Restart or exit when command exits?

[sussycatgirl]

Hi!

I'm trying to stream a v4l2 device, and I run mjpeg-server in a systemd service that starts after another service that writes to the video device starts. Sometimes I run into a race condition where the command passed to the mjpeg server can't yet access the camera and crashes. When that happens, I see exit status 255 logged, but from what I can tell the program makes no effort to restart it.

As a workaround I can pass something like bash -c 'while [[ true ]]; do gst-launch-1.0 ....; done', but I think there should be an option for mjpeg-server to either restart the process or also exit when the process exits (the latter would let systemd handle the restarting in my use case).

Cheers!