new: added log rotation (closes #374)

vendor/github.com/evilsocket/islazy/zip/files.go

@@ -0,0 +1,55 @@
+package zip
+
+import (
+	"archive/zip"
+	"io"
+	"os"
+)
+
+// Files compresses one or many files into a single zip archive file.
+// Credits: https://golangcode.com/create-zip-files-in-go/
+func Files(filename string, files []string) error {
+	arc, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer arc.Close()
+
+	writer := zip.NewWriter(arc)
+	defer writer.Close()
+
+	for _, file := range files {
+		in, err := os.Open(file)
+		if err != nil {
+			return err
+		}
+		defer in.Close()
+
+		info, err := in.Stat()
+		if err != nil {
+			return err
+		}
+
+		header, err := zip.FileInfoHeader(info)
+		if err != nil {
+			return err
+		}
+
+		// Using FileInfoHeader() above only uses the basename of the file. If we want
+		// to preserve the folder structure we can overwrite this with the full path.
+		header.Name = file
+		// Change to deflate to gain better compression
+		// see http://golang.org/pkg/archive/zip/#pkg-constants
+		header.Method = zip.Deflate
+
+		w, err := writer.CreateHeader(header)
+		if err != nil {
+			return err
+		}
+		if _, err = io.Copy(w, in); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}