diff --git a/roles/acl-devstack-files/README.rst b/roles/acl-devstack-files/README.rst
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+Grant global read access to devstack `files` folder.
+
+This is handy to grant the `tempest` user access to VM images for testing.
+
+**Role Variables**
+
+.. zuul:rolevar:: devstack_data_dir
+   :default: /opt/stack/data
+
+   The devstack data directory.
diff --git a/roles/acl-devstack-files/defaults/main.yaml b/roles/acl-devstack-files/defaults/main.yaml
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+devstack_data_dir: /opt/stack/data
diff --git a/roles/acl-devstack-files/tasks/main.yaml b/roles/acl-devstack-files/tasks/main.yaml
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+++ b/roles/acl-devstack-files/tasks/main.yaml
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+- name: Grant global read access to devstack files
+  file:
+    path: "{{devstack_data_dir}}/files"
+    mode: "o+rx"
+    recurse: yes
+  become: yes