Re: exec help?

[Adrian Phillips]

>>>>> "David" == David C Zemke <dzemke@auctionwatch.com> writes:

<snip>

    David> hostname = ( "exec /bin/hostname | sed -e 's/[0-9].*//'" )

    David> The above command works fine from the command line, but is
    David> not evaluated properly by cfengine. Using the -v -d2
    David> option, it looks like it evaluates to the entire string in
    David> the above quotes (e.g. exec /bin/hostname | sed...)

<snip>

Yes, I have had the same problem, the solution for piping is to call
/bin/sh :-

test = ( "exec /bin/sh -c 'echo here is a test | cat'" )

BUT you're going to get into quoting difficulties very fast, so I've
done this using plugins :-

actionsequence = (
        "module:definfo"
)

And in CFINPUT/modules/module:definfo (a cut down version shown here)
:-

    #!/bin/sh
    #
    # Generate many of the vars and some classes used by cfengine

    # Function to do the printing for vars
    # first param is var name, second is value or use
    # the value of the first if no second is given
    function print_var () {
        echo =$1=${2:-${!1}}
    }

    # Function to do the printing for classes
    # first param is class name
    function print_class () {
        echo +$1
    }

    boot_partition=`df / | awk '/dev/ { print $1 }'`
    print_var boot_partition

And so on.

Sincerely,

Adrian Phillips

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