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=7f20e59a13a6acc3331e04185b8f1ed2538dcd0a'>machine: ssh: Open a single SSH session per machine....Previously, any call to 'managed-host-remote-eval' and similar would open a new SSH session to the host. With this change, an SSH session is opened once, cached, and then reused by all subsequent calls to 'machine-ssh-session'. * gnu/machine/ssh.scm (<machine-ssh-configuration>): Add 'this-machine-ssh-configuration'. [session]: Mark as thunked and change default value to an 'open-machine-ssh-session*' call. (open-machine-ssh-session, open-machine-ssh-session*): New procedures. (machine-ssh-session): Replace inline code by call to 'open-machine-ssh-session'. Ludovic Courtès 2021-06-03machine: ssh: Respect calling convention for monadic procedures....Fixes a regression introduced in 2885c3568edec35086f8feeae5b60259cbea407c. Reported by Mathieu Othacehe. * gnu/machine/ssh.scm (deploy-managed-host)[eval/error-handling]: Return two values in the standard case. Ludovic Courtès 2021-06-01machine: ssh: Gracefully handle failure of the effectful bits....Previously, '&inferior-exception' raised by 'upgrade-shepherd-services' and co. would go through as-is, leaving users with an ugly backtrace. * gnu/machine/ssh.scm (deploy-managed-host): Define 'eval/error-handling' and use it in lieu of EVAL as arguments to 'switch-to-system', 'upgrade-shepherd-services', and 'install-bootloader'. Ludovic Courtès