Reproducer for https://github.com/spack/spack/issues/13413

Dockerfile.spack.llvm

FROM ubuntu:18.04
LABEL name="spack-linux-ubuntu18.04-x86_64"

####################################################
#                   Spack Setup                    #
####################################################
ARG SPACK_GIT_URL=https://github.com/spack/spack.git
ARG SPACK_GIT_BRANCH=develop
ARG SPACK_GIT_HASH=af65146ef69fcde10d53b2ee12f82a9c28361e23
####################################################

ENV LANG C.UTF-8

RUN DEBIAN_FRONTEND=noninteractive \
    apt-get clean &&\
    apt-get update &&\
    apt-get autoclean -y &&\
    apt-get autoremove -y &&\
    apt-get update &&\
# Install utilities
    apt-get install -f -y apt-utils &&\
# Install spack requirements
    apt-get install -f -y build-essential \
                          gfortran \
                          python \
                          git \
                          subversion \
                          curl \
                          wget \
                          unzip &&\
# Clean up all temporary files
    apt-get clean &&\
    apt-get autoclean -y &&\
    apt-get autoremove -y &&\
    apt-get clean &&\
    rm -rf /tmp/* /var/tmp/* &&\
    rm -rf /var/lib/apt/lists/* &&\
    rm -f /etc/ssh/ssh_host_*

####################################################

ENV SPACK_ARCHIVE "${SPACK_GIT_HASH:-${SPACK_GIT_BRANCH}}"

RUN wget -P / "https://github.com/spack/spack/archive/${SPACK_ARCHIVE}.zip" &&\
    unzip -q -d / "/${SPACK_ARCHIVE}.zip" &&\
    mv "/spack-${SPACK_ARCHIVE}" /spack &&\
    rm -f /${SPACK_ARCHIVE}.zip &&\
    echo "${SPACK_ARCHIVE}" > /SPACKVERSION &&\
    useradd -ms /bin/bash spacker &&\
    chown -R spacker /spack
USER spacker

# LLVM

RUN /spack/bin/spack bootstrap &&\
    /spack/bin/spack install llvm &&\
    /spack/bin/spack clean --all