Kevin McCormick 720754a504 ssh mode: use forced backup-zfs-shell ...

Ensure the backup connection to the SSH server can't do anything other
than designed. Uses ssh's authorized_keys command= statement to launch
backup-zfs-shell, which then supports only the handful of operations
required to perform backups.

$destpath is no longer used, but still included in the documentation
until it can be entirely written out.

2017-03-09 12:08:50 -08:00

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