fix(tf): refine binary provider resolution

testing-framework/deployers/local/src/binary/providers/build.rs

@@ -11,6 +11,7 @@ use std::{
     process::Command,
 };
 
+use sha2::{Digest as _, Sha256};
 use tracing::info;
 
 use crate::binary::{
@@ -95,16 +96,31 @@ impl BuildBinaryProvider {
     }
 
     fn lock_path(&self) -> PathBuf {
-        let lock_file_name = self
-            .output_path
-            .file_name()
-            .and_then(|name| name.to_str())
-            .unwrap_or("binary");
+        let output_path = self.output_path();
+        let lock_file_name = self.lock_file_name(&output_path);
 
         self.lock_dir
             .clone()
             .unwrap_or_else(|| self.workspace_dir().join(".tf-binaries"))
-            .join(format!("{lock_file_name}.lock"))
+            .join(lock_file_name)
+    }
+
+    fn lock_file_name(&self, output_path: &Path) -> String {
+        let binary_name = output_path
+            .file_name()
+            .and_then(|name| name.to_str())
+            .unwrap_or("binary");
+        let artifact_hash = self.artifact_path_hash(output_path);
+
+        format!("{binary_name}-{artifact_hash}.lock")
+    }
+
+    fn artifact_path_hash(&self, output_path: &Path) -> String {
+        Sha256::digest(output_path.to_string_lossy().as_bytes())
+            .iter()
+            .take(8)
+            .map(|byte| format!("{byte:02x}"))
+            .collect()
     }
 
     fn workspace_dir(&self) -> PathBuf {

testing-framework/deployers/local/src/binary/providers/fallback.rs

@@ -11,8 +11,10 @@ use crate::binary::{BinaryProvider, BinaryProviderError, FallbackBinaryProvider}
 impl BinaryProvider for FallbackBinaryProvider {
     fn try_resolve(&self) -> Result<Option<PathBuf>, BinaryProviderError> {
         for provider in &self.providers {
-            if let Some(path) = provider.try_resolve()? {
-                return Ok(Some(path));
+            match provider.resolve() {
+                Ok(path) => return Ok(Some(path)),
+                Err(BinaryProviderError::NotFound { .. }) => continue,
+                Err(error) => return Err(error),
             }
         }
 

testing-framework/deployers/local/src/binary/tests.rs

@@ -2,8 +2,11 @@ use std::{
     fs,
     io::{Read as _, Write as _},
     net::TcpListener,
-    path::Path,
-    sync::Arc,
+    path::{Path, PathBuf},
+    sync::{
+        Arc,
+        atomic::{AtomicUsize, Ordering},
+    },
     thread,
 };
 
@@ -54,6 +57,31 @@ fn resolves_first_available_fallback_provider() {
     assert_eq!(path, binary);
 }
 
+#[test]
+fn fallback_reuses_inner_provider_cache() {
+    let temp = TempDir::new().expect("temp dir");
+    let binary = temp.path().join("node");
+    write_file(&binary, b"binary");
+
+    let resolve_count = Arc::new(AtomicUsize::new(0));
+    let cached_provider: BinaryProviderRef = Arc::new(CountingBinaryProvider::new(
+        &binary,
+        Arc::clone(&resolve_count),
+    ));
+    let first = FallbackBinaryProvider::new([
+        missing_binary_provider(temp.path().join("missing-first")),
+        Arc::clone(&cached_provider),
+    ]);
+    let second = FallbackBinaryProvider::new([
+        missing_binary_provider(temp.path().join("missing-second")),
+        cached_provider,
+    ]);
+
+    assert_eq!(first.resolve().expect("first fallback resolves"), binary);
+    assert_eq!(second.resolve().expect("second fallback resolves"), binary);
+    assert_eq!(resolve_count.load(Ordering::SeqCst), 1);
+}
+
 #[test]
 fn runs_build_command_and_returns_output_path() {
     let temp = TempDir::new().expect("temp dir");
@@ -160,6 +188,40 @@ fn write_file(path: &Path, contents: &[u8]) {
     fs::write(path, contents).expect("write file");
 }
 
+fn missing_binary_provider(path: PathBuf) -> BinaryProviderRef {
+    Arc::new(PathBinaryProvider::new(path))
+}
+
+struct CountingBinaryProvider {
+    path: PathBuf,
+    resolve_count: Arc<AtomicUsize>,
+}
+
+impl CountingBinaryProvider {
+    fn new(path: &Path, resolve_count: Arc<AtomicUsize>) -> Self {
+        Self {
+            path: path.to_owned(),
+            resolve_count,
+        }
+    }
+}
+
+impl BinaryProvider for CountingBinaryProvider {
+    fn try_resolve(&self) -> Result<Option<PathBuf>, BinaryProviderError> {
+        self.resolve_count.fetch_add(1, Ordering::SeqCst);
+
+        Ok(Some(self.path.clone()))
+    }
+
+    fn display(&self) -> String {
+        "counting".to_owned()
+    }
+
+    fn cache_key(&self) -> String {
+        format!("counting:{}", self.path.display())
+    }
+}
+
 fn sha256_hex(bytes: &[u8]) -> String {
     Sha256::digest(bytes)
         .iter()