Here is another question (maybe this is more a bug):
Rebasing is a long operation, so inevitably my laptop will suspend halfway through. When it resumes, the rpm-ostree rebase operation running inside my vm never continues downloading - it just sits there, despite an operational network connection. When I eventually hit Ctrl-C, it takes a very long time (like a minute, at least) to actually stop, telling me to wait for it to cancel its transaction. The wait seems excessive...
Not sure about the "never doing anything after suspend" part. Maybe that is something we can look at.
Regarding CTRL-C not working, you are probably hitting https://github.com/projectatomic/rpm-ostree/issues/897. Where it's actually an underlying library that is taking control of the signal handling. It would be nice to get that fixed somehow.