57 lines
2.2 KiB
Markdown
57 lines
2.2 KiB
Markdown
---
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description: |
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The checksum post-processor computes specified checksum for the artifact list
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from an upstream builder or post-processor. All downstream post-processors
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will see the new artifacts. The primary use-case is compute checksum for
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artifacts allows to verify it later. So firstly this post-processor get
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artifact, compute it checksum and pass to next post-processor original
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artifacts and checksum files.
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layout: docs
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page_title: 'Checksum - Post-Processors'
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sidebar_current: 'docs-post-processors-checksum'
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---
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# Checksum Post-Processor
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Type: `checksum`
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The checksum post-processor computes specified checksum for the artifact list
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from an upstream builder or post-processor. All downstream post-processors will
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see the new artifacts. The primary use-case is compute checksum for artifact to
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verify it later.
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After computes checksum for artifacts, you can use new artifacts with other
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post-processors like
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[artifice](https://www.packer.io/docs/post-processors/artifice.html),
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[compress](https://www.packer.io/docs/post-processors/compress.html),
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[docker-push](https://www.packer.io/docs/post-processors/docker-push.html),
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[atlas](https://www.packer.io/docs/post-processors/atlas.html), or a third-party
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post-processor.
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## Basic example
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The example below is fully functional.
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``` json
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{
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"type": "checksum"
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}
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```
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## Configuration Reference
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Optional parameters:
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- `checksum_types` (array of strings) - An array of strings of checksum types
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to compute. Allowed values are md5, sha1, sha224, sha256, sha384, sha512.
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- `output` (string) - Specify filename to store checksums. This defaults to
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`packer_{{.BuildName}}_{{.BuilderType}}_{{.ChecksumType}}.checksum`. For
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example, if you had a builder named `database`, you might see the file
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written as `packer_database_docker_md5.checksum`. The following variables are
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available to use in the output template:
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- `BuildName`: The name of the builder that produced the artifact.
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- `BuilderType`: The type of builder used to produce the artifact.
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- `ChecksumType`: The type of checksums the file contains. This should be
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used if you have more than one value in `checksum_types`.
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