Replace Env in File

Replace Env in File is an Azure DevOps custom task that replaces placeholders in a file with values from pipeline variables or environment variables.
It’s perfect for injecting build-time or deployment-time configuration into your YAML, JSON, or any text-based files.

🛠 How It Works

You can define variables in your Azure Pipeline and reference them inside your files with a chosen delimiter (default is __).

📂 Example Input File (deployment.yaml)

apiVersion: v1
kind: Deployment
metadata:
  name: my-app
spec:
  containers:
    - image: myrepo/__IMAGE_TAG__
      env:
        - name: API_KEY
          value: "__API_KEY__"

📦 Pipeline Variables

IMAGE_TAG = 1.0.0
API_KEY = 123456789

📜 After running the task, your file becomes:

apiVersion: v1
kind: Deployment
metadata:
  name: my-app
spec:
  containers:
    - image: myrepo/1.0.0
      env:
        - name: API_KEY
          value: "123456789"

📋 Example Pipeline

variables:
  IMAGE_TAG: 1.0.0
  API_KEY: 123456789

steps:
  - task: replace-env@1
    inputs:
      filePath: $(Build.SourcesDirectory)/deployment.yaml
      placeholderDelimiter: __