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Add 4.0 content to usage of qubes-usb-proxy

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Also set "What if I removed the device before detaching it from the VM?" to R3.2 because procedure should be unnecessary under 4.0 and attempting it on 4.0 results in "libxl: error: libxl.c:2233:device_disk_add: device already exists in xenstore".
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common-tasks/usb.md
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@ -200,7 +200,7 @@ manually. The device will show up as `/dev/xvdi` (or `/dev/xvdj` if there is
already one device attached -- if two, `/dev/xvdk`, and so on).
### What if I removed the device before detaching it from the VM? ###
### What if I removed the device before detaching it from the VM? (R3.2) ###
Currently (until issue [1082] gets implemented), if you remove the device
before detaching it from the qube, Qubes OS (more precisely, `libvirtd`) will
@ -219,7 +219,7 @@ steps:
[user@dom0 ~]$ qvm-block
sys-usb:sda DataTraveler_2.0 () 246 MiB (attached to 'testvm' as 'xvdi')
[user@dom0 ~]$ xl block-attach testvm phy:/dev/sda backend=sys-usb xvdi
[user@dom0 ~]$ sudo xl block-attach testvm phy:/dev/sda backend=sys-usb xvdi
In above example, all `xl block-attach` parameters can be deduced from the
output of `qvm-block`. In order:
@ -260,7 +260,52 @@ you want to attach the USB device to.
- Fedora: `sudo dnf install qubes-usb-proxy`
- Debian/Ubuntu: `sudo apt-get install qubes-usb-proxy`
### Usage of qubes-usb-proxy ###
### Usage of qubes-usb-proxy (R4.0) ###
This feature is also available from the Devices Widget. This is the tool tray
icon with a yellow square located in the top right of your screen by default.
Simply insert
your USB device and click on the widget. You will see an entry for your device
such as `sys-usb:2-5 - 058f_USB_2.0_Camera` for example.
Hover over it.
This will pop up a submenu showing running VMs to which the USB device can be connected.
Click on one and your device will be attached! You may also use the command line:
Listing available USB devices:
[user@dom0 ~]$ qvm-usb
sys-usb:2-4 04ca:300d 04ca_300d
sys-usb:2-5 058f:3822 058f_USB_2.0_Camera
sys-usb:2-1 03f0:0641 PixArt_HP_X1200_USB_Optical_Mouse
Attaching selected USB device:
[user@dom0 ~]$ qvm-usb attach conferences sys-usb:2-5
[user@dom0 ~]$ qvm-usb
conferences:2-1 058f:3822 058f_USB_2.0_Camera
sys-usb:2-4 04ca:300d 04ca_300d
sys-usb:2-5 058f:3822 058f_USB_2.0_Camera (attached to conferences)
sys-usb:2-1 03f0:0641 PixArt_HP_X1200_USB_Optical_Mouse
Now, you can use your USB device (camera in this case) in the `conferences` qube.
If you see the error `ERROR: qubes-usb-proxy not installed in the VM` instead,
please refer to the [Installation Section][installation].
When you finish, detach the device. This can be done in the GUI by
clicking on the Devices Widget. You will see a bolded entry for your device
such as `sys-usb:2-5 - 058f_USB_2.0_Camera` for example.
Hover over it.
This will pop up a submenu showing running VMs. The one which your device is
connected to will have an Eject button next to it. Click that and your device
will be detached. You may also use the command line:
[user@dom0 ~]$ qvm-usb detach sys-usb:2-5
[user@dom0 ~]$ qvm-usb
sys-usb:2-4 04ca:300d 04ca_300d
sys-usb:2-5 058f:3822 058f_USB_2.0_Camera
sys-usb:2-1 03f0:0641 PixArt_HP_X1200_USB_Optical_Mouse
### Usage of qubes-usb-proxy (R3.2) ###
Listing available USB devices:
@ -290,7 +335,7 @@ When you finish, detach the device:
sys-usb:2-5 058f:3822 058f_USB_2.0_Camera
sys-usb:2-1 03f0:0641 PixArt_HP_X1200_USB_Optical_Mouse
This feature is not yet available in Qubes Manager however, if you would like to contribute to Qubes OS project by implementing it and are a student please consider applying for the [Google Summer of Code][gsoc-page] scholarship and choosing QubesOS Project as a mentor organization. You can find list of our our Project Ideas [here][project-page].
This feature is not available in Qubes Manager.
Creating and Using a USB qube
-----------------------------
@ -494,8 +539,6 @@ sys-usb dom0 ask,default_target=dom0
[1618]: https://github.com/QubesOS/qubes-issues/issues/1618
[create a USB qube]: #creating-and-using-a-usb-qube
[usb-challenges]: https://blog.invisiblethings.org/2011/05/31/usb-security-challenges.html
[project-page]: /gsoc/
[gsoc-page]: https://summerofcode.withgoogle.com/organizations/6239659689508864/
[YubiKey]: /doc/YubiKey/
[Security Warning about USB Input Devices]: #security-warning-about-usb-input-devices
[qubes-usb-proxy]: https://github.com/QubesOS/qubes-app-linux-usb-proxy