Ask before installing macOS upgrades (#433)

src/main.rs

@@ -141,6 +141,8 @@ fn run() -> Result<()> {
     #[cfg(unix)]
     {
         if config.should_run(Step::PackageManagers) {
+            #[cfg(target_os = "macos")]
+            runner.execute("Microsoft AutoUpdate", || macos::run_msupdate(&ctx))?;
             runner.execute("brew", || unix::run_homebrew(&ctx))?;
             #[cfg(target_os = "macos")]
             runner.execute("MacPorts", || macos::run_macports(&ctx))?;
@@ -361,9 +363,8 @@ fn run() -> Result<()> {
     #[cfg(target_os = "macos")]
     {
         if config.should_run(Step::System) {
-            runner.execute("Microsoft AutoUpdate", || macos::run_msupdate(&ctx))?;
             runner.execute("App Store", || macos::run_mas(run_type))?;
-            runner.execute("System upgrade", || macos::upgrade_macos(run_type))?;
+            runner.execute("System upgrade", || macos::upgrade_macos(&ctx))?;
         }
     }
 

src/steps/os/macos.rs

@@ -1,9 +1,13 @@
 use crate::execution_context::ExecutionContext;
 use crate::executor::RunType;
-use crate::terminal::print_separator;
-use crate::utils::{require, PathExt};
+use crate::terminal::{print_separator, prompt_yesno};
+use crate::{
+    error::{SkipStep, TopgradeError},
+    utils::{require, PathExt},
+};
 use anyhow::Result;
-use std::path::Path;
+use log::debug;
+use std::{path::Path, process::Command};
 
 pub fn run_msupdate(ctx: &ExecutionContext) -> Result<()> {
     let msupdate =
@@ -41,11 +45,43 @@ pub fn run_mas(run_type: RunType) -> Result<()> {
     run_type.execute(mas).arg("upgrade").check_run()
 }
 
-pub fn upgrade_macos(run_type: RunType) -> Result<()> {
+pub fn upgrade_macos(ctx: &ExecutionContext) -> Result<()> {
     print_separator("macOS system update");
 
-    run_type
-        .execute("softwareupdate")
-        .args(&["--install", "--all"])
-        .check_run()
+    let should_ask = !(ctx.config().yes()) || (ctx.config().dry_run());
+    if should_ask {
+        println!("Finding available software");
+        if system_update_available()? {
+            let answer = prompt_yesno("A system update is available. Do you wish to install it?")?;
+            if !answer {
+                return Err(SkipStep.into());
+            }
+            println!();
+        } else {
+            println!("No new software available.");
+            return Err(SkipStep.into());
+        }
+    }
+
+    let mut command = ctx.run_type().execute("softwareupdate");
+    command.args(&["--install", "--all"]);
+
+    if should_ask {
+        command.arg("--no-scan");
+    }
+
+    command.check_run()
+}
+
+fn system_update_available() -> Result<bool> {
+    let output = Command::new("softwareupdate").arg("--list").output()?;
+    debug!("{:?}", output);
+
+    let status = output.status;
+    if !status.success() {
+        return Err(TopgradeError::ProcessFailed(status).into());
+    }
+    let string_output = String::from_utf8(output.stderr)?;
+    debug!("{:?}", string_output);
+    Ok(!string_output.contains("No new software available"))
 }

src/terminal.rs

@@ -176,6 +176,23 @@ impl Terminal {
             .ok();
     }
 
+    #[allow(dead_code)]
+    fn prompt_yesno(&mut self, question: &str) -> Result<bool, io::Error> {
+        self.term
+            .write_fmt(format_args!(
+                "{}",
+                style(format!("{} (y)es/(N)o", question,)).yellow().bold()
+            ))
+            .ok();
+
+        loop {
+            match self.term.read_char()? {
+                'y' | 'Y' => break Ok(true),
+                'n' | 'N' | '\r' | '\n' => break Ok(false),
+                _ => (),
+            }
+        }
+    }
     #[allow(unused_variables)]
     fn should_retry(&mut self, interrupted: bool, step_name: &str) -> Result<bool, io::Error> {
         if self.width.is_none() {
@@ -275,3 +292,8 @@ pub fn set_desktop_notifications(desktop_notifications: bool) {
         .unwrap()
         .set_desktop_notifications(desktop_notifications);
 }
+
+#[allow(dead_code)]
+pub fn prompt_yesno(question: &str) -> Result<bool, io::Error> {
+    TERMINAL.lock().unwrap().prompt_yesno(question)
+}