not sure why it doesn't work the other way

.circleci/create-virtualenv.sh

@@ -1,4 +1,7 @@
-#!/bin/bash -eo pipefail
+#!/bin/bash
+
+# https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
+set -euxo pipefail
 
 # The filesystem location of the wheelhouse which we'll populate with wheels
 # for all of our dependencies.

.circleci/populate-wheelhouse.sh

@@ -1,4 +1,7 @@
-#!/bin/bash -eo pipefail
+#!/bin/bash
+
+# https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
+set -euxo pipefail
 
 # Python packages we need to support the test infrastructure.  *Not* packages
 # Tahoe-LAFS itself (implementation or test suite) need.