add script + doc to remove everything

docs/uninstalling.md

@@ -19,3 +19,6 @@ However, if you've installed this on some server where you have other stuff you
 - uninstall Docker itself, if necessary
 
 - delete the `/matrix` directory (`rm -rf /matrix`)
+
+The script `/usr/local/bin/matrix-remove-all` performs all these steps (**use with caution!**).
+

roles/matrix-server/tasks/setup/setup_main.yml

@@ -54,3 +54,10 @@
   shell:
     cmd: "docker network create --driver=bridge {{ matrix_docker_network }}"
   when: "result_check_docker_network.stdout == ''"
+
+- name: Ensure matrix-remove-all script created
+  template:
+    src: "{{ role_path }}/templates/usr-local-bin/matrix-remove-all.j2"
+    dest: "/usr/local/bin/matrix-remove-all"
+    mode: 0750
+

roles/matrix-server/templates/usr-local-bin/matrix-remove-all.j2

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+if [ "$(id -u)" != "0" ]; then
+        echo "This script must be executed as root! Aborting."
+        exit 1
+fi
+
+echo "WARNING! You are about to remove everything the playbook installs for matrix.{{ host_specific_hostname_identity }}: matrix, docker images,..."
+echo -n "If you're sure you want to do this, type: 'Yes, I really want to remove everything!'"
+read sure
+
+if [ "$sure" != "Yes, I really want to remove everything!" ]; then
+        echo "Good thing I asked, exiting"
+        exit 0
+else
+        echo "Stop and remove matrix services"
+        for s in $(find /etc/systemd/system/ -name "matrix-*" -printf "%f\n"); do
+                systemctl stop $s
+                rm -f /etc/systemd/system/$s
+        done
+        systemctl daemon-reload
+        echo "Remove matrix cronjobs"
+        find /etc/cron.d/ -name "matrix-*" -delete
+        echo "Remove matrix scripts"
+        find /usr/local/bin/ -name "matrix-*" -delete
+        echo "Remove every docker images"
+        docker rmi $(docker images -aq)
+        echo "Remove docker matrix network"
+        docker network rm matrix
+        echo "Remove /matrix directory"
+        rm -fr /matrix
+        exit 0
+fi
+