add compress_file

src/main.rs

@@ -131,7 +131,7 @@ fn process_config_item(options: &Options, config_item: &OSSBackupdConfigItem,
 
     #[cfg(not(feature = "use_zip"))]
     let zip_file = || {
-        if let Err(e) = zip_util::zip_file(target, temp_zip_file) {
+        if let Err(e) = zip_util::compress_file(target, temp_zip_file) {
             print_message(MessageType::ERROR, &format!("Error in zip file: {}, at item index: {}", e, item_index));
             return false;
         };

src/zip_util.rs

@@ -9,6 +9,10 @@ use zip::{
     CompressionMethod,
     write::{ ZipWriter, FileOptions, },
 };
+use flate2:: {
+    Compression,
+    write::GzEncoder,
+};
 use rust_util::{
     XResult,
     new_box_ioerror,
@@ -17,6 +21,22 @@ use rust_util::{
     util_file::*,
 };
 
+pub fn compress_file(target: &str, compress_file: &str) -> XResult<()> {
+    match target {
+        target_zip if target_zip.ends_with(".zip") => zip_file(target, compress_file),
+        target_tar if target_tar.ends_with(".tar.gz") => tar_file(target, compress_file),
+        target => Err(new_box_ioerror(&format!("Unknown target type: {}", target))),
+    }
+}
+
+pub fn tar_file(target: &str, tar_file: &str) -> XResult<()> {
+    let target_tar_gz = File::create(target)?;
+    let enc = GzEncoder::new(target_tar_gz, Compression::default());
+    let mut tar = tar::Builder::new(enc);
+    tar.append_path(tar_file)?;
+    Ok(())
+}
+
 // http://mvdnes.github.io/rust-docs/zip-rs/zip/index.html
 pub fn zip_file(target: &str, zip_file: &str) -> XResult<()> {
     if Path::new(zip_file).exists() {