feat(config): use atomic writes for safer configuration writing

- Replaced `fs::write` with `atomicwrites` for atomic file writes, ensuring files are either fully written or not written at all.
- Improved error handling and directory creation logic in `src/config.rs`.
- Bumped package version to `1.1.0`.
- Added `atomicwrites` as a new dependency in `Cargo.toml`.
- Updated Nix build configuration (`default.nix` and `flake.lock`) to reflect new dependencies.

These changes improve the reliability of file operations, preventing partial writes or data corruption in case of failures.

This aligns with what is used by libcosmic applications to write
configurations

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "cosmic-ctl"
 description = "CLI for COSMIC Desktop configuration management"
-version = "1.0.0"
+version = "1.1.0"
 authors = ["Heitor Augusto <IAm.HeitorALN@proton.me>"]
 homepage = "https://github.com/cosmic-utils/cosmic-ctl"
 repository = "https://github.com/cosmic-utils/cosmic-ctl"
@@ -13,6 +13,7 @@ documentation = "https://github.com/cosmic-utils/cosmic-ctl/wiki"
 readme = "README.md"
 
 [dependencies]
+atomicwrites = { git = "https://github.com/jackpot51/rust-atomicwrites" }
 bracoxide = "0.1.4"
 clap = { version = "4.5.21", features = ["derive"] }
 etcetera = "0.8.0"

default.nix

@@ -10,7 +10,7 @@ pkgs.callPackage (
     cosmic-comp,
   }:
   let
-    version = "1.0.0";
+    version = "1.1.0";
   in
   rustPlatform.buildRustPackage {
     pname = "cosmic-ctl";
@@ -21,7 +21,8 @@ pkgs.callPackage (
       path = ./.;
     };
 
-    cargoHash = "sha256-Nrg7NOAUrVQcwBz7nV3hILRYHr1dprQ5VJj2u7Zf3Q0=";
+    useFetchCargoVendor = true;
+    cargoHash = "sha256-EReo2hkBaIO1YOBx4D9rQSXlx+3NK5VQtj59jfZZI/0=";
 
     doInstallCheck = true;
     nativeInstallCheckInputs = [ versionCheckHook ];

src/config.rs

@@ -1,10 +1,11 @@
+use atomicwrites::{AtomicFile, OverwriteBehavior};
 use etcetera::{
     base_strategy::{BaseStrategy, Xdg},
     choose_base_strategy,
 };
 use std::{
     fs,
-    io::{Error, ErrorKind},
+    io::{Error, ErrorKind, Write},
     path::{Path, PathBuf},
 };
 use unescaper::unescape;
@@ -60,18 +61,23 @@ pub fn write_configuration(
         }
     }
 
-    fs::create_dir_all(path.parent().unwrap_or_else(|| Path::new(""))).map_err(|e| {
-        Error::new(
-            ErrorKind::Other,
-            format!("Failed to create directory structure: {}", e),
-        )
-    })?;
-    fs::write(&path, unescaped_value).map_err(|e| {
-        Error::new(
-            ErrorKind::Other,
-            format!("Failed to write configuration to {}: {}", path.display(), e),
-        )
-    })?;
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent).map_err(|e| {
+            Error::new(
+                ErrorKind::Other,
+                format!("Failed to create directory structure: {}", e),
+            )
+        })?;
+    }
+
+    let af = AtomicFile::new(&path, OverwriteBehavior::AllowOverwrite);
+    af.write(|f| f.write_all(unescaped_value.as_bytes()))
+        .map_err(|e| {
+            Error::new(
+                ErrorKind::Other,
+                format!("Failed to write configuration to {}: {}", path.display(), e),
+            )
+        })?;
 
     Ok(true)
 }