⚠ This post is fairly old. I don't keep it up to date. Be sure to see comments where some people have posted updates
What this will cover
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Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services,
no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.
Let's create a example foo service that when started creates a file, and when stopped it deletes it.
Create executable file /opt/foo/setup-foo.sh:
| defmodule LearningPorts do | |
| def main do | |
| parent = self() | |
| # if we need to control STDIN, the fun begins: | |
| # unfortunately we can't close the port's stdin without closing the port. | |
| # so it'll block waiting forever for an EOF that'll never appear. | |
| # | |
| # so we use a wrapper program that allows us to specify a sentinel line |