Merge branch 'serial-port' into 'master'

float-base: add optional serial port support

See merge request !244

roles/float-base/defaults/main.yml

@@ -42,6 +42,13 @@ motd: |2
                       ╹  ┗━╸┗━┛╹ ╹ ╹     {{ inventory_hostname }}
 
 
+
 # Enable kernel lockdown measures (e.g. disable module loading post-boot)
 # Once enabled this feature can be disabled only with a reboot.
 kernel_lockdown_enabled: false
+
+# When enabled, the kernel GRUB and getty will be using configured to use
+# serial port 0 (by default)
+enable_serial_port: false
+serial_port_unit: 0
+serial_port_speed: 115200

roles/float-base/handlers/main.yml

@@ -70,3 +70,5 @@
 - name: update-ca-certificates
   command: "/usr/sbin/update-ca-certificates"
 
+- name: update-grub
+  command: /usr/sbin/update-grub

roles/float-base/tasks/main.yml

@@ -83,6 +83,9 @@
 - include_tasks: osquery.yml
   when: enable_osquery|bool
 
+- include_tasks: serial.yml
+  when: enable_serial_port|bool
+
 - name: Check ipmi availability
   stat:
     path: "/dev/ipmi0"

roles/float-base/tasks/serial.yml

+# Enable serial output for logins and kernel/GRUB (if running GRUB)
+
+- name: Enable getty on serial port
+  systemd:
+    name: "getty@ttyS{{ serial_port_unit }}"
+    enabled: yes
+    state: started
+
+- name: Check GRUB availability
+  stat:
+    path: "/usr/sbin/update-grub"
+  register: grub_present
+
+- name: Configure kernel and GRUB to use the serial port
+  template:
+    src: grub-serial.j2
+    dest: /etc/default/grub.d/30-float-serial.cfg
+  notify:
+    - update-grub
+  when: grub_present.stat.exists == true

roles/float-base/templates/grub-serial.j2

+GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX console=ttyS{{ serial_port_unit }},{{ serial_port_speed }}n8"
+
+GRUB_TERMINAL="$GRUB_TERMINAL serial"
+GRUB_SERIAL_COMMAND="serial --unit={{ serial_port_unit }} --speed={{ serial_port_speed }}"