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build.go
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build.go
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package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
_ "embed"
)
// see https://www.kernel.org/releases.json
var latest = "https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.9.1.tar.xz"
//go:embed config.addendum.txt
var configAddendum []byte
func downloadKernel() error {
out, err := os.Create(filepath.Base(latest))
if err != nil {
return err
}
defer out.Close()
resp, err := http.Get(latest)
if err != nil {
return err
}
defer resp.Body.Close()
if got, want := resp.StatusCode, http.StatusOK; got != want {
return fmt.Errorf("unexpected HTTP status code for %s: got %d, want %d", latest, got, want)
}
if _, err := io.Copy(out, resp.Body); err != nil {
return err
}
return out.Close()
}
func applyPatches(srcdir string) error {
patches, err := filepath.Glob("*.patch")
if err != nil {
return err
}
for _, patch := range patches {
log.Printf("applying patch %q", patch)
f, err := os.Open(patch)
if err != nil {
return err
}
defer f.Close()
cmd := exec.Command("patch", "-p1")
cmd.Dir = srcdir
cmd.Stdin = f
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return err
}
f.Close()
}
return nil
}
func compile() error {
defconfig := exec.Command("make", "ARCH=arm64", "defconfig")
defconfig.Stdout = os.Stdout
defconfig.Stderr = os.Stderr
if err := defconfig.Run(); err != nil {
return fmt.Errorf("make defconfig: %v", err)
}
// Change answers from mod to no if possible
mod2noconfig := exec.Command("make", "ARCH=arm64", "mod2noconfig")
mod2noconfig.Stdout = os.Stdout
mod2noconfig.Stderr = os.Stderr
if err := mod2noconfig.Run(); err != nil {
return fmt.Errorf("make olddefconfig: %v", err)
}
f, err := os.OpenFile(".config", os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return err
}
defer f.Close()
if _, err := f.Write(configAddendum); err != nil {
return err
}
if err := f.Close(); err != nil {
return err
}
olddefconfig := exec.Command("make", "ARCH=arm64", "olddefconfig")
olddefconfig.Stdout = os.Stdout
olddefconfig.Stderr = os.Stderr
if err := olddefconfig.Run(); err != nil {
return fmt.Errorf("make olddefconfig: %v", err)
}
env := append(os.Environ(),
"ARCH=arm64",
"CROSS_COMPILE=aarch64-linux-gnu-",
"KBUILD_BUILD_USER=gokrazy",
"KBUILD_BUILD_HOST=docker",
"KBUILD_BUILD_TIMESTAMP=Wed Mar 1 20:57:29 UTC 2017",
)
make := exec.Command("make", "Image.gz", "dtbs", "modules", "-j"+strconv.Itoa(runtime.NumCPU()))
make.Env = env
make.Stdout = os.Stdout
make.Stderr = os.Stderr
if err := make.Run(); err != nil {
return fmt.Errorf("make: %v", err)
}
make = exec.Command("make", "INSTALL_MOD_PATH=/tmp/buildresult", "modules_install", "-j"+strconv.Itoa(runtime.NumCPU()))
make.Env = env
make.Stdout = os.Stdout
make.Stderr = os.Stderr
if err := make.Run(); err != nil {
return fmt.Errorf("make: %v", err)
}
return nil
}
func copyFile(dest, src string) error {
out, err := os.Create(dest)
if err != nil {
return err
}
defer out.Close()
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
if _, err := io.Copy(out, in); err != nil {
return err
}
st, err := in.Stat()
if err != nil {
return err
}
if err := out.Chmod(st.Mode()); err != nil {
return err
}
return out.Close()
}
func main() {
log.Printf("downloading kernel source: %s", latest)
if err := downloadKernel(); err != nil {
log.Fatal(err)
}
log.Printf("unpacking kernel source")
untar := exec.Command("tar", "xf", filepath.Base(latest))
untar.Stdout = os.Stdout
untar.Stderr = os.Stderr
if err := untar.Run(); err != nil {
log.Fatalf("untar: %v", err)
}
srcdir := strings.TrimSuffix(filepath.Base(latest), ".tar.xz")
log.Printf("applying patches")
if err := applyPatches(srcdir); err != nil {
log.Fatal(err)
}
if err := os.Chdir(srcdir); err != nil {
log.Fatal(err)
}
log.Printf("compiling kernel")
if err := compile(); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/vmlinuz", "arch/arm64/boot/Image"); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/bcm2710-rpi-3-b.dtb", "arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dtb"); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/bcm2710-rpi-3-b-plus.dtb", "arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b-plus.dtb"); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/bcm2710-rpi-cm3.dtb", "arch/arm64/boot/dts/broadcom/bcm2837-rpi-cm3-io3.dtb"); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/bcm2711-rpi-4-b.dtb", "arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dtb"); err != nil {
log.Fatal(err)
}
if err := copyFile("/tmp/buildresult/bcm2710-rpi-zero-2-w.dtb", "arch/arm64/boot/dts/broadcom/bcm2837-rpi-zero-2-w.dtb"); err != nil {
log.Fatal(err)
}
}