Addressing crashing hosts when developing docker containers.

See geerlingguy/docker-ubuntu1804-ansible#12

.gitignore

@@ -24,7 +24,7 @@ devmaster_id_rsa.pub
 bin/*
 ~bin/devshop
 !bin/branch-or-tag
-!bin/docker-entrypoint
+!bin/docker*
 !bin/hosting-queue-runner
 !bin/mysql-wait
 

Dockerfile

@@ -73,6 +73,9 @@ RUN chmod 766 $DEVSHOP_TESTS_ASSETS_PATH
 
 RUN ansible --version
 
+# Cleanup unwanted systemd files. See bin/docker-systemd-clean.
+RUN docker-systemd-clean
+
 # Remove Home Directory if desired so that devshop code is reinstalled.
 RUN if [ $DEVSHOP_REBUILD_HOME ]; then rm -rf /var/aegir; fi
 

bin/docker-systemd-clean

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -e
+
+devshop-logo "Cleaning up SystemD"
+echo "This should only be run inside a container with SystemD."
+echo "See https://github.com/geerlingguy/docker-ubuntu1804-ansible/pull/12"
+
+# @TODO: Make this multi-os, and determine if there are any unwanted side effects.
+# The "ls" command should fail, breaking any build without this path.
+ls -la /lib/systemd
+
+find /lib/systemd/system/sysinit.target.wants/* ! -name systemd-tmpfiles-setup.service -delete;
+rm -f /lib/systemd/system/multi-user.target.wants/*;
+rm -f /etc/systemd/system/*.wants/*;
+rm -f /lib/systemd/system/local-fs.target.wants/*;
+rm -f /lib/systemd/system/sockets.target.wants/*udev*;
+rm -f /lib/systemd/system/sockets.target.wants/*initctl*;
+rm -f /lib/systemd/system/basic.target.wants/*;
+rm -f /lib/systemd/system/anaconda.target.wants/*;find /lib/systemd/system/sysinit.target.wants/* ! -name systemd-tmpfiles-setup.service -delete;