Dry run (fixes #22)

src/macos.rs

@@ -1,14 +1,14 @@
+use super::executor::Executor;
 use super::terminal::Terminal;
 use super::utils::Check;
 use failure;
-use std::process::Command;
 
 #[must_use]
-pub fn upgrade_macos(terminal: &mut Terminal) -> Option<(&'static str, bool)> {
+pub fn upgrade_macos(terminal: &mut Terminal, dry_run: bool) -> Option<(&'static str, bool)> {
     terminal.print_separator("App Store");
 
     let success = || -> Result<(), failure::Error> {
-        Command::new("softwareupdate")
+        Executor::new("softwareupdate", dry_run)
             .args(&["--install", "--all"])
             .spawn()?
             .wait()?