"motd" only for interactive shell sessions?

[Thomas Hartmann]

Hi all,

I am looking for a way, to add a "motd" to an interactive container
session - but only to shell ;)

Thing is, that I added a "motd" echo - e.g.,
%environment
echo "Welcome to this wonderful namespace"
(or could be a separate script in /.singularity/env)

which is fine and one is greeted by it when running it with
> singularity shell ... mycontainer

however, all other instantiations obviously also execute the echo
> singularity exec ... mycontainer /usr/bin/date
>> Welcome to this wonderful namespace
>> Thu Jan 24 16:08:29 UTC 201
which is a bit noisy.

So, I wonder if somebody knows a nice way to source certain things only
for 'shell'? :)

Cheers and thanks,
Thomas

[v]

What an awesome idea! Maybe try this?

From: ubuntu:16.04
Bootstrap: docker

 

%post
   sed -i '2iecho HELLO MY DEAREST NOODLE' /.singularity.d/actions/shell

Then shell:

$ singularity shell container.simg Singularity: Invoking an interactive shell within container...
HELLO MY DEAREST NOODLE
Singularity container.simg:/tmp> 

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Vanessa Villamia Sochat
Stanford University '16

(603) 321-0676

[v]

This is like, the most fun idea! I am running to a meeting but I'm going to write up some other fun motd things you can do with containers :) I'll share a bit later!

[Thomas Hartmann]

ah, very nice!

yes, the shell section really looks quite promising to add more fun ;)

just for starters a boring info header
> echo -e "Welcome to container based on $(/bin/cat
/etc/redhat-release)\nfor more information you can also run\n
'singularity help container.path"

probably I will add jq or so and spice up the motd with the build date
from /.singularity.d/labels.json

Cheers & many thanks!
Thomas

> <mailto:singularity%2Bunsu...@lbl.gov>.

>
>
>
> --
> Vanessa Villamia Sochat
> Stanford University '16
> (603) 321-0676
>
>
>
> --
> Vanessa Villamia Sochat
> Stanford University '16
> (603) 321-0676
>

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[Thomas Hartmann]

ah, blasted - RH6 jq is to old and apparently has no way to deal with
dots in JSON object names.... :-/

> /.singularity.d/labels.json | jq '."org.label-schema.build-date"'
or similar all displease ancient jq

back to grep & cut ...

[Justin Cook]

Thomas,

From the jq website:

"jq is written in portable C, and it has zero runtime dependencies. You can download a single binary, scp it to a far away machine of the same type, and expect it to work."

https://stedolan.github.io/jq/

Perhaps that helps?

Justin

>> <mailto:singularity+unsub...@lbl.gov>.
>

[Thomas Hartmann]

thanks - but luckily the json is not as complex and cut/grep was a
portable quick&dirty solution ;)

> >>     <thomas....@desy.de <javascript:> <mailto:thomas....@desy.de

> >>         it, send an email to singularity...@lbl.gov <javascript:>
> >>         <mailto:singularity%2Bunsu...@lbl.gov <javascript:>>.

> >>
> >>
> >>
> >>     --
> >>     Vanessa Villamia Sochat
> >>     Stanford University '16
> >>     (603) 321-0676
> >>
> >>
> >>
> >> --
> >> Vanessa Villamia Sochat
> >> Stanford University '16
> >> (603) 321-0676
> >>
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> >> You received this message because you are subscribed to the Google
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