From a171ae9a44d922b53d0c3fd56ee0ef2a723d61b5 Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Mon, 28 Jan 2019 23:50:19 +0100
Subject: [PATCH] Add docker-clean job

Signed-off-by: Knut Ahlers <knut@ahlers.me>
---
 defaults/main.yml |  2 ++
 tasks/main.yml    | 78 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/defaults/main.yml b/defaults/main.yml
index d8ecf6c..b395fe3 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -5,6 +5,8 @@ docker_compose_stop_action: down
 docker_compose_validate: true
 docker_compose_reload_max_delay: 0 # Have no delay, should be less than docker_compose_reload_minutes
 
+docker_compose_add_cleanjob: false
+
 docker_compose_config:
   version: "3"
   services:
diff --git a/tasks/main.yml b/tasks/main.yml
index 4ec548b..93f106c 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -123,3 +123,81 @@
     daemon_reload: yes
     state: restarted
   when: docker_compose_reload_timer.changed and packer_build_name is not defined
+
+- name: Install docker-clean script
+  copy:
+    content: |
+      #!/bin/bash
+      set -euo pipefail
+      
+      function step() { echo $@; }
+      
+      step "Removing containers created / exited >= ~1h ago..."
+      CONTAINERS=$(docker ps -a | gawk '/(hours?|days?|weeks?|months?) ago\s+(Created|Exited)/{ print $1 }' | xargs)
+      [ -n "${CONTAINERS}" ] && docker rm ${CONTAINERS}
+      
+      step "Removing unused and dangling images..."
+      docker image prune -a -f
+    dest: /usr/local/bin/docker-clean
+    mode: '0755'
+    owner: 'root'
+    group: 'root'
+  when: docker_compose_add_cleanjob
+
+- name: Install docker-clean.service
+  copy:
+    dest: /etc/systemd/system/docker-clean.service
+    content: |
+      [Unit]
+      Description=Clean out old containers and unused images
+
+      [Service]
+      Type=oneshot
+      ExecStart=/usr/local/bin/docker-clean
+  when: docker_compose_add_cleanjob
+
+- name: Install docker-clean.timer
+  copy:
+    dest: /etc/systemd/system/docker-clean.timer
+    content: |
+      [Unit]
+      Description=Clean out old containers and unused images
+
+      [Timer]
+      OnCalendar=*:0
+
+      [Install]
+      WantedBy=timers.target
+  register: docker_compose_clean_timer
+  when: docker_compose_add_cleanjob
+
+- name: Enable docker-clean timer
+  systemd:
+    name: docker-clean.timer
+    daemon_reload: yes
+    enabled: yes
+  when: docker_compose_add_cleanjob
+
+- name: Restart docker-clean.timer if it changed
+  systemd:
+    name: docker-clean.timer
+    daemon_reload: yes
+    state: restarted
+  when: docker_compose_clean_timer is defined and docker_compose_clean_timer.changed and packer_build_name is not defined and docker_compose_add_cleanjob
+
+- name: Deactivate docker-clean timer
+  systemd:
+    name: docker-clean.timer
+    daemon_reload: yes
+    enabled: no
+  when: not docker_compose_add_cleanjob
+
+- name: Uninstall docker-clean components
+  file:
+    dest: '{{ item }}'
+    state: absent
+  with_items:
+    - /usr/local/bin/docker-clean
+    - /etc/systemd/system/docker-clean.service
+    - /etc/systemd/system/docker-clean.timer
+  when: not docker_compose_add_cleanjob