usr/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # kbuild file for usr/ - including initramfs image
   4 #
   5
   6 # cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the
   7 # size at the end of the compressed file, which unfortunately does not work
   8 # with unpack_to_rootfs(). Make size_append no-op.
   9 override size_append := :
  10
  11 compress-y                                      := shipped
  12 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP)   := gzip
  13 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)  := bzip2
  14 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA)   := lzma
  15 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ)     := xzmisc
  16 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO)    := lzo
  17 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4)    := lz4
  18 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD)   := zstd
  19
  20 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  21
  22 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
  23
  24 ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
  25 cpio-data :=
  26
  27 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
  28 # default contents.
  29 ifeq ($(ramfs-input),)
  30 ramfs-input := $(srctree)/$(src)/default_cpio_list
  31 endif
  32
  33 ifeq ($(words $(ramfs-input)),1)
  34
  35 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
  36 # .cpio, use it directly as an initramfs.
  37 ifneq ($(filter %.cpio,$(ramfs-input)),)
  38 cpio-data := $(ramfs-input)
  39 endif
  40
  41 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
  42 # .cpio.*, use it directly as an initramfs, and avoid double compression.
  43 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
  44 cpio-data := $(ramfs-input)
  45 compress-y := shipped
  46 endif
  47
  48 endif
  49
  50 # For other cases, generate the initramfs cpio archive based on the contents
  51 # specified by CONFIG_INITRAMFS_SOURCE.
  52 ifeq ($(cpio-data),)
  53
  54 cpio-data := $(obj)/initramfs_data.cpio
  55
  56 hostprogs := gen_init_cpio
  57
  58 # .initramfs_data.cpio.d is used to identify all files included
  59 # in initramfs and to detect if any files are added/removed.
  60 # Removed files are identified by directory timestamp being updated
  61 # The dependency list is generated by gen_initramfs.sh -l
  62 -include $(obj)/.initramfs_data.cpio.d
  63
  64 # do not try to update files included in initramfs
  65 $(deps_initramfs): ;
  66
  67 quiet_cmd_initfs = GEN     $@
  68       cmd_initfs = \
  69         $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
  70         $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  71         $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
  72         $(ramfs-input)
  73
  74 # We rebuild initramfs_data.cpio if:
  75 # 1) Any included file is newer than initramfs_data.cpio
  76 # 2) There are changes in which files are included (added or deleted)
  77 # 3) If gen_init_cpio are newer than initramfs_data.cpio
  78 # 4) Arguments to gen_initramfs.sh changes
  79 $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
  80         $(call if_changed,initfs)
  81
  82 endif
  83
  84 $(obj)/initramfs_inc_data: $(cpio-data) FORCE
  85         $(call if_changed,$(compress-y))
  86
  87 targets += initramfs_data.cpio initramfs_inc_data
  88
  89 subdir-$(CONFIG_UAPI_HEADER_TEST) += include