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out-of-tree/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 main
import (
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"bufio"
"errors"
"fmt"
"os"
"os/exec"
"os/user"
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"regexp"
"strings"
"time"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
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"code.dumpstack.io/tools/out-of-tree/config"
)
var containerRuntime = "docker"
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type ContainerCmd struct {
Filter string `help:"filter by name"`
List ContainerListCmd `cmd:"" help:"list containers"`
Cleanup ContainerCleanupCmd `cmd:"" help:"cleanup containers"`
}
func (cmd ContainerCmd) Containers() (names []string) {
images, err := listContainerImages()
if err != nil {
log.Fatal().Err(err).Msg("")
}
for _, img := range images {
if cmd.Filter != "" && !strings.Contains(img.Name, cmd.Filter) {
continue
}
names = append(names, img.Name)
}
return
}
type ContainerListCmd struct{}
func (cmd ContainerListCmd) Run(containerCmd *ContainerCmd) (err error) {
for _, name := range containerCmd.Containers() {
fmt.Println(name)
}
return
}
type ContainerCleanupCmd struct{}
func (cmd ContainerCleanupCmd) Run(containerCmd *ContainerCmd) (err error) {
var output []byte
for _, name := range containerCmd.Containers() {
output, err = exec.Command(containerRuntime, "image", "rm", name).
CombinedOutput()
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if err != nil {
log.Error().Err(err).Str("output", string(output)).Msg("")
return
}
}
return
}
type containerImageInfo struct {
Name string
DistroType config.DistroType
DistroRelease string // 18.04/7.4.1708/9.1
}
func listContainerImages() (diis []containerImageInfo, err error) {
cmd := exec.Command(containerRuntime, "images")
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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 {
container := strings.Fields(string(c))[0]
s := strings.Replace(container, "__", ".", -1)
values := strings.Split(s, "_")
distro, ver := values[3], values[4]
dii := containerImageInfo{
Name: container,
DistroRelease: ver,
}
dii.DistroType, err = config.NewDistroType(distro)
if err != nil {
return
}
diis = append(diis, dii)
}
return
}
type container struct {
name string
timeout time.Duration
Volumes struct {
LibModules string
UsrSrc string
Boot string
}
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// Additional arguments
Args []string
Log zerolog.Logger
}
func NewContainer(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 (c container) Build(imagePath string) (output string, err error) {
args := []string{"build"}
args = append(args, "-t", c.name, imagePath)
cmd := exec.Command(containerRuntime, args...)
flog := c.Log.With().
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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().
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Str("workdir", workdir).
Str("command", command).
Logger()
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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")
}
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args = append(args, c.name, "bash", "-c")
if workdir != "" {
args = append(args, "cd /work && "+command)
} else {
args = append(args, command)
}
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cmd := exec.Command(containerRuntime, args...)
flog.Debug().Msgf("%v", cmd)
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stdout, err := cmd.StdoutPipe()
if err != nil {
return
}
cmd.Stderr = cmd.Stdout
timer := time.AfterFunc(c.timeout, func() {
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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()
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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`",
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err, command, output)
err = errors.New(e)
return
}
return
}