-distro option
+--gpg= etc. @gpg should be in manual
+should pass @gpg to debsign
+--ssh= etc. @ssh should be in manual
+support SSH and DGIT_SSH
+--dgit= etc. @dgit should be in manual
+
+approach for remote signing
+ - initiator acts as oracle for responder
+ - one of each operation
+ - debsign: copy up changes and dsc, run debsign on initiator, copy down
+ - git tag: generate tag contents on initiator
+
+protocol:
+ - responder sends parsed changelog
+ - responder sends changelog
+ - responder sends dsc
+ - responder sends head commit hash