1
0
out-of-tree/kernel.go

843 lines
20 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// Copyright 2023 Mikhail Klementev. All rights reserved.
// Use of this source code is governed by a AGPLv3 license
// (or later) that can be found in the LICENSE file.
package main
import (
"errors"
"fmt"
"io/ioutil"
"math"
"math/rand"
"os"
"os/exec"
"os/signal"
"os/user"
"regexp"
"runtime"
"strings"
"time"
"github.com/naoina/toml"
"github.com/rs/zerolog/log"
"code.dumpstack.io/tools/out-of-tree/config"
)
type KernelCmd struct {
NoDownload bool `help:"do not download qemu image while kernel generation"`
UseHost bool `help:"also use host kernels"`
Force bool `help:"force reinstall kernel"`
NoHeaders bool `help:"do not install kernel headers"`
Shuffle bool `help:"randomize kernels installation order"`
Retries int64 `help:"amount of tries for each kernel" default:"10"`
List KernelListCmd `cmd:"" help:"list kernels"`
Autogen KernelAutogenCmd `cmd:"" help:"generate kernels based on the current config"`
Genall KernelGenallCmd `cmd:"" help:"generate all kernels for distro"`
Install KernelInstallCmd `cmd:"" help:"install specific kernel"`
ConfigRegen KernelConfigRegenCmd `cmd:"" help:"regenerate config"`
}
type KernelListCmd struct{}
func (cmd *KernelListCmd) Run(g *Globals) (err error) {
kcfg, err := config.ReadKernelConfig(g.Config.Kernels)
if err != nil {
log.Debug().Err(err).Msg("read kernel config")
}
if len(kcfg.Kernels) == 0 {
return errors.New("No kernels found")
}
for _, k := range kcfg.Kernels {
fmt.Println(k.DistroType, k.DistroRelease, k.KernelRelease)
}
return
}
type KernelAutogenCmd struct {
Max int64 `help:"download kernels from set defined by regex in release_mask, but no more than X for each of release_mask" default:"100500"`
}
func (cmd KernelAutogenCmd) Run(kernelCmd *KernelCmd, g *Globals) (err error) {
ka, err := config.ReadArtifactConfig(g.WorkDir + "/.out-of-tree.toml")
if err != nil {
return
}
shutdown := false
setSigintHandler(&shutdown)
for _, sk := range ka.SupportedKernels {
if sk.DistroRelease == "" {
err = errors.New("Please set distro_release")
return
}
err = generateKernels(sk,
g.Config.Docker.Registry,
g.Config.Docker.Commands,
cmd.Max, kernelCmd.Retries,
!kernelCmd.NoDownload,
kernelCmd.Force,
!kernelCmd.NoHeaders,
kernelCmd.Shuffle,
&shutdown,
)
if err != nil {
return
}
if shutdown {
break
}
}
return updateKernelsCfg(kernelCmd.UseHost, !kernelCmd.NoDownload)
}
type KernelGenallCmd struct {
Distro string `required:"" help:"distribution"`
Ver string `required:"" help:"distro version"`
}
func (cmd *KernelGenallCmd) Run(kernelCmd *KernelCmd, g *Globals) (err error) {
distroType, err := config.NewDistroType(cmd.Distro)
if err != nil {
return
}
shutdown := false
setSigintHandler(&shutdown)
km := config.KernelMask{
DistroType: distroType,
DistroRelease: cmd.Ver,
ReleaseMask: ".*",
}
err = generateKernels(km,
g.Config.Docker.Registry,
g.Config.Docker.Commands,
math.MaxUint32, kernelCmd.Retries,
!kernelCmd.NoDownload,
kernelCmd.Force,
!kernelCmd.NoHeaders,
kernelCmd.Shuffle,
&shutdown,
)
if err != nil {
return
}
return updateKernelsCfg(kernelCmd.UseHost, !kernelCmd.NoDownload)
}
type KernelInstallCmd struct {
Distro string `required:"" help:"distribution"`
Ver string `required:"" help:"distro version"`
Kernel string `required:"" help:"kernel release mask"`
}
func (cmd *KernelInstallCmd) Run(kernelCmd *KernelCmd, g *Globals) (err error) {
distroType, err := config.NewDistroType(cmd.Distro)
if err != nil {
return
}
shutdown := false
setSigintHandler(&shutdown)
km := config.KernelMask{
DistroType: distroType,
DistroRelease: cmd.Ver,
ReleaseMask: cmd.Kernel,
}
err = generateKernels(km,
g.Config.Docker.Registry,
g.Config.Docker.Commands,
math.MaxUint32, kernelCmd.Retries,
!kernelCmd.NoDownload,
kernelCmd.Force,
!kernelCmd.NoHeaders,
kernelCmd.Shuffle,
&shutdown,
)
if err != nil {
return
}
return updateKernelsCfg(kernelCmd.UseHost, !kernelCmd.NoDownload)
}
type KernelConfigRegenCmd struct{}
func (cmd *KernelConfigRegenCmd) Run(kernelCmd *KernelCmd, g *Globals) (err error) {
return updateKernelsCfg(kernelCmd.UseHost, !kernelCmd.NoDownload)
}
func matchDebImagePkg(container, mask string) (pkgs []string, err error) {
cmd := "apt-cache search --names-only '^linux-image-[0-9\\.\\-]*-generic' | awk '{ print $1 }'"
// FIXME timeout should be in global out-of-tree config
c, err := NewContainer(container, time.Hour)
if err != nil {
return
}
output, err := c.Run(tempDirBase, cmd)
if err != nil {
return
}
r, err := regexp.Compile("linux-image-" + mask)
if err != nil {
return
}
for _, pkg := range strings.Fields(output) {
if r.MatchString(pkg) || strings.Contains(pkg, mask) {
pkgs = append(pkgs, pkg)
}
}
return
}
func matchCentOSDevelPkg(container, mask string, generic bool) (
pkgs []string, err error) {
cmd := "yum search kernel-devel --showduplicates | " +
"grep '^kernel-devel' | cut -d ' ' -f 1"
// FIXME timeout should be in global out-of-tree config
c, err := NewContainer(container, time.Hour)
if err != nil {
return
}
output, err := c.Run(tempDirBase, cmd)
if err != nil {
return
}
r, err := regexp.Compile("kernel-devel-" + mask)
if err != nil {
return
}
for _, pkg := range strings.Fields(output) {
if r.MatchString(pkg) || strings.Contains(pkg, mask) {
pkgs = append(pkgs, pkg)
}
}
return
}
func matchOracleLinuxPkg(container, mask string) (
pkgs []string, err error) {
cmd := "yum search kernel --showduplicates " +
"| grep '^kernel-[0-9]\\|^kernel-uek-[0-9]' " +
"| grep -v src " +
"| cut -d ' ' -f 1"
// FIXME timeout should be in global out-of-tree config
c, err := NewContainer(container, time.Hour)
if err != nil {
return
}
output, err := c.Run(tempDirBase, cmd)
if err != nil {
return
}
r, err := regexp.Compile("kernel-" + mask)
if err != nil {
return
}
for _, pkg := range strings.Fields(output) {
if r.MatchString(pkg) || strings.Contains(pkg, mask) {
log.Trace().Msg(pkg)
pkgs = append(pkgs, pkg)
}
}
return
}
func dockerImagePath(sk config.KernelMask) (path string, err error) {
usr, err := user.Current()
if err != nil {
return
}
path = usr.HomeDir + "/.out-of-tree/containers/"
path += sk.DistroType.String() + "/" + sk.DistroRelease
return
}
func vsyscallAvailable() (available bool, err error) {
if runtime.GOOS != "linux" {
// Docker for non-Linux systems is not using the host
// kernel but uses kernel inside a virtual machine, so
// it builds by the Docker team with vsyscall support.
available = true
return
}
buf, err := ioutil.ReadFile("/proc/self/maps")
if err != nil {
return
}
available = strings.Contains(string(buf), "[vsyscall]")
return
}
func generateBaseDockerImage(registry string, commands []config.DockerCommand,
sk config.KernelMask) (err error) {
imagePath, err := dockerImagePath(sk)
if err != nil {
return
}
dockerPath := imagePath + "/Dockerfile"
d := "# BASE\n"
// TODO move as function to container.go
cmd := exec.Command(containerRuntime, "images", "-q", sk.DockerName())
log.Debug().Msgf("run %v", cmd)
rawOutput, err := cmd.CombinedOutput()
if err != nil {
return
}
if exists(dockerPath) && string(rawOutput) != "" {
log.Info().Msgf("Base image for %s:%s found",
sk.DistroType.String(), sk.DistroRelease)
return
}
log.Info().Msgf("Base image for %s:%s not found, start generating",
sk.DistroType.String(), sk.DistroRelease)
os.MkdirAll(imagePath, os.ModePerm)
d += "FROM "
if registry != "" {
d += registry + "/"
}
d += fmt.Sprintf("%s:%s\n",
strings.ToLower(sk.DistroType.String()),
sk.DistroRelease,
)
vsyscall, err := vsyscallAvailable()
if err != nil {
return
}
for _, c := range commands {
d += "RUN " + c.Command + "\n"
}
switch sk.DistroType {
case config.Ubuntu:
d += "ENV DEBIAN_FRONTEND=noninteractive\n"
d += "RUN apt-get update\n"
d += "RUN apt-get install -y build-essential libelf-dev\n"
d += "RUN apt-get install -y wget git\n"
// Install a single kernel and headers to ensure all dependencies are cached
d += "RUN export PKGNAME=$(apt-cache search --names-only '^linux-headers-[0-9\\.\\-]*-generic' | awk '{ print $1 }' | head -n 1); " +
"apt-get install -y $PKGNAME $(echo $PKGNAME | sed 's/headers/image/'); " +
"apt-get remove -y $PKGNAME $(echo $PKGNAME | sed 's/headers/image/')\n"
if sk.DistroRelease >= "14.04" {
d += "RUN apt-get install -y libseccomp-dev\n"
}
d += "RUN mkdir -p /lib/modules\n"
case config.CentOS:
if sk.DistroRelease < "7" && !vsyscall {
log.Print("Old CentOS requires `vsyscall=emulate` " +
"on the latest kernels")
log.Print("Check out `A note about vsyscall` " +
"at https://hub.docker.com/_/centos")
log.Print("See also https://lwn.net/Articles/446528/")
err = fmt.Errorf("vsyscall is not available")
return
} else if sk.DistroRelease == "8" {
// CentOS 8 doesn't have Vault repos by default
for _, repover := range []string{
"8.0.1905", "8.1.1911", "8.2.2004", "8.3.2011", "8.4.2105", "8.5.2111",
} {
repo := fmt.Sprintf("[%s]\\nbaseurl=http://vault.centos.org/%s/BaseOS/$basearch/os/\\ngpgcheck=0", repover, repover)
d += fmt.Sprintf("RUN echo -e '%s' >> /etc/yum.repos.d/CentOS-Vault.repo\n", repo)
}
d += "RUN sed -i 's/enabled=1/enabled=0/' /etc/yum.repos.d/*\n"
}
// enable rpms from old minor releases
d += "RUN sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/CentOS-Vault.repo\n"
// do not remove old kernels
d += "RUN sed -i 's;installonly_limit=;installonly_limit=100500;' /etc/yum.conf\n"
d += "RUN yum -y update\n"
d += "RUN yum -y groupinstall 'Development Tools'\n"
if sk.DistroRelease < "8" {
d += "RUN yum -y install deltarpm\n"
} else {
d += "RUN yum -y install grub2-tools-minimal " +
"elfutils-libelf-devel\n"
}
var flags string
if sk.DistroRelease >= "8" {
flags = "--noautoremove"
}
// Cache kernel package dependencies
d += "RUN export PKGNAME=$(yum search kernel-devel --showduplicates | grep '^kernel-devel' | cut -d ' ' -f 1 | head -n 1); " +
"yum -y install $PKGNAME $(echo $PKGNAME | sed 's/-devel//'); " +
fmt.Sprintf("yum -y remove $PKGNAME "+
"$(echo $PKGNAME | sed 's/-devel//') "+
"$(echo $PKGNAME | sed 's/-devel/-modules/') "+
"$(echo $PKGNAME | sed 's/-devel/-core/') %s\n", flags)
case config.OracleLinux:
if sk.DistroRelease < "6" {
err = fmt.Errorf("no support for pre-EL6")
return
}
d += "RUN sed -i 's/enabled=0/enabled=1/' /etc/yum.repos.d/*\n"
d += "RUN sed -i 's;installonly_limit=;installonly_limit=100500;' /etc/yum.conf /etc/dnf/dnf.conf || true\n"
d += "RUN yum -y update\n"
d += "RUN yum -y groupinstall 'Development Tools'\n"
d += "RUN yum -y install linux-firmware grubby\n"
default:
err = fmt.Errorf("%s not yet supported", sk.DistroType.String())
return
}
d += "# END BASE\n\n"
err = ioutil.WriteFile(dockerPath, []byte(d), 0644)
if err != nil {
return
}
c, err := NewContainer(sk.DockerName(), time.Hour)
if err != nil {
return
}
output, err := c.Build(imagePath)
if err != nil {
log.Error().Err(err).Msgf("Base image for %s:%s generating error",
sk.DistroType.String(), sk.DistroRelease)
log.Fatal().Msg(output)
return
}
log.Info().Msgf("Base image for %s:%s generating success",
sk.DistroType.String(), sk.DistroRelease)
return
}
func installKernel(sk config.KernelMask, pkgname string, force, headers bool) (err error) {
slog := log.With().
Str("distro_type", sk.DistroType.String()).
Str("distro_release", sk.DistroRelease).
Str("pkg", pkgname).
Logger()
c, err := NewContainer(sk.DockerName(), time.Hour) // TODO conf
if err != nil {
return
}
moddirs, err := ioutil.ReadDir(c.Volumes.LibModules)
if err != nil {
return
}
for _, krel := range moddirs {
if strings.Contains(pkgname, krel.Name()) {
if force {
slog.Info().Msg("Reinstall")
} else {
slog.Info().Msg("Already installed")
return
}
}
}
volumes := c.Volumes
c.Volumes.LibModules = ""
c.Volumes.UsrSrc = ""
c.Volumes.Boot = ""
slog.Debug().Msgf("Installing kernel")
cmd := "true"
switch sk.DistroType {
case config.Ubuntu:
var headerspkg string
if headers {
headerspkg = strings.Replace(pkgname, "image", "headers", -1)
}
cmd += fmt.Sprintf(" && apt-get install -y %s %s", pkgname, headerspkg)
case config.CentOS:
imagepkg := strings.Replace(pkgname, "-devel", "", -1)
version := strings.Replace(pkgname, "kernel-devel-", "", -1)
if !headers {
pkgname = ""
}
cmd += fmt.Sprintf(" && yum -y install %s %s", imagepkg,
pkgname)
cmd += fmt.Sprintf(" && dracut --add-drivers 'e1000 ext4' -fv "+
"/boot/initramfs-%s.img %s", version, version)
case config.OracleLinux:
var headerspkg string
if headers {
if strings.Contains(pkgname, "uek") {
headerspkg = strings.Replace(pkgname,
"kernel-uek", "kernel-uek-devel", -1)
} else {
headerspkg = strings.Replace(pkgname,
"kernel", "kernel-devel", -1)
}
}
cmd += fmt.Sprintf(" && yum -y install %s %s", pkgname, headerspkg)
var version string
if strings.Contains(pkgname, "uek") {
version = strings.Replace(pkgname, "kernel-uek-", "", -1)
} else {
version = strings.Replace(pkgname, "kernel-", "", -1)
}
cmd += fmt.Sprintf(" && dracut --add-drivers 'e1000 ext4' -f -v "+
"/boot/initramfs-%s.img %s", version, version)
default:
err = fmt.Errorf("%s not yet supported", sk.DistroType.String())
return
}
c.Args = append(c.Args, "-v", volumes.LibModules+":/target/lib/modules")
c.Args = append(c.Args, "-v", volumes.UsrSrc+":/target/usr/src")
c.Args = append(c.Args, "-v", volumes.Boot+":/target/boot")
cmd += " && cp -r /boot /target/"
cmd += " && cp -r /lib/modules /target/lib/"
cmd += " && cp -r /usr/src /target/usr/"
_, err = c.Run("", cmd)
if err != nil {
return
}
slog.Debug().Msgf("Success")
return
}
func findKernelFile(files []os.FileInfo, kname string) (name string, err error) {
for _, file := range files {
if strings.HasPrefix(file.Name(), "vmlinuz") {
if strings.Contains(file.Name(), kname) {
name = file.Name()
return
}
}
}
err = errors.New("cannot find kernel")
return
}
func findInitrdFile(files []os.FileInfo, kname string) (name string, err error) {
for _, file := range files {
if strings.HasPrefix(file.Name(), "initrd") ||
strings.HasPrefix(file.Name(), "initramfs") {
if strings.Contains(file.Name(), kname) {
name = file.Name()
return
}
}
}
err = errors.New("cannot find kernel")
return
}
func genRootfsImage(d containerImageInfo, download bool) (rootfs string, err error) {
usr, err := user.Current()
if err != nil {
return
}
imageFile := d.Name + ".img"
imagesPath := usr.HomeDir + "/.out-of-tree/images/"
os.MkdirAll(imagesPath, os.ModePerm)
rootfs = imagesPath + imageFile
if !exists(rootfs) {
if download {
log.Info().Msgf("%v not available, start download", imageFile)
err = downloadImage(imagesPath, imageFile)
}
}
return
}
func updateKernelsCfg(host, download bool) (err error) {
newkcfg := config.KernelConfig{}
if host {
// Get host kernels
newkcfg, err = genHostKernels(download)
if err != nil {
return
}
}
// Get docker kernels
dockerImages, err := listContainerImages()
if err != nil {
return
}
for _, d := range dockerImages {
err = listContainersKernels(d, &newkcfg, download)
if err != nil {
log.Print("gen kernels", d.Name, ":", err)
continue
}
}
stripkcfg := config.KernelConfig{}
for _, nk := range newkcfg.Kernels {
if !hasKernel(nk, stripkcfg) {
stripkcfg.Kernels = append(stripkcfg.Kernels, nk)
}
}
buf, err := toml.Marshal(&stripkcfg)
if err != nil {
return
}
buf = append([]byte("# Autogenerated\n# DO NOT EDIT\n\n"), buf...)
usr, err := user.Current()
if err != nil {
return
}
// TODO move all cfg path values to one provider
kernelsCfgPath := usr.HomeDir + "/.out-of-tree/kernels.toml"
err = ioutil.WriteFile(kernelsCfgPath, buf, 0644)
if err != nil {
return
}
log.Info().Msgf("%s is successfully updated", kernelsCfgPath)
return
}
func listContainersKernels(dii containerImageInfo, newkcfg *config.KernelConfig,
download bool) (err error) {
rootfs, err := genRootfsImage(dii, download)
if err != nil {
return
}
c, err := NewContainer(dii.Name, time.Hour)
if err != nil {
return
}
moddirs, err := ioutil.ReadDir(c.Volumes.LibModules)
if err != nil {
return
}
bootfiles, err := ioutil.ReadDir(c.Volumes.Boot)
if err != nil {
return
}
for _, krel := range moddirs {
log.Debug().Msgf("generate config entry for %s", krel.Name())
var kernelFile, initrdFile string
kernelFile, err = findKernelFile(bootfiles, krel.Name())
if err != nil {
log.Warn().Msgf("cannot find kernel %s", krel.Name())
continue
}
initrdFile, err = findInitrdFile(bootfiles, krel.Name())
if err != nil {
log.Warn().Msgf("cannot find initrd %s", krel.Name())
continue
}
ki := config.KernelInfo{
DistroType: dii.DistroType,
DistroRelease: dii.DistroRelease,
KernelRelease: krel.Name(),
ContainerName: dii.Name,
KernelPath: c.Volumes.Boot + "/" + kernelFile,
InitrdPath: c.Volumes.Boot + "/" + initrdFile,
ModulesPath: c.Volumes.LibModules + "/" + krel.Name(),
RootFS: rootfs,
}
newkcfg.Kernels = append(newkcfg.Kernels, ki)
}
for _, cmd := range []string{
"find /boot -type f -exec chmod a+r {} \\;",
} {
_, err = c.Run(tempDirBase, cmd)
if err != nil {
return
}
}
return
}
func hasKernel(ki config.KernelInfo, kcfg config.KernelConfig) bool {
for _, sk := range kcfg.Kernels {
if sk == ki {
return true
}
}
return false
}
func shuffleStrings(a []string) []string {
// FisherYates shuffle
for i := len(a) - 1; i > 0; i-- {
j := rand.Intn(i + 1)
a[i], a[j] = a[j], a[i]
}
return a
}
func setSigintHandler(variable *bool) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
counter := 0
for _ = range c {
if counter == 0 {
*variable = true
log.Warn().Msg("shutdown requested, finishing work")
log.Info().Msg("^C a couple of times more for an unsafe exit")
} else if counter >= 3 {
log.Fatal().Msg("unsafe exit")
}
counter += 1
}
}()
}
func generateKernels(km config.KernelMask, registry string,
commands []config.DockerCommand, max, retries int64,
download, force, headers, shuffle bool, shutdown *bool) (err error) {
log.Info().Msgf("Generating for kernel mask %v", km)
_, err = genRootfsImage(containerImageInfo{Name: km.DockerName()},
download)
if err != nil || *shutdown {
return
}
err = generateBaseDockerImage(registry, commands, km)
if err != nil || *shutdown {
return
}
var pkgs []string
switch km.DistroType {
case config.Ubuntu:
pkgs, err = matchDebImagePkg(km.DockerName(), km.ReleaseMask)
case config.CentOS:
pkgs, err = matchCentOSDevelPkg(km.DockerName(),
km.ReleaseMask, true)
case config.OracleLinux:
pkgs, err = matchOracleLinuxPkg(km.DockerName(), km.ReleaseMask)
default:
err = fmt.Errorf("%s not yet supported", km.DistroType.String())
}
if err != nil || *shutdown {
return
}
if shuffle {
pkgs = shuffleStrings(pkgs)
}
for i, pkg := range pkgs {
if max <= 0 {
log.Print("Max is reached")
break
}
if *shutdown {
err = nil
return
}
log.Info().Msgf("%d/%d %s", i+1, len(pkgs), pkg)
var attempt int64
for {
attempt++
if *shutdown {
err = nil
return
}
err = installKernel(km, pkg, force, headers)
if err == nil {
max--
break
} else if attempt >= retries {
log.Error().Err(err).Msg("install kernel")
log.Debug().Msg("skip")
break
} else {
log.Warn().Err(err).Msg("install kernel")
time.Sleep(time.Second)
log.Info().Msg("retry")
}
}
}
return
}