feat(cli/mobile/init): skip installing already installed targets, closes

 #7044 (#7058)

Co-authored-by: Lucas Fernandes Nogueira <lucas@tauri.studio>
closes #7044

.changes/cli-skip-targets-install.md

@@ -0,0 +1,6 @@
+---
+'cli.rs': 'patch'
+'cli.js': 'patch'
+---
+
+Skip Rust target installation if they are already installed.

.github/workflows/check-license-header.yml

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-License-Identifier: MIT
 
-name: Check generated files
+name: check license header
 
 on:
   pull_request:

tooling/cli/src/interface/rust.rs

@@ -36,6 +36,7 @@ use tauri_utils::display_path;
 
 mod cargo_config;
 mod desktop;
+pub mod installation;
 pub mod manifest;
 use cargo_config::Config as CargoConfig;
 use manifest::{rewrite_manifest, Manifest};

tooling/cli/src/interface/rust/installation.rs

@@ -0,0 +1,26 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use crate::Result;
+
+use std::{fs::read_dir, path::PathBuf, process::Command};
+
+pub fn installed_targets() -> Result<Vec<String>> {
+  let output = Command::new("rustc")
+    .args(["--print", "sysroot"])
+    .output()?;
+  let sysroot_path = PathBuf::from(String::from_utf8_lossy(&output.stdout).trim().to_string());
+
+  let mut targets = Vec::new();
+  for entry in read_dir(sysroot_path.join("lib").join("rustlib"))?.flatten() {
+    if entry.file_type().map(|t| t.is_dir()).unwrap_or_default() {
+      let name = entry.file_name();
+      if name != "etc" && name != "src" {
+        targets.push(name.to_string_lossy().into_owned());
+      }
+    }
+  }
+
+  Ok(targets)
+}

tooling/cli/src/mobile/android/project.rs

@@ -35,8 +35,22 @@ pub fn gen(
   (handlebars, mut map): (Handlebars, template::JsonMap),
   wrapper: &TextWrapper,
 ) -> Result<()> {
-  println!("Installing Android toolchains...");
-  Target::install_all().with_context(|| "failed to run rustup")?;
+  let installed_targets =
+    crate::interface::rust::installation::installed_targets().unwrap_or_default();
+  let missing_targets = Target::all()
+    .values()
+    .filter(|t| !installed_targets.contains(&t.triple().into()))
+    .collect::<Vec<&Target>>();
+
+  if !missing_targets.is_empty() {
+    println!("Installing Android Rust toolchains...");
+    for target in missing_targets {
+      target
+        .install()
+        .context("failed to install target with rustup")?;
+    }
+  }
+
   println!("Generating Android Studio project...");
   let dest = config.project_dir();
   let asset_packs = metadata.asset_packs().unwrap_or_default();

tooling/cli/src/mobile/ios/project.rs

@@ -34,8 +34,22 @@ pub fn gen(
   non_interactive: bool,
   reinstall_deps: bool,
 ) -> Result<()> {
-  println!("Installing iOS toolchains...");
-  Target::install_all()?;
+  let installed_targets =
+    crate::interface::rust::installation::installed_targets().unwrap_or_default();
+  let missing_targets = Target::all()
+    .values()
+    .filter(|t| !installed_targets.contains(&t.triple().into()))
+    .collect::<Vec<&Target>>();
+
+  if !missing_targets.is_empty() {
+    println!("Installing iOS Rust toolchains...");
+    for target in missing_targets {
+      target
+        .install()
+        .context("failed to install target with rustup")?;
+    }
+  }
+
   rust_version_check(wrapper)?;
 
   deps::install_all(wrapper, non_interactive, true, reinstall_deps)