zfs receive does not work if the destination filesystem has been changed since the most recent snapshot

[ddebeau]

Error:

cat 20210607_020000.inc | zfs receive <filesystem>@20210607_020000
cannot receive incremental stream: destination <filesystem> has been modified
since most recent snapshot

zfsup restore <filesystem> 20210607_020000 doesn't return anything. If you wrap the restore command in a try except statement you'll get a BrokenPipeError. We'll want to catch that and let the user know what the problem likely is. The -F option forces a rollback to the most recent snapshot. We should add an option for that.

[ddebeau]

I've found that sometimes it returns a BrokenPipeError and other times it doesn't and the error is correctly read from stderr.