feat: add --source-policy-file flag to nerdctl build #4712
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Add support for BuildKit source policies via `nerdctl build --source-policy-file`. This enables reproducible and policy-driven builds (pin base images to digests, deny/allow sources, enforce HTTP checksums) without modifying Dockerfiles. The implementation: - Adds --source-policy-file flag that passes through to buildctl - Supports EXPERIMENTAL_BUILDKIT_SOURCE_POLICY env var for Docker Buildx compatibility - Flag takes precedence over env var when both are set This is a minimal passthrough to BuildKit - nerdctl does not validate the policy file; BuildKit handles all validation and error messages. See: https://github.com/moby/buildkit/blob/master/docs/build-repro.md Signed-off-by: Konstantin Vyatkin <tino@vtkn.io> Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
--source-policy-fileflag tonerdctl buildthat passes through tobuildctl build --source-policy-fileEXPERIMENTAL_BUILDKIT_SOURCE_POLICYenvironment variable for Docker Buildx compatibilityThis enables BuildKit source policies for reproducible and policy-driven builds (pin base images to digests, deny/allow sources, enforce HTTP checksums) without modifying Dockerfiles.
Implementation Details
This is a minimal passthrough to BuildKit - nerdctl does not validate the policy file; BuildKit handles all validation and error messages.
Files changed:
pkg/api/types/builder_types.go: AddedSourcePolicyFilefield toBuilderBuildOptionscmd/nerdctl/builder/builder_build.go: Added--source-policy-fileflag and wiringpkg/cmd/builder/build.go: Pass through to buildctl with env var fallbackpkg/cmd/builder/build_test.go: Unit tests for precedence logicdocs/command-reference.md: DocumentationUsage
Test plan
References