Add docker build tooling to help build a local set of working libraries

contrib/Makefile

@@ -0,0 +1,8 @@
+BUILD_DIR := $(dir $(abspath $(firstword $(MAKEFILE_LIST))))
+DOCKER := $(shell test -x /usr/bin/podman && echo podman || echo docker)
+
+build-ubuntu: 22.04
+
+18.04 20.04 22.04 24.04:
+	$(DOCKER) build -f $(BUILD_DIR)/build-ubuntu.Dockerfile --build-arg RELEASE=$@ -t build-awscred-lib .
+	$(DOCKER) run -ti --rm -v ./:/build build-awscred-lib

contrib/README.md

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+# Helpers for building s3fs-fuse-awscred-lib
+
+The tools in this directory can be used to build the library locally, so it can either
+be installed manually or just used from the current directory.
+
+## Requirements:
+
+ - Linux
+ - Docker, Podman or an alternative container runtime
+ - GNU Make (optional, read `Makefile` for alternative instructions)
+
+## Usage
+
+The provided `Makefile` currently supports building for the currently supported
+Ubuntu LTS versions.
+
+To build all the required binaries, including the test tool, and copy them into the
+current directory, run:
+
+`make -f contrib/Makefile [UBUNTU_VERSION]`
+
+where `UBUNTU_VERSION` is optional and can be an LTS version number such as `20.04`.
+If not specified, `22.04` is used (which is the current latest LTS release).
+
+After the build is complete, the resulting `.so` files can be manually copied to
+someplace in the dynamic linker path (for example `/usr/local/lib`) or can be
+loaded directly by setting the environment variable `LD_LIBRARY_PATH` for the
+`s3fs` command, e.g. `LD_LIBRARY_PATH=. s3fs …`

contrib/build-ubuntu.Dockerfile

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+ARG RELEASE=20.04
+FROM ubuntu:$RELEASE
+ARG RELEASE=20.04
+ENV DEBIAN_FRONTEND=noninteractive
+ADD ./ /src/s3fs-fuse-awscred-lib
+WORKDIR /src/s3fs-fuse-awscred-lib
+RUN .github/workflows/linux-ci-helper.sh ubuntu:${RELEASE}
+RUN mkdir -p /src/aws-sdk/sdk_build
+WORKDIR /src/aws-sdk
+RUN git clone --recurse-submodules https://github.com/aws/aws-sdk-cpp
+WORKDIR /src/aws-sdk/sdk_build
+RUN cmake ../aws-sdk-cpp -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=${PWD} -DBUILD_ONLY="core;identity-management" -DAUTORUN_UNIT_TESTS=OFF
+RUN make
+RUN make install
+WORKDIR /src/s3fs-fuse-awscred-lib
+RUN cmake -S . -B build
+RUN cmake --build build
+VOLUME /build
+CMD mkdir -p /build && cp /src/s3fs-fuse-awscred-lib/build/libs3fsawscred.so \
+	/src/s3fs-fuse-awscred-lib/build/s3fsawscred_test \
+	/usr/local/lib/libaws-cpp-sdk-identity-management.so \
+	/usr/local/lib/libaws-cpp-sdk-core.so \
+	/usr/local/lib/libaws-cpp-sdk-cognito-identity.so \
+	/usr/local/lib/libaws-cpp-sdk-sts.so \
+	/build