Add script to clear out machine information

ubuntu/cloud/scripts/clear-machine-information.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+echo "==> Autoremove packages and clear the package cache"
+apt-get --assume-yes autoremove
+apt-get --assume-yes clean
+
+echo "==> Reset machine ID"
+truncate -s 0 /etc/machine-id
+[ -f /var/lib/dbus/machine-id ] && truncate -s 0 /var/lib/dbus/machine-id
+
+echo "==> Remove SSH host keys (will be regenerated on first boot)"
+rm --force /etc/ssh/ssh_host_*
+
+echo "==> Remove the random seed file (will be regenerated on first boot)"
+systemctl --quiet is-active systemd-random-seed.service && systemctl stop systemd-random-seed.service
+[ -f /var/lib/systemd/random-seed ] && rm --force /var/lib/systemd/random-seed
+
+echo "==> Clear log files"
+find /var/log -type f -delete
+
+echo "==> Clear the bash history"
+export HISTSIZE=0
+truncate -s 0 ~/.bash_history
+unset HISTFILE

ubuntu/cloud/x86_64/README.md

@@ -266,8 +266,8 @@ enp1s0           UP             192.168.107.79/24 fda2:8d37:bed8:93ee:5054:ff:fe
 ```
 
 ```
-$ virsh shutdown ubuntu-server-2004
-$ virsh undefine ubuntu-server-2004 --nvram --remove-all-storage
+$ virsh shutdown ubuntu-server-2204
+$ virsh undefine ubuntu-server-2204 --nvram --remove-all-storage
 ```
 
 ## Ubuntu 22.04 BIOS virtual firmware

ubuntu/cloud/x86_64/ubuntu.pkr.hcl

@@ -112,6 +112,7 @@ build {
     scripts = [
       "../scripts/disable-updates.sh",
       "../scripts/qemu.sh",
+      "../scripts/clear-machine-information.sh"
     ]
   }
 }