Expect command: Setting multi-line environment variable of host

Question

So I have an RSA token set in my environment variable. I want to set it in the environment of the remote machine. I tried this below script to set, but it only sets first line -----BEGIN OPENSSH PRIVATE KEY-----:

#!/usr/bin/expect -f

spawn ssh -tt ec2-user@$::env(EC2_INSTANCE)

send "export RSA_KEY=$::env(MY_KEY)\r"
expect -re ".*\$"

How can I set the whole content?

Answer 1

Put its value in single quotes:

send "export RSA_KEY='$::env(MY_KEY)'\r"
expect -re {.*\$}

Notice the {.*\$} instead of ".*\$"; Your ".*\$" will turn into .*$ and match anything, including the empty string.

If the MY_KEY environment variable can contain 's, you may want to escape them:

send "export RSA_KEY='[regsub -all {'} $::env(MY_KEY) {'\''}]'\r"
expect -re {.*\$}