projects/linux·blob v2.6.18 · refs

50 lines · 1.8 KiB

1#
2# kbuild file for usr/ - including initramfs image
3#
4
5klibcdirs:;
6
7# Generate builtin.o based on initramfs_data.o
8obj-y := initramfs_data.o
9
10# initramfs_data.o contains the initramfs_data.cpio.gz image.
11# The image is included using .incbin, a dependency which is not
12# tracked automatically.
13$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
14
15#####
16# Generate the initramfs cpio archive
17
18hostprogs-y := gen_init_cpio
19initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
20ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
21 $(CONFIG_INITRAMFS_SOURCE),-d)
22ramfs-args := \
23 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
24 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
25
26# .initramfs_data.cpio.gz.d is used to identify all files included
27# in initramfs and to detect if any files are added/removed.
28# Removed files are identified by directory timestamp being updated
29# The dependency list is generated by gen_initramfs.sh -l
30ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
31 include $(obj)/.initramfs_data.cpio.gz.d
32endif
33
34quiet_cmd_initfs = GEN $@
35 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
36
37targets := initramfs_data.cpio.gz
38# do not try to update files included in initramfs
39$(deps_initramfs): ;
40
41$(deps_initramfs): klibcdirs
42# We rebuild initramfs_data.cpio.gz if:
43# 1) Any included file is newer then initramfs_data.cpio.gz
44# 2) There are changes in which files are included (added or deleted)
45# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
46# 4) arguments to gen_initramfs.sh changes
47$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
48 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
49 $(call if_changed,initfs)
50