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Date: 十二月 10, 2015

Kubernetes笔记(2)—— 编译时的workspace

编译k8s代码时,会在k8s根目录下生成一个_output文件夹,同时这个文件夹下还包含local文件夹:

~/kubernetes/_output/local$ ls
bin  go

go文件夹下就是一个标准的Go语言workspace

:~/kubernetes/_output/local/go$ ls -alt
total 20
drwxrwxr-x 4 nan nan 4096 Dec  9 22:09 ..
drwxrwxr-x 2 nan nan 4096 Dec  9 22:09 bin
drwxrwxr-x 4 nan nan 4096 Dec  9 22:08 pkg
drwxrwxr-x 5 nan nan 4096 Dec  9 22:07 .
drwxrwxr-x 3 nan nan 4096 Dec  9 22:04 src

进入src文件夹:

~/kubernetes/_output/local/go/src$ ls -alt
total 12
drwxrwxr-x 5 nan nan 4096 Dec  9 22:07 ..
drwxrwxr-x 2 nan nan 4096 Dec  9 22:06 k8s.io
drwxrwxr-x 3 nan nan 4096 Dec  9 22:04 .
nan@ubuntu:~/kubernetes/_output/local/go/src$ cd k8s.io/
nan@ubuntu:~/kubernetes/_output/local/go/src/k8s.io$ ls -alt
total 8
drwxrwxr-x 2 nan nan 4096 Dec  9 22:06 .
lrwxrwxrwx 1 nan nan   20 Dec  9 22:06 kubernetes -> /home/nan/kubernetes
drwxrwxr-x 3 nan nan 4096 Dec  9 22:04 ..

可以看到,src/k8s.io/kubernetes就是一个指向外层工作目录的软链接。

至此,可以理解代码里下面import语句为什么能工作了:

import (
    "k8s.io/kubernetes/contrib/mesos/pkg/controllermanager"
    "k8s.io/kubernetes/contrib/mesos/pkg/hyperkube"
)

 

Go语言的workspace

一个典型的Golang workspace包含3个文件夹:

src contains Go source files organized into packages (one package per directory),  
pkg contains package objects, and  
bin contains executable commands.

src包含这个工程的所有源码文件(包含依赖的第三方package的源码),pkg包含编译生成的package目标文件,而bin包含最后生成的可执行文件。下面是一个例子:

bin/
    hello                          # command executable
    outyet                         # command executable
pkg/
    linux_amd64/
        github.com/golang/example/
            stringutil.a           # package object
src/
    github.com/golang/example/
        .git/                      # Git repository metadata
    hello/
        hello.go               # command source
    outyet/
        main.go                # command source
        main_test.go           # test source
    stringutil/
        reverse.go             # package source
        reverse_test.go        # test source  

参考资料:
Workspaces

 

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