UbuntuOne sync status emblems should apply to folders as well as files

[Matthew McGowan]

UbuntuOne should apply sync status emblems to folders as well as files.

[Roman Yepishev (rye)]

I would also note that the directories should display the summary status for all the files and folders that are contained within the folder in question. I.e. if at least one file is not synchronized, all the parent folders should show non-synchronized emblem.

This will require syncdaemon changes so that it may be queried somehow differently about the directory metadata which will trigger internal scan of the metadata to determine if there are non-synchronized files.

Taking this to ubuntuone-nautilus is way too expensive, since we might need to issue thousands of requests to get_metadata() effectively spamming the DBus and some of they will time-out.

[Roman Yepishev (rye)]

We might handle this in the following way:

When a request is made for u1-managed directory, syncdaemon is called with 'get_folder_info'-like request. This should trigger internal syncdaemon lookup to determine whether all files have been synced ("synchronized" emblem), whether at least one is downloaded in any folder below the current one or, if neither case fits, then folder is considered unsynchronized. All parent folders will then adjust their icons accordingly (since we have a cache of all observed files/folders anyway now.

This will allow Ubuntu One root folder to signal nicely about current syncdaemon state.

[Roman Yepishev (rye)]

Is it possible to add some kind of metadata key for the folders that is updated whenever something is changed in the subdirectory? This would save us hundreds of dbus calls.