使用Golang API构建Docker映像时复制失败

Question

I'm trying to build a Docker Image using the official GO API, but I run into a problem on this line:

COPY packages /tmp/packages

of

"message":"COPY failed: stat /var/lib/docker/tmp/docker-builder107969114/packages: no such file or directory"

Where packages is a folder in the directory where the docker file resides.

If I just build a docker image build to the path of the Dockerfile it builds as expected.

I tried adding a WORKDIR to the path where the Dockerfile is in the actual Dockerfile but it still seems like it can't find the folder.

Does anyone know what's going on here?

Answer 1

If anyone else encounters into this problem, if you have any mounts for your host config like:

&container.HostConfig{
    Mounts:[]mount.Mount{
        {
            Source: .../somePath,
            Target: .../somePath,
        }
    }
}

That you built the image with the correct build context:

cli.ImageBuild(context.Background(), tarFile, types.ImageBuildOptions{})

That within the tarFile that you're passing, .../somePath exists.