FROM nginx:%%NGINX_VERSION%%-alpine

RUN set -x \
    && apkArch="$(cat /etc/apk/arch)" \
    && nginxPackages="%%PACKAGES%%
    " \
# install prerequisites for public key and pkg-oss checks
    && apk add --no-cache --virtual .checksum-deps \
        openssl \
    && case "$apkArch" in \
        x86_64|aarch64) \
# arches officially built by upstream
            apk add -X "%%PACKAGEREPO%%v$(egrep -o '^[0-9]+\.[0-9]+' /etc/alpine-release)/main" --no-cache $nginxPackages \
            ;; \
        *) \
# we're on an architecture upstream doesn't officially build for
# let's build binaries from the published packaging sources
            set -x \
            && tempDir="$(mktemp -d)" \
            && chown nobody:nobody $tempDir \
            && apk add --no-cache --virtual .build-deps \
                gcc \
                libc-dev \
                make \
                openssl-dev \
                pcre2-dev \
                zlib-dev \
                linux-headers \
                perl-dev \
                bash \
                alpine-sdk \
                findutils \
            && su nobody -s /bin/sh -c " \
                export HOME=${tempDir} \
                && cd ${tempDir} \
                && curl -f -O https://hg.nginx.org/pkg-oss/archive/%%REVISION%%.tar.gz \
                && PKGOSSCHECKSUM=\"%%PKGOSSCHECKSUM%% *%%REVISION%%.tar.gz\" \
                && if [ \"\$(openssl sha512 -r %%REVISION%%.tar.gz)\" = \"\$PKGOSSCHECKSUM\" ]; then \
                    echo \"pkg-oss tarball checksum verification succeeded!\"; \
                else \
                    echo \"pkg-oss tarball checksum verification failed!\"; \
                    exit 1; \
                fi \
                && tar xzvf %%REVISION%%.tar.gz \
                && cd pkg-oss-%%REVISION%% \
                && cd alpine \
                && make %%BUILDTARGET%% \
                && apk index -o ${tempDir}/packages/alpine/${apkArch}/APKINDEX.tar.gz ${tempDir}/packages/alpine/${apkArch}/*.apk \
                && abuild-sign -k ${tempDir}/.abuild/abuild-key.rsa ${tempDir}/packages/alpine/${apkArch}/APKINDEX.tar.gz \
                " \
            && cp ${tempDir}/.abuild/abuild-key.rsa.pub /etc/apk/keys/ \
            && apk del --no-network .build-deps \
            && apk add -X ${tempDir}/packages/alpine/ --no-cache $nginxPackages \
            ;; \
    esac \
# remove checksum deps
    && apk del --no-network .checksum-deps \
# if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
    && if [ -n "$tempDir" ]; then rm -rf "$tempDir"; fi \
    && if [ -f "/etc/apk/keys/abuild-key.rsa.pub" ]; then rm -f /etc/apk/keys/abuild-key.rsa.pub; fi