如何在代码构建中将命令的输出分配给变量

时间:2018-03-17 10:25:06

标签: amazon-web-services aws-codebuild

每当推送到我的源代码并将docker镜像移动到ECR(EC2 Container Registry)时,我都会尝试构建一个docker镜像。

我尝试使用以下构建规范文件

    version: 0.2
env:
  variables:
    IMG: "app"
    REPO: "<<zzzzzzzz>>.dkr.ecr.us-east-1.amazonaws.com/app"      
phases:
  pre_build:
    commands:
      - echo Logging in to Amazon ECR...
      - aws ecr get-login --region us-east-1
      - TAG=echo $CODEBUILD_RESOLVED_SOURCE_VERSION | head -c 8
  build:
    commands:
      - echo $TAG
      - docker build -t $IMG:$TAG .
      - docker tag $IMG:$TAG $REPO:$TAG 
  post_build:
    commands:
      - docker push $REPO:$TAG
      - printf Image":"%s:%s" $REPO $TAG > build.json
artifacts:
  files: build.json
  discard-paths: yes

当我构建这个时,我在docker build -t

收到错误invalid reference format

我查看了文档但没有找到任何帮助。

2 个答案:

答案 0 :(得分:1)

TAG=$(echo $CODEBUILD_RESOLVED_SOURCE_VERSION | head -c 8)

你可以使用$()

version: 0.2

phases:
  install:
    commands:
      - echo Entered the install phase...
      - TAG=$(echo "This is test")
  pre_build:
    commands:
      - echo $TAG
  build:
    commands:
      - echo Entered the build phase...
      - echo Build started on $TAG

日志:

[Container] 2018/03/17 16:15:31 Running command TAG=$(echo "This is test")
[Container] 2018/03/17 16:15:31 Entering phase PRE_BUILD
[Container] 2018/03/17 16:15:31 Running command echo $TAG
This is test

答案 1 :(得分:1)

经过多次重试后,我终于找到了我的错误。

Env CODEBUILD_RESOLVED_SOURCE_VERSION 应替换为 CODEBUILD_SOURCE_VERSION 环境变量,因为我正在使用codebuild直接从GitHub中的源代码库构建。

要登录ecr,需要添加--no-include-email选项并使用$()包装命令。这将允许您运行docker登录。我更新的buildspec文件类似于

version: 0.2
env:
  variables:
    REPO: "184665364105.dkr.ecr.us-east-1.amazonaws.com/app" 
phases:
  pre_build:
    commands:
      - echo $CODEBUILD_SOURCE_VERSION
      - TAG=$(echo $CODEBUILD_SOURCE_VERSION | head -c 8)
      - echo Logging in to Amazon ECR...
      - $(aws ecr get-login --no-include-email --region us-east-1)
  build:
    commands:
      - echo $TAG
      - echo $REPO
      - docker build --tag $REPO:$TAG .
  post_build:
    commands:
      - docker push $REPO:$TAG