Buildkit for Windows – Working with relative paths in COPY/ADD

[fabiang]

Hi

I'm unable to figure out how to work with relative paths in COPY when testing a complex Dockerfile under Windows.

My folder structure is the following:

│
├───go
│       tools
│
└───windows
    │
    └───golang
            Dockerfile

The command (from the root directory):

buildctl --debug build `
  --frontend=dockerfile.v0 `
  --local context=. `
  --local dockerfile=windows/golang `
  --opt build-arg:GOLANG_VERSION=1.21.1-windowsservercore-ltsc2022

Dockerfile

# escape=`
ARG GOLANG_VERSION=1.21-windowsservercore-ltcs2022
FROM golang:$GOLANG_VERSION
USER ContainerAdministrator

COPY ./go/tools C:/Windows/temp/tools

The correct Dockerfile is found and build, but the file tools can't be loaded into the build context: error: failed to solve: unclean path go/tools: invalid argument
When everything is on the same exact folder it's actually working. Is this a bug or do I need to add the folder go explicit with --local?

Some info:

PS C:\> [System.Environment]::OSVersion.Version

Major  Minor  Build  Revision
-----  -----  -----  --------
10     0      20348  0

PS C:\> containerd.exe --version
containerd github.com/containerd/containerd v1.7.14 dcf2847247e18caba8dce86522029642f60fe96b

PS C:\> buildkitd.exe --version
buildkitd github.com/moby/buildkit v0.13.1 2ae42e0c0c793d7d66b7a23424af6fd6c2f9c8f3

Thanks

[fruzitent]

fixed in 108cd50

[profnandaa]

Sure, that is now fixed, should be ready on the next release. Thanks for checking out the project!