soaplab-users

[Soaplab-users] shell builtin

[Sebastien M. <Seb...@un...>]

Hi,

Is there a way to use shell builtin (like type) as executable in 
application ?


It doesn't seem it works as other executable but maybe there is a way to 
get it.

Thanks

-- 
Sébastien Moretti
SIB, Quartier Sorge - Genopode
CH-1015 Lausanne, Switzerland
Tel.: +41 (21) 692 4056/4221

Re: [Soaplab-users] shell builtin

[Martin S. <mar...@gm...>]

> Is there a way to use shell builtin (like type) as executable in
> application ?


Not a straightforward way. Java does not support it (as far as I know) so
you have to write a wrapper script around your builtin.

The second option is to use application attribute 'method' in your ACD file.
For example, let's assume that you wish to execute builtin 'let' (that
returns an exit code depending on the evaluation of its parameters):

appl: HelloWorld [
  ...
  executable: "bash"
  comment: 'method -c "let ${greeting}"'
]

This works fine - try for example the command-lines (and see that the exit
code changes):

build/run/run-cmdline-client -name classic.helloworld -w -r -protocol local
greeting '1+1'
build/run/run-cmdline-client -name classic.helloworld -w -r -protocol local
greeting '1-1'

But this might be a security risk - a user can send anything and it is
evaluated by your bash. I recommend to use it with caution and only when
limited access is established.

Cheers,
Martin

-- 
Martin Senger
email: mar...@gm...,m.s...@cg...
skype: martinsenger

Re: [Soaplab-users] shell builtin

[Sebastien M. <Seb...@un...>]

>     Is there a way to use shell builtin (like type) as executable in
>     application ?
> 
> 
> Not a straightforward way. Java does not support it (as far as I know) 
> so you have to write a wrapper script around your builtin.
> 
> The second option is to use application attribute 'method' in your ACD 
> file. For example, let's assume that you wish to execute builtin 'let' 
> (that returns an exit code depending on the evaluation of its parameters):
> 
> appl: HelloWorld [
>   ...
>   executable: "bash"
>   comment: 'method -c "let ${greeting}"'
> ]
> 
> This works fine - try for example the command-lines (and see that the 
> exit code changes):
> 
> build/run/run-cmdline-client -name classic.helloworld -w -r -protocol 
> local greeting '1+1'
> build/run/run-cmdline-client -name classic.helloworld -w -r -protocol 
> local greeting '1-1'
> 
> But this might be a security risk - a user can send anything and it is 
> evaluated by your bash. I recommend to use it with caution and only when 
> limited access is established.
> 
> Cheers,
> Martin

I know it is a security issue but it is only for internal use, and only 
for type shell builtin which is more reactive than unix which command on 
our file system.

It works perfectly !

Thanks

-- 
Sébastien Moretti
SIB, Quartier Sorge - Genopode
CH-1015 Lausanne, Switzerland
Tel.: +41 (21) 692 4056/4221