--- sidebar_label: engine --- # alpha.dagger.io/europa/dagger/engine/spec/engine ```cue import "alpha.dagger.io/europa/dagger/engine/spec/engine" ``` ## engine.#Build Build a container image using buildkit ### engine.#Build Inputs _No input._ ### engine.#Build Outputs _No output._ ## engine.#CacheDir A (best effort) persistent cache dir ### engine.#CacheDir Inputs _No input._ ### engine.#CacheDir Outputs _No output._ ## engine.#Context ### engine.#Context Inputs _No input._ ### engine.#Context Outputs _No output._ ## engine.#Copy ### engine.#Copy Inputs _No input._ ### engine.#Copy Outputs _No output._ ## engine.#CopyInfo ### engine.#CopyInfo Inputs _No input._ ### engine.#CopyInfo Outputs _No output._ ## engine.#Exec Execute a command in a container ### engine.#Exec Inputs _No input._ ### engine.#Exec Outputs _No output._ ## engine.#FS A reference to a filesystem tree. For example: - The root filesystem of a container - A source code repository - A directory containing binary artifacts Rule of thumb: if it fits in a tar archive, it fits in a #FS. A filesystem state ### engine.#FS Inputs _No input._ ### engine.#FS Outputs _No output._ ## engine.#GitPull Pull a directory from a git remote ### engine.#GitPull Inputs _No input._ ### engine.#GitPull Outputs _No output._ ## engine.#GitPush Push a directory to a git remote ### engine.#GitPush Inputs _No input._ ### engine.#GitPush Outputs _No output._ ## engine.#ImageConfig Container image config. See [OCI](https://www.opencontainers.org/). Spec left open on purpose to account for additional fields. [Image Spec](https://github.com/opencontainers/image-spec/blob/main/specs-go/v1/config.go) [Docker Superset](https://github.com/moby/buildkit/blob/master/frontend/dockerfile/dockerfile2llb/image.go) Container image config See [OCI](https://www.opencontainers.org) ### engine.#ImageConfig Inputs _No input._ ### engine.#ImageConfig Outputs _No output._ ## engine.#Merge ### engine.#Merge Inputs _No input._ ### engine.#Merge Outputs _No output._ ## engine.#Mount A transient filesystem mount. ### engine.#Mount Inputs _No input._ ### engine.#Mount Outputs _No output._ ## engine.#Plan A deployment plan executed by `dagger up` ### engine.#Plan Inputs _No input._ ### engine.#Plan Outputs _No output._ ## engine.#Pull Download a container image from a remote repository ### engine.#Pull Inputs _No input._ ### engine.#Pull Outputs _No output._ ## engine.#Push Upload a container image to a remote repository ### engine.#Push Inputs _No input._ ### engine.#Push Outputs _No output._ ## engine.#ReadFile ### engine.#ReadFile Inputs _No input._ ### engine.#ReadFile Outputs _No output._ ## engine.#Scratch Produce an empty directory ### engine.#Scratch Inputs _No input._ ### engine.#Scratch Outputs _No output._ ## engine.#Secret A reference to an external secret, for example: - A password - A SSH private key - An API token Secrets are never merged in the Cue tree. They can only be used by a special filesystem mount designed to minimize leak risk. An external secret ### engine.#Secret Inputs _No input._ ### engine.#Secret Outputs _No output._ ## engine.#Service A reference to a network service endpoint, for example: - A TCP or UDP port - A unix or npipe socket - An HTTPS endpoint An external network service ### engine.#Service Inputs _No input._ ### engine.#Service Outputs _No output._ ## engine.#Stream A stream of bytes ### engine.#Stream Inputs _No input._ ### engine.#Stream Outputs _No output._ ## engine.#TempDir A temporary directory for command execution ### engine.#TempDir Inputs _No input._ ### engine.#TempDir Outputs _No output._ ## engine.#WriteFile ### engine.#WriteFile Inputs _No input._ ### engine.#WriteFile Outputs _No output._