如何在代码构建中将命令的输出分配给变量 [英] How to assign output of a command to a variable in code build

问题描述

每当我推送源代码时，我都试图构建一个docker映像，并将该docker映像移至ECR(EC2容器注册表).

I am trying to build a docker image whenever there is push to my source code and move the docker image to the ECR( EC2 Container Registry).

我已经尝试使用以下构建规范文件

I have tried with the following build-spec file

    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

构建此文件时，我在docker build -t

when I build this I am receiving the error invalid reference format at docker build -t

我查看了文档，但没有任何帮助.

I looked into the document and found no help.

推荐答案

因此，经过多次重试，我终于发现了自己的错误.

So after of lots of retries, i finally found my mistake.

Env CODEBUILD_RESOLVED_SOURCE_VERSION 应该替换为 CODEBUILD_SOURCE_VERSION 环境变量，因为我正在使用codebuild直接从GitHub的源仓库中构建.

Env CODEBUILD_RESOLVED_SOURCE_VERSION should be replaced with CODEBUILD_SOURCE_VERSION environment variable because I am using codebuild to build directly from source repo in GitHub.

要登录ecr，需要添加-no-include-email 选项，并用$()包裹命令.这将允许您运行docker login.我更新后的buildspec文件与下面类似

To log in to ecr, need to add --no-include-email option and wrap the command with $(). This will allow you to run docker login. My updated buildspec file would be similar below

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

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