| Dale Curtis | cb7bfaf | 2011-06-07 16:21:57 -0700 | [diff] [blame^] | 1 | def make_ssh_command(user='root', port=22, opts='', hosts_file=None, |
| 2 | connect_timeout=None, alive_interval=None): |
| 3 | """Override default make_ssh_command to use options tuned for Chrome OS. |
| 4 | |
| 5 | Tuning changes: |
| 6 | - ConnectTimeout=10; maximum of 10 seconds allowed for an SSH connection |
| 7 | failure. |
| 8 | |
| 9 | - ServerAliveInterval=60; which causes SSH to ping connection every |
| 10 | 60 seconds. In conjunction with ServerAliveCountMax ensures that if the |
| 11 | connection dies, Autotest will bail out quickly. |
| 12 | |
| 13 | - ServerAliveCountMax=1; only allow a single keep alive failure. |
| 14 | |
| 15 | - UserKnownHostsFile=/dev/null; we don't care about the keys. Host keys |
| 16 | change with every new installation, don't waste memory/space saving them. |
| 17 | """ |
| 18 | base_command = ('/usr/bin/ssh -a -x %s -o StrictHostKeyChecking=no' |
| 19 | ' -o UserKnownHostsFile=/dev/null -o BatchMode=yes' |
| 20 | ' -o ConnectTimeout=10 -o ServerAliveInterval=60' |
| 21 | ' -o ServerAliveCountMax=1 -l %s -p %d') |
| 22 | return base_command % (opts, user, port) |