Use your browser to automatically log in to fly

login-fly.sh

login-fly ()
{
    expect <(cat <<EOF
    spawn fly -t credhub login
    expect "1: GitHub"
    send -- "1\r"

    expect -re "https://.*fly_local_port=\[0-9\]*"
    set url [ string map { "\&" "\\\&" } \$expect_out(0,string) ]
    system open \$url

    expect eof
EOF
  )
}