# Render with: `mscgen -T svg -i zincati-fleetlock.msc`

msc {
  "OS", "Zincati agent", "FleetLock service", "rpm-ostree daemon";

  ...;
  |||;
  "Zincati agent" rbox "FleetLock service" [label="Reboot slot locked\n(possibly, from previous update)\n", textbgcolour="#cecece"],
  |||;

  |||;
  --- [label="System boot"],
  "OS" -> "Zincati agent" [label="Start zincati.service", arcskip=1];
  |||;
  "Zincati agent" => "FleetLock service" [label="POST /v1/steady-state", arcskip=1];
  |||;
  "Zincati agent" note "FleetLock service" [label="(Keep trying until steady-state is acknowledged...)\n"];
  "FleetLock service" >> "Zincati agent" [label="OK", arcskip=1];
  |||;
  "Zincati agent" rbox "Zincati agent" [label="Released any owned reboot slot", textbgcolour="#46b8e3"],
  "FleetLock service" rbox "FleetLock service" [label="Locked reboot slots: 0", textbgcolour="#ff7f7f"],
  |||;

  |||;
  ... [label="New update target found (TargetRevision)"];
  |||;

  "Zincati agent" => "rpm-ostree daemon" [label="Deploy(TargetRevision)", arcskip=1];
  |||;
  "rpm-ostree daemon" >> "Zincati agent" [label="OK", arcskip=1];
  |||;
  "Zincati agent" => "FleetLock service" [label="POST /v1/pre-reboot", arcskip=1];
  |||;
  "Zincati agent" note "FleetLock service" [label="(Keep trying until a reboot slot is available...)\n"];
  "FleetLock service" >> "Zincati agent" [label="OK", arcskip=1];
  |||;
  "Zincati agent" rbox "Zincati agent" [label="Owning a reboot slot", textbgcolour="#46b8e3"],
  "FleetLock service" rbox "FleetLock service" [label="Locked reboot slots: 1", textbgcolour="#ff7f7f"],
  |||;

  |||;
  "Zincati agent" => "rpm-ostree daemon" [label="Finalize(TargetRevision)", arcskip=1];
  |||;
  "rpm-ostree daemon" >> "Zincati agent" [label="OK", arcskip=1],
  |||;
  "rpm-ostree daemon" => "OS" [label="Reboot", arcskip=2];
  |||;
  --- [label="System reboot"];
  |||;
  "Zincati agent" rbox "FleetLock service" [label="Reboot slot locked\n(for current update)\n", textbgcolour="#cecece"];
  ...;
}