fix: pass build platform to Docker pull to avoid tarball fallback#436
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PedroGuerraPT merged 1 commit intomainfrom Feb 23, 2026
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jacobwgillespie
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Feb 23, 2026
When using --build-platform=linux/amd64 on an arm64 host, the Docker pull defaulted to the host architecture (arm64) and failed with "no matching manifest for linux/arm64/v8", causing a slow tarball fallback. Pass --build-platform as the pull platform so Docker requests the correct architecture manifest from the registry.
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jacobwgillespie
approved these changes
Feb 23, 2026
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Summary
depot bake --build-platform=linux/amd64 --loadon an arm64 Mac, the Docker pull defaults to the host architecture (arm64) and fails with "no matching manifest for linux/arm64/v8", causing a slow tarball fallback--build-platformflag controls which builder machine is used but was never passed through to the DockerImagePullcall, so Docker didn't know which architecture to request from the registryBuildPlatformtoDepotLoadOptionsand uses it as a fallback platform whenbuildOpt.Platforms(the composeplatformsfield) is emptyChanges
pkg/load/cli.go— addedBuildPlatformfield toDepotLoadOptions; whenbuildOpt.Platformsis empty and--build-platformis set, pass it as the pull platformpkg/buildx/commands/bake.go— passbuildPlatformthrough toDepotLoadOptionspkg/buildx/commands/build.go— passbuildPlatformthrough toDepotLoadOptionsTest plan
depot bake --build-platform=linux/amd64 --loadon arm64 Mac now pulls withplatform="linux/amd64"and avoids tarball fallbackplatformsfield still use that value (takes precedence)Fixes DEP-3616