summaryrefslogtreecommitdiff
path: root/eclass/kernel-install.eclass
blob: 1fdeb1bf4dc7b1b1fd8661c5e5dd54e451abc5a9 (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: kernel-install.eclass
# @MAINTAINER:
# Distribution Kernel Project <dist-kernel@gentoo.org>
# @AUTHOR:
# Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Installation mechanics for Distribution Kernels
# @DESCRIPTION:
# This eclass provides the logic needed to test and install different
# kinds of Distribution Kernel packages, including both kernels built
# from source and distributed as binaries.  The eclass relies on the
# ebuild installing a subset of built kernel tree into
# /usr/src/linux-${PV} containing the kernel image in its standard
# location and System.map.
#
# The eclass exports src_test, pkg_postinst and pkg_postrm.
# Additionally, the inherited mount-boot eclass exports pkg_pretend.
# It also stubs out pkg_preinst and pkg_prerm defined by mount-boot.

if [[ ! ${_KERNEL_INSTALL_ECLASS} ]]; 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

inherit mount-boot

TCL_VER=10.1
SRC_URI+="
	test? (
		amd64? (
			https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-amd64.qcow2
		)
		x86? (
				https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-x86.qcow2
		)
	)"

SLOT="${PV}"
IUSE="+initramfs test"
RESTRICT+=" !test? ( test ) test? ( userpriv )"

# install-DEPEND actually
# note: we need installkernel with initramfs support!
RDEPEND="
	|| (
		sys-kernel/installkernel-gentoo
		sys-kernel/installkernel-systemd-boot
	)
	initramfs? ( >=sys-kernel/dracut-049-r3 )"
BDEPEND="
	test? (
		dev-tcltk/expect
		sys-kernel/dracut
		amd64? ( app-emulation/qemu[qemu_softmmu_targets_x86_64] )
		x86? ( app-emulation/qemu[qemu_softmmu_targets_i386] )
	)"

# @FUNCTION: kernel-install_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.
kernel-install_build_initramfs() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments"
	local output=${1}
	local version=${2}

	ebegin "Building initramfs via dracut"
	dracut --force "${output}" "${version}"
	eend ${?} || die "Building initramfs failed"
}

# @FUNCTION: kernel-install_get_image_path
# @DESCRIPTION:
# Get relative kernel image path specific to the current ${ARCH}.
kernel-install_get_image_path() {
	case ${ARCH} in
		amd64|x86)
			echo arch/x86/boot/bzImage
			;;
		*)
			die "${FUNCNAME}: unsupported ARCH=${ARCH}"
			;;
	esac
}

# @FUNCTION: kernel-install_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.
kernel-install_install_kernel() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${#} -eq 3 ]] || die "${FUNCNAME}: invalid arguments"
	local version=${1}
	local image=${2}
	local map=${3}

	ebegin "Installing the kernel via installkernel"
	# note: .config is taken relatively to System.map;
	# initrd relatively to bzImage
	installkernel "${version}" "${image}" "${map}"
	eend ${?} || die "Installing the kernel failed"
}

# @FUNCTION: kernel-install_update_symlink
# @USAGE: <target> <version>
# @DESCRIPTION:
# Update the kernel source symlink at <target> (full path) with a link
# to <target>-<version> if it's either missing or pointing out to
# an older version of this package.
kernel-install_update_symlink() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments"
	local target=${1}
	local version=${2}

	if [[ ! -e ${target} ]]; then
		ebegin "Creating ${target} symlink"
		ln -f -n -s "${target##*/}-${version}" "${target}"
		eend ${?}
	else
		local symlink_target=$(readlink "${target}")
		local symlink_ver=${symlink_target#${target##*/}-}
		if [[ ${symlink_target} == ${target##*/}-* && \
				-z ${symlink_ver//[0-9.]/} ]]
		then
			local symlink_pkg=${CATEGORY}/${PN}-${symlink_ver}
			# if the current target is either being replaced, or still
			# installed (probably depclean candidate), update the symlink
			if has "${symlink_ver}" ${REPLACING_VERSIONS} ||
					has_version -r "~${symlink_pkg}"
			then
				ebegin "Updating ${target} symlink"
				ln -f -n -s "${target##*/}-${version}" "${target}"
				eend ${?}
			fi
		fi
	fi
}

# @FUNCTION: kernel-install_get_qemu_arch
# @DESCRIPTION:
# Get appropriate qemu suffix for the current ${ARCH}.
kernel-install_get_qemu_arch() {
	debug-print-function ${FUNCNAME} "${@}"

	case ${ARCH} in
		amd64)
			echo x86_64
			;;
		x86)
			echo i386
			;;
		*)
			die "${FUNCNAME}: unsupported ARCH=${ARCH}"
			;;
	esac
}

# @FUNCTION: kernel-install_test
# @USAGE: <version> <image> <modules>
# @DESCRIPTION:
# Test that the kernel can successfully boot a minimal system image
# in qemu.  <version> is the kernel version, <image> path to the image,
# <modules> path to module tree.
kernel-install_test() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${#} -eq 3 ]] || die "${FUNCNAME}: invalid arguments"
	local version=${1}
	local image=${2}
	local modules=${3}

	local qemu_arch=$(kernel-install_get_qemu_arch)

	dracut \
		--conf /dev/null \
		--confdir /dev/null \
		--no-hostonly \
		--kmoddir "${modules}" \
		"${T}/initrd" "${version}" || die
	# get a read-write copy of the disk image
	cp "${DISTDIR}/tinycorelinux-${TCL_VER}-${ARCH}.qcow2" \
		"${T}/fs.qcow2" || die

	cd "${T}" || die
	cat > run.sh <<-EOF || die
		#!/bin/sh
		exec qemu-system-${qemu_arch} \
			-m 256M \
			-display none \
			-no-reboot \
			-kernel '${image}' \
			-initrd '${T}/initrd' \
			-serial mon:stdio \
			-hda '${T}/fs.qcow2' \
			-append 'root=/dev/sda console=ttyS0,115200n8'
	EOF
	chmod +x run.sh || die
	# TODO: initramfs does not let core finish starting on some systems,
	# figure out how to make it better at that
	expect - <<-EOF || die "Booting kernel failed"
		set timeout 900
		spawn ./run.sh
		expect {
			"Kernel panic" {
				send_error "\n* Kernel panic"
				exit 1
			}
			"Entering emergency mode" {
				send_error "\n* Initramfs failed to start the system"
				exit 1
			}
			"Core 10.1" {
				send_error "\n* Booted successfully"
				exit 0
			}
			timeout {
				send_error "\n* Kernel boot timed out"
				exit 2
			}
		}
	EOF
}

# @FUNCTION: kernel-install_src_test
# @DESCRIPTION:
# Boilerplate function to remind people to call the tests.
kernel-install_src_test() {
	debug-print-function ${FUNCNAME} "${@}"

	die "Please redefine src_test() and call kernel-install_test()."
}

# @FUNCTION: kernel-install_pkg_preinst
# @DESCRIPTION:
# Stub out mount-boot.eclass.
kernel-install_pkg_preinst() {
	debug-print-function ${FUNCNAME} "${@}"

	# (no-op)
}

# @FUNCTION: kernel-install_pkg_postinst
# @DESCRIPTION:
# Build an initramfs for the kernel, install it and update
# the /usr/src/linux symlink.
kernel-install_pkg_postinst() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ -z ${ROOT} ]]; then
		mount-boot_pkg_preinst

		local image_path=$(kernel-install_get_image_path)
		if use initramfs; then
			# putting it alongside kernel image as 'initrd' makes
			# kernel-install happier
			kernel-install_build_initramfs \
				"${EROOT}/usr/src/linux-${PV}/${image_path%/*}/initrd" \
				"${PV}"
		fi

		kernel-install_install_kernel "${PV}" \
			"${EROOT}/usr/src/linux-${PV}/${image_path}" \
			"${EROOT}/usr/src/linux-${PV}/System.map"
	fi

	kernel-install_update_symlink "${EROOT}/usr/src/linux" "${PV}"
}

# @FUNCTION: kernel-install_pkg_prerm
# @DESCRIPTION:
# Stub out mount-boot.eclass.
kernel-install_pkg_prerm() {
	debug-print-function ${FUNCNAME} "${@}"

	# (no-op)
}

# @FUNCTION: kernel-install_pkg_postrm
# @DESCRIPTION:
# No-op at the moment.  Will be used to remove obsolete kernels
# in the future.
kernel-install_pkg_postrm() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ -z ${ROOT} ]] && use initramfs; then
		local image_path=$(kernel-install_get_image_path)
		ebegin "Removing initramfs"
		rm -f "${EROOT}/usr/src/linux-${PV}/${image_path%/*}/initrd" &&
			find "${EROOT}/usr/src/linux-${PV}" -depth -type d -empty -delete
		eend ${?}
	fi
}

_KERNEL_INSTALL_ECLASS=1
fi

EXPORT_FUNCTIONS src_test pkg_preinst pkg_postinst pkg_prerm pkg_postrm