Audio CDs are special, in that they don’t (usually) have any data
partitions. They also don’t have a volume label. They just have
tracks.
Before this patch, we ignored all optical mediums that did *not* have
a filesystem (that includes audio CDs).
Now, instead of using the ID_FS_USAGE property to determine whether
there’s media present in the CD-ROM or not, we use the
ID_CDROM_MEDIA. This property is set to ‘1’ for both audio CDs and
data CDs.
Then, we read the ID_CDROM_MEDIA_TRACK_COUNT_AUDIO property to
determine how many audio tracks there are.
If the CD has a filesystem, we treat it as a data CD, and use the
already existing add_partition() function to track it.
If the CD does _not_ have a filesystem, but it _does_ have at least
one audio track, we treat it as an audio CD and use the new
add_audio_cd() function to track it.
This function is almost identical to add_partition(), but instead of
reading the ID_FS_LABEL property, it reads the
ID_CDROM_MEDIA_TRACK_COUNT_AUDIO property and synthesizes a label on
the form “Audio CD - N tracks”.
Finally, a new boolean tag, “audio”, has been added. It is set to true
for audio CD “partitions”, and to false in all other cases.
Set to true for empty (no windows) workspaces.
Mostly useful with persistent workspaces, to be able to differentiate
between invisible non-empty workspaces and actually empty
workspaces (the latter not being possible with non-persistent
workspaces).
This fixes an issue where we sometimes failed to retrieve the SSID; we
sent one initial request before the family ID had been set.
Then, we received the family ID and tried to send another
request. However, if the first request was still in progress, the
second request was never made.
Since the first request lacked the family ID, that response didn’t
contain anything useful.
