Adapt config / installed packages to allow keeping systemd

CHANGELOG.md

@@ -22,6 +22,7 @@ For migration information, you can always have a look at https://liip-drifter.re
 - flush handlers at the end of relevent roles to ensure services are available
 - fix an error where the destination directory contains spaces
 - ensure git is installed before synching git config
+- ensure libpam-systemd installed and sshd configured to use it; this obviates the need to remove systemd
 
 ## [1.0.6] - 2016-08-12
 

provisioning/roles/base/tasks/main.yml

@@ -1,12 +1,8 @@
+# python-apt is needed for the Ansible 'apt' module, used later in this file.
 - name: ensure python-apt is installed
   command: apt-get install -y python-apt creates=/usr/share/pyshared/apt
   become: yes
 
-- name: remove systemd on Debian
-  apt: name=systemd state=absent
-  become: yes
-  when: "ansible_distribution == 'Debian'"
-
 - name: ensure apt database is up-to-date
   apt: update_cache=yes
   become: yes
@@ -47,6 +43,24 @@
     - ncurses-term
     - python-pycurl # needed by ansible to add apt repos
 
+# Avoid vagrant problem specific to debian guests, see https://github.com/mitchellh/vagrant/issues/6207#issuecomment-234332985
+# If systemd is installed, ensure that libpam-systemd is installed too, and enable it in the sshd config.
+- name: Check if systemd is installed
+  shell: dpkg-query -W 'systemd'
+  ignore_errors: True
+  register: systemd_installed
+
+- name: ensure libpam-systemd is installed if systemd is installed
+  apt: pkg=libpam-systemd
+  become: yes
+  when: systemd_installed|success
+
+- name: Ensure UsePAM sshd config set if systemd is installed
+  lineinfile: dest=/etc/ssh/sshd_config line='UsePAM yes' state=present
+  notify: restart ssh
+  become: yes
+  when: systemd_installed|success
+
 # Some programs such as PostgreSQL use the current locale to create the base
 # databases. If the locale is set to a value that isn't installed on the
 # system, PostgreSQL installation will fail