* gnu/machine.scm (machine-system): Delete variable. (machine-operating-system): New variable. All callers changed. * doc/guix.texi (Invoking guix deploy): Use the 'machine-operating-system' accessor rather than 'machine-system'.
* gnu/machine.scm: New file. * gnu/machine/ssh.scm: New file. * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.