What link is a bit weird. https://www.freedesktop.org/software/systemd/man/latest/sd_notify.html https://www.freedesktop.org/software/systemd/man/latest/sd_n...

What link is a bit weird. https://www.freedesktop.org/software/systemd/man/latest/sd_notify.html https://www.freedesktop.org/software/systemd/man/latest/sd_n... documents exactly what is sent and how. You can implement that function yourself very easily. Their edge cases are solved by opening the notification socket before you chroot. Writing to a socket would be just as systemd-specific as the current solution if that's what systemd would expect.