Added check for admin password in GUI updater

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Fixes #4387

Adds a check for the administration password when Update Now is clicked in the GUI updater in Tails. If an administration password is set, the update proceeds as normal. If a password is not set, a modal dialog is displayed with an appropriate message, and the Update Now button is disabled.

Testing

• On an existing install (prod VMs or hardware), start up Tails workstation with PV unlocked. Check out this branch.
• Reboot Tails with PV unlocked and an admin password not set.
• verify that the GUI updater appears after Tails connects to the Tor network
• click Update Now. Verify that the modal warning appears, the Update Now button is disabled, and the update is not triggered.
• Reboot Tails with PV unlocked and an admin password set
• verify that the GUI updater appears after Tails connects to the Tor network
• click Update Now. Verify that the modal does not appear, and that the update is triggered.

Deployment

Deployed with initial install or workstation code update.

Checklist

If you made non-trivial code changes:

• I have written a test plan and validated it for this PR

[eloquence]

Works as expected, tested with a patched 0.14.0 tag and a patched develop, on Tails 3.16 series prod Admin Workstation.

• Modal comes up when admin password is not set.
• Modal does not come up when admin password is set.
• "Update now" button is greyed out when expected, and is not clickable.
• "Update now" button is active when expected, and is clickable.
• Updates work as expected.

GUI code should be reviewed by someone familiar w/ that codebase but I think if any additional pre-QA interactive testing is required here, it should be on Tails 4.

I did encounter #4878 which I don't think is a regression; I've seen that in prod before. I will try to do another clean repro on that.

[emkll]

Tested in Tails VM 3.16, test plan and visual review looks good to me:

• Reboot Tails with PV unlocked and an admin password not set.
• verify that the GUI updater appears after Tails connects to the Tor network
• click Update Now. Verify that the modal warning appears, the Update Now button is disabled, and the update is not triggered.
• Reboot Tails with PV unlocked and an admin password set
• verify that the GUI updater appears after Tails connects to the Tor network
• click Update Now. Verify that the modal does not appear, and that the update is triggered.