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tonistiigi merged 1 commit into from
Dec 3, 2025
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docs: ADD --checksum supports git sources #6392

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13 changes: 8 additions & 5 deletions frontend/dockerfile/docs/reference.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1573,16 +1573,19 @@ ADD --keep-git-dir=true https://github.com/moby/buildkit.git#v0.10.1 /buildkit
ADD [--checksum=<hash>] <src> ... <dir>
```

The `--checksum` flag lets you verify the checksum of a remote resource. The
checksum is formatted as `sha256:<hash>`. SHA-256 is the only supported hash
algorithm.
The `--checksum` flag lets you verify the checksum of a remote Git or HTTP
resource:

- For Git sources, the checksum is the commit SHA. It can be the full commit
SHA or match on the prefix (1 or more characters).
- For HTTP sources, the checksum is the SHA-256 content digest, formatted as
`sha256:<hash>`. SHA-256 is the only supported hash algorithm.

```dockerfile
ADD --checksum=be1f38e https://github.com/moby/buildkit.git#v0.26.2 /
ADD --checksum=sha256:24454f830cdb571e2c4ad15481119c43b3cafd48dd869a9b2945d1036d1dc68d https://mirrors.edge.kernel.org/pub/linux/kernel/Historic/linux-0.01.tar.gz /
```

The `--checksum` flag only supports HTTP(S) sources.

### ADD --chown --chmod

See [`COPY --chown --chmod`](#copy---chown---chmod).
Expand Down