Re: [Lmod-users] adding hooks to modules

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

I have added support for TCL modulefiles to use the system command.   This
change has been pushed to the github repo( github.com/TACC/lmod) if you
would like to try it.  Please let me know if it works for you.


R.



On Thu, Aug 29, 2013 at 8:41 PM, Robert McLay <mc...@ta...> wrote:

> About your question about system function for TCL modules.   It is true
> that is not supported by the current version of lmod.  You can use the
> "execute" function inside of a lua modulefile.  I think that it is possible
> tcl modulefile could translate the "system" TCL function to use the
> "execute" function but I'll have to think about how.
>
> Lmod already has support for tracking module usage. All you need do is
> define the load_hook function in your "SitePackage.lua" file.   If you set
> "LMOD_PACKAGE_PATH" to point to the directory that contains your
> "SitePackage.lua" file you can use the load_hook function.  Below is an
> example SitePackage.lua that uses the "logger" command to write to the
> syslog daemon.
>
> *Important node:  If you put this function in SitePackage.lua ( and
> modify it to suit your needs).  You DO NOT need to change a single line in
> any modulefile.  This will work with both lua and TCL modulefiles.*
>
> require("strict")
> require("string_split")
> local hook      = require("Hook")
> local getenv    = os.getenv
> local concatTbl = table.concat
>
> local function load_hook(t)
>    -- t is a table containing:
>    -- t.modFullName:   Full name of the Module,
>    -- t.fn:            the path of the modulefile.
>
>    local lmod_logger_list = getenv("LMOD_LOGGER_LIST")
>
>    -- Suppose that LMOD_LOGGER_LIST contained Key name , Env Name
>    -- For example:
>    --   LMOD_LOGGER_LIST: "U,USER:H,HOSTNAME:ID,PBS_JOBID"
>
>    local a   = {}
>
>    a[#a+1] = "M"  .. t.modFullName
>    a[#a+1] = "FN" .. t.fn
>
>    for keyName in split(":") do
>       local _, _, key, name = keyName:find("(.*),(.*)")
>       local value = getenv(name)
>       if (value) then
>          a[#a+1] = key .. value
>       end
>    end
>    local s = concatTbl(a," ")  --> "M${module} FN${fn} U${user}
> H${hostname} ID${pbs_id}"
>
>    local cmd = "logger -t lmod -p local0.info " .. s
>    os.execute(cmd)
> end
>
> hook.register("load",           load_hook)
>
> -------------------------------
>
> In the above code (in SitePackage.lua),  You have set the environment
> variable LMOD_LOGGER_LIST to be
>
>     U,USER:H,HOSTNAME:ID,PBS_JOBID
>
> So  the format is Key name (U) COMMA , environment variable name (USER).
>  This code reads the environment variable and parses it.  If the
> environment variable has a value then it gets added to the logger output.
> This way if you have use the same trick to record interactive and batch
> jobs,  PBS_JOBID won't have a value when interactive.    This will load
> hook will be called on every module that gets loaded.  You get the module
> name and modulefile for "free".
>
>
>
> On Thu, Aug 29, 2013 at 2:19 PM, Jiří Machala <ma...@ma...>wrote:
>
>> Hello everybody,
>> I've been trying lmod some more and I'd like to add some hooks to log
>> which
>> modules use our users most and maybe for checking some user permissions
>> etc
>> (when I think about it now, adding some variables for architecture etc,
>> would
>> also be nice).
>>
>> My idea is we would add to lmod some script and whenever "module load" was
>> called, this script would be called and the name of module would be
>> passed to
>> it.
>>
>> What do you think would be the best way to do it? Or do you think there is
>> some completly other better way to achive the same goal?
>>
>> On unrelated note:
>> in a couple of our TCL modules we use command "system" and it seems to be
>> unimplemented, I suppose it would be easiest to just rewrite it to lua,
>> wouldn't it?
>>
>> Jiri Machala,
>> tech support at MetaCentrum VO(metavo.metacentrum.cz)
>>
>>
>> P.S.:
>> sorry for possible duplicate message, I sent it first from the wrong mail
>> address
>>
>>
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>
>
>
> --
> Robert McLay, Ph.D.
> TACC
> Manager, HPC Software Tools
> (512) 232-8104
>
>


-- 
Robert McLay, Ph.D.
TACC
Manager, HPC Software Tools
(512) 232-8104