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Exercise: Task inputs

In this exercise we learn how to configure inputs for tasks in nx.

0. Get to know the problem

We currently have a problem. Take a look at the deploy target of the movies app. It has a dependency to the tools/deploy/frontend.Dockerfile.

If you do any change to the frontend.Dockerfile, the deploy command won't be affected at all.

Change to tools/deploy/frontend.Dockerfile 
FROM nginx:1.21.4-alpine
ARG APP_NAME

RUN adduser -D -g 'www' www

COPY tools/deploy/nginx.conf /etc/nginx/nginx.conf
COPY dist/apps/$APP_NAME/browser /usr/share/nginx/html

# this is just a comment 👈️ should be enough

CMD ["nginx", "-g", "daemon off;"]
EXPOSE 80

You can confirm bey either watching the affected task graph or actually run the affected:deploy command.

Tip

Please confirm that your git is currently clean. You should not have other changes locally

Affected Task Graph 
nx affected -t deploy --graph

1. Introduce task inputs

The missing piece are of course the right inputs for the task.

1.1 namedInputs for dockerFiles

First, create a section namedSections that has a configuration for a dockerFiles input that points to the dockerfile we are using for the deployment.

Go to the project.json of the movies app.

Configure namedInputs 
// apps/movies/project.json
{
  "namedInputs": {
    "dockerFiles": ["{workspaceRoot}/tools/deploy/frontend.Dockerfile"]
  },
}

1.2 use the namedInputs in the target

Configure the deploy target of the movies app so that it uses the newly created namedInputs.

We want to make it right directly in the beginning, so please also add the following options to the inputs:

{ "dependentTasksOutputFiles": "**/dist/**/*", "transitive": true }
use the namedInputs in the target 
{
  "inputs": [
    "dockerFiles",
    { "dependentTasksOutputFiles": "**/dist/**/*", "transitive": true }
  ],
}

2. Use task inputs

2.1 Commit the project.json

Now you should commit only the project.json so that your branch is again clean, but the changes you've done to the .Dockerfile

git add apps/movies/project.json
git commit -m "fix inputs for deploy target"

2.2 confirm deploy is affected now

Now the deploy target should be affected when there is a change to the .Dockerfile.