2021-04-22

Why Windows Installer pop up? (Resolved)

What’s the problem?

Today I am having a problem where the Windows installer I created is not installing, and the following Windows installer box pops up.

Windows Installer

But it works well in the previous build, and I didn’t make any code changes. It is strange, actually fix this problem is very easy but not easy to find.

2021-04-06

Coverage

JaCoCo 代码覆盖率实践分享

本文适用的是 Gradle 来构建和适用 JaCoCo。

分别介绍了 build.gradle 的文件配置，执行测试和生成报告，报告参数说明，以及如何忽略指定的包或类从而影响测试覆盖率的结果。

build.gradle 文件配置

比如使用 gradle 来管理的项目可以在 build.gradle 里添加如下代码

plugins {
    id 'jacoco'
}

jacoco {
    toolVersion = "0.8.5"
}

test {
    useJUnitPlatform()
    exclude '**/**IgnoreTest.class'  // 如果有 test case 不通过，如有必要可以通过这样忽略掉
    finalizedBy jacocoTestReport       // report is always generated after tests run
}

jacocoTestReport {
    dependsOn test // tests are required to run before generating the report
    reports {
        xml.enabled true
        csv.enabled false
        html.destination file("${buildDir}/reports/jacoco")
    }
}

执行测试，生成代码覆盖率报告

然后执行 gradle test 就可以了。之后可以可以在 build\reports\jacoco 目录下找到报告了。

JaCoCo报告

重点是如何分析报告。打开 index.html，报告显示如下：

JaCoCo报告首页

报告参数说明

2021-03-28

Language

你的 Python 代码够不够 Pythonic？

Python 不必多说，它是众多编程语言中最容易学习的动态类型语言。它的跨平台、易读、易写、丰富的 Packages 等众多特性，也是众多DevOps/测试/开发工程师是最常用的语言之一。

相信不少人用它完成了很多工作，但你是不是仅仅止步于功能的实现而忽略了去写出更加简洁，优美的 Pythonic 代码呢？

在我最开始用 Python 时，我还不知道 Pythonic 这个词，直到多年前一位资深的程序员在给我培训的时候提到了项目中有一些代码不够 Pythonic，需要重构。根据语境，我理解他的意思：就是 Python 的代码没有按照 Python 的方式来写。

2021-03-24

Jenkins

Different branches have different default parameters in Jenkins

Problem

When you use Jenkins multibranch pipeline, you may want to have different default parameters settings for defferent branches build.

For example:

For develop/hotfix/release branches, except regular build, you also want to do some code analyzes, like code scanning, etc.
For other branches, like feature/bugfix or Pull Request that you just want to do a regular build.

So you need to have dynamic parameter settings for your multibranch pipeline job.

2021-03-20

DevOps

基于谷歌代码审查（Code Review）法则的思考与实践

背景

代码审查（Code Review），就是让别人来审查你的代码，其目的就是确保代码库的整体代码运行状况随着时间推移而不断改善。

2021-02-11

Jenkins

Jenkins upgrade issue "Windows agents won't start" workaround

Today, when I tried to upgrade my team’s Jenkins server from Jenkins 2.235.1 to Jenkins 2.263.3, I met a problem that can not launch the Windows agent.

[2021-01-29 23:50:40] [windows-agents] Connecting to xxx.xxx.xxx.xxx
<!-- more -->
Checking if Java exists
java -version returned 11.0.2.
[2021-01-29 23:50:40] [windows-agents] Installing the Jenkins agent service
[2021-01-29 23:50:40] [windows-agents] Copying jenkins-agent.exe
ERROR: Unexpected error in launching an agent. This is probably a bug in Jenkins
Also: java.lang.Throwable: launched here
at hudson.slaves.SlaveComputer._connect(SlaveComputer.java:286)
at hudson.model.Computer.connect(Computer.java:435)
at hudson.slaves.SlaveComputer.doLaunchSlaveAgent(SlaveComputer.java:790)
...
...
at java.lang.Thread.run(Thread.java:748)
java.lang.NullPointerException
at hudson.os.windows.ManagedWindowsServiceLauncher.launch(ManagedWindowsServiceLauncher.java:298)

This issue had been raised in the Jenkins Jira project: JENKINS-63198 and JENKINS-63198

There is also a Windows Support Updates guide here that mentioned this problem.

Finally, I fixed this problem by the following steps:

Update windows-slaves-plugin to the lastest version 1.7 (fixes for Jenkins 2.248+)

Then the error should be like this

[2021-01-30 23:53:40] [windows-agents] Connecting to xxx.xxx.xxx.xxx
Checking if Java exists
java -version returned 11.0.2.
[2021-01-30 23:53:47] [windows-agents] Copying jenkins-agent.xml
[2021-01-30 23:53:48] [windows-agents] Copying agent.jar
[2021-01-30 23:53:48] [windows-agents] Starting the service
ERROR: Unexpected error in launching an agent. This is probably a bug in Jenkins
org.jinterop.dcom.common.JIException: Unknown Failure
	at org.jvnet.hudson.wmi.Win32Service$Implementation.start(Win32Service.java:149)
Caused: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor219.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.kohsuke.jinterop.JInteropInvocationHandler.invoke(JInteropInvocationHandler.java:140)
Also:   java.lang.Throwable: launched here

Then change jenkins-agent.exe.config file. remove or comment out this line <supportedRuntime version="v2.0.50727" /> as below

also do this for jenkins-slave.exe.config in case it also exists.

<configuration>
  <runtime>
    <!-- see http://support.microsoft.com/kb/936707 -->
    <generatePublisherEvidence enabled="false"/>
  </runtime>
  <startup>
    <!-- this can be hosted either on .NET 2.0 or 4.0 -->
    <!-- <supportedRuntime version="v2.0.50727" /> -->
    <supportedRuntime version="v4.0" />
  </startup>
</configuration>

Then try to Launch agent.

If it still does not work and has this error message “.NET Framework 2.0 or later is required on this computer to run a Jenkins agent as a Windows service”, you need to upgrade your .NET Framework.