Session startup

Outside home-manager, write the user service the module would generate to ~/.config/systemd/user/sottomano.service:

[Unit]
Description=sottomano bar
PartOf=graphical-session.target
After=graphical-session.target

[Service]
ExecStart=%h/.cargo/bin/sottomano
Restart=on-failure
RestartSec=2
Slice=session.slice
CPUWeight=500

[Install]
WantedBy=graphical-session.target

Use %h/.nix-profile/bin/sottomano for a Nix profile install, then enable it:

systemctl --user enable --now sottomano.service

session.slice and the raised weight keep the bar responsive when apps load the machine. The service starts with graphical-session.target. niri starts that target itself; sway and Hyprland need a line in their config, as their pages show.

Next: configuration.