Calling Functions

dagger check, dagger generate, and dagger up are conveniences built on top of the underlying primitive: calling a module's functions. When you need something those verbs don't cover, call functions directly.

dagger call jest test

dagger call is shorthand for dagger function call.

Discover functions

List the functions available in your workspace:

dagger function list

List the functions on a specific module:

dagger function list jest

Every function and its arguments are also visible through --help:

dagger call jest --help

Pass arguments

Arguments are flags on the function that accepts them:

dagger call jest --package-manager=yarn test

Secrets are passed the same way, via provider URIs — see Secrets:

dagger call deploy --token=env:DEPLOY_TOKEN

Chain functions

Functions interconnect into a pipeline. Each function returns an object, and the next function is called on that result:

dagger -m core call container \
  from --address=alpine \
  with-exec --args=echo,hello \
  stdout

Output

By default the result is printed to your terminal. Format it as JSON:

dagger call jest test --json

Or save a returned file or directory to the host:

dagger call build --output=./dist