It occurs to me: sudo tries to do the right thing by reading the password from /dev/tty. If a natural enhancement were made to SSH, the right thing would happen. When the SSH client has a controlling terminal but its stdin and stdout are not connected to that terminal, the server should give the remotely executed process a controlling terminal in addition to stdin and stdout. The server should forward reads and writes of this terminal to the SSH client's controlling terminal.
I think I will propose this enhancement on the OpenSSH mailing list. It would fix --rsh="ssh middle ssh" as well as --rsync-path="sudo rsync". Matt -- To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
