refactor: move kernel functions to submodule

images.go

@@ -1,4 +1,4 @@
-// Copyright 2019 Mikhail Klementev. All rights reserved.
+// 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.
 
@@ -7,17 +7,11 @@ package main
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
-	"net/url"
 	"os"
-	"os/exec"
 	"os/user"
 	"strings"
 	"time"
 
-	"github.com/cavaliergopher/grab/v3"
-	"github.com/rs/zerolog/log"
-
 	"code.dumpstack.io/tools/out-of-tree/config"
 	"code.dumpstack.io/tools/out-of-tree/fs"
 	"code.dumpstack.io/tools/out-of-tree/qemu"
@@ -126,47 +120,3 @@ func (cmd *ImageEditCmd) Run(g *Globals) (err error) {
 	}
 	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 + "/"
-
-	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(tempDirBase, "out-of-tree_")
-	if err != nil {
-		return
-	}
-	defer os.RemoveAll(tmp)
-
-	fileurl, err := url.JoinPath(imagesBaseURL, file+".tar.gz")
-	if err != nil {
-		return
-	}
-
-	resp, err := grab.Get(tmp, fileurl)
-	if err != nil {
-		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.",
-			fileurl)
-		return
-	}
-
-	err = unpackTar(resp.Filename, path)
-	return
-}