Add env var to disable cache

api/python/quilt3/packages.py

@@ -16,7 +16,7 @@
 import jsonlines
 from tqdm import tqdm
 
-from . import workflows
+from . import util, workflows
 from .backends import get_package_registry
 from .data_transfer import (
     calculate_sha256,
@@ -499,10 +499,11 @@ def install(cls, name, registry=None, top_hash=None, dest=None, dest_registry=No
             # Copy the datafiles in the package.
             physical_key = entry.physical_key
 
-            # Try a local cache.
-            cached_file = ObjectPathCache.get(str(physical_key))
-            if cached_file is not None:
-                physical_key = PhysicalKey.from_path(cached_file)
+            if util.IS_CACHE_ENABLED:
+                # Try a local cache.
+                cached_file = ObjectPathCache.get(str(physical_key))
+                if cached_file is not None:
+                    physical_key = PhysicalKey.from_path(cached_file)
 
             new_physical_key = dest_parsed.join(logical_key)
             if physical_key != new_physical_key:
@@ -512,7 +513,11 @@ def _maybe_add_to_cache(old: PhysicalKey, new: PhysicalKey, _):
             if not old.is_local() and new.is_local():
                 ObjectPathCache.set(str(old), new.path)
 
-        copy_file_list(file_list, callback=_maybe_add_to_cache, message="Copying objects")
+        copy_file_list(
+            file_list,
+            callback=_maybe_add_to_cache if util.IS_CACHE_ENABLED else None,
+            message="Copying objects",
+        )
 
         pkg._build(name, registry=dest_registry, message=message)
         if top_hash is None:

api/python/quilt3/util.py

@@ -20,6 +20,11 @@
 import yaml
 from appdirs import user_cache_dir, user_data_dir
 
+
+def get_bool_from_env(var_name: str):
+    return os.getenv(var_name, '').lower() == 'true'
+
+
 APP_NAME = "Quilt"
 APP_AUTHOR = "QuiltData"
 BASE_DIR = user_data_dir(APP_NAME, APP_AUTHOR)
@@ -30,8 +35,10 @@
 OPEN_DATA_URL = "https://open.quiltdata.com"
 
 PACKAGE_NAME_FORMAT = r"([\w-]+/[\w-]+)(?:/(.+))?$"
-DISABLE_TQDM = os.getenv('QUILT_MINIMIZE_STDOUT', '').lower() == 'true'
+DISABLE_TQDM = get_bool_from_env('QUILT_MINIMIZE_STDOUT')
 PACKAGE_UPDATE_POLICY = {'incoming', 'existing'}
+IS_CACHE_ENABLED = not get_bool_from_env('QUILT_DISABLE_CACHE')
+
 
 # CONFIG_TEMPLATE
 # Must contain every permitted config key, as well as their default values (which can be 'null'/None).