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20040616: Question about pqact.conf



>From: "John R. Jackson" <address@hidden>
>Organization: Purdue
>Keywords: 200406162357.i5GNv6tK002466 LDM pqact.conf

JJ,

>I had my first experience setting up a pqact.conf entry and it took quite
>a bit of debugging print statements to figure out how I messed it up :-).
>
>All I wanted to do was grab all the CRAFT data products and drop them
>in a scratch disk.  Looking at the example pqact.conf file that got
>installed I came up with this:
>
>  CRAFT                "(.*)"
>       FILE    data/CRAFT/\1
>
>The first (very minor) problem was when I did a copy/paste of the command
>to check the syntax:
>
>  # su ldm -c 'ldmadmim pqactcheck'
>  ksh: ldmadmim:  not found
>
>Well, yeah, that's true :-).  It's a typo in the command name in the
>sample pqact.conf file comments (ldmadmim instead of ldmadmin).

OK, thanks for reporting this typo.  We will fix it in the next
LDM release.

>Anyway, to make a long story short, the examples in the file all use
>double quotes around the pattern, but I don't see anything in the code
>that removes them.  So they go into the regex and, of course, cause all
>the matches to fail so I was getting absolutely nothing.
>
>Is that a goof in the examples, or am I missing something?

It _is_ a goof in the examples, sorry.

>The example
>data products don't really have double quotes in their names, do they?

No.

>In any case, removing the double quotes from the above (and the parens
>which were not really needed) got everything working.  I also added
>"-close" to deal with the number of file descriptor issue.

Good move.  The '-close' option is important on many FILE actions.

>Just for curiosity, are there any likely patterns that would include
>whitespace, and how would you enter them if you cannot use quotes?

There are no patterns that use non-space white space in IDD product
headers.  This is the reason that the whitespace between the
feed name and the header matching regular expression must be a 
tab:

CRAFT   .*      FILE    data/CRAFT/\1

is actually:

CRAFT<tab>.*<tab>FILE<tab>data/craft/\1

which is equivalent to:

CRAFT<tab>.*
<tab>FILE<tab>data/craft/\1

which is equivalent to:

CRAFT<tab>.*
<tab>FILE
<tab>data/craft/\1

>It looks like spaces might be OK because the parser wants a tab between
>fields, so is the theory that we'll never see a data product with a
>tab in the name?

Yes, you will absolutely never see a tab in a product header.

>One would hope not :-), but it's just an end case I wondered about.

You have scoped things out exacly correctly.  Tabs are used for white
space everywhere except in regular expressions matching product headers.

Cheers,

Tom
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