Re: [Lmod-users] When using depends_on, setenv via a function is not unset by unload

[Robert M. <mc...@ta...>]

Yes, but you still need the os.getenv("FOO") or "" bit or you'll get the
error about having a non-string argument.

Robert.


On Wed, Aug 26, 2020 at 5:44 PM Maxime Boissonneault <
max...@ca...> wrote:

> I would add to that, since I encountered this very issue recently, that
> "pushenv" can be used in this situation.
>
> Best,
>
> Maxime
> Le 20-08-26 à 18:36, Robert McLay a écrit :
>
> Lmod does what you tell it to do.  The depends_on("cuda") unloads the cuda
> module if it thinks it should. That is, if there are no other modulefiles
> dependent on cuda.  So if it unloads the cuda module and it unsets
> CUDA_HOME, then of course os.getenv("CUDA_HOME") is going to return a nil,
> which is not a string.  Lmod requires that setenv(A,B) that both arguments
> are strings.   A simple way to fix your modulefile is to do:
>
>     local cuda_home = os.getenv("CUDA_HOME") or ""
>     setenv("THINGY", cuda_home)
>
> Best,
> Robert.
>
>
>
> On Wed, Aug 26, 2020 at 1:38 PM Shelly Johnson <js...@um...> wrote:
>
>> Suppose I have a module, hello, that depends_on('cuda/11.0.2').  I was
>> hoping to be able to use something like
>>
>> #-----------------------------
>> local installDir   = "/sw/arcts/centos7/hello/1.0"
>> local app          = "hello"
>> depends_on('cuda/11.0.2')
>> local cuda_home = os.getenv('CUDA_HOME')
>> setenv('THINGY', cuda_home)
>> #-----------------------------
>>
>> That seems to work, so long as the cuda/11.0.2 module is already
>> loaded when I load hello/1.0.  That is, when cuda/11.0.2 was not
>> loaded by depends_on().
>>
>> If the cuda/11.0.2 module is not loaded when hello/1.0 gets loaded,
>> then upon unloading hello, I get
>>
>> Lmod Warning:  Syntax error in file: /home/bennet/Lmod/hello/1.0.lua
>>  with command: setenv, one or more arguments are not strings.
>>
>> So, it seems that it might be unloading the module on which hello
>> depends before unsetting the variables that hello sets, leading to the
>> os.getenv('CUDA_HOME') not getting properly evaluated.  Would it not
>> be better to unset while the depended upon module was still active?
>>
>> This seems like it could be a bug.
>>
>> Thanks!
>> Shelly
>>
>> Shelly Johnson
>> Research Applications Specialist
>> XSEDE Campus Champion
>> Advanced Research Computing - TS
>> University of Michigan
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>>
>
>
> --
> Robert McLay, Ph.D.
> Manager of Software Tools, HPC
> mc...@ta...
>
>
>
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>

-- 
Robert McLay, Ph.D.
Manager of Software Tools, HPC
mc...@ta...