How to writing the buildspec yaml code in cdk - amazon-web-services

Question

I making the codebuild with cdk
It can accept the buildspec as yaml, however ,how can I do the same thing in cdk?
What I want to do is like this, of course it doesn't work though,
I forcely put the yaml code in commands.
const buildProject = new codebuild.PipelineProject(this, 'project', {
environment: {// I guess I need to select ubuntu and image 4.0},
buildSpec: codebuild.BuildSpec.fromObject({
version: '0.2',
phases: {
build: {
commands:['
version: 0.2
phases:
install:
runtime-versions:
docker: 18
build:
commands:
- apt-get install jq -y
- ContainerName="tnkDjangoContainer"
- ImageURI=$(cat imageDetail.json | jq -r '.ImageURI')
- printf '[{"name":"CONTAINER_NAME","imageUri":"IMAGE_URI"}]' > imagedefinitions.json
- sed -i -e "s|CONTAINER_NAME|$ContainerName|g" imagedefinitions.json
- sed -i -e "s|IMAGE_URI|$ImageURI|g" imagedefinitions.json
- cat imagedefinitions.json
artifacts:
files:
- imagedefinitions.json
',
],
},
}
})
});
And also I guess I need to choose the image to do the buildspec such as Ubuntu
Where can I set these?

Answer 1

CDK does not expose a method to inline a YAML buildspec at synth-time. You could do this yourself by parsing existing YAML into a JS object and passing the result to BuildSpec.fromObject.
CDK's codebuild.Project gives you several other ways to provide a buildSpec:
BuildSpec.fromObject inlines a buildspec from key-value pairs at synth-time. It should follow the CodeBuild buildspec format. CDK will output a stringified JSON buildspec in the CloudFormation template. If you want CDK to output YAML instead, use fromObjectToYaml. Both methods take key-value pairs (type: [key: string]: any;) as input, so TS can't offer much typechecking help.
BuildSpec.fromSourceFilename tells CodeBuild to use a buildspec file in your source at run-time. The filename is passed in the CloudFormation template.
Here's an example of parsing a YAML string into inlined YAML output, using the yaml package. Note that the environment is defined outside the buildspec:
import * as yaml from 'yaml';
const fromYaml = yaml.parse(`
version: '0.2'
phases:
build:
commands:
- npm run build
`);
new codebuild.Project(this, 'YamlInYamlOutProject', {
environment: {
buildImage: codebuild.LinuxBuildImage.STANDARD_5_0, // Ubuntu Standard 5
},
buildSpec: codebuild.BuildSpec.fromObjectToYaml(fromYaml),
});