"Portable" Odin build

Containerfile

# Container file to build a "portable" odin installation across Linux
# distributions. Bundles required .so files in one folder including the
# interpreter. Keep in mind Odin still requires clang (>=11) to be installed,
# this might change in the future
#
# Step 1: Build the image
# podman build -t odin-linux . --build-arg BUILD_TYPE=release
#
# Step 2: Run the image
# podman run --name Odin localhost/odin-linux:latest
#
# Step 3: The container environment is not meant to be used, just copy the tarball
# podman cp Odin:/odin/odin-linux.tgz .
#
# Step 4: Remove the image
# podman rm --force Odin
#
# Step 5: Profit?
# You should have the odin magic tarball in your current working dir, if you
# have patchelf installed, it is highly recommended that you use the relocate
# script to the desired directory (I recommend just using `./lib`), otherwhise
# you'll only be able to run the odin executable from within the folder because
# of the hard-coded musl-loader.
#
# Step 6: OPTIONAL, cleanup the mess, only do this if you know what these commands do:
# podman container prune --force & podman container cleanup --rm --rmi --all

ENV BUILD_TYPE="release"
ENV CXX="clang++-17"
ENV LLVM_CONFIG="llvm-config-17"

FROM alpine:3.19

WORKDIR /

RUN apk add \
    git make musl-dev patchelf \
    llvm17 clang17 llvm17-dev

RUN git clone https://github.com/odin-lang/Odin --depth=1 odin

WORKDIR /odin

RUN ./build_odin.sh ${BUILD_TYPE}

RUN mkdir -p .dist/lib

RUN cp /lib/ld-musl-x86_64.so.1      .dist/lib \
    && cp /usr/lib/libstdc++.so.6    .dist/lib \
    && cp ./libLLVM-17.so            .dist/lib \
    && cp /usr/lib/libgcc_s.so.1     .dist/lib \
    && cp /usr/lib/libffi.so.8       .dist/lib \
    && cp /lib/libz.so.1             .dist/lib \
    && cp /usr/lib/libzstd.so.1      .dist/lib \
    && cp /usr/lib/libxml2.so.2      .dist/lib \
    && cp /usr/lib/liblzma.so.5      .dist/lib \
    && cp /usr/lib/liblzma.so.5      .dist/lib \
    && cp /lib/libc.musl-x86_64.so.1 .dist/lib 

RUN echo '#!/usr/bin/env sh'                                  >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'targetDir="$1"'                                  >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'test -z "$targetDir" && {'                       >> .reloc \
    && echo '  echo "$0 [DIR]"'                               >> .reloc \
    && echo '  exit 1'                                        >> .reloc \
    && echo '}'                                               >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'set -e'                                          >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'orig="$(readlink -f ./lib/ld-musl-x86_64.so.1)"' >> .reloc \
    && echo 'targetDir="$(readlink -f "$targetDir")"'         >> .reloc \
    && echo 'loader="$targetDir/ld-musl-x86_64.so.1"'         >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'test "$orig" != "$loader" \'                     >> .reloc \
    && echo '  && cp ./lib/ld-musl-x86_64.so.1 "$targetDir"'  >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'patchelf --set-interpreter "$loader" odin'       >> .reloc \
    && echo ''                                                >> .reloc \
    && echo 'echo "Relocated loader for odin to $loader"'     >> .reloc

RUN mv .reloc .dist/relocate-odin.sh

# Just to make sure
RUN chmod +x .dist/lib/lib* .dist/relocate-odin.sh

RUN cp odin         .dist \
    && cp LICENSE   .dist \
    && cp -r core   .dist \
    && cp -r vendor .dist

RUN patchelf --set-rpath '$ORIGIN/lib/' .dist/lib/lib*

# NOTE: This will require the odin executable to be run within the folder
# always, it is possible to relocate it later with patchelf for convenience
RUN patchelf --set-interpreter './lib/ld-musl-x86_64.so.1' .dist/odin

RUN mv .dist odin-linux \
    && tar czf odin-linux.tgz odin-linux

ENTRYPOINT /bin/sh -c 'echo "The build is already done, copy the file /odin/odin-linux.tgz out of the container."; read _ '