Re: [KVM-AUTOTEST PATCH] kvm_utils.py: remote_login(): improve regular expression matching

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The patch looks sane to me. A very good thing that can be done for
remote_login() is to tune the tmeouts. I have seen especialy with
windows guests or sometimes when the machine is heavily loaded the
timeouts elapse and the test fails. When I increased the timeouts the
test did not fail. internal_timeout=0.5 is too less in my views and
even timeouts of 10 seconds prove insufficient sometimes. Do you too
have any such experience?

On Sun, May 24, 2009 at 9:16 PM, Michael Goldish <mgoldish@xxxxxxxxxx> wrote:
> 1. Make the 'login:' regular expression stricter so it doesn't match
> 'Last login: ...' messages.
> 2. Make the 'password:' regular expression stricter.
> 3. Handle 'Connection refused' messages.
>
> Signed-off-by: Michael Goldish <mgoldish@xxxxxxxxxx>
> ---
>  client/tests/kvm_runtest_2/kvm_utils.py |   13 +++++++++----
>  1 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/client/tests/kvm_runtest_2/kvm_utils.py b/client/tests/kvm_runtest_2/kvm_utils.py
> index be8ad95..5736cf6 100644
> --- a/client/tests/kvm_runtest_2/kvm_utils.py
> +++ b/client/tests/kvm_runtest_2/kvm_utils.py
> @@ -413,7 +413,8 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10):
>
>     while True:
>         (match, text) = sub.read_until_last_line_matches(
> -                ["[Aa]re you sure", "[Pp]assword:", "[Ll]ogin:", "[Cc]onnection.*closed", prompt],
> +                [r"[Aa]re you sure", r"[Pp]assword:\s*$", r"^\s*[Ll]ogin:\s*$",
> +                    r"[Cc]onnection.*closed", r"[Cc]onnection.*refused", prompt],
>                 timeout=timeout, internal_timeout=0.5)
>         if match == 0:  # "Are you sure you want to continue connecting"
>             kvm_log.debug("Got 'Are you sure...'; sending 'yes'")
> @@ -437,11 +438,15 @@ def remote_login(command, password, prompt, linesep="\n", timeout=10):
>             kvm_log.debug("Got 'Connection closed'")
>             sub.close()
>             return None
> -        elif match == 4:  # prompt
> +        elif match == 4:  # "Connection refused"
> +            kvm_log.debug("Got 'Connection refused'")
> +            sub.close()
> +            return None
> +        elif match == 5:  # prompt
>             kvm_log.debug("Got shell prompt -- logged in")
>             return sub
>         else:  # match == None
> -            kvm_log.debug("Timeout or process terminated")
> +            kvm_log.debug("Timeout elapsed or process terminated")
>             sub.close()
>             return None
>
> @@ -470,7 +475,7 @@ def remote_scp(command, password, timeout=300, login_timeout=10):
>
>     while True:
>         (match, text) = sub.read_until_last_line_matches(
> -                ["[Aa]re you sure", "[Pp]assword:", "lost connection"],
> +                [r"[Aa]re you sure", r"[Pp]assword:\s*$", r"lost connection"],
>                 timeout=_timeout, internal_timeout=0.5)
>         if match == 0:  # "Are you sure you want to continue connecting"
>             kvm_log.debug("Got 'Are you sure...'; sending 'yes'")
> --
> 1.5.4.1
>
> --
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-- 
Sudhir Kumar
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