From 09909212654f1a362bf6457477e57ddd7e0bbb0e Mon Sep 17 00:00:00 2001
From: Lucas Nogueira <lucas@tauri.app>
Date: Sat, 20 Jan 2024 09:00:55 -0300
Subject: [PATCH] optimize build scripts [skip ci]

---
 core/tauri-build/src/lib.rs       | 10 ++++++----
 core/tauri-utils/src/acl/build.rs |  9 ++++++---
 core/tauri/build.rs               |  7 +++++--
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/core/tauri-build/src/lib.rs b/core/tauri-build/src/lib.rs
index 227761d3c1c0..5aab858b5f4c 100644
--- a/core/tauri-build/src/lib.rs
+++ b/core/tauri-build/src/lib.rs
@@ -25,6 +25,7 @@ use tauri_utils::{
 
 use std::{
   env::var_os,
+  fs::read_to_string,
   path::{Path, PathBuf},
 };
 
@@ -484,10 +485,11 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
   acl::validate_capabilities(&plugin_manifests, &capabilities)?;
 
-  std::fs::write(
-    out_dir.join(CAPABILITIES_FILE_NAME),
-    serde_json::to_string(&capabilities)?,
-  )?;
+  let capabilities_path = out_dir.join(CAPABILITIES_FILE_NAME);
+  let capabilities_json = serde_json::to_string(&capabilities)?;
+  if capabilities_json != read_to_string(&capabilities_path).unwrap_or_default() {
+    std::fs::write(capabilities_path, capabilities_json)?;
+  }
 
   println!("cargo:rustc-env=TAURI_ENV_TARGET_TRIPLE={target_triple}");
 
diff --git a/core/tauri-utils/src/acl/build.rs b/core/tauri-utils/src/acl/build.rs
index 5e4e854cd26a..9f001c29b34a 100644
--- a/core/tauri-utils/src/acl/build.rs
+++ b/core/tauri-utils/src/acl/build.rs
@@ -7,7 +7,7 @@
 use std::{
   collections::{BTreeMap, HashMap},
   env::{current_dir, vars_os},
-  fs::{create_dir_all, File},
+  fs::{create_dir_all, read_to_string, File},
   io::{BufWriter, Write},
   path::{Path, PathBuf},
 };
@@ -309,7 +309,10 @@ commands.deny = ["{command}"]
       schema_path = schema_path.display().to_string().replace('\\', "\\\\")
     );
 
-    std::fs::write(path.join(format!("{command}.toml")), toml)
-      .unwrap_or_else(|_| panic!("unable to autogenerate ${command}.toml"));
+    let out_path = path.join(format!("{command}.toml"));
+    if toml != read_to_string(&out_path).unwrap_or_default() {
+      std::fs::write(out_path, toml)
+        .unwrap_or_else(|_| panic!("unable to autogenerate ${command}.toml"));
+    }
   }
 }
diff --git a/core/tauri/build.rs b/core/tauri/build.rs
index 5739c88f5d71..e944be71b76f 100644
--- a/core/tauri/build.rs
+++ b/core/tauri/build.rs
@@ -312,8 +312,11 @@ permissions = [{default_permissions}]
 "###,
     );
 
-    std::fs::write(autogenerated.join("default.toml"), default_toml)
-      .unwrap_or_else(|_| panic!("unable to autogenerate default permissions"));
+    let out_path = autogenerated.join("default.toml");
+    if default_toml != read_to_string(&out_path).unwrap_or_default() {
+      std::fs::write(out_path, default_toml)
+        .unwrap_or_else(|_| panic!("unable to autogenerate default permissions"));
+    }
 
     let permissions = tauri_utils::acl::build::define_permissions(
       &format!("./permissions/{plugin}/**/*.toml"),