Move archive functions into utils package

utils/archive.go

@@ -0,0 +1,111 @@
+package utils
+
+import (
+	"archive/tar"
+	"archive/zip"
+	"compress/gzip"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+// UnzipFile extracts a zip file to the specified destination
+func UnzipFile(zipFile, dest string) error {
+	r, err := zip.OpenReader(zipFile)
+	if err != nil {
+		return err
+	}
+	defer r.Close()
+
+	for _, f := range r.File {
+		fPath := filepath.Join(dest, f.Name)
+		if f.FileInfo().IsDir() {
+			if err := os.MkdirAll(fPath, os.ModePerm); err != nil {
+				return err
+			}
+			continue
+		}
+
+		if err := os.MkdirAll(filepath.Dir(fPath), os.ModePerm); err != nil {
+			return err
+		}
+
+		outFile, err := os.OpenFile(fPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+		if err != nil {
+			return err
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			outFile.Close()
+			return err
+		}
+
+		_, err = io.Copy(outFile, rc)
+
+		outFile.Close()
+		rc.Close()
+
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// UntarGz extracts a tar.gz file to the specified destination.
+func UntarGz(tarGzFile, dest string) error {
+	file, err := os.Open(tarGzFile)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	gzr, err := gzip.NewReader(file)
+	if err != nil {
+		return err
+	}
+	defer gzr.Close()
+
+	return Untar(gzr, dest)
+}
+
+// Untar extracts a tar archive to the specified destination.
+func Untar(r io.Reader, dest string) error {
+	tr := tar.NewReader(r)
+
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		fPath := filepath.Join(dest, header.Name)
+		if header.Typeflag == tar.TypeDir {
+			if err := os.MkdirAll(fPath, os.ModePerm); err != nil {
+				return err
+			}
+		} else {
+			if err := os.MkdirAll(filepath.Dir(fPath), os.ModePerm); err != nil {
+				return err
+			}
+
+			outFile, err := os.OpenFile(fPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(header.Mode))
+			if err != nil {
+				return err
+			}
+
+			if _, err := io.Copy(outFile, tr); err != nil {
+				outFile.Close()
+				return err
+			}
+
+			outFile.Close()
+		}
+	}
+
+	return nil
+}