[Lvfs-announce] Adding an optional install duration to LVFS firmware

Hi,

We've just added an *optional* feature to fwupd and the LVFS that some
OEMs might find useful: The firmware update process can now tell the
user how long in seconds the update is going to take.

This means that users can know that a dock update might take 5
minutes, and so they start the update process before they go to lunch.
A UEFI update will require multiple reboots and will take 45 minutes
to apply, and so the user will only apply the update at the end of the
day rather than losing access to the their computer for nearly an
hour.

If you want to use this feature there are currently three ways to
assign the duration to the update:

 * Changing the value on the LVFS admin console -- the component
update panel now has an extra input field to enter the duration in
seconds

 * Adding a new attribute to the <release> element, for instance:

    <release urgency="high" version="3.0.2" date="2017-02-09"
install_duration="120">

 * Adding a 'quirk' to fwupd, for instance:

[DeviceInstanceId=USB\VID_1234&PID_5678]
InstallDuration = 40

For updates requiring a reboot the install duration should include the
time to POST the system both before and after the update has run, but
it can be approximate. Only users running very new versions of fwupd
and gnome-software will be shown the install duration, and older
versions will be unchanged as the new property will just be ignored.
It's therefore safe to include in all versions of firmware without
adding a the dependency on a specific fwupd version.

Please continue to send me an email if you have any concerns or
questions about any aspect of the LVFS. Thanks.

Richard.