Better way to download and extract server

serv-install.go

@@ -1,35 +1,46 @@
 package main
 
 import (
+	"archive/tar"
 	"fmt"
+	"io"
 	"log"
+	"net/http"
 	"os"
-	"os/exec"
+	"path/filepath"
+
+	"github.com/therootcompany/xz"
 )
 
 func downloadHeadless() {
-	var c = readCfg("config.yml")
+	headlessQuery := fmt.Sprintf("https://www.factorio.com/get-download/latest/headless/linux64")
-	headlessQuery := fmt.Sprintf("https://www.factorio.com/get-download/latest/headless/linux64?username=%s&token=%s", c.Factoryman.UserName, c.Factoryman.ApiToken)
 
-	dlerr := download("./factorio.tar.xz", headlessQuery)
+	url := headlessQuery
-	if dlerr != nil {
+	resp, err := http.Get(url)
-		log.Fatalf("Unable to download: %v", dlerr)
+	if err != nil || resp.StatusCode != http.StatusOK {
+		log.Fatal("Download failed")
 	}
+	defer resp.Body.Close()
 
-	err := os.MkdirAll(c.Server.ServDir, os.ModePerm)
+	// Wrap stream in XZ and Tar readers
-	if err != nil {
+	xzReader, _ := xz.NewReader(resp.Body, 0)
-		fmt.Printf("Error creating directory: %v\n", err)
+	tr := tar.NewReader(xzReader)
-		return
+
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+
+		target := filepath.Join(".", header.Name)
+		switch header.Typeflag {
+		case tar.TypeDir:
+			os.MkdirAll(target, 0755)
+		case tar.TypeReg:
+			os.MkdirAll(filepath.Dir(target), 0755)
+			outFile, _ := os.Create(target)
+			io.Copy(outFile, tr)
+			outFile.Close()
+		}
 	}
-
-	fmt.Println("tar", "-xf", "factorio.tar.xz", "-C", c.Server.ServDir+"/")
-	cmd := exec.Command("tar", "-xf", "factorio.tar.xz", "-C")
-
-	// 2. Run and capture Standard Output
-	out, err := cmd.Output()
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Println(err)
-	fmt.Println(string(out))
 }