internal/rosa: kernel artifact

The configuration still wants some cleanup, but this works fine as a generic kernel for now.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/kernel.go

@@ -41,3 +41,83 @@ func (t Toolchain) newKernelHeaders() pkg.Artifact {
 	)
 }
 func init() { artifactsF[KernelHeaders] = Toolchain.newKernelHeaders }
+
+func (t Toolchain) newKernel() pkg.Artifact {
+	return t.NewViaMake("kernel", kernelVersion, kernelSource, &MakeAttr{
+		OmitDefaults:  true,
+		SkipConfigure: true,
+
+		// Build, install, and boot kernel before running kselftest on it.
+		SkipCheck: true,
+
+		Env: []string{
+			"PATH=/system/sbin",
+		},
+		ScriptEarly: `
+install -Dm0400 \
+	/usr/src/.config \
+	/tmp/kbuild/.config
+install -Dm0500 \
+	/usr/src/.installkernel \
+	/sbin/installkernel
+`,
+		Make: []string{
+			"-f /usr/src/kernel/Makefile",
+			"O=/tmp/kbuild",
+
+			"LLVM=1",
+			"KBUILD_BUILD_VERSION='1-Rosa'",
+			"KBUILD_BUILD_TIMESTAMP='2106-02-07 06:28:15 UTC'",
+			"KBUILD_BUILD_USER=kbuild",
+			"KBUILD_BUILD_HOST=localhost",
+			"all",
+		},
+		ScriptInstall: `
+make \
+	"-j$(nproc)" \
+	-f /usr/src/kernel/Makefile \
+	O=/tmp/kbuild \
+	LLVM=1 \
+	INSTALL_PATH=/work \
+	install \
+	INSTALL_MOD_PATH=/work \
+	modules_install
+rm -v /work/lib/modules/` + kernelVersion + `/build
+`,
+
+		Paths: []pkg.ExecPath{
+			pkg.Path(AbsUsrSrc.Append(
+				".config",
+			), false, pkg.NewFile(".config", kernelConfig)),
+			pkg.Path(AbsUsrSrc.Append(
+				".installkernel",
+			), false, pkg.NewFile("installkernel", []byte(`#!/bin/sh -e
+echo "Installing linux $1..."
+cp -av "$2" "$4"
+cp -av "$3" "$4"
+`))),
+		},
+	},
+		t.Load(Flex),
+		t.Load(Bison),
+		t.Load(M4),
+		t.Load(Tar),
+		t.Load(Perl),
+		t.Load(BC),
+		t.Load(Sed),
+		t.Load(Gawk),
+		t.Load(Coreutils),
+		t.Load(Diffutils),
+
+		t.Load(XZ),
+		t.Load(Zlib),
+		t.Load(Gzip),
+		t.Load(Bzip2),
+		t.Load(Zstd),
+		t.Load(Kmod),
+		t.Load(Elfutils),
+		t.Load(OpenSSL),
+		t.Load(KernelHeaders),
+	)
+}
+func init() { artifactsF[Kernel] = Toolchain.newKernel }