1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # kbuild file for usr/ - including initramfs i 3 # kbuild file for usr/ - including initramfs image
4 # 4 #
5 5
6 compress-y !! 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
7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) 12 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
8 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) 13 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
9 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) 14 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
10 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) 15 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
11 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) 16 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
12 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) 17 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
13 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) <<
14 18
15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data 19 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
16 20
17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_ 21 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
18 22
19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE) !! 23 ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
20 cpio-data := 24 cpio-data :=
21 25
22 # If CONFIG_INITRAMFS_SOURCE is empty, generat 26 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
23 # default contents. 27 # default contents.
24 ifeq ($(ramfs-input),) 28 ifeq ($(ramfs-input),)
25 ramfs-input := $(src)/default_cpio_list !! 29 ramfs-input := $(srctree)/$(src)/default_cpio_list
26 endif 30 endif
27 31
28 ifeq ($(words $(ramfs-input)),1) 32 ifeq ($(words $(ramfs-input)),1)
29 33
30 # If CONFIG_INITRAMFS_SOURCE specifies a singl 34 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
31 # .cpio, use it directly as an initramfs. 35 # .cpio, use it directly as an initramfs.
32 ifneq ($(filter %.cpio,$(ramfs-input)),) 36 ifneq ($(filter %.cpio,$(ramfs-input)),)
33 cpio-data := $(ramfs-input) 37 cpio-data := $(ramfs-input)
34 endif 38 endif
35 39
36 # If CONFIG_INITRAMFS_SOURCE specifies a singl 40 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
37 # .cpio.*, use it directly as an initramfs, an 41 # .cpio.*, use it directly as an initramfs, and avoid double compression.
38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs- 42 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
39 cpio-data := $(ramfs-input) 43 cpio-data := $(ramfs-input)
40 compress-y := copy !! 44 compress-y := shipped
41 endif 45 endif
42 46
43 endif 47 endif
44 48
45 # For other cases, generate the initramfs cpio 49 # For other cases, generate the initramfs cpio archive based on the contents
46 # specified by CONFIG_INITRAMFS_SOURCE. 50 # specified by CONFIG_INITRAMFS_SOURCE.
47 ifeq ($(cpio-data),) 51 ifeq ($(cpio-data),)
48 52
49 cpio-data := $(obj)/initramfs_data.cpio 53 cpio-data := $(obj)/initramfs_data.cpio
50 54
51 hostprogs := gen_init_cpio 55 hostprogs := gen_init_cpio
52 56
53 # .initramfs_data.cpio.d is used to identify a 57 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are 58 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory ti 59 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_init 60 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj)/.initramfs_data.cpio.d 61 -include $(obj)/.initramfs_data.cpio.d
58 62
59 # do not try to update files included in initr 63 # do not try to update files included in initramfs
60 $(deps_initramfs): ; 64 $(deps_initramfs): ;
61 65
62 quiet_cmd_initfs = GEN $@ 66 quiet_cmd_initfs = GEN $@
63 cmd_initfs = \ 67 cmd_initfs = \
64 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.in 68 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
65 $(addprefix -u , $(CONFIG_INITRAMFS_RO !! 69 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
66 $(addprefix -g , $(CONFIG_INITRAMFS_RO !! 70 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
67 $(if $(KBUILD_BUILD_TIMESTAMP), -d "$( <<
68 $(ramfs-input) 71 $(ramfs-input)
69 72
70 # We rebuild initramfs_data.cpio if: 73 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs 74 # 1) Any included file is newer than initramfs_data.cpio
72 # 2) There are changes in which files are incl 75 # 2) There are changes in which files are included (added or deleted)
73 # 3) If gen_init_cpio are newer than initramfs 76 # 3) If gen_init_cpio are newer than initramfs_data.cpio
74 # 4) Arguments to gen_initramfs.sh changes 77 # 4) Arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram 78 $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
76 $(call if_changed,initfs) 79 $(call if_changed,initfs)
77 80
78 endif 81 endif
79 82
80 $(obj)/initramfs_inc_data: $(cpio-data) FORCE 83 $(obj)/initramfs_inc_data: $(cpio-data) FORCE
81 $(call if_changed,$(compress-y)) 84 $(call if_changed,$(compress-y))
82 85
83 targets += initramfs_data.cpio initramfs_inc_d 86 targets += initramfs_data.cpio initramfs_inc_data
84 87
85 subdir-$(CONFIG_UAPI_HEADER_TEST) += include 88 subdir-$(CONFIG_UAPI_HEADER_TEST) += include
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