1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889 |
- # SPDX-License-Identifier: GPL-2.0
- #
- # kbuild file for usr/ - including initramfs image
- #
- # cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the
- # size at the end of the compressed file, which unfortunately does not work
- # with unpack_to_rootfs(). Make size_append no-op.
- override size_append := :
- compress-y := shipped
- compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
- compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
- compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
- compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
- compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
- compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
- compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
- obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
- $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
- ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
- cpio-data :=
- # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
- # default contents.
- ifeq ($(ramfs-input),)
- ramfs-input := $(srctree)/$(src)/default_cpio_list
- endif
- ifeq ($(words $(ramfs-input)),1)
- # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
- # .cpio, use it directly as an initramfs.
- ifneq ($(filter %.cpio,$(ramfs-input)),)
- cpio-data := $(ramfs-input)
- endif
- # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
- # .cpio.*, use it directly as an initramfs, and avoid double compression.
- ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
- cpio-data := $(ramfs-input)
- compress-y := shipped
- endif
- endif
- # For other cases, generate the initramfs cpio archive based on the contents
- # specified by CONFIG_INITRAMFS_SOURCE.
- ifeq ($(cpio-data),)
- cpio-data := $(obj)/initramfs_data.cpio
- hostprogs := gen_init_cpio
- # .initramfs_data.cpio.d is used to identify all files included
- # 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
- -include $(obj)/.initramfs_data.cpio.d
- # do not try to update files included in initramfs
- $(deps_initramfs): ;
- quiet_cmd_initfs = GEN $@
- cmd_initfs = \
- $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
- $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
- $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
- $(ramfs-input)
- # We rebuild initramfs_data.cpio if:
- # 1) Any included file is newer than initramfs_data.cpio
- # 2) There are changes in which files are included (added or deleted)
- # 3) If gen_init_cpio are newer than initramfs_data.cpio
- # 4) Arguments to gen_initramfs.sh changes
- $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
- $(call if_changed,initfs)
- endif
- $(obj)/initramfs_inc_data: $(cpio-data) FORCE
- $(call if_changed,$(compress-y))
- targets += initramfs_data.cpio initramfs_inc_data
- subdir-$(CONFIG_UAPI_HEADER_TEST) += include
|