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With allocateTTY, nixos-rebuild runs with a terminal, so it shows colours
and progress: on remote targets, ssh gets -t, which allocates a terminal
if its own input is one, and on the local target, expect's unbuffer
provides one.
The nixos-rebuild stand-in records whether its output is a terminal.
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For targets using sudo, writeDeploy runs nixos-rebuild on the target via
sudo, so --use-remote-sudo has no effect there. It only matters when
nixos-rebuild runs on a separate build target and activates the system
on the target, so writeDeploy passes it only then.
A new VM test, deploy, runs writeDeploy with a stand-in for
nixos-rebuild, which records the user it runs as, NIX_PATH, and its
arguments, for deploying flakes and other sources, with and without a
separate build target, to every kind of target.
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