Create results_cache_index from filename instead of path

Signed-off-by: Jono Yang <jyang@nexb.com>

Author: JonoYang

src/scancode/cli.py

@@ -1278,7 +1278,7 @@ def scan_codebase(
     """
 
     # NOTE: we never scan directories
-    resources = ((r.location, r.path) for r in codebase.walk() if r.is_file)
+    resources = ((r.location, r.path, r.name) for r in codebase.walk() if r.is_file)
 
     use_threading = processes >= 0
     runner = partial(
@@ -1415,7 +1415,7 @@ def terminate_pool_with_backoff(pool, number_of_trials=3):
 
 
 def scan_resource(
-    location_path,
+    location_path_name,
     scanners,
     timeout=DEFAULT_TIMEOUT,
     with_timing=False,
@@ -1443,7 +1443,7 @@ def scan_resource(
     processing and threading works.
     """
     scan_time = time()
-    location, path = location_path
+    location, path, name = location_path_name
     results = {}
     scan_errors = []
     timings = {} if with_timing else None
@@ -1461,7 +1461,7 @@ def scan_resource(
     results_cache_index = ''
     if use_cached_results:
         # compute results_cache_index
-        results_cache_index = results_cache.compute_results_cache_index(location=location, path=path)
+        results_cache_index = results_cache.compute_results_cache_index(location=location, filename=name)
 
         # update `results` with cached data or add scanner to scanners_to_run if no
         # cache data is available

src/scancode/results_cache.py

@@ -26,14 +26,13 @@ def hasher_from_chunks(chunks):
     return hasher
 
 
-def compute_results_cache_index(location, path):
+def compute_results_cache_index(location, filename):
     """
     Compute results_cache_index value for a Resource at `location`.
     """
     chunks = binary_chunks(location=location)
     sha256_hasher = hasher_from_chunks(chunks=chunks)
-    # TODO: consider using filename instead of path
-    sha256_hasher.update(path.encode('utf-8', 'surrogateescape'))
+    sha256_hasher.update(filename.encode('utf-8', 'surrogateescape'))
     return sha256_hasher.hexdigest()