Test suite: reliably wait for post-Greeter hooks
Originally created by Tails on #5666 (Redmine)
In the I log in to a new session
step we should do something which
waits for all Tails Greeter post-hooks to finish so we can rid ourselves
of steps like Tails Greeter has dealt with the sudo password
.
This may include making changes to Tails Greeter, e.g. having it create
a file when it’s done that we can wait for in the end of the I log in to a new session
step.
It may be that opening a new GNOME session (which happens right after tails-greeter is done IIRC) creates such a file that we could poll for.
Feature Branch: test/5666-wait-for-greeter-PostLogin