Deprecate v0.6 and older filesystems in v1.0

[rfjakob]

My current plan is to drop support for filesystems created by gocryptfs v0.6 and older in gocryptfs v1.0. This will get rid of a lot of compatibility code and keep the gocryptfs codebase clean and maintainable. Also, users of <= v0.6 filesystems are missing at least one security improvement (128 bit GCM IVs).

I have created a wiki page showing the compatibility matrix: https://github.com/rfjakob/gocryptfs/wiki/Compatibility

Opinions? Disagreement?

[kofalt]

No objections, assuming that the upgrade path of mounting a newer binary and copying data over still works! 👍

[rfjakob]

Upgrade guide added to the wiki: https://github.com/rfjakob/gocryptfs/wiki/Upgrading

[rfjakob]

v1 has been released, this is done.