Tekton 克隆 git 仓库

Tekton 克隆 git仓库

介绍如何使用 Tektonhub 官方 git-clone task 克隆 github 上的源码到本地。

git-clone task yaml文件下载地址：https://hub.tekton.dev/tekton/task/git-clone

查看git-clone task yaml内容：

点击Install，选择一种方式创建 task

这里使用kubectl命令创建官方git-clone task

kubectl apply -f \
https://raw.githubusercontent.com/tektoncd/catalog/main/task/git-clone/0.9/git-clone.yaml

查看创建的task

$ kubectl get task
NAME             AGE
git-clone        4h32m

git-clone task创建后，可以通过taskRun或pipelineRun进行调用。

非认证方式克隆

公开仓库无需配置认证即可直接克隆，这里以克隆 tekton pipeline 官方仓库为例。

创建一个简单的 taskRun 调用 git-clone task 来执行克隆任务，并向git-clone task传递一些自定义参数：

$ cat git-clone-taskrun.yaml
apiVersion: tekton.dev/v1beta1
kind: TaskRun
metadata:
  generateName: git-clone-taskrun-
spec:
  taskRef:
    name: git-clone
  podTemplate:
    hostNetwork: true
  workspaces:
    - name: output
      emptyDir: {}
  params:
  - name: url
    value: https://github.com/tektoncd/pipeline.git
  - name: revision
    value: main
  - name: subdirectory
    value: pipeline
  - name: httpProxy
    value: http://192.168.72.1:7890/
  - name: httpsProxy
    value: http://192.168.72.1:7890/
  - name: deleteExisting
    value: "true"
  - name: gitInitImage
    #value: gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/git-init:latest
    value: dyrnq/tektoncd-pipeline-cmd-git-init:latest

所有的参数都是在git-clone task中已经预定义的，这里只需传参即可，参数说明：

• workspaces：必选，为克隆的代码指定一个卷，这里作为演示，使用emptyDir类型的卷
• url：指定克隆的git仓库地址
• revision：指定克隆的git仓库分支
• httpProxy：克隆github很有可能由于众所周知的原因失败，这里使用本地代理，可选
• subdirectory：配置代码克隆到指定子目录下
• gitInitImage：指定执行克隆任务的docker镜像，由于官方镜像无法访问，可以在dockerhub搜索可用镜像

应用yaml文件

kubectl create -f git-clone-taskrun.yaml

登录tekton dashboard 确认 taskRun 任务成功，说明已经成功克隆远程仓库到本地：

basic-auth 认证方式克隆

前置要求：

• 已准备远程私有 GitHub 仓库
• 用于访问远程存储库的 GitHub 个人访问令牌 (PAT)。

以basic-auth认证方式为例，注意该pipeline依然调用官方git-clone task执行克隆任务。

1. 创建secret和serviceaccount账号

设置创建 github-pat-secret 时使用的所需环境变量

export GITHUB_USERNAME='<your github.com username>'
export TEKTON_GITHUB_PAT='<your github.com username personal accesstoken>'

创建可以保存您的 GitHub.com 凭据的 Kubernetes secret：

cat >git-clone-sa.yaml<<EOF
apiVersion: v1
kind: Secret
metadata:
  name: basic-user-pass
  annotations:
    tekton.dev/git-0: https://github.com
type: kubernetes.io/basic-auth
stringData:
  username: $GITHUB_USERNAME
  password: $TEKTON_GITHUB_PAT
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: github-bot
secrets:
  - name: basic-user-pass
EOF

应用yaml文件

kubectl apply -f git-clone-sa.yaml

2. 创建Pipeline和PipelineRun

官方参考：
https://github.com/tektoncd/catalog/blob/main/task/git-clone/0.9/samples/git-clone-checking-out-a-branch.yaml

创建 git 克隆Pipeline和PipelineRun，该管道将从私有 GitHub 存储库克隆并查看代码中README文件内容：

$ cat git-clone-pipelinerun.yaml
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: cat-branch-readme
spec:
  params:
  - name: repo-url
    type: string
    description: The git repository URL to clone from.
  - name: branch-name
    type: string
    description: The git branch to clone.
  - name: httpProxy
    type: string
    description: The httpProxy params.
  - name: httpsProxy
    type: string
    description: The httpsProxy params.
  - name: gitInitImage
    type: string
    description: The gitInitImage params.
  workspaces:
  - name: shared-data
  tasks:
  - name: fetch-repo
    taskRef:
      name: git-clone
    workspaces:
    - name: output
      workspace: shared-data
    params:
    - name: url
      value: $(params.repo-url)
    - name: revision
      value: $(params.branch-name)
    - name: httpProxy
      value: $(params.httpProxy)
    - name: httpsProxy
      value: $(params.httpsProxy)
    - name: gitInitImage
      value: $(params.gitInitImage)
  - name: cat-readme
    runAfter: ["fetch-repo"]
    workspaces:
    - name: source
      workspace: shared-data
    taskSpec:
      workspaces:
      - name: source
      steps:
      - image: zshusers/zsh:4.3.15
        script: |
          #!/usr/bin/env zsh
          cat $(workspaces.source.path)/README.md
---
apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: git-clone-checking-out-a-branch-
spec:
  serviceAccountName: github-bot
  pipelineRef:
    name: cat-branch-readme
  podTemplate:
    securityContext:
      fsGroup: 65532
  workspaces:
  - name: shared-data
    volumeClaimTemplate:
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
  params:
  - name: repo-url
    value: https://github.com/willzhang/test.git
  - name: branch-name
    value: main
  - name: httpProxy
    value: http://192.168.72.1:7890/
  - name: httpsProxy
    value: http://192.168.72.1:7890/
  - name: gitInitImage
    value: registry.cn-shenzhen.aliyuncs.com/cnmirror/git-init:latest

参数说明：

• workspaces：必选，PipelineRun中定义了volumeClaimTemplate类型的workspaces，能够动态申请所需的持久卷，使用kubectl get storageclass命令，确认k8s集群有默认可用的storageclass资源可用，本示例输出为openebs-hostpath (default)
• serviceAccountName：必选，注意PipelineRun中定义了serviceAccountName: github-bot参数，用于执行任务
• url：指定克隆的私有github仓库地址
• revision：指定克隆的git仓库分支
• gitInitImage：指定执行克隆任务的docker镜像，由于官方镜像无法访问，可以在dockerhub搜索可用镜像

应用yaml文件

kubectl create -f git-clone-pipelinerun.yaml

登录dashbord确认克隆任务是否成功

ssh-auth认证方式

1. 创建secret和serviceaccount账号

任意一台linux机器，生成 SSH 密钥对

ssh-keygen -t rsa -b 4096 -f id_rsa -q -N ""

将公钥id_rsa.pub上传至github

root@kube001:~# cat /root/.ssh/id_rsa.pub
ssh-rsa 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 root@kube001

配置示例：https://github.com/settings/keys

获取私钥内容，复制到Secret中ssh-privatekey字段。

root@kube001:~# cat /root/.ssh/id_rsa
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAACFwAAAAdzc2gtcn
NhAAAAAwEAAQAAAgEAl8oJXWd7bdKLzS5OOKUJSZBc4JU+9bAIdjnI36W25aC7UOyZT8Gp
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SzPzjmCldksAAAAMcm9vdEBrdWJlMDAxAQIDBAUGBw==
-----END OPENSSH PRIVATE KEY-----

创建secret和serviceaccount

$ cat git-clone-sa.yaml
apiVersion: v1
kind: Secret
metadata:
  name: ssh-key
  annotations:
    tekton.dev/git-0: github.com
type: kubernetes.io/ssh-auth
stringData:
  ssh-privatekey: |
    -----BEGIN OPENSSH PRIVATE KEY-----
    b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAACFwAAAAdzc2gtcn
    NhAAAAAwEAAQAAAgEAl8oJXWd7bdKLzS5OOKUJSZBc4JU+9bAIdjnI36W25aC7UOyZT8Gp
    M1tIwarCv3TiLqi5jJte+nYkGrl99iaxi/AXDhI9DKeThliMAfpZqTFandlDFWj4bH7tKu
    IZl2FHRYqptjAevLFCdfz+RbBWG+jdWSfxouKF8C/RegUxMxNHgxOj1R8EEaftjTO8wZB1
    cdVyQjs31+Pl87vd8TInf2aeS3wrxzSSr40OwuxUeFIKwLQgoMdjmHnXzznThxcE0DdPPT
    w855On1Laned046DKUDMMnpDSYgZuZ2WQFgV0zf96+UiwD1WxNJYfEsxxBl2zRs5kHjdsG
    li1AMOlWl4YAzwKRWdiHeN1IN/r/XRGO/ZryuA2ZvNSs7Km+2331iwebj69z+a/W5IfK3G
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    VEae24TmlNLtWo2GGG0ZE8+zXx+cKRdYj1baS4rDFP+iW9AnxaoAdWp8mW/xJMXSz7wjZk
    5VRA5ivtZDLpgyicBwf1PYqHOIGrNedCmmtHDzhV0ERyt7D/Prql3IWVgvz09RdhD3pXcO
    DkE4TLs5RMSA2Erh6OddRIwsSM07tXLwalQpuyuoGNMyK/ZidugfQesIEZPwb7cPi35eSQ
    5lT2EpjfPsxBSWisUA3U1AIVBhejpK58ZHw6TH/AZEXNFGdENKNwAMV+FR3Rn3V7NTH/y7
    SzPzjmCldksAAAAMcm9vdEBrdWJlMDAxAQIDBAUGBw==
    -----END OPENSSH PRIVATE KEY-----
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: github-bot
secrets:
  - name: ssh-key

应用yaml文件

kubectl apply -f git-clone-sa.yaml

2.创建Pipeline和PipelineRun

创建 git 克隆PipelineRun，该管道将从私有 GitHub 存储库克隆并简单列出内容：

$ cat git-clone-pipelinerun.yaml
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: cat-branch-readme
spec:
  params:
  - name: repo-url
    type: string
    description: The git repository URL to clone from.
  - name: branch-name
    type: string
    description: The git branch to clone.
  - name: gitInitImage
    type: string
    description: The gitInitImage params.
  workspaces:
  - name: shared-data
  tasks:
  - name: fetch-repo
    taskRef:
      name: git-clone
    workspaces:
    - name: output
      workspace: shared-data
    params:
    - name: url
      value: $(params.repo-url)
    - name: revision
      value: $(params.branch-name)
    - name: gitInitImage
      value: $(params.gitInitImage)
  - name: cat-readme
    runAfter: ["fetch-repo"]
    workspaces:
    - name: source
      workspace: shared-data
    taskSpec:
      workspaces:
      - name: source
      steps:
      - image: zshusers/zsh:4.3.15
        script: |
          #!/usr/bin/env zsh
          cat $(workspaces.source.path)/README.md
---
apiVersion: tekton.dev/v1beta1
kind: PipelineRun
metadata:
  generateName: git-clone-checking-out-a-branch-
spec:
  serviceAccountName: github-bot
  pipelineRef:
    name: cat-branch-readme
  podTemplate:
    securityContext:
      fsGroup: 65532
  workspaces:
  - name: shared-data
    volumeClaimTemplate:
      spec:
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
  params:
  - name: repo-url
    value: git@github.com:willzhang/test.git
  - name: branch-name
    value: main
  - name: gitInitImage
    value: registry.cn-shenzhen.aliyuncs.com/cnmirror/git-init:latest

参数说明：

• 注意修改克隆URL地址格式为：git@github.com:willzhang/test.git
• 去除httproxy部分，以免影响ssh认证

应用yaml文件

kubectl create -f git-clone-pipelinerun.yaml

登录dashbord 查看参数信息，确认克隆任务是否成功

显示 git 仓库 README 信息

参考：https://redhat-scholars.github.io/tekton-tutorial/tekton-tutorial/private_reg_repos.html