blob: d192c31db27380ba2ff7fc9932718b08fe0f5790 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
# Copyright 2020-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: dist-kernel-utils.eclass
# @MAINTAINER:
# Distribution Kernel Project <dist-kernel@gentoo.org>
# @AUTHOR:
# Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Utility functions related to Distribution Kernels
# @DESCRIPTION:
# This eclass provides various utility functions related to Distribution
# Kernels.
if [[ ! ${_DIST_KERNEL_UTILS} ]]; then
case "${EAPI:-0}" in
0|1|2|3|4|5|6)
die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
;;
7)
;;
*)
die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
;;
esac
# @FUNCTION: dist-kernel_build_initramfs
# @USAGE: <output> <version>
# @DESCRIPTION:
# Build an initramfs for the kernel. <output> specifies the absolute
# path where initramfs will be created, while <version> specifies
# the kernel version, used to find modules.
#
# Note: while this function uses dracut at the moment, other initramfs
# variants may be supported in the future.
dist-kernel_build_initramfs() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments"
local output=${1}
local version=${2}
local rel_image_path=$(dist-kernel_get_image_path)
local image=${output%/*}/${rel_image_path##*/}
local args=(
--force
# if uefi=yes is used, dracut needs to locate the kernel image
--kernel-image "${image}"
# positional arguments
"${output}" "${version}"
)
ebegin "Building initramfs via dracut"
dracut "${args[@]}"
eend ${?} || die -n "Building initramfs failed"
}
# @FUNCTION: dist-kernel_get_image_path
# @DESCRIPTION:
# Get relative kernel image path specific to the current ${ARCH}.
dist-kernel_get_image_path() {
case ${ARCH} in
amd64|x86)
echo arch/x86/boot/bzImage
;;
arm64)
echo arch/arm64/boot/Image.gz
;;
arm)
echo arch/arm/boot/zImage
;;
hppa|ppc|ppc64)
# https://www.kernel.org/doc/html/latest/powerpc/bootwrapper.html
# ./ is required because of ${image_path%/*}
# substitutions in the code
echo ./vmlinux
;;
riscv)
echo arch/riscv/boot/Image.gz
;;
*)
die "${FUNCNAME}: unsupported ARCH=${ARCH}"
;;
esac
}
# @FUNCTION: dist-kernel_install_kernel
# @USAGE: <version> <image> <system.map>
# @DESCRIPTION:
# Install kernel using installkernel tool. <version> specifies
# the kernel version, <image> full path to the image, <system.map>
# full path to System.map.
dist-kernel_install_kernel() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${#} -eq 3 ]] || die "${FUNCNAME}: invalid arguments"
local version=${1}
local image=${2}
local map=${3}
# if dracut is used in uefi=yes mode, initrd will actually
# be a combined kernel+initramfs UEFI executable. we can easily
# recognize it by PE magic (vs cpio for a regular initramfs)
local initrd=${image%/*}/initrd
local magic
[[ -s ${initrd} ]] && read -n 2 magic < "${initrd}"
if [[ ${magic} == MZ ]]; then
einfo "Combined UEFI kernel+initramfs executable found"
# install the combined executable in place of kernel
image=${initrd}.uefi
mv "${initrd}" "${image}" || die
# put an empty file in place of initrd. installing a duplicate
# file would waste disk space, and removing it entirely provokes
# kernel-install to regenerate it via dracut.
> "${initrd}"
fi
ebegin "Installing the kernel via installkernel"
# note: .config is taken relatively to System.map;
# initrd relatively to bzImage
installkernel "${version}" "${image}" "${map}"
eend ${?} || die -n "Installing the kernel failed"
}
# @FUNCTION: dist-kernel_reinstall_initramfs
# @USAGE: <kv-dir> <kv-full>
# @DESCRIPTION:
# Rebuild and install initramfs for the specified dist-kernel.
# <kv-dir> is the kernel source directory (${KV_DIR} from linux-info),
# while <kv-full> is the full kernel version (${KV_FULL}).
# The function will determine whether <kernel-dir> is actually
# a dist-kernel, and whether initramfs was used.
#
# This function is to be used in pkg_postinst() of ebuilds installing
# kernel modules that are included in the initramfs.
dist-kernel_reinstall_initramfs() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments"
local kernel_dir=${1}
local ver=${2}
local image_path=${kernel_dir}/$(dist-kernel_get_image_path)
local initramfs_path=${image_path%/*}/initrd
if [[ ! -f ${image_path} ]]; then
eerror "Kernel install missing, image not found:"
eerror " ${image_path}"
eerror "Initramfs will not be updated. Please reinstall your kernel."
return
fi
if [[ ! -f ${initramfs_path} ]]; then
einfo "No initramfs found at ${initramfs_path}"
return
fi
dist-kernel_build_initramfs "${initramfs_path}" "${ver}"
dist-kernel_install_kernel "${ver}" "${image_path}" \
"${kernel_dir}/System.map"
}
_DIST_KERNEL_UTILS=1
fi
|
