Docker build with cache

Dockerfile

FROM alpine

WORKDIR /root

ENV PATH="/root/spack/bin:$PATH" SPACK_COLOR=always

# Setup spack and its deps
RUN apk add gcc g++ gfortran make file tar curl python3 patch unzip gnupg git xz python3-dev py3-pip linux-headers && \
    pip install clingo

# make version 4.4 please
RUN curl -Lfs https://github.com/JuliaBinaryWrappers/GNUMake_jll.jl/releases/download/GNUMake-v4.4.0%2B0/GNUMake.v4.4.0.x86_64-linux-musl.tar.gz | tar -xzf - -C /usr

RUN mkdir spack && \
    cd spack && \
    curl -Lfs https://github.com/spack/spack/archive/refs/heads/develop.tar.gz | tar -xzf - --strip-components=1 -C . && \
    curl -Lfs https://github.com/spack/spack/pull/34678.patch | git apply # not yet merged

ADD spack.yaml Makefile /root/

RUN --mount=type=cache,target=/buildcache \
    --mount=type=cache,target=/root/.spack/cache \
    spack compiler find && \
    spack mirror add cache file:///buildcache && \
    make -j$(nproc) push MY_BUILDCACHE=/buildcache

Makefile

SPACK ?= spack
export SPACK_COLOR = always
MAKEFLAGS += -Orecurse
SPACK_INSTALL_FLAGS += --no-check-signature
MY_BUILDCACHE := $(CURDIR)/cache

.PHONY: all clean

all: push

ifeq (,$(filter clean,$(MAKECMDGOALS)))
include env.mk
endif

push: $(addprefix example/push/,$(SPACK_PACKAGE_IDS))
	$(SPACK) -e . buildcache update-index --directory $(MY_BUILDCACHE)
	$(info Pushed everything, yay!)

example/push/%: example/install/%
	@mkdir -p $(dir $@)
	$(SPACK) -e . buildcache create --allow-root --only=package --unsigned --directory $(MY_BUILDCACHE) /$(HASH) 2> /dev/null # push $(SPEC)
	@touch $@

spack.lock: spack.yaml
	$(SPACK) -e . concretize -f

env.mk: spack.lock
	$(SPACK) -e . env depfile -o $@ --make-target-prefix example

clean:
	rm -rf spack.lock env.mk example/

spack.yaml

spack:
  view: false
  specs:
  - cmake