substrate/Dockerfile at main · haukened/substrate · GitHub

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# syntax=docker/dockerfile:1

################################################
# Stage 0: define build args
################################################

ARG USER_UID=65534
ARG USER_GID=65534
ARG USER_NAME=nobody
ARG BUILD_DATE="unknown"
ARG VERSION="dev"

###############################################
# Stage 1: build CA bundle from CCADB + user roots
###############################################
FROM alpine:3.20 AS builder

ARG USER_UID USER_GID USER_NAME

# Build arg to control the CCADB export URL without changing the Dockerfile
ARG CCADB_URL="https://ccadb.my.salesforce-sites.com/mozilla/IncludedRootsPEMTxt?TrustBitsInclude=Websites"

# Minimal tools needed by scripts
RUN apk add --no-cache curl openssl coreutils busybox

WORKDIR /work

# Copy scripts and optional user roots from repo
COPY roots.sh ./roots.sh
COPY user-roots/ ./user-roots/

# Output locations
ENV OUT_PEM=/work/out/ca-bundle.pem \
    HASHED_DIR=/work/out/certs

# Run the consolidating script to produce the bundle
RUN mkdir -p /work/out \
 && set -eux; \
    sh ./roots.sh \
      --url "$CCADB_URL" \
      --out "$OUT_PEM" \
      --hashed-dir "$HASHED_DIR"; \
    test -s "$OUT_PEM"; \
    ls -l "$OUT_PEM"

# Prepare minimal passwd/group for the final image (cannot RUN in scratch)
# UID, GID, and USERNAME configurable via build args USER_UID, USER_GID, USER_NAME
RUN mkdir -p /work/system && \
    echo "${USER_NAME}:x:${USER_UID}:${USER_GID}:${USER_NAME}:/:/bin/false" > /work/system/passwd && \
    echo "${USER_NAME}:x:${USER_GID}:" > /work/system/group && \
    mkdir -p /work/system/bin && \
    echo '#!/bin/sh' > /work/system/bin/false && \
    echo 'exit 1' >> /work/system/bin/false && \
    chmod +x /work/system/bin/false

# Create /etc/os-release file for compatibility with security tools
RUN mkdir -p /work/os && \
    printf 'NAME="substrate"\nID=substrate\nVERSION_ID="%s"\nPRETTY_NAME="Substrate Static Base"\n' "$VERSION" > /work/os/os-release

###############################################
# Stage 2: final minimal image
###############################################
FROM scratch

ARG BUILD_DATE VERSION

# OCI labels for provenance
LABEL org.opencontainers.image.source="https://github.com/haukened/substrate" \
      org.opencontainers.image.authors="https://github.com/haukened" \
      org.opencontainers.image.title="substrate" \
      org.opencontainers.image.description="Minimal base with Mozilla CCADB website roots and non-root user." \
      org.opencontainers.image.licenses="MIT" \
      org.opencontainers.image.created=$BUILD_DATE \
      org.opencontainers.image.version=$VERSION

# Trust store
COPY --from=builder /work/out/ca-bundle.pem /etc/ssl/certs/ca-certificates.crt
# If you prefer the hashed directory, copy this instead:
# COPY --from=builder /work/out/certs/ /etc/ssl/certs/

# Minimal identity files for UID/GID mapping
COPY --from=builder /work/system/passwd /etc/passwd
COPY --from=builder /work/system/group  /etc/group
COPY --from=builder /work/system/bin/false /bin/false
COPY --from=builder /work/os/os-release /etc/os-release

# UID and GID configurable via build args USER_UID and USER_GID
# Defaults defined once at the top; stages re-declare to use them
ARG USER_UID USER_GID
USER ${USER_UID}:${USER_GID}

# Provide a neutral default CMD; downstream images should override
# sharing the same command as the POSIX non-executable /bin/false reduces stuff in the image.
CMD ["/bin/false"]