Unformatted devices cannot be resized

[vojtechtrefny]

Device is not resizable if the format is not resizable and the "default" DeviceFormat is not resizable.

[vpodzime]

Isn't this on purpose to prevent issues with resizing devices with unknown formats?

[vojtechtrefny]

Yes, this would require bigger changes in the DeviceFormat, probably creating some new "UnknownFormat" class for devices with some format (recognized by blkid) but without support in blivet, and maybe even some special "NoFormat" for devices without a format (or format not recognized by blkid, but I think we can safely say device is not formatted if blkid tells us there is nothing on it).

[dwlehman]

There is also this to differentiate between "blkid reported nothing" and "blivet chose DeviceFormat":

https://github.com/storaged-project/blivet/blob/3.1-devel/blivet/formats/__init__.py#L105

[dwlehman]

An unformatted device could also be removed/replaced as a workaround. This all to avoid the case of an angry careless person whose device containing some rare formatting was resized, causing data loss.