how can I do a linux mount in a programmatic way ?

[Jedrin]

If I do something like system('sudo mount .. ') then I don't really
get any error codes back to see what happened because I just get the
sudo return code here. Is there a way to do this like a library call
in ruby ?

 

[Iñaki Baz Castillo]

El Martes, 27 de Octubre de 2009, Jedrin escribi=F3:

If I do something like system('sudo mount .. ') then I don't really
get any error codes back to see what happened because I just get the
sudo return code here. Is there a way to do this like a library call
in ruby ?
=20

Use open4 (gem install open4):

=2D------------------
require "open4"

pid, stdin, stdout, stderr =3D Open4:open4("sudo mount...")
ignored, status =3D Process::waitpid2 pid

if status.to_i !=3D 0
puts "Error: Command returned #{status.to_i}""
end
=2D--------------------

You can also inspect the output and error output reading stdout and stderr=
=20
(they are IO objects, no strings).

=2D-=20
I=F1aki Baz Castillo <[email protected]>

 

[Brian Candler]

If I do something like system('sudo mount .. ') then I don't really
get any error codes back to see what happened because I just get the
sudo return code here.

I think you should get the exit status of the program which sudo ran:

$ cat xxx.sh
exit 123
$ irb --simple-prompt
[Ubuntu Hardy, sudo 1.6.9p10-1ubuntu3.5]

Otherwise, I don't know if there's a way to call the mount API directly
from ruby.

Even if there was, remember that it wouldn't work unless the ruby script
itself were running as root. That is: if you need 'sudo' to get root as
in your original example, then it's always going to be in a separate
process.