Re: [HTCondor-users] Complex conditionals in Configuration

[John M Knoeller <johnkn@xxxxxxxxxxx>]

The explanation for this is that $() expansions don't actually have a data type, they are all just text.   Some of them do evaluation, and expect that after evaluation, the result will have a specific type.

In your particular example $ENV(var) will not *add* quotes if var does not already have them.   $ENV() does not expect data of any specific type.

To give some examples

--- config fragment ---
EX1 = 1
EX2 = 2
EX3 = 1+2
TEMP = $INT(EX1), $INT(EX2), $INT(EX3)

> condor_config_val TEMP
1, 2, 3

TEMP is 1,2,3 because $INT() will look up EX1 and then evaluate that as and expression and print the result as an integer, then lookup EX2, and evaluate that, and so on.  The evaluation is a consequence of the way $INT() works. 

Contrast that with $ENV(), which does NOT evaluate what it looks up.

export EX1=1
export EX2=2
export EX3=1+2

--- config fragment ---
TEMP = $ENV(EX1), $ENV(EX2), $ENV(EX3)

> condor_config_val TEMP
1, 2, 1+2

The manual will say whether a $ expansion function will do evaluation after lookup. Some of the functions do, some do not.  $INT(), and $STRING() exist specifically to do evaluation and to format the result in a specific way. 

For instance, 

EX3 = 10+2
TEMP = $INT(EX3), $INT(EX2,%02x)

> condor_config_val TEMP
12, 0c

-tj

-----Original Message-----
From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> On Behalf Of Stanislav V. Markevich via HTCondor-users
Sent: Tuesday, June 7, 2022 4:10 PM
To: htcondor-users <htcondor-users@xxxxxxxxxxx>
Cc: Stanislav V. Markevich <stanislav.markevich@xxxxxxxxxxxxxx>
Subject: Re: [HTCondor-users] Complex conditionals in Configuration

Hi John,

thank you for your reply, it works fine than MY_CONDITION is a string literal. It surprised me that if I want to get the value of MY_OPTION from an environment variable I have to wrap it in quotes:
  
  MY_OPTION = "$ENV(MY_OPTION_IN_ENV)"

without quotes I get the following:

ERROR "$INT() macro: one == "one" does not evaluate to an integer!" at line 3463 in file /htcondor/src/condor_utils/config.cpp

I expected that $ENV evaluates to a string.


Best regards,
Stanislav Markevich

----- Original Message -----
From: "John M Knoeller" <johnkn@xxxxxxxxxxx>
To: "htcondor-users" <htcondor-users@xxxxxxxxxxx>
Sent: Monday, 6 June, 2022 16:38:07
Subject: Re: [HTCondor-users] Complex conditionals in Configuration

You need to use a temporary variable to hold the condition, and then use $EVAL or $INT when you reference it,  like this.

MY_CONDITION = $(MY_OPTION) == "one"
if $INT(MY_CONDITION)

The limitation here is that the $() expansion parser doesn't allow a $ inside the body of a $() or $func() macro reference, so you need to set things up so that is avoided.   To assist in this $INT(), $STRING() and $EVAL() expect their argument to be a variable that contains an expression, not the expression itself. 

-tj

-----Original Message-----
From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> On Behalf Of Stanislav V. Markevich via HTCondor-users
Sent: Sunday, June 5, 2022 4:10 PM
To: htcondor-users@xxxxxxxxxxx
Cc: Stanislav V. Markevich <stanislav.markevich@xxxxxxxxxxxxxx>
Subject: [HTCondor-users] Complex conditionals in Configuration

Hello all,

I'm trying to check value of some macro in a condition and cannot understand how should I do it.

If the macro evaluates to a simple boolean value (true, false, 0, 1, etc) there is no problem. But what if I want to compare with other values?

For example, I want to check if $(MY_OPTION) evaluates to the value "one". I cannot just write

   if $(MY_OPTION) == "one"
     ...

because of complex conditionals are not supported. So I have somehow evaluate this expression and put the result into some other macro, but how can I do it?

I tried

MY_CONDITION = $EVAL( $(MY_OPTION) == "one")
if $(MY_CONDITION)
  ...

and some other options but still get the same error "$(MY_CONDITION) is not a valid if condition because complex conditionals are not supported".


Any help would be greatly appreciated.



Best regards, 
Stanislav V. Markevich 
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