Andrei Popescu:
Why should I write a script? I'm not a programmer.
I can write a (simple) shellscript, but I wouldn't dare write an
initscript or even a daemontools runscript.
You have an incorrect mental model of the relative difficulty of the
tasks. A run program for a daemontools-family service is a handful of
lines of script, often a one-liner. And many shell constructs are
simply unnecessary, to the point that people sometimes don't even write
these scripts with a shell as the interpreter at all, using one of the
several simpler script interpreters available instead (such as
execline). (And there's nothing saying that run programs even have to
be interpreted scripts at all.) Gerrit Pape has collected a few run
scripts over the years, and one can see what a typical run script looks
like. The one for squid is at
http://smarden.org/runit/runscripts.html#squid for example. Wayne
Marshall also made an annotated collection about 10 years ago, which can
be seen at http://thedjbway.b0llix.net/services.html . An /etc/init.d/
script, on the other hand, is lots of shell in comparison and by far the
more difficult of the twain to write.
The irony is that your stated ability to write a simple shell script is
in fact enough to be able to write a run script for a daemontools-family
service.
Andrei Popescu:
I recently needed something to run imapfilter and restart it in case
it might exit, so I had a look at daemontools. I gave up quickly after I
realised the amount of scaffolding required just to get daemontools
itself running (additional top-level directories, are you kidding?).
The service scanner directory used by the daemontools-run package in
Debian Linux is /etc/service/, which is not a top-level directory by
anyone's measure. You actually have a Debian package with the
Debianisms already built in for you. You'd have done much better to
have started with it.
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