Ruby 脚本在命令行上运行良好，但在 Jenkins 中失败答案

【问题标题】：Ruby script works fine on command line, but fails in JenkinsRuby 脚本在命令行上运行良好，但在 Jenkins 中失败
【发布时间】：2017-07-23 17:37:56
【问题描述】：

BLUF：Ruby 脚本在命令行上运行良好，但在 Jenkins 中失败。

环境信息：

Ubuntu 16.04
Watir 6.1.0
Jenkins 2.4
Rubygems 2.6.10

*** LOCAL GEMS **
bigdecimal (default: 1.2.8)
childprocess (0.6.2)
colorize (0.8.1)
dbi (0.4.5)
did_you_mean (1.0.0)
ffi (1.9.17)
headless (2.3.1)
io-console (default: 0.4.5)
json (default: 1.8.3)
mail (2.6.4)
mime-types (3.1)
mime-types-data (3.2016.0521)
mini_portile2 (2.1.0)
minitest (5.10.1, 5.8.4)
mysql2 (0.4.5)
net-ssh (4.1.0)
net-ssh-gateway (2.0.0)
net-telnet (0.1.1)
nokogiri (1.7.0.1)
power_assert (1.0.1, 0.2.7)
psych (default: 2.0.17)
rake (12.0.0, 10.5.0)
rdoc (5.1.0, default: 4.2.1)
rubygems-update (2.6.10, 2.6.8)
rubyzip (1.2.1)
selenium-webdriver (3.2.2)
test-unit (3.2.3, 3.1.7)
watir (6.2.0, 6.1.0)
websocket (1.2.4)

我有一个使用 watir 运行的 ruby 脚本。当我在命令行上运行它时它工作正常，但当我通过 Jenkins 中的作业/构建运行它时失败。它总是失败，因为设置浏览器不起作用。这是以下错误：

Started by user anonymous
Building in workspace /ebs/jenkins/jobs/test watir/workspace
[workspace] $ /bin/sh -xe /tmp/hudson6395492977367774608.sh
+ ruby /opt/mysite/ci/regression.rb someSiteName dev false true
Running headless.
Running browser.
/opt/mysite/ci/regression.rb:166:in `<main>': undefined method `close' for nil:NilClass (NoMethodError)
Did you mean?  clone
Net::ReadTimeout. /usr/lib/ruby/2.3.0/net/protocol.rb:158:in `rbuf_fill'
<br />/usr/lib/ruby/2.3.0/net/protocol.rb:136:in `readuntil'
<br />/usr/lib/ruby/2.3.0/net/protocol.rb:146:in `readline'
<br />/usr/lib/ruby/2.3.0/net/http/response.rb:40:in `read_status_line'
<br />/usr/lib/ruby/2.3.0/net/http/response.rb:29:in `read_new'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1437:in `block in transport_request'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1434:in `catch'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1434:in `transport_request'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1407:in `request'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1400:in `block in request'
<br />/usr/lib/ruby/2.3.0/net/http.rb:853:in `start'
<br />/usr/lib/ruby/2.3.0/net/http.rb:1398:in `request'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/http/default.rb:124:in `response_for'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/http/default.rb:78:in `request'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/http/common.rb:61:in `call'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/bridge.rb:671:in `raw_execute'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/bridge.rb:110:in `create_session'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/remote/bridge.rb:71:in `initialize'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/chrome/bridge.rb:42:in `initialize'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/common/driver.rb:61:in `new'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver/common/driver.rb:61:in `for'
<br />/var/lib/gems/2.3.0/gems/selenium-webdriver-3.2.2/lib/selenium/webdriver.rb:87:in `for'
<br />/var/lib/gems/2.3.0/gems/watir-6.2.0/lib/watir/browser.rb:46:in `initialize'
<br />/opt/mysite/ci/regression.rb:50:in `new'
<br />/opt/mysite/ci/regression.rb:50:in `<main>'
Build step 'Execute shell' marked build as failure
Finished: FAILURE

我仔细检查了我正在使用的模块的版本，这些版本是从“apt”安装的。我还仔细检查了每个安装 gem 的版本。我将沿命令行传递给脚本的变量硬编码（而不是使用参数化构建）。以下是正在执行的脚本中的代码：

#!/usr/bin/env ruby
require 'watir'
require 'headless'
argSite        = ARGV[0]
argEnvironment = ARGV[1]
argSendEmail   = ARGV[2]
argHeadless    = ARGV[3]
begin
    if argHeadless.to_s == 'true'
        puts "Running headless."
        headless = Headless.new
        headless.start
    end

    puts "Running browser."
# vvv reason tests fail
    browser = Watir::Browser.new(:chrome)
    browser.window.resize_to(1200, 1000)
    browser.driver.manage.timeouts.implicit_wait = 15

...tests go here...

rescue => e
    puts ("#{e}. "+ e.backtrace.join("\n<br />"))
ensure
# vvv script fails here
    browser.close
    if argHeadless.to_s == 'true'
        headless.destroy
    end
end

【问题讨论】：

好像browser 没有初始化。您是否安装了watir-webdriver 在运行 Jenkins 的机器上启动 Chrome？
@Uzbekjon 我添加了要求。 fwiw/fyi，watir 6 只需要调用“require 'watir'”，不再需要“*-webdriver”。默认情况下也会选择 chrome。注意：chromedriver 已安装。

标签： ruby jenkins hudson watir

【解决方案1】：

回答：Chrome 无法以 root 身份运行。 Jenkins 以 root 身份运行。当它运行构建时，构建以 root 身份运行。在使用以下命令来更改脚本运行的用户。

su -c 'ruby /opt/mysite/ci/regression.rb someSiteName dev false true' jenkins

【讨论】：