How do I detect being run inside a DispVM Template? @marmarek

(How do I detect being run inside a whonix-ws-dvm Template?)

Reason:

• I would want to avoid tb-updater-first-boot to copy Tor Browser from root image's /var/cache/tb-binary to /home/user so the DispVM's tb-updater-first-boot will do that, rather than DispVM Template's tb-updater-first-boot.
• Therefore upgrading whonix-ws (package tb-updater) will result in fresh Tor Browser versions in whonix-wd-dvm based DispVMs (named Disp[...]).

(systemd unit file / script)

Related:
https://www.whonix.org/wiki/Tor_Browser/Advanced_Users#tb-updater_in_Qubes_TemplateVM

Btw Whonix 14 getting close. (Postponed a few difficult tickets.) This ticket (T698) and T698 are the last two remaining ones as it looks now before a testers-only release can be made.