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95f1d6bfec
This reworks systemd-run so that in --pty mode we watch the unit state the way we do it in --wait mode. Whenever we notice that the service is in failed or inactive state finish right-away, but first write all unwritten characters we can read from the master TTY device. This makes sure that when the TTY service fails before it opens the slave PTY device we properly notice that and exit early, so that borked start parameters result in immediate systemd-run failure. Previously, we'd not notice this at all, as a PTY slave that never was opened won't result in POLLHUP events, and we'd hence simply keep reading from it forever. In essence, --pty now enables the same unit watching logic that --wait enables. However, unless --wait is specified we won#t show the final summary, hence the effective difference should be pretty minimal. Fixes: #3915
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