Enable swap for TB

roles/crawler/tasks/enable-swap-for-tb.yml

@@ -0,0 +1,32 @@
+---
+# Tor Browser requires swap and may experience irregular errors without it.
+# Credit to Parménides GV (https://github.com/parmegv) for this tasklist.
+
+- name: Create swap file.
+  command: fallocate -l {{ (ansible_memtotal_mb / 1000 / 2)|round(0, 'ceil')|int }}G /swapfile
+           creates=/swapfile
+  when: ansible_swaptotal_mb < 1
+  register: swapfile_created
+
+- name: Set swapfile permissions.
+  file: path=/swapfile
+        mode=0600
+  when: swapfile_created.changed
+
+- name: Format swapfile as swap.
+  command: mkswap /swapfile
+  when: swapfile_created.changed
+
+- name: Add swap to fstab.
+  mount: name=swapfile
+         src=/swapfile
+         fstype=swap
+         opts=sw
+         passno=0
+         dump=0
+         state=present
+  when: swapfile_created.changed
+
+- name: Enable swap.
+  command: swapon /swapfile
+  when: swapfile_created.changed

roles/crawler/tasks/main.yml

@@ -18,6 +18,7 @@
   - include: configure.yml
     tags: configure
   - include: download-verify-tbb.yml
+  - include: enable-swap-for-tb.yml
   - include: download-verify-tor.yml
   - include: build-install-tor.yml
   - include: install-systemd-unit.yml