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Re: Determing if pipe exists

From: Brendan Strejcek
Subject: Re: Determing if pipe exists
Date: Wed, 4 May 2005 14:24:50 -0500
User-agent: Mutt/1.5.6+20040907i

Brian Seppanen wrote:

> So what I need to do is configure cfengine to detect if this file
> exists as a pipe or as a regular file. If it exists as a regular file
> delete the file and create a pipe, and make sure the ownership and
> permissions are correct.


> I think I've seen an ifFileExists ( ), but I'm not sure that would
> work.

You might be interested in:

There is no test for pipeness, but IsPlain() might be useful to detect
non-pipes, depending on the logic you prefer.

This is what I would do:

        is_pipe = (
            ReturnsZero(/bin/sh -c '
                /bin/ls -l /path/to/pipe | /bin/grep ^p >/dev/null 2>&1
            "/bin/rm -f /path/to/pipe"
            "/usr/bin/mkfifo /path/to/pipe"
            "/bin/chown ${pipe_ownership} /path/to/pipe"

            "/bin/chmod ${pipe_mode} /path/to/pipe"

You could also add a files: section so the permissions get verified on
every run, even when is_pipe evaluates to true.


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