X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/df591042778408d03d410d5c22a669d85652d1ea..524c20020594ba67a2a822eccb632f8a5f5dc3ce:/sdk/cwl/arvados_cwl/fsaccess.py

diff --git a/sdk/cwl/arvados_cwl/fsaccess.py b/sdk/cwl/arvados_cwl/fsaccess.py
index 0b577b06a2..15689a9010 100644
--- a/sdk/cwl/arvados_cwl/fsaccess.py
+++ b/sdk/cwl/arvados_cwl/fsaccess.py
@@ -22,6 +22,8 @@ import arvados.collection
 import arvados.arvfile
 import arvados.errors
 
+from googleapiclient.errors import HttpError
+
 from schema_salad.ref_resolver import DefaultFetcher
 
 logger = logging.getLogger('arvados.cwl-runner')
@@ -122,7 +124,13 @@ class CollectionFsAccess(cwltool.stdfsaccess.StdFsAccess):
             return super(CollectionFsAccess, self).open(self._abs(fn), mode)
 
     def exists(self, fn):
-        collection, rest = self.get_collection(fn)
+        try:
+            collection, rest = self.get_collection(fn)
+        except HttpError as err:
+            if err.resp.status == 404:
+                return False
+            else:
+                raise
         if collection is not None:
             if rest:
                 return collection.exists(rest)