53 lines
5.8 KiB
Markdown
53 lines
5.8 KiB
Markdown
---
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slug: /1222/core-actions-reference
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displayed_sidebar: europa
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---
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# Core Actions Reference
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Core Actions are primitives implemented by the Dagger Engine itself. They can be combined into higher-level composite actions. Their definitions can be imported in the `dagger.io/dagger/core` package.
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For more information about Dagger Actions, see [Dagger Actions](../core-concepts/1221-action).
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The following core actions are available:
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## Core Actions related to filesystem trees
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| Definition | File | Description |
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| :-- | :-- | :-- |
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| `#Copy` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Copy files between two filesystem trees |
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| `#Diff` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Extract the difference between two filesystems as its own file system |
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| `#Merge` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Merge multiple filesystem trees |
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| `#Mkdir` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Create a directory in a filesystem tree |
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| `#ReadFile` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Read a file from a filesystem tree |
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| `#Scratch` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Create an empty filesystem tree |
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| `#Source` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Access the source for the current CUE package |
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| `#Subdir` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Read a subdirectory from a filesystem tree |
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| `#WriteFile` | [fs.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/fs.cue) | Write a file to a filesystem tree |
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## Core Actions related to secrets
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| Definition | File | Description |
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| :-- | :-- | :-- |
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| `#DecodeSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Decode a secret without leaking its contents |
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| `#NewSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Create a new a secret from a filesystem tree |
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| `#TrimSecret` | [secrets.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/secrets.cue) | Trim leading and trailing space characters from a secret |
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## Core Actions related to containers
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| Definition | File | Description |
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| :-- | :-- | :-- |
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| `#Dockerfile` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Build a container image using a Dockerfile |
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| `#Exec` | [exec.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/exec.cue) | Execute a command in a docker-compatible container |
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| `#Export` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Export a docker image as a tar archive |
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| `#Pull` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Download an image from a docker registry |
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| `#Push` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Upload an image to a docker registry |
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| `#Set` | [image.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/image.cue) | Modify a docker image config |
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## Core Actions related to remote data sources
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| Definition | File | Description |
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| :-- | :-- | :-- |
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| `#GitPull` | [git.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/git.cue) | Download a repository from a remote git server |
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| `#HTTPFetch` | [http.cue](https://github.com/dagger/dagger/blob/v0.2.4/pkg/dagger.io/dagger/core/http.cue) | Get a file from an HTTP server |
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