How to correctly use spawn-expect-send for 'git push'?

Question

The code below is adapted from a solution to "Use Expect in a Bash script to provide a password to an SSH command", so as to pass arguments to git push. I'm not getting any exceptions for passing the wrong uname+pwd, and conversely passing the correct ones does not actually push anything. How can this be corrected?

git_push.sh

if (( $# == 2 ))
then
    :
else
    echo "expecting 'username pass', got $@"
    exit 1
fi

user="$1"
pass="$2"
expect - <<EOF
 spawn git push
 expect 'User*'
 send "$user\r"
 expect 'Pass*'
 send "$pass\r"
EOF

Terminal:

$ [path]/git_push.sh
spawn git push
Username for 'https://github.com': foo
Password for 'https://[email protected]': 

---

Alternatively (no wildcards):

 spawn git push
 expect "Username for 'https://github.com': "
 send "$user\r"
 expect "Password for 'https://[email protected]': "
 send "$pass\r"

Answer 1

To address the expect questions:

expect - <<EOF
 spawn git push
 expect 'User*'
 send "$user\r"
 expect 'Pass*'
 send "$pass\r"
EOF

1. single quotes have no special meaning in expect, so you are looking for literal single quotes in the User and Pass prompts. Those prompt will not contain single quotes, so the expect command hangs until the timeout (default 10 seconds) happens.

2. after you send the password, you don't wait for the push to complete: the expect script runs out of commands to run and exits too early, killing the git process. After any send, you should expect something. In this case, you're expecting the spawned command to end which is denoted with expect eof

expect - <<_END_EXPECT
    spawn git push
    expect "User*"
    send "$user\r"
    expect "Pass*"
    send "$pass\r"
    set timeout -1  ; # no timeout
    expect eof
_END_EXPECT