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out-of-tree/container/container.go

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// 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 container
import (
"bufio"
"errors"
"fmt"
"os"
"os/exec"
"os/user"
"path"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"code.dumpstack.io/tools/out-of-tree/config"
)
var Runtime = "docker"
type Image struct {
Name string
DistroType config.DistroType
DistroRelease string // 18.04/7/9
}
func Images() (diis []Image, err error) {
cmd := exec.Command(Runtime, "images")
log.Debug().Msgf("%v", cmd)
rawOutput, err := cmd.CombinedOutput()
if err != nil {
return
}
r, err := regexp.Compile("out_of_tree_.*")
if err != nil {
return
}
containers := r.FindAll(rawOutput, -1)
for _, c := range containers {
containerName := strings.Fields(string(c))[0]
s := strings.Replace(containerName, "__", ".", -1)
values := strings.Split(s, "_")
distro, ver := values[3], values[4]
dii := Image{
Name: containerName,
DistroRelease: ver,
}
dii.DistroType, err = config.NewDistroType(distro)
if err != nil {
return
}
diis = append(diis, dii)
}
return
}
func ImagePath(sk config.KernelMask) string {
return config.Dir("containers", sk.DistroType.String(), sk.DistroRelease)
}
type Volumes struct {
LibModules string
UsrSrc string
Boot string
}
type Container struct {
name string
timeout time.Duration
Volumes Volumes
// Additional arguments
Args []string
Log zerolog.Logger
}
func New(name string, timeout time.Duration) (c Container, err error) {
c.Log = log.With().
Str("container", name).
Logger()
c.name = name
c.timeout = timeout
usr, err := user.Current()
if err != nil {
return
}
c.Volumes.LibModules = fmt.Sprintf(
"%s/.out-of-tree/volumes/%s/lib/modules", usr.HomeDir, name)
os.MkdirAll(c.Volumes.LibModules, 0777)
c.Volumes.UsrSrc = fmt.Sprintf(
"%s/.out-of-tree/volumes/%s/usr/src", usr.HomeDir, name)
os.MkdirAll(c.Volumes.UsrSrc, 0777)
c.Volumes.Boot = fmt.Sprintf(
"%s/.out-of-tree/volumes/%s/boot", usr.HomeDir, name)
os.MkdirAll(c.Volumes.Boot, 0777)
return
}
func NewFromKernelInfo(ki config.KernelInfo, timeout time.Duration) (
c Container, err error) {
c.name = ki.ContainerName
c.timeout = timeout
c.Log = log.With().
Str("container", c.name).
Logger()
c.Volumes.LibModules = path.Dir(ki.ModulesPath)
c.Volumes.Boot = path.Dir(ki.KernelPath)
c.Volumes.UsrSrc = filepath.Join(path.Dir(ki.KernelPath), "../usr/src")
return
}
func (c Container) Build(imagePath string) (output string, err error) {
args := []string{"build"}
args = append(args, "-t", c.name, imagePath)
cmd := exec.Command(Runtime, args...)
flog := c.Log.With().
Str("command", fmt.Sprintf("%v", cmd)).
Logger()
stdout, err := cmd.StdoutPipe()
if err != nil {
return
}
cmd.Stderr = cmd.Stdout
err = cmd.Start()
if err != nil {
return
}
go func() {
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
m := scanner.Text()
output += m + "\n"
flog.Trace().Str("stdout", m).Msg("")
}
}()
err = cmd.Wait()
return
}
func (c Container) Run(workdir string, command string) (output string, err error) {
flog := c.Log.With().
Str("workdir", workdir).
Str("command", command).
Logger()
var args []string
args = append(args, "run", "--rm")
args = append(args, c.Args...)
if workdir != "" {
args = append(args, "-v", workdir+":/work")
}
if c.Volumes.LibModules != "" {
args = append(args, "-v", c.Volumes.LibModules+":/lib/modules")
}
if c.Volumes.UsrSrc != "" {
args = append(args, "-v", c.Volumes.UsrSrc+":/usr/src")
}
if c.Volumes.Boot != "" {
args = append(args, "-v", c.Volumes.Boot+":/boot")
}
args = append(args, c.name, "bash", "-c")
if workdir != "" {
args = append(args, "cd /work && "+command)
} else {
args = append(args, command)
}
cmd := exec.Command(Runtime, args...)
flog.Debug().Msgf("%v", cmd)
stdout, err := cmd.StdoutPipe()
if err != nil {
return
}
cmd.Stderr = cmd.Stdout
timer := time.AfterFunc(c.timeout, func() {
flog.Info().Msg("killing container by timeout")
flog.Debug().Msg("SIGINT")
cmd.Process.Signal(os.Interrupt)
time.Sleep(time.Minute)
flog.Debug().Msg("SIGKILL")
cmd.Process.Kill()
})
defer timer.Stop()
err = cmd.Start()
if err != nil {
return
}
go func() {
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
m := scanner.Text()
output += m + "\n"
flog.Trace().Str("stdout", m).Msg("")
}
}()
err = cmd.Wait()
if err != nil {
e := fmt.Sprintf("error `%v` for cmd `%v` with output `%v`",
err, command, output)
err = errors.New(e)
return
}
return
}