xref: /linux/usr/Makefile (revision b24413180f5600bcb3bb70fbed5cf186b60864bd)
1*b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0
2d39a206bSSam Ravnborg#
3d39a206bSSam Ravnborg# kbuild file for usr/ - including initramfs image
4d39a206bSSam Ravnborg#
51da177e4SLinus Torvalds
6d39a206bSSam Ravnborgklibcdirs:;
748f1f058SSam RavnborgPHONY += klibcdirs
848f1f058SSam Ravnborg
9ae30ab4cSNicholas Pigginsuffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
109e3596b0SNicholas Piggindatafile_y = initramfs_data.cpio$(suffix_y)
119e3596b0SNicholas PigginAFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
129e3596b0SNicholas Piggin
136ae64e42SHendrik Brueckner
14d39a206bSSam Ravnborg# Generate builtin.o based on initramfs_data.o
156ae64e42SHendrik Bruecknerobj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
161da177e4SLinus Torvalds
17a26ee60fSAlain Knaff# initramfs_data.o contains the compressed initramfs_data.cpio image.
181da177e4SLinus Torvalds# The image is included using .incbin, a dependency which is not
191da177e4SLinus Torvalds# tracked automatically.
209e3596b0SNicholas Piggin$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
211da177e4SLinus Torvalds
22d39a206bSSam Ravnborg#####
23d39a206bSSam Ravnborg# Generate the initramfs cpio archive
24d39a206bSSam Ravnborg
25d39a206bSSam Ravnborghostprogs-y := gen_init_cpio
26d39a206bSSam Ravnborginitramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
27d39a206bSSam Ravnborgramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
28a26d79caSThomas Chou			$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
29d39a206bSSam Ravnborgramfs-args  := \
30d39a206bSSam Ravnborg        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
31ff541710SNickolay        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
32d39a206bSSam Ravnborg
33a26ee60fSAlain Knaff# .initramfs_data.cpio.d is used to identify all files included
34d39a206bSSam Ravnborg# in initramfs and to detect if any files are added/removed.
35d39a206bSSam Ravnborg# Removed files are identified by directory timestamp being updated
36d39a206bSSam Ravnborg# The dependency list is generated by gen_initramfs.sh -l
37a26ee60fSAlain Knaffifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
38a26ee60fSAlain Knaff	include $(obj)/.initramfs_data.cpio.d
391da177e4SLinus Torvaldsendif
401da177e4SLinus Torvalds
41d39a206bSSam Ravnborgquiet_cmd_initfs = GEN     $@
42d39a206bSSam Ravnborg      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
431da177e4SLinus Torvalds
449e3596b0SNicholas Piggintargets := $(datafile_y)
459e3596b0SNicholas Piggin
4658a2f7d8SSam Ravnborg# do not try to update files included in initramfs
4758a2f7d8SSam Ravnborg$(deps_initramfs): ;
4858a2f7d8SSam Ravnborg
49d39a206bSSam Ravnborg$(deps_initramfs): klibcdirs
50a26ee60fSAlain Knaff# We rebuild initramfs_data.cpio if:
51a26ee60fSAlain Knaff# 1) Any included file is newer then initramfs_data.cpio
52d39a206bSSam Ravnborg# 2) There are changes in which files are included (added or deleted)
53a26ee60fSAlain Knaff# 3) If gen_init_cpio are newer than initramfs_data.cpio
54d39a206bSSam Ravnborg# 4) arguments to gen_initramfs.sh changes
559e3596b0SNicholas Piggin$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
56a26ee60fSAlain Knaff	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
57d39a206bSSam Ravnborg	$(call if_changed,initfs)
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