replace the tar xzf command by gzip package functions

command/commands.go

@@ -72,12 +72,3 @@ func AnsiblePlaybook(vmName, ip string, playbook string) *cmd {
 		},
 	}
 }
-
-// Tar flags are (cxzf)
-// Temporary, use go code instead
-func Tar(args ...string) *cmd {
-	return &cmd{
-		command: "tar",
-		args:    args,
-	}
-}

vagrant/archive.go

@@ -2,6 +2,8 @@ package vagrant
 
 import (
 	"archive/tar"
+	"compress/gzip"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
@@ -36,3 +38,47 @@ func tarFiles(w io.Writer, base string, files []os.FileInfo) error {
 
 	return nil
 }
+
+func gunzip(baseDir string, gzipStream io.Reader) error {
+
+	uncompressedStream, err := gzip.NewReader(gzipStream)
+	if err != nil {
+		return err
+	}
+
+	tarReader := tar.NewReader(uncompressedStream)
+
+	for true {
+		header, err := tarReader.Next()
+
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			return err
+		}
+
+		switch header.Typeflag {
+		case tar.TypeDir:
+			if err := os.Mkdir(filepath.Join(baseDir, header.Name), 0755); err != nil {
+				return err
+			}
+		case tar.TypeReg:
+			outFile, err := os.Create(filepath.Join(baseDir, header.Name))
+			if err != nil {
+				return err
+			}
+			defer outFile.Close()
+			if _, err := io.Copy(outFile, tarReader); err != nil {
+				return err
+			}
+
+		default:
+			return fmt.Errorf("ExtractTarGz: uknown type: %s in %s", header.Typeflag, header.Name)
+		}
+
+	}
+
+	return nil
+}

vagrant/image.go

@@ -1,7 +1,6 @@
 package vagrant
 
 import (
-	"github.com/mhewedy/vermin/command"
 	"io/ioutil"
 	"os"
 	"path"
@@ -41,8 +40,14 @@ func ProcessImage(imagePath string) error {
 }
 
 func gunzipVagrantBox(imagePath, imageDir string) error {
-	// TODO change from using tar command to golang code
-	return command.Tar("xzf", imagePath, "-C", imageDir).Run()
+
+	gzipFile, err := os.Open(imagePath)
+	if err != nil {
+		return err
+	}
+	defer gzipFile.Close()
+
+	return gunzip(imageDir, gzipFile)
 }
 
 func createOVAFile(imagePath, imageDir string) error {