/
os.go
69 lines (57 loc) · 1.37 KB
/
os.go
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package utils
import (
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"strconv"
"strings"
)
func GetLatestOSVersion() (string, error) {
resp, err := http.Get("https://api.github.com/repos/nlf/dhyve-os/releases/latest")
if err != nil {
return "", err
}
defer resp.Body.Close()
var latest struct {
Tag string `json:"tag_name"`
}
decoder := json.NewDecoder(resp.Body)
err = decoder.Decode(&latest)
if err != nil {
return "", err
}
return latest.Tag, nil
}
func DownloadOS(version string) error {
if !strings.HasPrefix(version, "v") {
version = "v" + version
}
files := []string{"bzImage", "rootfs.cpio.xz"}
for _, file := range files {
path := os.ExpandEnv("$HOME/.dlite/" + file)
output, err := os.Create(path)
if err != nil {
return err
}
defer output.Close()
url := "https://github.com/nlf/dhyve-os/releases/download/" + version + "/" + file
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
contentLength, err := strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64)
if err != nil {
return fmt.Errorf("Unable to get Content-Length of '%s': %s", url, err.Error())
}
if _, err := io.CopyN(output, resp.Body, contentLength); err != nil {
return fmt.Errorf("Unable to download '%s': %s", url, err.Error())
}
if err := changePermissions(path); err != nil {
return err
}
}
return nil
}