Merge pull request #234 from microsoft/danmihai1/genpolicy-docker-build

genpolicy: update Dockerfile

src/tools/genpolicy/Dockerfile

@@ -1,13 +1,43 @@
-FROM mcr.microsoft.com/cbl-mariner/base/core:2.0
-RUN tdnf install -y git build-essential protobuf-compiler protobuf-devel expect curl dnf openssl-devel clang-devel
-RUN tdnf install -y libseccomp-devel parted qemu-img golang btrfs-progs-devel device-mapper-devel cmake
-RUN tdnf install -y ca-certificates
-RUN tdnf install -y rust
-
-RUN git clone --branch cc-msft-prototypes https://github.com/microsoft/kata-containers.git
-WORKDIR kata-containers/src/tools/genpolicy
-RUN cargo build
-
-RUN RUST_LOG=info target/debug/genpolicy -u < ../../agent/samples/policy/yaml/kubernetes/conformance/netexecrc.yaml > tmp.yaml
-RUN mv tmp.yaml ../../agent/samples/policy/yaml/kubernetes/conformance/netexecrc.yaml
-RUN git status
+# Copyright (c) 2024 Microsoft Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Example:
+#
+# git clone https://github.com/microsoft/kata-containers.git
+# cd kata-containers/src/tools/genpolicy
+#
+# mkdir -p /tmp/genpolicy
+# sudo DOCKER_BUILDKIT=1 docker build --no-cache --output /tmp/genpolicy --build-arg GENPOLICY_BRANCH="msft-main" .
+#
+# RUST_LOG=info /tmp/genpolicy/genpolicy -p /tmp/genpolicy/rules.rego -j /tmp/genpolicy/genpolicy-settings.json -y ../../agent/samples/policy/yaml/pod/pod-one-container.yaml
+
+FROM mcr.microsoft.com/cbl-mariner/base/core:2.0 AS genpolicy-build-stage
+
+RUN tdnf install -y \
+    build-essential \
+    ca-certificates \
+    cmake \
+    git \
+    openssl-static \
+    protobuf-compiler \
+    rust 
+
+# Get genpolicy source code.
+WORKDIR /src
+ARG GENPOLICY_BRANCH="msft-main"
+RUN git clone https://github.com/microsoft/kata-containers.git -b "${GENPOLICY_BRANCH}"
+
+# Build from source code.
+WORKDIR /src/kata-containers/src/tools/genpolicy
+RUN OPENSSL_STATIC=1 \
+    OPENSSL_LIB_DIR=/usr/lib \
+    OPENSSL_INCLUDE_DIR=/usr/include/openssl \
+    LIBC=gnu \
+    make build
+
+# Copy the files needed for executing genpolicy into the --output directory of "DOCKER_BUILDKIT=1 docker build".
+FROM scratch
+COPY --from=genpolicy-build-stage /src/kata-containers/src/tools/genpolicy/target/x86_64-unknown-linux-gnu/release/genpolicy .
+COPY --from=genpolicy-build-stage /src/kata-containers/src/tools/genpolicy/genpolicy-settings.json .
+COPY --from=genpolicy-build-stage /src/kata-containers/src/tools/genpolicy/rules.rego .