83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
// Copyright 2019 Mikhail Klementev. All rights reserved.
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// Use of this source code is governed by a AGPLv3 license
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// (or later) that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"os/exec"
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)
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// inspired by Edd Turtle code
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func downloadFile(filepath string, url string) (err error) {
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out, err := os.Create(filepath)
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if err != nil {
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return
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}
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defer out.Close()
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resp, err := http.Get(url)
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if err != nil {
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return
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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break
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case http.StatusForbidden, http.StatusNotFound:
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err = fmt.Errorf("Cannot download %s. It looks like you need "+
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"to generate it manually and place it "+
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"to ~/.out-of-tree/images/. "+
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"Check documentation for additional information.", url)
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return
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default:
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err = fmt.Errorf("Something weird happens while "+
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"download file: %d", resp.StatusCode)
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return
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}
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_, err = io.Copy(out, resp.Body)
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return
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}
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func unpackTar(archive, destination string) (err error) {
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// NOTE: If you're change anything in tar command please check also
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// BSD tar (or if you're using macOS, do not forget to check GNU Tar)
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// Also make sure that sparse files are extracting correctly
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cmd := exec.Command("tar", "-Sxf", archive)
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cmd.Dir = destination + "/"
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rawOutput, err := cmd.CombinedOutput()
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if err != nil {
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err = fmt.Errorf("%v: %s", err, rawOutput)
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return
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}
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return
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}
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func downloadImage(path, file string) (err error) {
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tmp, err := ioutil.TempDir("/tmp/", "out-of-tree_")
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if err != nil {
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return
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}
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defer os.RemoveAll(tmp)
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archive := tmp + "/" + file + ".tar.gz"
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url := imagesBaseURL + file + ".tar.gz"
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err = downloadFile(archive, url)
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if err != nil {
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return
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}
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err = unpackTar(archive, path)
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return
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}
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