Re: [HTCondor-users] Python and Requirements in a ClassAd

[Brian Bockelman <bbockelm@xxxxxxxxxxx>]

Hi Steve,

You are giving the ad a string object which becomes a string in the ad; what you want is an expression object which becomes an expression in the ad.  Try:

ad['Requirements'] = classad.ExprTree("TARGET.Machine =?= %s" % classad.quote("foo"))

Note that you want to use "classad.quote" instead of feeding an unsanitized string.  For example, what happens if the machine name includes a "?  In that case, using the quote function, you get:

>>> import classad
>>> ad = classad.ClassAd()
>>> ad['Requirements'] = classad.ExprTree("TARGET.Machine =?= %s" % classad.quote('f"oo'))
>>> ad
[ Requirements = TARGET.Machine is "f\"oo" ]

Hope this helps,

Brian

On May 13, 2014, at 5:01 PM, Stephen Pietrowicz <srp@xxxxxxxxxxxx> wrote:

> Hi,
> 
> I'd like to use the Python binding to submit a job. I've successfully submitted jobs while altering the class ad before submitting, and that works. works.
> 
> Now I'm trying to add Requirements to the class ad and ran into a problem.
> 
> A line like this in code:
> 
>            ad["Requirements"] = 'TARGET.Machine == "%s"' % machine
> 
> The Requirements expression for your job is:
> 
>    "TARGET.Machine == \"somemachine.ncsa.uiuc.edu\"" && TARGET.OPSYS == "LINUX" &&
>    TARGET.ARCH == "X86_64" &&
>    TARGET.FileSystemDomain == MY.FileSystemDomain &&
>    TARGET.Disk >= RequestDisk && TARGET.Memory >= RequestMemory
> 
> Note the extra set of quotes around the machine expression.
> 
> What's the right syntax for adding this?  I'd also like to add the slot number, but I simplified the problem for this email.  I think I'm missing something pretty basic here.
> 
> Any help would be appreciated.
> 
> Steve
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