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python: ship nsjail so shimmy's --sandbox works #2

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Merged
m-messer merged 1 commit into from
Aug 31, 2026
+26 −1
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python: ship nsjail so shimmy's --sandbox works #2

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27 changes: 26 additions & 1 deletion python/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,21 @@ RUN apt-get update && apt-get install -y \
curl \
&& rm -rf /var/lib/apt/lists/*

# Build nsjail from source, on the same Debian release as the runtime image so
# the glibc / libstdc++ / libprotobuf ABIs match. shimmy ships the --sandbox
# feature but not the nsjail binary, so without this SANDBOX_ENABLED=true makes
# shimmy fail at startup (missing /usr/sbin/nsjail). Mirrors shimmy's own
# nsjail-builder stage. Dormant unless a function opts into --sandbox.
FROM python:${PYTHON_VERSION}-slim-${DEBIAN_VERSION} AS nsjail-builder
RUN apt-get update && apt-get install -y --no-install-recommends \
autoconf bison flex g++ gcc git libtool make pkg-config \
libcap-dev libnl-route-3-dev libprotobuf-dev protobuf-compiler \
&& rm -rf /var/lib/apt/lists/*
ARG NSJAIL_VERSION=3.4
RUN git clone --branch "${NSJAIL_VERSION}" --recurse-submodules --depth=1 \
https://github.com/google/nsjail.git /nsjail-src \
&& make -C /nsjail-src -j"$(nproc)"

FROM base AS lambda-rie

# Install the AWS Lambda Runtime Interface Emulator
Expand All @@ -27,22 +42,32 @@ RUN case $(uname -m) in \

FROM base

# Install git so we can install python packages from git repositories
# git: install python packages from git repositories.
# libcap2 / libnl-route-3-200 / libprotobuf32: nsjail's runtime shared libraries.
RUN apt-get update && apt-get install -y \
git \
libcap2 \
libnl-route-3-200 \
libprotobuf32 \
&& rm -rf /var/lib/apt/lists/*

ENV LOG_FORMAT="production"

# add shimmy
COPY --from=shimmy /shimmy /usr/local/bin/shimmy

# add nsjail (used by shimmy's --sandbox / SANDBOX_ENABLED)
COPY --from=nsjail-builder /nsjail-src/nsjail /usr/sbin/nsjail

# add aws-lambda-rie
COPY --from=lambda-rie /usr/local/bin/aws-lambda-rie /usr/local/bin/aws-lambda-rie

# Copy the entrypoint script
COPY ./entrypoint.sh /entrypoint.sh

# fail the build if nsjail is missing a shared library
RUN ! ldd /usr/sbin/nsjail | grep -q 'not found'

ENTRYPOINT [ "/entrypoint.sh" ]

CMD [ "shimmy" ]
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