1#!/usr/bin/expect
2# usage: expect_scp <remote-ip-addr>:<remote-path> <local-path>
3
4# Sometimes, the network connection time may be more than the default
5# timeout duration of expect, i.e., 10 seconds. Hence, set a longer timeout.
6set timeout 20
7
8set local_path [lindex $argv 1]
9set remote_path [lindex $argv 0]
10spawn scp -r -o StrictHostKeyChecking=no -o UserKnownHostsFile="/tmp/null" \
11      "$local_path" "$remote_path"
12
13# The prompts from the remote machine are not deterministic.
14# For example, it may prompt (yes/no) for 0, 1, or even 2 times;
15# it may or may not prompt the user for a password, etc.
16# We used a loop to handle various combinations of such possibilities.
17expect {
18  # The remote machine has closed the connection.
19  eof {
20    puts "Has copied the .version file to the remote machine."
21    exit 0
22  }
23
24  # The scp connection times out.
25  timeout {
26    send_error "Error: scp timeout!";
27    exit 1
28  }
29
30  -nocase "(yes/no)?" {
31    send "yes\r";
32    exp_continue
33  }
34
35  -nocase "password:" {
36    send "test0000\r";
37    exp_continue
38  }
39
40  -nocase "Permanently added" {}
41
42  # This exception may occur when the .version file was not created for any
43  # reason. This causes the spawned process for scp to abort and thus
44  # this script was killed in a cascaded way.
45  -nocase "killed by signal" {
46    send_error "Error: the spawned scp process was killed.\n";
47    exit 1
48  }
49
50  # This exception may occur when the machine IP is incorrect.
51  -nocase "lost connection" {
52    send_error "Error: lost connection to the chromebook machine.\n";
53    exit 1
54  }
55}
56