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-# Introduction
-
-The [Subplot][] library `daemon` for Python provides scenario steps
-and their implementations for running a background process and
-terminating at the end of the scenario.
-
-[Subplot]: https://subplot.liw.fi/
-
-This document explains the acceptance criteria for the library and how
-they're verified. It uses the steps and functions from the
-`lib/daemon` library. The scenarios all have the same structure: run a
-command, then examine the exit code, verify the process is running.
-
-# Daemon is started and terminated
-
-This scenario starts a background process, verifies it's started, and
-verifies it's terminated after the scenario ends.
-
-~~~scenario
-given there is no "/bin/sleep 12765" process
-when I start "/bin/sleep 12765" as a background process as sleepyhead
-then a process "/bin/sleep 12765" is running
-when I stop background process sleepyhead
-then there is no "/bin/sleep 12765" process
-~~~
-
-
-# Daemon takes a while to open its port
-
-[netcat]: https://en.wikipedia.org/wiki/Netcat
-
-This scenario verifies that if the background process never starts
-listening on its port, the daemon library handles that correctly. We
-do this by using [netcat][] to start a dummy daemon, after a short
-delay. The lib/daemon code will wait for netcat to open its port, by
-connecting to the port. It then closes the port, which causes netcat
-to terminate.
-
-~~~scenario
-given a daemon helper shell script slow-start-daemon.sh
-given there is no "slow-start-daemon.sh" process
-when I try to start "./slow-start-daemon.sh" as slow-daemon, on port 8888
-when I stop background process slow-daemon
-then there is no "slow-start-daemon.sh" process
-~~~
-
-~~~{#slow-start-daemon.sh .file .sh .numberLines}
-#!/bin/bash
-
-set -euo pipefail
-
-sleep 2
-netcat -l 8888 > /dev/null
-echo OK
-~~~
-
-# Daemon never opens the intended port
-
-This scenario verifies that if the background process never starts
-listening on its port, the daemon library handles that correctly.
-
-~~~scenario
-given there is no "/bin/sleep 12765" process
-when I try to start "/bin/sleep 12765" as sleepyhead, on port 8888
-then starting daemon fails with "ConnectionRefusedError"
-then a process "/bin/sleep 12765" is running
-when I stop background process sleepyhead
-then there is no "/bin/sleep 12765" process
-~~~
-
-
-# Daemon stdout and stderr are retrievable
-
-Sometimes it's useful for the step functions to be able to retrieve
-the stdout or stderr of of the daemon, after it's started, or even
-after it's terminated. This scenario verifies that `lib/daemon` can do
-that.
-
-~~~scenario
-given a daemon helper shell script chatty-daemon.sh
-given there is no "chatty-daemon" process
-when I start "./chatty-daemon.sh" as a background process as chatty-daemon
-when daemon chatty-daemon has produced output
-when I stop background process chatty-daemon
-then there is no "chatty-daemon" process
-then daemon chatty-daemon stdout is "hi there\n"
-then daemon chatty-daemon stderr is "hola\n"
-~~~
-
-We make for the daemon to exit, to work around a race condition: if
-the test program retrieves the daemon's output too fast, it may not
-have had time to produce it yet.
-
-
-~~~{#chatty-daemon.sh .file .sh .numberLines}
-#!/bin/bash
-
-set -euo pipefail
-
-trap 'exit 0' TERM
-
-echo hola 1>&2
-echo hi there
-~~~
-
-
----
-title: Acceptance criteria for the lib/daemon Subplot library
-author: The Subplot project
-bindings:
-- daemon.yaml
-template: python
-functions:
-- daemon.py
-- runcmd.py
-...