From: sto.mar@...
Date: 2013-03-29T06:35:00+09:00
Subject: Re: Find usb properties/details using ruby-dbus and udisk

Am 28.03.2013 19:49, schrieb sundar sundar:
> I am doing project in which i need to detect all available usb drives
> and its info. Mainly i am interested in USB device (flash drive and
> external hard disk), mount point, uuid, total size, available space,
> label, and is the usb mounted or not. I thought ruby-dbus would be
> better to go with udisk. So installed with out an error. However i am
> unable to proceed further. I need to use this on linux. Here is the
> sample code
>
> #!/usr/bin/env ruby
> require 'rubygems'
> require 'dbus'
> bus = DBus::SystemBus.instance
> rb_service = bus.service("org.freedesktop.UDisks")
> rb_udisk = rb_service.object("/org/freedesktop/UDisks")
> rb_udisk.introspect
> rb_udisk_iface = rb_udisk["org.freedesktop.UDisks.Device"]
> puts rb_udisk_iface.DeviceIsRemovable
>
> However i get this error
> undefined method `DeviceIsRemovable' for nil:NilClass (NoMethodError)
> which i don't understand. Could some one help me on this?

It means that `rb_udisk_iface' is nil and you are trying to call
`nil.DeviceIsRemovable' in your last line, which does not exist.

Seems rb_udisk["org.freedesktop.UDisks.Device"] returns nil
for some reason. Can't help you there, though.


> Useful links:-
> ruby-usb
> https://github.com/mvidner/ruby-dbus/blob/master/doc/Tutorial.md
> udisk
> http://udisks.freedesktop.org/docs/1.0.5/Device.html#Device:DeviceFile
> python and udisk
> http://mindbending.org/en/python-and-udisks-part-5
> http://stackoverflow.com/questions/5067005/python-udisks-enumerating-device-information
>
> Any help is appreciated.
>


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