testssl.sh/Dockerfile
Brennan Kinney 718eb3461c chore: Revise Dockerfile
- Removing bulk of the noise from inline documentation.
- Packages bundled into single line like previous the Alpine version had.
- `CACHE_ZYPPER` is only used as an `ARG` in the `builder` stage.
- `zypper clean` wasn't able to clear anything from the install root, other than the `CACHE_ZYPPER` mount.
2023-03-22 21:31:34 +13:00

53 lines
1.7 KiB
Docker

# syntax=docker.io/docker/dockerfile:1
ARG LEAP_VERSION=15.4
ARG INSTALL_ROOT=/rootfs
FROM opensuse/leap:${LEAP_VERSION} as builder
ARG CACHE_ZYPPER=/tmp/cache/zypper
ARG INSTALL_ROOT
# --mount is only necessary for persisting the zypper cache on the build host,
# Paired with --cache-dir below, RUN layer invalidation does not clear this cache.
# Not useful for CI, only local builds that retain the storage.
RUN --mount=type=cache,target="${CACHE_ZYPPER}",sharing=locked <<EOF
# Provides $VERSION_ID
source /etc/os-release
ZYPPER_OPTIONS=(
--releasever "${VERSION_ID}"
--installroot "${INSTALL_ROOT}"
--cache-dir "${CACHE_ZYPPER}"
)
# Sync package repos:
zypper ${ZYPPER_OPTIONS[@]} --gpg-auto-import-keys refresh
zypper ${ZYPPER_OPTIONS[@]} --non-interactive install \
--download-in-advance --no-recommends \
bash procps grep gawk sed coreutils busybox-util-linux busybox-vi ldns libidn2-0 socat openssl curl
## Cleanup (reclaim approx 13 MiB):
# None of this content should be relevant to the container:
rm -r "${INSTALL_ROOT}/usr/share/"{licenses,man,locale,doc,help,info}
# Functionality that the container doesn't need:
rm "${INSTALL_ROOT}/usr/share/misc/termcap"
rm -r "${INSTALL_ROOT}/usr/lib/sysimage/rpm"
EOF
# Create a new image with the contents of $INSTALL_ROOT
FROM scratch
ARG INSTALL_ROOT
COPY --link --from=builder ${INSTALL_ROOT} /
WORKDIR /home/testssl
RUN --mount=type=bind,from=busybox:latest,source=/bin,target=/bin <<EOF
/bin/adduser -D -s /bin/bash testssl
/bin/ln -s /home/testssl/testssl.sh /usr/local/bin/
EOF
# Copy over build context (after filtered by .dockerignore): bin/ etc/ testssl.sh
COPY --chown=testssl:testssl . /home/testssl/
USER testssl
ENTRYPOINT ["testssl.sh"]
CMD ["--help"]