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out-of-tree/images.go

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// Copyright 2019 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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"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
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"os/user"
"time"
"code.dumpstack.io/tools/out-of-tree/config"
"code.dumpstack.io/tools/out-of-tree/qemu"
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"github.com/rs/zerolog/log"
)
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type ImageCmd struct {
List ImageListCmd `cmd:"" help:"list images"`
Edit ImageEditCmd `cmd:"" help:"edit image"`
}
type ImageListCmd struct{}
func (cmd *ImageListCmd) Run(g *Globals) (err error) {
usr, err := user.Current()
if err != nil {
return
}
entries, err := os.ReadDir(usr.HomeDir + "/.out-of-tree/images/")
if err != nil {
return
}
for _, e := range entries {
fmt.Println(e.Name())
}
return
}
type ImageEditCmd struct {
Name string `help:"image name" required:""`
}
func (cmd *ImageEditCmd) Run(g *Globals) (err error) {
usr, err := user.Current()
if err != nil {
return
}
image := usr.HomeDir + "/.out-of-tree/images/" + cmd.Name
if !exists(image) {
fmt.Println("image does not exist")
}
kcfg, err := config.ReadKernelConfig(g.Config.Kernels)
if err != nil {
return
}
if len(kcfg.Kernels) == 0 {
return errors.New("No kernels found")
}
ki := config.KernelInfo{}
for _, k := range kcfg.Kernels {
if k.RootFS == image {
ki = k
break
}
}
kernel := qemu.Kernel{
KernelPath: ki.KernelPath,
InitrdPath: ki.InitrdPath,
}
q, err := qemu.NewSystem(qemu.X86x64, kernel, ki.RootFS)
q.Mutable = true
err = q.Start()
if err != nil {
fmt.Println("Qemu start error:", err)
return
}
defer q.Stop()
fmt.Print("ssh command:\n\n\t")
fmt.Println(q.GetSSHCommand())
fmt.Print("\npress enter to stop")
fmt.Scanln()
q.Command("root", "poweroff")
for !q.Died {
time.Sleep(time.Second)
}
return
}
// inspired by Edd Turtle code
func downloadFile(filepath string, url string) (err error) {
out, err := os.Create(filepath)
if err != nil {
return
}
defer out.Close()
resp, err := http.Get(url)
if err != nil {
return
}
defer resp.Body.Close()
switch resp.StatusCode {
case http.StatusOK:
break
case http.StatusForbidden, http.StatusNotFound:
err = fmt.Errorf("Cannot download %s. It looks like you need "+
"to generate it manually and place it "+
"to ~/.out-of-tree/images/. "+
"Check documentation for additional information.", url)
return
default:
err = fmt.Errorf("Something weird happens while "+
"download file: %d", resp.StatusCode)
return
}
_, err = io.Copy(out, resp.Body)
return
}
func unpackTar(archive, destination string) (err error) {
// NOTE: If you're change anything in tar command please check also
// BSD tar (or if you're using macOS, do not forget to check GNU Tar)
// Also make sure that sparse files are extracting correctly
cmd := exec.Command("tar", "-Sxf", archive)
cmd.Dir = destination + "/"
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log.Debug().Msgf("%v", cmd)
rawOutput, err := cmd.CombinedOutput()
if err != nil {
err = fmt.Errorf("%v: %s", err, rawOutput)
return
}
return
}
func downloadImage(path, file string) (err error) {
tmp, err := ioutil.TempDir("/tmp/", "out-of-tree_")
if err != nil {
return
}
defer os.RemoveAll(tmp)
archive := tmp + "/" + file + ".tar.gz"
url := imagesBaseURL + file + ".tar.gz"
err = downloadFile(archive, url)
if err != nil {
return
}
err = unpackTar(archive, path)
return
}