Vision

As of 2014, incremental upgrades are available inside Tails if running from a USB device installed using Tails Installer. Full upgrades have to be done using a second USB stick and cloning using Tails Installer.

On the long run we want to have all upgrade scenarios, both incremental and full, handled by Tails Upgrader and done directly from Tails. This will make it easier to understand which software does what, and will also improve the overall security of full upgrades by removing the need or the possibility to do them from a different operating system.

Full upgrade scenarios

The following diagram shows all possible upgrade scenarios (implemented or not) given a running Tails (origin), an ISO image, and a destination Tails.

  • Upgrade from ISO and Clone and upgrade are what we already have in Tails Installer.
  • Self full upgrade should be the ideal scenario for full upgrades, that would then be conducted like IUK. See #7499.
  • Hot clone could be a fallback scenario for full upgrades in case you can't download a full ISO. Still, as any clone operation, this introduces the possibility of cross contamination between Tails keys and should be discouraged in favor of self upgrades.

Roadmap

2015

In 2015, we want to clarify the possible upgrade scenarios to the user, when asking for a full upgrade. We will present them as follows:

  • Slow and secure: download, verify in Tails, upgrade from ISO, clone and upgrade: 1'30.
  • Fast: clone and upgrade from a friend: 0'15.
  • Fast and insecure: reboot in host operating system download, upgrade from ISO: 0'30.

Bonus for 2015

  • Automate the download and verification steps of the slow and secure scenario in Tails Upgrader. This could be adapted from the existing mechanisms for IUK.

Future

  • Allow self full upgrades from inside Tails and automate that in Tails Upgrader. See #7499.