sys-kernel/vanilla-kernel-bin: Enable qemu-based testing

Run a quick test whether the built kernel can boot a simple distribution
based on Tiny Core Linux.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

2 files changed, 72 insertions, 2 deletions

diff --git a/sys-kernel/vanilla-kernel-bin/Manifest b/sys-kernel/vanilla-kernel-bin/Manifest
index f6929ff3c520..f02625fd229c 100644
--- a/sys-kernel/vanilla-kernel-bin/Manifest
+++ b/sys-kernel/vanilla-kernel-bin/Manifest
@@ -1,2 +1,4 @@
+DIST tinycorelinux-10.1-amd64.qcow2 16842752 BLAKE2B e013e76503c335739a9623c0901ca791937a0e6b177854535cadec1e2c2cd2df588283ed3128cf652595f32264fbfe5b3bd3a8c97665fd4da344e308535be366 SHA512 c3aeb20ff8769da9211694b7f701907cc7ae7582cdfad2c2fdc008d97ebcbd9dc08245b4e8f8450e1cb304bd705345a11fe79f901a47979fee91443841d55641
+DIST tinycorelinux-10.1-x86.qcow2 14876672 BLAKE2B 3c760eb7438b13261e52ecfaa33a53649ced95f1ab40aae52134b8cdc31a16d7aa0d6a6dd716e268ed148e9d77a10b7c700b141b61d70c82d271ffe88e8e2a3c SHA512 9964538dc42f232a11949f74b61d46422ea5da3bdc253a217119bd0b8a750c40fd2da0b07157067be9ac0226472614f210a1248114df0d331df390979867a895
 DIST vanilla-kernel-5.4.6-r1-1.amd64.xpak 89795144 BLAKE2B cca6e78f991cc79165a528d95fa1202b6f99dcf763f890609a0bf3e273cb81e786e39365a89e14282b75e259aa298b7349ee2868ef8437faae400475ad7e1c42 SHA512 de609b831db05c42350fe57e3248be3208c190ff99082088b5d2a1d69ec54734784f8143befbfd397deb9446228781ba25c1e50ecc020a651f6beda30be6ba97
 DIST vanilla-kernel-5.4.6-r1-1.x86.xpak 81308308 BLAKE2B f499c5a8e65d3754fd0e1ba65a2dfa7eb4fa9b8cbdf5e5957186dc40b1c5572dd66433284529b0ca93b7a3073103243d5f45ad8749ca891b1f86d838cbf363be SHA512 f8334097566ce8b1852ec65a5205221a2bb5193fc638756e87f6da2199cde1d1e73f85f9dd60679fccd18be11055c37da873b92a0e209775e7a9926f6ae94134
diff --git a/sys-kernel/vanilla-kernel-bin/vanilla-kernel-bin-5.4.6.ebuild b/sys-kernel/vanilla-kernel-bin/vanilla-kernel-bin-5.4.6.ebuild
index 4908786bffb8..6d1186eafb6e 100644
--- a/sys-kernel/vanilla-kernel-bin/vanilla-kernel-bin-5.4.6.ebuild
+++ b/sys-kernel/vanilla-kernel-bin/vanilla-kernel-bin-5.4.6.ebuild
@@ -6,23 +6,31 @@ EAPI=7
 inherit mount-boot
 
 MY_P=vanilla-kernel-${PV}-r1-1
+TCL_VER=10.1
 DESCRIPTION="Pre-built vanilla Linux kernel"
 HOMEPAGE="https://www.kernel.org/"
 SRC_URI="
 	amd64? (
 		https://dev.gentoo.org/~mgorny/binpkg/amd64/kernel/sys-kernel/vanilla-kernel/${MY_P}.xpak
 			-> ${MY_P}.amd64.xpak
+		test? (
+			https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-amd64.qcow2
+		)
 	)
 	x86? (
 		https://dev.gentoo.org/~mgorny/binpkg/x86/kernel/sys-kernel/vanilla-kernel/${MY_P}.xpak
 			-> ${MY_P}.x86.xpak
+		test? (
+			https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-x86.qcow2
+		)
 	)"
 S=${WORKDIR}
 
 LICENSE="GPL-2"
 SLOT="${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+initramfs"
+IUSE="+initramfs test"
+RESTRICT="!test? ( test ) test? ( userpriv )"
 
 # install-DEPEND actually
 # note: we need installkernel with initramfs support!
@@ -31,8 +39,15 @@ RDEPEND="
 		sys-kernel/installkernel-gentoo
 		sys-kernel/installkernel-systemd-boot
 	)
-	initramfs? ( sys-kernel/dracut )
+	initramfs? ( >=sys-kernel/dracut-049-r2 )
 	!sys-kernel/vanilla-kernel:${SLOT}"
+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] )
+	)"
 
 QA_PREBUILT='*'
 
@@ -50,6 +65,59 @@ src_unpack() {
 	eend ${?} || die "Unpacking ${MY_P} failed"
 }
 
+src_test() {
+	local image_arch=${ARCH}
+	local qemu_arch=$(usex amd64 x86_64 i386)
+
+	dracut \
+		--conf /dev/null \
+		--confdir /dev/null \
+		--no-hostonly \
+		--kmoddir "lib/modules/${PV}" \
+		"${T}/initrd" "${PV}" || die
+	cp "${DISTDIR}/tinycorelinux-${TCL_VER}-${image_arch}.qcow2" \
+		"${T}/fs.qcow2" || die
+
+	cd "${T}" || die
+	cat > run.sh <<-EOF || die
+		#!/bin/sh
+		exec qemu-system-${qemu_arch} \
+			-m 256M \
+			-display none \
+			-no-reboot \
+			-kernel '${WORKDIR}/usr/src/linux-${PV}/bzImage' \
+			-initrd '${T}/initrd' \
+			-serial mon:stdio \
+			-hda '${T}/fs.qcow2' \
+			-append 'root=/dev/sda console=ttyS0,115200n8'
+	EOF
+	chmod +x run.sh || die
+	# TODO: initramfs does not let core finish starting on some systems,
+	# figure out how to make it better at that
+	expect - <<-EOF || die "Booting kernel failed"
+		set timeout 900
+		spawn ./run.sh
+		expect {
+			"Kernel panic" {
+				send_error "\n* Kernel panic"
+				exit 1
+			}
+			"Entering emergency mode" {
+				send_error "\n* Initramfs failed to start the system"
+				exit 1
+			}
+			"Core 10.1" {
+				send_error "\n* Booted to login"
+				exit 0
+			}
+			timeout {
+				send_error "\n* Kernel boot timed out"
+				exit 2
+			}
+		}
+	EOF
+}
+
 src_install() {
 	# cp is easier for preserving +x bits
 	cp -p -R . "${ED}" || die