fix: truncate "/var/lib/dbus/machine-id" in case it's separate from "…

…/etc/machine-id" (#1471)

"/var/lib/dbus/machine-id" MAY be a symlink to "/etc/machine-id".[1]  If it
isn't, however, we need to truncate it separately to avoid reuse.

Fixes #1421.

[1]: https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1818499.html

Signed-off-by: Cory Francis Myers <cory@freedom.press>

packer_templates/scripts/debian/cleanup_debian.sh

@@ -49,6 +49,7 @@ find /var/log -type f -exec truncate --size=0 {} \;
 
 echo "blank netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "remove the contents of /tmp and /var/tmp"
 rm -rf /tmp/* /var/tmp/*

packer_templates/scripts/fedora/cleanup_dnf.sh

@@ -38,6 +38,7 @@ rm -f /var/lib/systemd/random-seed
 
 echo "Wipe netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "Clear the history so our install commands aren't there"
 rm -f /root/.wget-hsts

packer_templates/scripts/rhel/cleanup_dnf.sh

@@ -52,6 +52,7 @@ rm -f /var/lib/systemd/random-seed
 
 echo "Wipe netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "Clear the history so our install commands aren't there"
 rm -f /root/.wget-hsts

packer_templates/scripts/rhel/cleanup_yum.sh

@@ -52,6 +52,7 @@ rm -f /var/lib/systemd/random-seed
 
 echo "Wipe netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "Clear the history so our install commands aren't there"
 rm -f /root/.wget-hsts

packer_templates/scripts/suse/cleanup_suse.sh

@@ -19,6 +19,7 @@ rm -rf /tmp/* /var/tmp/*
 
 echo "blank netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "force a new random seed to be generated"
 rm -f /var/lib/systemd/random-seed

packer_templates/scripts/ubuntu/cleanup_ubuntu.sh

@@ -90,6 +90,7 @@ find /var/log -type f -exec truncate --size=0 {} \;
 
 echo "blank netplan machine-id (DUID) so machines get unique ID generated on boot"
 truncate -s 0 /etc/machine-id
+truncate -s 0 /var/lib/dbus/machine-id  # if not symlinked to "/etc/machine-id"
 
 echo "remove the contents of /tmp and /var/tmp"
 rm -rf /tmp/* /var/tmp/*