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Accepted
joeforker
Asked: 2010-03-23 10:17:17 +0800 CST

Can I pass the LHS of a cfengine3 processes: line to the RHS?

  • 772

I'm using cfengine to start the foobar process. Apparently the LHS is discarded when I use process_select? Can I simply pass the LHS to a function, rather than having to put the command match pattern in a body argument?

I wanted to only match foobar processes belonging to a particular user, since another user could easily be running foobar for testing.

bundle agent foobar {
processes:
    "foobar" # documented way would be to use .* here
        process_select => command("foobar"),
        restart_class => start_foobar;

commands:
    start_foobar::
        "/usr/bin/foobar";
}

body process_select command(c) {
    command => "$(c)";
    process_result => "command";
}
cfengine

1 Answers

  1. Best Answer

    As far as I know, if you just want to look for the "foobar" process, you don't need to use the process_select feature at all.

    Can't you just do this?

    processes:
    "foobar"
        restart_class => start_foobar;

    If you also need to match other criteria at the same time, like the user running it as you suggest, I would recommend either using a variable like:

    vars:
   "program" string => "foobar";

    Or, better still, writing a bundle that takes some parameters, something like this:

    bundle agent restart(program, path) {
processes:
    "${program}" # documented way would be to use .* here
        process_select => command("${program}"),
        restart_class => start_foobar;

commands:
    start_foobar::
        "${path}/${program}";
}

body process_select command(c) {
    command => "$(c)";
    process_result => "command";
}

    And then just call this bundle as restart("foobar", "/usr/bin").

    I haven't tested the code above, you might have to tweak it!

    • 2