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"
)