Fix clippy

.github/workflows/ci.yml

@@ -95,19 +95,3 @@ jobs:
         run: pack build my-image --force-color --builder heroku/builder:24 --trust-extra-buildpacks --buildpack heroku/nodejs-engine --buildpack packaged/${{ matrix.target }}/debug/heroku_ruby --path tmp/ruby-getting-started --pull-policy never
       - name: "PRINT: Cached getting started guide output"
         run: pack build my-image --force-color --builder heroku/builder:24 --trust-extra-buildpacks --buildpack heroku/nodejs-engine --buildpack packaged/${{ matrix.target }}/debug/heroku_ruby --path tmp/ruby-getting-started --pull-policy never
-
-  print-style-guide:
-    runs-on: ubuntu-24.04
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Install musl-tools
-        run: sudo apt-get install musl-tools --no-install-recommends
-      - name: Update Rust toolchain
-        run: rustup update
-      - name: Install Rust linux-musl target
-        run: rustup target add x86_64-unknown-linux-musl
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2.7.3
-      - name: "PRINT: Style guide"
-        run: cargo run --quiet --bin print_style_guide

buildpacks/ruby/src/layers/ruby_install_layer.rs

@@ -10,8 +10,7 @@ use flate2::read::GzDecoder;
 use libcnb::build::BuildContext;
 use libcnb::data::layer_name;
 use libcnb::layer::{
-    CachedLayerDefinition, EmptyLayerCause, IntoAction, InvalidMetadataAction, LayerState,
-    RestoredLayerAction,
+    CachedLayerDefinition, EmptyLayerCause, IntoAction, LayerState, RestoredLayerAction,
 };
 use libcnb::layer_env::LayerEnv;
 use magic_migrate::{try_migrate_deserializer_chain, TryMigrate};

buildpacks/ruby/src/main.rs

@@ -299,9 +299,6 @@ buildpack_main!(RubyBuildpack);
 struct BundleWithout(String);
 
 impl BundleWithout {
-    fn new(without: impl AsRef<str>) -> Self {
-        Self(String::from(without.as_ref()))
-    }
     fn as_str(&self) -> &str {
         &self.0
     }

buildpacks/ruby/src/steps/default_env.rs

@@ -1,5 +1,6 @@
 use crate::{RubyBuildpack, RubyBuildpackError};
-use commons::layer::DefaultEnvLayer;
+use libcnb::layer::UncachedLayerDefinition;
+use libcnb::layer_env::{LayerEnv, ModificationBehavior};
 use libcnb::{
     build::BuildContext,
     data::{layer_name, store::Store},
@@ -23,25 +24,32 @@ pub(crate) fn default_env(
     }
 
     let (default_secret_key_base, store) = fetch_secret_key_base_from_store(&context.store);
+    let env_defaults_layer = context.uncached_layer(
+        layer_name!("env_default"),
+        UncachedLayerDefinition {
+            build: true,
+            launch: true,
+        },
+    )?;
 
-    let env_defaults_layer = context //
-        .handle_layer(
-            layer_name!("env_defaults"),
-            DefaultEnvLayer::new(
-                [
-                    ("SECRET_KEY_BASE", default_secret_key_base.as_str()),
-                    ("JRUBY_OPTS", "-Xcompile.invokedynamic=false"),
-                    ("RACK_ENV", "production"),
-                    ("RAILS_ENV", "production"),
-                    ("RAILS_SERVE_STATIC_FILES", "enabled"),
-                    ("RAILS_LOG_TO_STDOUT", "enabled"),
-                    ("MALLOC_ARENA_MAX", "2"),
-                    ("DISABLE_SPRING", "1"),
-                ]
-                .into_iter(),
-            ),
-        )?;
-    env = env_defaults_layer.env.apply(Scope::Build, &env);
+    let mut layer_env = LayerEnv::new();
+    for (key, value) in [
+        ("SECRET_KEY_BASE", default_secret_key_base.as_str()),
+        ("JRUBY_OPTS", "-Xcompile.invokedynamic=false"),
+        ("RACK_ENV", "production"),
+        ("RAILS_ENV", "production"),
+        ("RAILS_SERVE_STATIC_FILES", "enabled"),
+        ("RAILS_LOG_TO_STDOUT", "enabled"),
+        ("MALLOC_ARENA_MAX", "2"),
+        ("DISABLE_SPRING", "1"),
+    ] {
+        layer_env =
+            layer_env.chainable_insert(Scope::All, ModificationBehavior::Default, key, value);
+    }
+
+    env_defaults_layer.write_env(&layer_env)?;
+
+    let env = env_defaults_layer.read_env()?.apply(Scope::Build, &env);
 
     Ok((env, store))
 }

buildpacks/ruby/src/user_errors.rs

@@ -360,7 +360,7 @@ fn debug_cmd(mut bullet: Print<SubBullet<Stdout>>, command: &mut Command) -> Pri
 
     match result {
         Ok(_) => bullet.done(),
-        Err(e) => bullet.sub_bullet(&e.to_string()).done(),
+        Err(e) => bullet.sub_bullet(e.to_string()).done(),
     }
 }
 

commons/Cargo.toml

@@ -4,10 +4,6 @@ edition.workspace = true
 rust-version.workspace = true
 version = "1.1.0"
 
-[[bin]]
-name = "print_style_guide"
-path = "bin/print_style_guide.rs"
-
 [lints]
 workspace = true
 

commons/src/cache.rs

@@ -6,6 +6,8 @@ mod error;
 
 pub use self::app_cache::{build, PathState};
 pub use self::app_cache::{AppCache, CacheState};
+
+#[allow(deprecated)]
 pub use self::app_cache_collection::AppCacheCollection;
 pub use self::clean::FilesWithSize;
 pub use self::config::CacheConfig;

commons/src/cache/app_cache_collection.rs

@@ -20,6 +20,7 @@ pub struct AppCacheCollection<'a> {
     collection: Vec<AppCache>,
 }
 
+#[allow(deprecated)]
 impl<'a> AppCacheCollection<'a> {
     /// Store multiple application paths in the cache
     ///
@@ -36,15 +37,14 @@ impl<'a> AppCacheCollection<'a> {
         let caches = config
             .into_iter()
             .map(|config| {
-                AppCache::new_and_load(context, config).map(|store| {
+                AppCache::new_and_load(context, config).inspect(|store| {
                     let path = store.path().display();
 
                     log::log_step(match store.cache_state() {
                         CacheState::NewEmpty => format!("Creating cache for {path}"),
                         CacheState::ExistsEmpty => format!("Loading (empty) cache for {path}"),
                         CacheState::ExistsWithContents => format!("Loading cache for {path}"),
                     });
-                    store
                 })
             })
             .collect::<Result<Vec<AppCache>, CacheError>>()?;

commons/src/layer.rs

@@ -3,7 +3,9 @@ mod default_env_layer;
 
 use libcnb::layer::{IntoAction, InvalidMetadataAction};
 
+#[allow(deprecated)]
 pub use self::configure_env_layer::ConfigureEnvLayer;
+#[allow(deprecated)]
 pub use self::default_env_layer::DefaultEnvLayer;
 
 pub enum MetadataMigrationFYI<T> {