| # 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)) \ |
| $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ |
| $(if $(filter-out "",$(CONFIG_INITRAMFS_FILE_METADATA)), \ |
| -e $(CONFIG_INITRAMFS_FILE_METADATA)) $(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 |