env-output-setter

README

GitHub Environment/Output Setter

Overview

The GitHub Environment/Output Setter is a GitHub Action that allows you to set multiple key-value pairs in both $GITHUB_ENV and $GITHUB_OUTPUT. This action is useful for workflows that need to dynamically define environment variables or output values that other steps can reference.

Inputs

Input	Required	Description	Default	Example
env_key	Yes	Comma-separated list of environment variable keys	-	"GCP_REGION,AWS_REGION"
env_value	Yes	Comma-separated list of environment variable values	-	"asia-northeast1,us-east-1"
output_key	Yes	Comma-separated list of output keys	-	"GCP_OUTPUT,AWS_OUTPUT"
output_value	Yes	Comma-separated list of output values	-	"gcp_success,aws_success"
delimiter	No	Delimiter for separating keys and values	,	","
fail_on_empty	No	Fail if any key or value is empty	true	"true"
trim_whitespace	No	Trim whitespace from keys and values	true	"true"
case_sensitive	No	Treat keys as case sensitive	true	"true"
error_on_duplicate	No	Error if duplicate keys are found	true	"true"
mask_secrets	No	Mask sensitive values in logs	false	"true"
mask_pattern	No	Custom pattern for masking (regex)	""	"(password|secret).*"
to_upper	No	Convert values to uppercase	false	"true"
to_lower	No	Convert values to lowercase	false	"true"
encode_url	No	URL encode values	false	"true"

Outputs

Output	Description	Example
set_env_count	Number of environment variables set	3
set_output_count	Number of outputs set	3
status	Status of the operation	"success"
error_message	Error message if any	""

Example Workflow

Below is an example of how to use the GitHub Environment/Output Setter action in a GitHub Actions workflow with all available options:

name: Example Workflow
on: [push]

jobs:
  set-env-output:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout infrastructure repository
        uses: actions/checkout@v4

      - name: Set Environment and Output Variables
        id: set_variables
        uses: somaz94/env-output-setter@v1
        with:
          # Required inputs
          env_key: 'GCP_REGION,AWS_REGION'
          env_value: 'asia-northeast1,us-east-1'
          output_key: 'GCP_OUTPUT,AWS_OUTPUT'
          output_value: 'gcp_success,aws_success'
          
          # Optional inputs with defaults
          delimiter: ',' 
          fail_on_empty: 'true'
          trim_whitespace: 'true'
          case_sensitive: 'true'
          error_on_duplicate: 'true'

      - name: Display Variables and Status
        run: |
          # Environment Variables
          echo "GCP_REGION: ${{ env.GCP_REGION }}"
          echo "AWS_REGION: ${{ env.AWS_REGION }}"
          
          # Outputs
          echo "GCP_OUTPUT: ${{ steps.set_variables.outputs.GCP_OUTPUT }}"
          echo "AWS_OUTPUT: ${{ steps.set_variables.outputs.AWS_OUTPUT }}"
          
          # Action Results
          echo "Variables Set: ${{ steps.set_variables.outputs.set_env_count }}"
          echo "Outputs Set: ${{ steps.set_variables.outputs.set_output_count }}"
          echo "Status: ${{ steps.set_variables.outputs.status }}"
          echo "Error (if any): ${{ steps.set_variables.outputs.error_message }}"

      # Error handling
      - name: Check for Errors
        if: steps.set_variables.outputs.status == 'failure'
        run: |
          echo "Error occurred: ${{ steps.set_variables.outputs.error_message }}"
          exit 1

Features

• Set multiple environment variables and outputs in one step
• Configurable delimiter for key-value pairs
• Whitespace trimming option
• Case sensitivity control for keys
• Duplicate key detection
• Empty value validation
• Detailed operation status and error reporting
• Retry mechanism for file operations

Advanced Usage

Error Handling Examples

# Handle empty values
- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'KEY1,KEY2'
    env_value: ',value2'  # KEY1 is empty
    fail_on_empty: 'true' # This will fail the action

# Case sensitivity example
- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'key1,Key1'
    env_value: 'value1,value2'
    case_sensitive: 'false' # This will treat key1 and Key1 as the same key

# Custom delimiter
- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'key1;key2'
    env_value: 'value1;value2'
    delimiter: ';'

Common Use Cases

1. Multi-Region Deployment

- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'GCP_REGION,AWS_REGION,AZURE_REGION'
    env_value: 'asia-northeast1,us-east-1,eastasia'

1. Environment Configuration

- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'ENV,STAGE,VERSION'
    env_value: 'production,prod,v1.0.0'

1. Status Tracking

- uses: somaz94/env-output-setter@v1
  with:
    output_key: 'DEPLOY_STATUS,TEST_STATUS'
    output_value: 'success,passed'

Value Transformation and Masking

This action supports value transformation and masking of sensitive data:

Features

• Mask sensitive values in logs
• Convert values to uppercase/lowercase
• URL encode values
• Custom masking patterns using regex

Example Usage

- uses: somaz94/env-output-setter@v1
  with:
    env_key: 'API_KEY,USERNAME,PASSWORD'
    env_value: 'secret123,admin,pass123'
    mask_secrets: 'true' # Masks sensitive values
    mask_pattern: '(password|secret).' # Custom masking pattern
    to_upper: 'true' # Convert to uppercase
    to_lower: 'false' # Convert to lowercase
    encode_url: 'false' # URL encode values

Masking Behavior

• When mask_secrets is enabled, sensitive values are masked in logs
• Custom mask_pattern allows regex-based masking
• Default masking shows first 2 characters followed by asterisks
• Short values (<4 characters) are completely masked

Value Transformations

• to_upper: Converts values to uppercase
• to_lower: Converts values to lowercase
• encode_url: Applies URL encoding to values
• Transformations are applied in order: case conversion -> URL encoding

Note: Masking only affects log output, not the actual values set in environment variables or outputs.

Troubleshooting

Common issues and solutions:

1. Duplicate Keys

   • Error message: duplicate key found: KEY_NAME
   • Solution: Ensure all keys are unique or set error_on_duplicate: 'false'

2. Empty Values

   • Error message: empty value found for key: KEY_NAME
   • Solution: Provide values for all keys or set fail_on_empty: 'false'

3. File Write Issues

   • Error message: failed to write to file
   • Solution: Action will automatically retry up to 3 times

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.