Dockerfile Project Help Needed

[DragonOsman]

I need some help on a Dockerfile project based on the app I made. I got an error saying that there's no such file or directory as nlohmann/json.hpp. I got similar errors for Jinja2Cpp, but I'll ask that on their GitHub rather than here (though if someone here can help me with that, then that's even better for me).

The command I'm using in the Dockerfile to compile my executable is:

RUN g++ -std=c++17 -Wall -pedantic -I /usr/local/jinja2cpp/install/include -I /usr/local/boost_1_68_0/ -I /usr/local/json/single_include/ -L /usr/local/jinja2cpp/build/ -llibjinja2cpp.* -L /usr/local/boost_1_68_0/stage/lib/ -llibboost_system.* currency_converter.cpp -o currency_converter

The error from g++ during the Dockerfile build process is:

currency_converter.cpp:29:10: fatal error: nlohmann/json.hpp: No such file or directory
 #include <nlohmann/json.hpp>
          ^~~~~~~~~~~~~~~~~~~
compilation terminated.

This is my code (I posted it on GitHub as well): https://github.com/DragonOsman/currency_converter/blob/master/currency_converter.cpp .

Any help is appreciated. Thanks.

[nlohmann]

As you passed -I /usr/local/json/single_include, can you make sure the file /usr/local/json/single_include/nlohmann/json.hpp exists?

[Manu343726]

As noted in jinja2cpp/Jinja2Cpp#70, looking at your Dockerfile and its build script would help to diagnose the problem.

[DragonOsman]

Okay, I took out the flag to bring in nlohmann/json from the regular include directory and kept just the single_include one, but I still have that error. Relevant part of the Dockerfile build output is:

Cloning into 'json'...
Checking out files: 100% (1804/1804), done.
Removing intermediate container c6b8c75af70e
 ---> a122c5924902
Step 8/12 : RUN g++ -std=c++14 -Wall -pedantic -I app/jinja2cpp/install/include -I app/json/single_include -I /usr/local/include/ -I app/jinja2cpp/thirdparty/nonstd/value-ptr-lite/include currency_converter.cpp -L app/jinja2cpp/install/lib/static -ljinja2cpp -L usr/local/lib -lboost_system -lpthread -o currency_converter
 ---> Running in bdbf146fe3b5
currency_converter.cpp:29:10: fatal error: nlohmann/json.hpp: No such file or directory
 #include <nlohmann/json.hpp>
          ^~~~~~~~~~~~~~~~~~~
compilation terminated.

And the Dockerfile itself is:

FROM ubuntu:18.04
WORKDIR /app
COPY /scripts /styles index.html currency_converter.cpp /app/
RUN apt-get update \
  && apt-get install -y git \
                        g++ \
                        build-essential \
                        make \
                        wget \
                        cmake
RUN wget https://dl.bintray.com/boostorg/release/1.68.0/source/boost_1_68_0.tar.bz2 \
    && tar -xjf boost_1_68_0.tar.bz2 \
    && rm -rf boost_1_68_0.tar.bz2 \
    && cd boost_1_68_0 \
    && ./bootstrap.sh \ 
    && ./b2 install
RUN git clone https://github.com/flexferrum/jinja2cpp \ 
    && cd jinja2cpp \
    && git submodule -q update --init \ 
    && mkdir build \ 
    && cd build \
    && cmake .. -DCMAKE_INSTALL_PREFIX=../install \
    && cmake --build . --target all
RUN git clone https://github.com/nlohmann/json
RUN g++ -std=c++14 -Wall -pedantic -I app/jinja2cpp/install/include -I app/json/single_include -I /usr/local/include/ -I app/jinja2cpp/thirdparty/nonstd/value-ptr-lite/include currency_converter.cpp -L app/jinja2cpp/install/lib/static -ljinja2cpp -L usr/local/lib -lboost_system -lpthread -o currency_converter
EXPOSE 80
ENV apikey <APIKEY>
ENV accesskey <ACCESSKEY>
CMD ["./currency_converter", "0.0.0.0", "8080", "."]

[nlohmann]

What is the content of app/json/single_include?

[DragonOsman]

Let me check and get back to you (I'll update this comment).

Edit: Yes, the nlohmann directory is in there. And I think it has json.hpp in it, but I'll check just in case.

Edit2: As I thought, it's in there. So what do I do about this? It's saying the file isn't there, but it is.

Will it work if I do it like this: ./json/single_include?

[nlohmann]

Your compiler cannot find the JSON header. This has nothing to do with this library or Docker, but is a standard C++ problem. Can you try to compile a smaller program that only includes nlohmann/json.hpp?