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initramfs: refactor the initramfs build rules
Currently, usr/gen_initramfs.sh takes care of all the use-cases:
[1] generates a cpio file unless CONFIG_INITRAMFS_SOURCE points to
a single cpio archive
[2] If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive,
use it as-is.
[3] Compress the cpio file according to CONFIG_INITRAMFS_COMPRESSION_*
unless it is passed a compressed archive.
To simplify the script, move [2] and [3] to usr/Makefile.
If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive, there is
no need to run this shell script.
For the cpio archive compression, you can re-use the rules from
scripts/Makefile.lib .
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada
parent
469e87e89f
commit
65e00e04e5
8
usr/.gitignore
vendored
8
usr/.gitignore
vendored
@ -1,9 +1,3 @@
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#
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# Generated files
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#
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gen_init_cpio
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initramfs_data.cpio
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initramfs_data.cpio.gz
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initramfs_data.cpio.bz2
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initramfs_data.cpio.lzma
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initramfs_list
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/initramfs_inc_data
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10
usr/Kconfig
10
usr/Kconfig
@ -207,13 +207,3 @@ config INITRAMFS_COMPRESSION_LZ4
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by default which could cause a build failure.
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endchoice
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config INITRAMFS_COMPRESSION
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string
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default "" if INITRAMFS_COMPRESSION_NONE
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default ".gz" if INITRAMFS_COMPRESSION_GZIP
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default ".bz2" if INITRAMFS_COMPRESSION_BZIP2
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default ".lzma" if INITRAMFS_COMPRESSION_LZMA
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default ".xz" if INITRAMFS_COMPRESSION_XZ
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default ".lzo" if INITRAMFS_COMPRESSION_LZO
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default ".lz4" if INITRAMFS_COMPRESSION_LZ4
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89
usr/Makefile
89
usr/Makefile
@ -3,55 +3,86 @@
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# kbuild file for usr/ - including initramfs image
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#
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suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
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datafile_y = initramfs_data.cpio$(suffix_y)
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datafile_d_y = .$(datafile_y).d
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AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
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# cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the
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# size at the end of the compressed file, which unfortunately does not work
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# with unpack_to_rootfs(). Make size_append no-op.
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override size_append := :
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# clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all
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# possible compression formats.
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clean-files += initramfs_data.cpio*
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compress-$(CONFIG_INITRAMFS_COMPRESSION_NONE) := shipped
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compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
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compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
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compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
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compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
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compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
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compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
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# Generate builtin.o based on initramfs_data.o
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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# initramfs_data.o contains the compressed initramfs_data.cpio image.
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# The image is included using .incbin, a dependency which is not
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# tracked automatically.
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$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
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$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
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#####
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# Generate the initramfs cpio archive
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ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
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cpio-data :=
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# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
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# default contents.
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ifeq ($(ramfs-input),)
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ramfs-input := $(srctree)/$(src)/default_cpio_list
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endif
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ifeq ($(words $(ramfs-input)),1)
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# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
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# .cpio, use it directly as an initramfs.
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ifneq ($(filter %.cpio,$(ramfs-input)),)
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cpio-data := $(ramfs-input)
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endif
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# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
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# .cpio.*, use it directly as an initramfs, and avoid double compression.
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ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
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cpio-data := $(ramfs-input)
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compress-y := shipped
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endif
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endif
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# For other cases, generate the initramfs cpio archive based on the contents
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# specified by CONFIG_INITRAMFS_SOURCE.
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ifeq ($(cpio-data),)
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cpio-data := $(obj)/initramfs_data.cpio
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hostprogs-y := gen_init_cpio
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ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
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$(shell echo $(CONFIG_INITRAMFS_SOURCE)),$(srctree)/$(src)/default_cpio_list)
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ramfs-args := \
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$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
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# $(datafile_d_y) is used to identify all files included
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# .initramfs_data.cpio.d is used to identify all files included
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# in initramfs and to detect if any files are added/removed.
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# Removed files are identified by directory timestamp being updated
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# The dependency list is generated by gen_initramfs.sh -l
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ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
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include $(obj)/$(datafile_d_y)
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endif
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quiet_cmd_initfs = GEN $@
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cmd_initfs = $(CONFIG_SHELL) $< -o $@ -l $(obj)/$(datafile_d_y) $(ramfs-args) $(ramfs-input)
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targets := $(datafile_y)
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-include $(obj)/.initramfs_data.cpio.d
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# do not try to update files included in initramfs
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$(deps_initramfs): ;
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quiet_cmd_initfs = GEN $@
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cmd_initfs = \
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$(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
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$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
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$(ramfs-input)
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# We rebuild initramfs_data.cpio if:
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# 1) Any included file is newer than initramfs_data.cpio
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# 2) There are changes in which files are included (added or deleted)
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# 3) If gen_init_cpio are newer than initramfs_data.cpio
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# 4) Arguments to gen_initramfs.sh changes
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$(obj)/$(datafile_y): $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
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$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
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$(call if_changed,initfs)
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endif
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$(obj)/initramfs_inc_data: $(cpio-data) FORCE
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$(call if_changed,$(compress-y))
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targets += initramfs_data.cpio initramfs_inc_data
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subdir-$(CONFIG_UAPI_HEADER_TEST) += include
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@ -5,7 +5,7 @@
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# Released under the terms of the GNU GPL
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#
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# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
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# the cpio archive, and then compresses it.
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# the cpio archive.
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# This script assumes that gen_init_cpio is located in usr/ directory
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# error out on errors
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@ -15,8 +15,7 @@ usage() {
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cat << EOF
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Usage:
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$0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
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-o <file> Create compressed initramfs file named <file> using
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gen_init_cpio and compressor depending on the extension
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-o <file> Create initramfs file named <file> by using gen_init_cpio
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-l <dep_list> Create dependency list named <dep_list>
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-u <uid> User ID to map to user ID 0 (root).
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<uid> is only meaningful if <cpio_source> is a
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@ -162,20 +161,12 @@ dir_filelist() {
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fi
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}
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# if only one file is specified and it is .cpio file then use it direct as fs
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# if a directory is specified then add all files in given direcotry to fs
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# if a regular file is specified assume it is in gen_init_cpio format
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input_file() {
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source="$1"
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if [ -f "$1" ]; then
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# If a regular file is specified, assume it is in
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# gen_init_cpio format
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header "$1"
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is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\{0,1\}/cpio/')"
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if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then
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cpio_file=$1
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echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
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[ -n "$dep_list" ] && echo "$1" >> $dep_list
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return 0
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fi
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print_mtime "$1" >> $cpio_list
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cat "$1" >> $cpio_list
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if [ -n "$dep_list" ]; then
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@ -187,6 +178,7 @@ input_file() {
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done
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fi
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elif [ -d "$1" ]; then
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# If a directory is specified then add all files in it to fs
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dir_filelist "$1"
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else
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echo " ${prog}: Cannot open '$1'" >&2
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@ -198,12 +190,8 @@ prog=$0
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root_uid=0
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root_gid=0
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dep_list=
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cpio_file=
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cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
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output="/dev/stdout"
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output_file="/dev/stdout"
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is_cpio_compressed=
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compr="gzip -n -9 -f"
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while [ $# -gt 0 ]; do
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arg="$1"
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@ -214,28 +202,8 @@ while [ $# -gt 0 ]; do
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echo "deps_initramfs := \\" > $dep_list
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shift
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;;
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"-o") # generate compressed cpio image named $1
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output_file="$1"
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output=$cpio_list
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echo "$output_file" | grep -q "\.gz$" \
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&& [ -x "`which gzip 2> /dev/null`" ] \
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&& compr="gzip -n -9 -f"
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echo "$output_file" | grep -q "\.bz2$" \
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&& [ -x "`which bzip2 2> /dev/null`" ] \
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&& compr="bzip2 -9 -f"
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echo "$output_file" | grep -q "\.lzma$" \
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&& [ -x "`which lzma 2> /dev/null`" ] \
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&& compr="lzma -9 -f"
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echo "$output_file" | grep -q "\.xz$" \
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&& [ -x "`which xz 2> /dev/null`" ] \
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&& compr="xz --check=crc32 --lzma2=dict=1MiB"
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echo "$output_file" | grep -q "\.lzo$" \
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&& [ -x "`which lzop 2> /dev/null`" ] \
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&& compr="lzop -9 -f"
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echo "$output_file" | grep -q "\.lz4$" \
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&& [ -x "`which lz4 2> /dev/null`" ] \
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&& compr="lz4 -l -9 -f"
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echo "$output_file" | grep -q "\.cpio$" && compr="cat"
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"-o") # generate cpio image named $1
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output="$1"
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shift
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;;
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"-u") # map $1 to uid=0 (root)
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@ -258,16 +226,15 @@ while [ $# -gt 0 ]; do
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unknown_option
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;;
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*) # input file/dir - process it
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input_file "$arg" "$#"
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input_file "$arg"
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;;
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esac
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;;
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esac
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done
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# If output_file is set we will generate cpio archive and compress it
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# If output_file is set we will generate cpio archive
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# we are careful to delete tmp files
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if [ -z ${cpio_file} ]; then
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timestamp=
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if test -n "$KBUILD_BUILD_TIMESTAMP"; then
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timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
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@ -275,17 +242,5 @@ if [ -z ${cpio_file} ]; then
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timestamp="-t $timestamp"
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fi
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fi
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cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
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usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
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else
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cpio_tfile=${cpio_file}
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fi
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rm ${cpio_list}
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if [ "${is_cpio_compressed}" = "compressed" ]; then
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cat ${cpio_tfile} > ${output_file}
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else
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(cat ${cpio_tfile} | ${compr} - > ${output_file}) \
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|| (rm -f ${output_file} ; false)
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fi
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[ -z ${cpio_file} ] && rm ${cpio_tfile}
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exit 0
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usr/gen_init_cpio $timestamp $cpio_list > $output
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rm $cpio_list
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@ -22,12 +22,9 @@
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in the ELF header, as required by certain architectures.
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*/
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#include <linux/stringify.h>
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#include <asm-generic/vmlinux.lds.h>
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.section .init.ramfs,"a"
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__irf_start:
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.incbin __stringify(INITRAMFS_IMAGE)
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.incbin "usr/initramfs_inc_data"
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__irf_end:
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.section .init.ramfs.info,"a"
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.globl __initramfs_size
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