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
  19 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  20
  21 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
  22
  23 ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
  24 cpio-data :=
  25
  26 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
  27 # default contents.
  28 ifeq ($(ramfs-input),)
  29 ramfs-input := $(srctree)/$(src)/default_cpio_list
  30 endif
  31
  32 ifeq ($(words $(ramfs-input)),1)
  33
  34 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
  35 # .cpio, use it directly as an initramfs.
  36 ifneq ($(filter %.cpio,$(ramfs-input)),)
  37 cpio-data := $(ramfs-input)
  38 endif
  39
  40 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
  41 # .cpio.*, use it directly as an initramfs, and avoid double compression.
  42 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
  43 cpio-data := $(ramfs-input)
  44 compress-y := shipped
  45 endif
  46
  47 endif
  48
  49 # For other cases, generate the initramfs cpio archive based on the contents
  50 # specified by CONFIG_INITRAMFS_SOURCE.
  51 ifeq ($(cpio-data),)
  52
  53 cpio-data := $(obj)/initramfs_data.cpio
  54
  55 hostprogs := gen_init_cpio
  56
  57 # .initramfs_data.cpio.d is used to identify all files included
  58 # in initramfs and to detect if any files are added/removed.
  59 # Removed files are identified by directory timestamp being updated
  60 # The dependency list is generated by gen_initramfs.sh -l
  61 -include $(obj)/.initramfs_data.cpio.d
  62
  63 # do not try to update files included in initramfs
  64 $(deps_initramfs): ;
  65
  66 quiet_cmd_initfs = GEN     $@
  67       cmd_initfs = \
  68         $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
  69         $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  70         $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
  71         $(ramfs-input)
  72
  73 # We rebuild initramfs_data.cpio if:
  74 # 1) Any included file is newer than initramfs_data.cpio
  75 # 2) There are changes in which files are included (added or deleted)
  76 # 3) If gen_init_cpio are newer than initramfs_data.cpio
  77 # 4) Arguments to gen_initramfs.sh changes
  78 $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
  79         $(call if_changed,initfs)
  80
  81 endif
  82
  83 $(obj)/initramfs_inc_data: $(cpio-data) FORCE
  84         $(call if_changed,$(compress-y))
  85
  86 targets += initramfs_data.cpio initramfs_inc_data
  87
  88 subdir-$(CONFIG_UAPI_HEADER_TEST) += include