python-2.7 - 使用机器人框架在远程计算机上进行 SSH 连接 : Channel Exception;(4, 资源短缺”)

Question

我正在尝试使用机器人框架与远程机器建立 SSH 连接并执行一些命令。但是我收到一条错误消息 ChannelException:(4,'Resource shortage') 并且我不知道它是什么意思。

Script: test.robot
*** Settings ***
Library    SSHLibrary
Suite Setup    open_connection_and_login
Suite Teardown    Close All Connections

*** Variables ***
${HOST}    login
${USERNAME}    root
${PASSWORD}    password

*** Test Cases ***
available_disk_on_remote
    ${output}=    Execute Command  df -h
    Log To Console    "${output}"

*** Keywords ***
open_connection_and_login
    Open Connection    ${HOST}
    Login  ${USERNAME}    ${PASSWORD}   4

Output:
[root@machine1 Robot]# robot test.robot
===========================================================================
Test
======================================================================
available_disk_on_remote                                             | FAIL |
ChannelException: (4, 'Resource shortage')
--------------------------------------------------------------------------
Test                                                                 | FAIL |
1 critical test, 0 passed, 1 failed
1 test total, 0 passed, 1 failed
=========================================================================
Output:  /root/Robot/output.xml
Log:     /root/Robot/log.html
Report:  /root/Robot/report.html

Python 2.7.5 和机器人框架 3.0.2(仅供引用，机器人框架的新手)

Answer 1

您必须使用 OperatingSystem 库中的 Run and Return RC 和 Output 来实现此目的。请在下面找到工作代码。

*** Settings ***
Library                OperatingSystem

*** Test Cases ***
 Check disk usage
    ${rc}      ${output} =     Run And Return Rc And Output     df -h
    Should Be Equal As Integers        ${rc}           0
    Log to console      ${output}

这将为您提供以下输出

[root@scripts]# pybot  diskusage.robot
==============================================================================
Diskusage                                                                     
==============================================================================
Check disk usage                                                      ..Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_tv274-lv_root
                       47G   20G   25G  44% /
tmpfs                 4.9G   84K  4.9G   1% /dev/shm
/dev/sda1             485M   38M  423M   9% /boot
/dev/mapper/vg_tv274-lv_home
                      4.6G  138M  4.2G   4% /home
/dev/sr0              658M  658M     0 100% /media/Ubuntu-Server 12.04.1 LTS amd64
Check disk usage                                                      | PASS |
------------------------------------------------------------------------------
Diskusage                                                             | PASS |
1 critical test, 1 passed, 0 failed
1 test total, 1 passed, 0 failed
==============================================================================