ci/docker/alpine-linux-3.22-r.dockerfile

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# Minimal Alpine Linux container with R for testing Arrow R package
# on musl libc (CRAN runs checks on Alpine Linux 3.22)
# Replicates CRAN's Alpine environment as closely as possible

ARG arch=amd64
FROM ${arch}/alpine:3.22

# Install R and essential build tools
# Note: bash is needed for Arrow CI scripts, even though CRAN's Alpine uses BusyBox
RUN apk add \
        R \
        R-dev \
        R-doc \
        bash \
        checkbashisms \
        cmake \
        curl-dev \
        g++ \
        gcc \
        git \
        linux-headers \
        make \
        musl-locales \
        openssl-dev \
        pkgconfig \
        zlib-dev && \
    rm -rf /var/cache/apk/* && \
    ln -s /usr/share/zoneinfo/Etc/UTC /etc/localtime && \
    echo "Etc/UTC" > /etc/timezone

# Set locale and timezone
ENV LANG=C.UTF-8 \
    LC_COLLATE=C \
    MUSL_LOCPATH=/usr/share/i18n/locales/musl

# Set CRAN repo
RUN echo 'options(repos = c(CRAN = "https://cran.rstudio.com"))' >> /usr/lib/R/etc/Rprofile.site

# Install pak for package management (following rhub pattern)
RUN R -q -e 'install.packages("pak", repos = sprintf("https://r-lib.github.io/p/pak/%s/%s/%s/%s", "devel", .Platform$pkgType, R.Version()$os, R.Version()$arch))'

# Enable automatic system requirements installation
ENV PKG_SYSREQS=true \
    R_PKG_SYSREQS2=true

# Set up parallel compilation
RUN echo "MAKEFLAGS=-j$(R -s -e 'cat(parallel::detectCores())')" >> /usr/lib/R/etc/Renviron.site

# Configure image and install Arrow-specific tooling
COPY ci/scripts/r_docker_configure.sh /arrow/ci/scripts/
COPY ci/etc/rprofile /arrow/ci/etc/
COPY ci/scripts/r_install_system_dependencies.sh /arrow/ci/scripts/
COPY ci/scripts/install_minio.sh /arrow/ci/scripts/
COPY ci/scripts/install_gcs_testbench.sh /arrow/ci/scripts/
RUN /arrow/ci/scripts/r_docker_configure.sh

# Install sccache
COPY ci/scripts/install_sccache.sh /arrow/ci/scripts/
RUN /arrow/ci/scripts/install_sccache.sh unknown-linux-musl /usr/local/bin

# Install R package dependencies
COPY ci/scripts/r_deps.sh /arrow/ci/scripts/
COPY r/DESCRIPTION /arrow/r/
RUN /arrow/ci/scripts/r_deps.sh /arrow

# Verify R works and this is musl
RUN R --version && ldd --version 2>&1 | grep -q musl