[PATCH v2 02/10] KVM test: Send the username in remote_login()

[Jason Wang <jasowang@redhat.com>]

In order to let the serial console work, we must let the
remote_login() send the username when met the username prompt. This
patch fails the progress if if it met the username prompt twice.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 client/tests/kvm/kvm_utils.py |   23 ++++++++++++++++-------
 1 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/client/tests/kvm/kvm_utils.py b/client/tests/kvm/kvm_utils.py
index 11f2b1a..2800fae 100644
--- a/client/tests/kvm/kvm_utils.py
+++ b/client/tests/kvm/kvm_utils.py
@@ -451,7 +451,7 @@ def check_kvm_source_dir(source_dir):
 # The following are functions used for SSH, SCP and Telnet communication with
 # guests.
 
-def remote_login(command, password, prompt, linesep="\n", timeout=10,
+def remote_login(command, username, password, prompt, linesep="\n", timeout=10,
                  prompt_assist=None):
     """
     Log into a remote host (guest) using SSH or Telnet. Run the given command
@@ -462,6 +462,7 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10,
     @brief: Log into a remote host (guest) using SSH or Telnet.
 
     @param command: The command to execute (e.g. "ssh root@localhost")
+    @param username: The username to send in reply to a username prompt
     @param password: The password to send in reply to a password prompt
     @param prompt: The shell prompt that indicates a successful login
     @param linesep: The line separator to send instead of "\\n"
@@ -471,6 +472,7 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10,
             password prompt, the shell prompt, etc)
     @param prompt_assist: An assistant string sent before the pattern
             matching in order to get the prompt for some kinds of shell_client.
+            
     @return Return the kvm_spawn object on success and None on failure.
     """
     sub = kvm_subprocess.kvm_shell_session(command,
@@ -478,6 +480,7 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10,
                                            prompt=prompt)
 
     password_prompt_count = 0
+    login_prompt_count = 0
 
     logging.debug("Trying to login with command '%s'" % command)
 
@@ -505,9 +508,15 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10,
                 sub.close()
                 return None
         elif match == 2:  # "login:"
-            logging.debug("Got unexpected login prompt")
-            sub.close()
-            return None
+            if login_prompt_count == 0:
+                logging.debug("Got username prompt; sending '%s'" % username)
+                sub.sendline(username)
+                login_prompt_count += 1
+                continue
+            else:
+                logging.debug("Got username prompt again")
+                sub.close()
+                return None
         elif match == 3:  # "Connection closed"
             logging.debug("Got 'Connection closed'")
             sub.close()
@@ -644,7 +653,7 @@ def ssh(host, port, username, password, prompt, linesep="\n", timeout=10):
     command = ("ssh -o UserKnownHostsFile=/dev/null "
                "-o PreferredAuthentications=password -p %s %s@%s" %
                (port, username, host))
-    return remote_login(command, password, prompt, linesep, timeout)
+    return remote_login(command, username, password, prompt, linesep, timeout)
 
 
 def telnet(host, port, username, password, prompt, linesep="\n", timeout=10):
@@ -661,7 +670,7 @@ def telnet(host, port, username, password, prompt, linesep="\n", timeout=10):
     @return: kvm_spawn object on success and None on failure.
     """
     command = "telnet -l %s %s %s" % (username, host, port)
-    return remote_login(command, password, prompt, linesep, timeout)
+    return remote_login(command, username, password, prompt, linesep, timeout)
 
 
 def netcat(host, port, username, password, prompt, linesep="\n", timeout=10):
@@ -678,7 +687,7 @@ def netcat(host, port, username, password, prompt, linesep="\n", timeout=10):
     @return: kvm_spawn object on success and None on failure.
     """
     command = "nc %s %s" % (host, port)
-    return remote_login(command, password, prompt, linesep, timeout)
+    return remote_login(command, username, password, prompt, linesep, timeout)
 
 
 # The following are utility functions related to ports.