E.g. if mkfs.xfs is not present, creating xfs filesystems is going to fail. Instead of letting the user try and report an error, it would be good if this information could be determined beforehand and reported in a way that lets gdu update its ui correspondingly.
For now distros should simply just add Requires: on the few known file systems that DeviceKit-disks pretends to know. In the future we can do more complicated stuff like having a special error code for missing file system driver and tools. Then clients can use PackageKit or whatnot to get the filesystem driver and tools installed. I'm going to repurpose this bug asking for a FilesystemNotSupported error to be returned in the appropriate places (mount, mkfs, set_label etc.).
*** This bug has been marked as a duplicate of bug 24718 ***
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