copr: add a playbook to prepare builder in AWS

The `builderpb_nova_aws.yml` playbook doesn't spin up a new instance yet.
We currently have a one testing instance in AWS so the playbook
always provisions that particular instance.

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

@@ -0,0 +1,44 @@
+- name: check/create instance
+  hosts: 127.0.0.1
+  gather_facts: False
+
+  vars_files:
+    - vars.yml
+    - nova_cloud_vars.yml
+
+  vars:
+    keypair: buildsys
+    max_spawn_time: 1100
+    spawning_vm_user: "fedora"
+    image_name: "{{ builder_images.x86_64 }}"
+
+  tasks:
+    - name: so far we have only one instance in AWS so it will always be the same address
+      set_fact: builder_ip="34.254.223.48"
+
+    - name: add builder ip to the special group
+      local_action: add_host hostname="34.254.223.48" groupname=builder_temp_group
+
+
+- name: provision builder
+  hosts: builder_temp_group
+  gather_facts: True
+  sudo: True
+  user: fedora
+
+  vars_files:
+    - vars.yml
+    - nova_cloud_vars.yml
+
+  vars:
+    ansible_python_interpreter: /usr/bin/python3
+    swap_file_path: "/swapfile"
+    swap_file_size_mb: 1024
+
+  tasks:
+  - include: "create_swap_file.yml"
+    when:
+    - prepare_base_image is defined
+
+  - include: "provision_builder_tasks.yml"
+  - include: "offloading_hack.yml"

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

@@ -0,0 +1,47 @@
+- name: Create swap file
+  command: dd if=/dev/zero of={{ swap_file_path }} bs=1024 count={{ swap_file_size_mb }}k
+           creates="{{ swap_file_path }}"
+  tags:
+    - swap.file.create
+
+
+- name: Change swap file permissions
+  file: path="{{ swap_file_path }}"
+        owner=root
+        group=root
+        mode=0600
+  tags:
+    - swap.file.permissions
+
+
+- name: "Check swap file type"
+  command: file {{ swap_file_path }}
+  register: swapfile
+  tags:
+    - swap.file.mkswap
+
+
+- name: Make swap file
+  command: "sudo mkswap {{ swap_file_path }}"
+  when: swapfile.stdout.find('swap file') == -1
+  tags:
+    - swap.file.mkswap
+
+
+- name: Write swap entry in fstab
+  mount: name=none
+         src={{ swap_file_path }}
+         fstype=swap
+         opts=sw
+         passno=0
+         dump=0
+         state=present
+  tags:
+    - swap.fstab
+
+
+- name: Mount swap
+  command: "swapon {{ swap_file_path }}"
+  when: ansible_swaptotal_mb < 1
+  tags:
+    - swap.file.swapon