[9fans] p9p mk rc help

[9fans] p9p mk rc help

[dexen deVries]

Hi list,

apologies for the keyword overload ;-)

I have a plan9port mkfile using Rc (MKSHELL=$PLAN9/bin/rc), a recipe
contains pipeline: FOO_COMMAND | BAR_COMMAND.

What is the correct way of detecting failure exit status of
FOO_COMMAND (a networked operation) and ignoring exit status of
BAR_COMMAND?
the best i came up with is very ugly:

target: prereq
    FOO_COMMAND | BAR_COMMAND
    st = $status
    if (~ $st ?* ^ '|' ^ *) {
        echo FOO_COMMAND failed
        exit 3 }

seems the | in pattern has to be quoted, otherwise is interpreted as
pipe operator.

regards,
--
dx

Re: [9fans] p9p mk rc help

[erik quanstrom]

> target: prereq
>     FOO_COMMAND | BAR_COMMAND
>     st = $status
>     if (~ $st ?* ^ '|' ^ *) {
>         echo FOO_COMMAND failed
>         exit 3 }

i think there a bug in this.  a trailing ~ 1 1
or similar is necessary to clear the status from the if.

alternately, how about replacing the if with simply

	! ~ $st ?* ^ '|' ^ *

which should correctly set the status.

- erik

Re: [9fans] p9p mk rc help

[arnold]

> 	! ~ $st ?* ^ '|' ^ *

Sheesh. I'm a long time Unix type and even to *me* that looks like
line noise. :-)

Arnold

Re: [9fans] p9p mk rc help

[erik quanstrom]

On Wed Nov 20 10:57:46 EST 2013, arnold@skeeve.com wrote:
> > 	! ~ $st ?* ^ '|' ^ *
>
> Sheesh. I'm a long time Unix type and even to *me* that looks like
> line noise. :-)

	! ~ $status ?* ^ '|' ^ *

ah, sorry.  FTFY.

- erik

Re: [9fans] p9p mk rc help

[Tony Lainson]

> What is the correct way of detecting failure exit status of
> FOO_COMMAND (a networked operation) and ignoring exit status of
> BAR_COMMAND?

Perhaps something like this would work?

target:
    fn ignore { $* || status=() }
    foo | ignore bar

Tony