Dolphin Optical Disk context menu - "Release" function?

[Frank Reininghaus]

Hi,

2015-07-21 7:57 GMT+02:00 Bernard Gray:
> Hi All,
> I maintain an in-house live distribution based on Ubuntu 14.04.
> For some of our satellite branches, we still use optical disks for the boot
> media, with a copy-to-ram occuring during the initramfs process. This
> copy-to-ram process allows us to free up the optical drive for normal usage
> after boot -
>
> An issue we're experiencing though, is that after boot if I eject the
> optical disc drive, remove the boot disc and put a new data disc in - this
> data disc appears in the list of devices, normally, lets me choose a normal
> action to execute on it, but it appears empty when I try to browse it (or do
> anything with it).
>
> In order to make the contents of the disc visible, I have to right click on
> the optical disc icon in Dolphin, and choose "Release <disc name>"
> http://imgur.com/K0NLKBY
>
> Then I can browse the disc fine.
>
> My question is, what does this Release function do, and how can I execute
> that release as part of my boot process (ie outside of KDE) so I don't have
> to pass this non-intuitive step onto my users?
>
> I've dived into the dolphin source to try and get a handle on what is
> happening, but I don't have the Qchops to work out where the slot for that
> signal gets implemented - hence the question for this list.

I think that the functions

void PlacesItemModel::requestEject(int index)
void PlacesItemModel::requestTeardown(int index)

are the ones that are run when you safely remove or eject a device.
However, they are only thin wrappers for functionality that is
provided by the Solid library, and what this library does in detail
when these functions are called may depend on the Solid backend that
is used. I do not know what low-level system calls will be made by the
backend. Maybe you have to ask the Solid people if noone else on this
list has an idea.

Regards,
Frank