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-# possible compression formats.
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-clean-files += initramfs_data.cpio*
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-
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-# Generate builtin.o based on initramfs_data.o
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 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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-# initramfs_data.o contains the compressed initramfs_data.cpio image.
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-# The image is included using .incbin, a dependency which is not
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-# tracked automatically.
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-$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
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+$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
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-#####
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-# Generate the initramfs cpio archive
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+ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
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+cpio-data :=
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-hostprogs-y := gen_init_cpio
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-initramfs   := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh
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-ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
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-			$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
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-ramfs-args  := \
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-        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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-        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
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+# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
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+# default contents.
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+ifeq ($(ramfs-input),)
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+ramfs-input := $(srctree)/$(src)/default_cpio_list
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+endif
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-# $(datafile_d_y) is used to identify all files included
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+ifeq ($(words $(ramfs-input)),1)
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+
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+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
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+# .cpio, use it directly as an initramfs.
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+ifneq ($(filter %.cpio,$(ramfs-input)),)
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+cpio-data := $(ramfs-input)
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+endif
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+
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+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
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+# .cpio.*, use it directly as an initramfs, and avoid double compression.
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+ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
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+cpio-data := $(ramfs-input)
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+compress-y := shipped
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+endif
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+
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+endif
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+
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+# For other cases, generate the initramfs cpio archive based on the contents
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+# specified by CONFIG_INITRAMFS_SOURCE.
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+ifeq ($(cpio-data),)
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+
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+cpio-data := $(obj)/initramfs_data.cpio
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+
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+hostprogs := gen_init_cpio
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+
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+# .initramfs_data.cpio.d is used to identify all files included
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 # in initramfs and to detect if any files are added/removed.
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 # Removed files are identified by directory timestamp being updated
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 # The dependency list is generated by gen_initramfs.sh -l
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-ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
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-	include $(obj)/$(datafile_d_y)
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-endif
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-
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-quiet_cmd_initfs = GEN     $@
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-      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
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-
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-targets := $(datafile_y)
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+-include $(obj)/.initramfs_data.cpio.d
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 # do not try to update files included in initramfs
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 $(deps_initramfs): ;
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-$(deps_initramfs): klibcdirs
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+quiet_cmd_initfs = GEN     $@
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+      cmd_initfs = \
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+	$(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
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+	$(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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+	$(ramfs-input)
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+
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 # We rebuild initramfs_data.cpio if:
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-# 1) Any included file is newer then initramfs_data.cpio
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+# 1) Any included file is newer than initramfs_data.cpio
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 # 2) There are changes in which files are included (added or deleted)
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 # 3) If gen_init_cpio are newer than initramfs_data.cpio
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-# 4) arguments to gen_initramfs.sh changes
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-$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
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-	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y)
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+# 4) Arguments to gen_initramfs.sh changes
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+$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
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 	$(call if_changed,initfs)
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+
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+endif
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+
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+$(obj)/initramfs_inc_data: $(cpio-data) FORCE
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+	$(call if_changed,$(compress-y))
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+
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+targets += initramfs_data.cpio initramfs_inc_data
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+
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+subdir-$(CONFIG_UAPI_HEADER_TEST) += include