[PATCH 1/9] KVM test: Introduce the prompt assist

[Jason Wang <jasowang@redhat.com>]

Sometimes we need to send an assist string to a session in order to
get the prompt especially when re-connecting to an already logged
serial session. This patch send the assist string before doing the
pattern matching of remote_login.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 client/tests/kvm/kvm_utils.py |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/client/tests/kvm/kvm_utils.py b/client/tests/kvm/kvm_utils.py
index 25f3c8c..9adbaee 100644
--- a/client/tests/kvm/kvm_utils.py
+++ b/client/tests/kvm/kvm_utils.py
@@ -451,7 +451,8 @@ 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, password, prompt, linesep="\n", timeout=10,
+                 prompt_assist = None):
     """
     Log into a remote host (guest) using SSH or Telnet. Run the given command
     using kvm_spawn and provide answers to the questions asked. If timeout
@@ -468,7 +469,8 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10):
     @param timeout: The maximal time duration (in seconds) to wait for each
             step of the login procedure (i.e. the "Are you sure" prompt, the
             password prompt, the shell prompt, etc)
-
+    @prarm 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,
@@ -479,6 +481,9 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10):
 
     logging.debug("Trying to login with command '%s'" % command)
 
+    if prompt_assist is not None:
+        sub.sendline(prompt_assist)
+
     while True:
         (match, text) = sub.read_until_last_line_matches(
                 [r"[Aa]re you sure", r"[Pp]assword:\s*$", r"^\s*[Ll]ogin:\s*$",