Ubuntu Chiseled Dotnet

[turowicz]

Summary of your issue

I am trying to compile OpenCV and OpenCVSharp like the examples found here https://github.com/shimat/opencvsharp/tree/master/docker and at the very end copy it from builder to https://hub.docker.com/r/ubuntu/dotnet-deps image, so I can run my self-contained application in a non-root mode without any system/tooling unnecessary garbage.

Environment

Image ubuntu/dotnet-deps:7.0_edge with my application compiled as self-contained for a specific architecture (amd64/arm64).

Example code:

Runtime image:

FROM --platform=$BUILDPLATFORM registry.***.com/developer.dotnet:base as base
ARG TARGETARCH
ARG BUILDPLATFORM

RUN echo "Target: $TARGETARCH"
RUN echo "Build: $BUILDPLATFORM"

FROM --platform=$BUILDPLATFORM ubuntu/dotnet-deps:${version}_edge
ARG TARGETARCH
ARG BUILDPLATFORM

COPY --from=base /usr/lib /usr/lib

Application image:

ARG commit
FROM --platform=$BUILDPLATFORM registry.***.com/build:backend-${commit} AS build-env
ARG project
ARG TARGETARCH
ARG BUILDPLATFORM

ENV PROJECT=${project}

RUN echo "Target: $TARGETARCH"
RUN echo "Build: $BUILDPLATFORM"

RUN dotnet publish src/${project}/${project}.csproj -c Release -o out/ --self-contained true -a $TARGETARCH
RUN cd out && ln -s $PROJECT application

# Build runtime image
FROM registry.***.com/developer.dotnet:7.0

# Prepare Application
WORKDIR /app

COPY --from=build-env /home/app/out .
USER app

# Prepare Entry
ENTRYPOINT ["/app/application"]

Output:

The type initializer for 'OpenCvSharp.Internal.NativeMethods' threw an exception.
System.TypeInitializationException: The type initializer for 'OpenCvSharp.Internal.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'OpenCvSharpExtern' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you're using glibc, consider setting the LD_DEBUG environment variable: 
/app/OpenCvSharpExtern.so: cannot open shared object file: No such file or directory
libopencv_stitching.so.407: cannot open shared object file: No such file or directory
libOpenCvSharpExtern.so: cannot open shared object file: No such file or directory
/app/OpenCvSharpExtern: cannot open shared object file: No such file or directory
/app/libOpenCvSharpExtern: cannot open shared object file: No such file or directory

What did you intend to be?

I am now debugging with LD_DEBUG=libs to figure out where to put the files so the self-contained application finds the libs but I was wondering if you didn't already have a dockerfile for this prepared?

[turowicz]

cc @shimat

[turowicz]

sorted by placing required libs in the right folders