Fix updater permissions and refactor existing code.

util/src/path.rs

@@ -86,18 +86,15 @@ pub mod ethereum {
 }
 
 /// Restricts the permissions of given path only to the owner.
-#[cfg(not(windows))]
-pub fn restrict_permissions_owner(file_path: &Path) -> Result<(), i32>  {
-	let cstr = ::std::ffi::CString::new(file_path.to_str().unwrap()).unwrap();
-	match unsafe { ::libc::chmod(cstr.as_ptr(), ::libc::S_IWUSR | ::libc::S_IRUSR) } {
-		0 => Ok(()),
-		x => Err(x),
-	}
+#[cfg(unix)]
+pub fn restrict_permissions_owner(file_path: &Path, write: bool, executable: bool) -> Result<(), String>  {
+	let perms = ::std::os::unix::fs::PermissionsExt::from_mode(0o400 + write as u32 * 0o200 + executable as u32 * 0o100);
+	::std::fs::set_permissions(file_path, perms).map_err(|e| format!("{:?}", e))
 }
 
 /// Restricts the permissions of given path only to the owner.
-#[cfg(windows)]
-pub fn restrict_permissions_owner(_file_path: &Path) -> Result<(), i32>  {
+#[cfg(not(unix))]
+pub fn restrict_permissions_owner(_file_path: &Path) -> Result<(), String>  {
 	//TODO: implement me
 	Ok(())
 }