Task Dependencies & Parallel Task Execution

Task Dependencies

Run task in specific order

If you want to run tasks in a specific order or run serially, then you can refer to run task in specific order.

Dependencies actually run in parallel, so dependencies are not guaranteed to run in order. You can achieve this by using the deps keyword in your Taskfile.

Single Task Dependency

Taskfile.yml


version: '3'
tasks:
  build:
    deps: [lint]
    desc: Build the project
    cmds:
      - echo "Building the project..."
 
  lint:
    desc: Lint the code
    cmds:
      - echo "Linting code..."

In this case, the lint task will run before the build task, ensuring that the code is linted before building it.

Demo and Output


ubuntu@touted-mite:~$ task build
task: [lint] echo "Linting code..."
Linting code...
task: [build] echo "Building the project..."
Building the project...

Multiple Task Dependencies

Taskfile.yml


version: '3'
tasks:
  build:
    desc: Build the project
    cmds:
      - echo "Building the project..."
 
  test:
    desc: Run tests
    cmds:
      - echo "Running tests..."
 
  lint:
    desc: Lint the code
    cmds:
      - echo "Linting code..."
 
  all:
    desc: Run lint, build, and test in order
    deps:
      - lint
      - build
      - test
      # - example
      #   vars:
      #     EXAMPLE_VAR: "example value"
    cmds:
      - echo "All tasks completed!"

You can also pass variable to dependencies. Is the same concept as passing variables to tasks.

It does not guaranteed that lint will run before build or test, but it ensures that all tasks are executed before the all task completes.

Demo and Output


ubuntu@touted-mite:~$ task all
task: [test] echo "Running tests..."
task: [build] echo "Building the project..."
task: [lint] echo "Linting code..."
Building the project...
Running tests...
Linting code...
task: [all] echo "All tasks completed!"
All tasks completed!

Parallel Task Execution

Parallel task execution allows you to run multiple tasks concurrently, which can significantly speed up your workflow, especially for tasks that are independent of each other.

Taskfile.yml


version: '3'
tasks:
  app:
    dir: ./app
    cmds:
      - docker build -t app:latest ./
  app1:
    dir: ./app1
    cmds:
      - docker build -t app1:latest ./


task --parallel app app1