bootstrapping talks to the remote machine one character at a time

[Dave Cheney]

Attempting to connect to 54.79.178.105:22
Attempting to connect to 10.251.56.24:22
2016-02-09 01:43:24 DEBUG juju.provider.common bootstrap.go:318 connection attempt for 54.79.178.105 failed: Warning: Permanently added '54.79.178.105' (ECDSA) to the list of known hosts.
/var/lib/juju/nonce.txt does not exist
2016-02-09 01:43:30 DEBUG juju.provider.common bootstrap.go:318 connection attempt for 54.79.178.105 failed: /var/lib/juju/nonce.txt does not exist
2016-02-09 01:43:36 DEBUG juju.utils.ssh ssh.go:249 using OpenSSH ssh client

^ after this point the local juju binary sends some data to the shell on the other side. This happens _one_ _character_ _at_ _a_ _time_, consuming minutes of wall time, and gallons of CPU for the ssh overhead.

[Dave Cheney (dave-cheney)]

Stdin is coming in one character at a time

read(0, "e", 1) = 1
read(0, "H", 1) = 1
read(0, "t", 1) = 1
read(0, "D", 1) = 1
read(0, "N", 1) = 1
read(0, "y", 1) = 1
read(0, "q", 1) = 1
read(0, "5", 1) = 1
read(0, "g", 1) = 1
read(0, "H", 1) = 1
read(0, "/", 1) = 1
read(0, "S", 1) = 1
read(0, "o", 1) = 1
read(0, "5", 1) = 1
read(0, "t", 1) = 1
read(0, "6", 1) = 1
read(0, "C", 1) = 1

[Andrew Wilkins (axwalk)]

https://github.com/juju/juju/pull/4349