carp-docker

Dockerfiles for Carp development, and trying out Carp without installing!

The following Dockerfiles are provided:

• carplang/carp:latest — a native executable or C build host
• carplang/carp:emcc — carplang/carp:latest extended with WASM/ASM.js build host capabilities

Try it!

If you have Docker installed, playing around with Carp is as easy as running:

docker run -it --rm carplang/carp

This will give you a shell in which you can play around with Carp. To verify Carp works as intended, you can try typing:

(defn main [] (IO.println "hi"))

in the REPL. Nothing will happen, but if you build it by typing :bx, hi should be printed to your screen! Amazing, right?

Use it!

As a base image:

You can also use this image as a base image for your Carp-related Docker projects. This is as simple as starting your Dockerfile with:

FROM carplang/carp:latest

Or package only your app:

FROM carplang/carp:latest as builder

COPY example/hello_world.carp /mnt/app/

RUN carp -b hello_world.carp

FROM scratch

COPY --from=builder /mnt/app/out/HelloWorld /usr/local/bin/

ENTRYPOINT ["/usr/local/bin/HelloWorld"]

You can then build your program using docker build -t hello_carp -f <DOCKERFILE_NAME> . and run it using docker run --rm hello_carp!

As a build host

To build .c files and compile them to a native executable, first run the following from the repository root:

docker run -v $(pwd)/example:/mnt/app \
           --user 1000:1000 \
           --rm \
           carplang/carp:latest \
           carp -b hello_world.carp

Then you can run the resulting executable from the host, if it's x64 Linux with glibc:

./example/out/HelloWorld

As a WASM/ASM.js build host

To generate the web files, run the following after executing the build step that produces the .c files from above:

docker run -v $(pwd)/example/out/:/mnt/app \
            --rm \
            -ti \
            carplang/carp:emcc \
            emcc main.c \
                 -s WASM=1 \
                 -I/opt/carp/core \
                 -o hello.html \
                 --emrun

You can serve the website directly from Docker afterwards!

docker run -v $(pwd)/example/out/:/mnt/app \
           --rm \
           -ti \
           --net=host \
           carplang/carp:emcc \
           emrun --no_browser \
                 --port 8080 \
                 hello.html

The above will open port 8080 and serve the produced files there. This means that you should be able to go to http://localhost:8080/hello.html and see your app if your browser supports WASM!

---

Have fun!