copr-builders: assert 15G free space in /var/lib/copr-rpmbuild

roles/copr/backend/files/provision/check_path_free_space.yml

@@ -0,0 +1,9 @@
+---
+- name: "call dnf on {{ path }}"
+  shell: "df '{{ path }}' --output=avail | tail -1"
+  register: df
+  changed_when: false
+
+- name: "assert {{ path }} has {{ size }} bytes left (has {{ df.stdout }})"
+  assert:
+    that: "df.stdout|int > size|int"

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -246,3 +246,13 @@
     success_msg: "Builder has enough memory/swap!"
   when:
   - prepare_base_image is not defined
+
+- name: check disk space
+  include_tasks:
+    file: check_path_free_space.yml
+  vars:
+    path: "{{ item.path }}"
+    size: "{{ item.size|int }}"
+  loop:
+    - path: /var/lib/copr-rpmbuild
+      size: 15000000