feat: publish flex docker image (#5)

* feat: publish flex docker image

* flex-build-push.yml: rename docker image

* Add healthcheck to Dockerfile.flex

* Optionally read options from environment

* postmaster/flex/Main: Fix reading from environment

* postmaster/flex/Main: Fix reading from environment

* postmaster/flex/Main: Allow selection of destination port

* .github/workflows/flex-build-push: remove merge group and multi platform support

Author: richardapeters

.github/workflows/flex-build-push.yml

@@ -0,0 +1,58 @@
+---
+name: Build & Push Flex Docker Container
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*.*.*"]
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-push-flex:
+    runs-on: [ubuntu-latest]
+    permissions:
+      contents: write
+      packages: write
+      pull-requests: write
+    steps:
+      - uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
+        id: metadata
+        env:
+          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}-flex
+          # Generate Docker tags based on the following events/attributes
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=pr
+            type=semver,pattern={{raw}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+      - uses: docker/setup-buildx-action@988b5a0280414f521da01fcc63a27aeeb4b104db # v3.6.1
+      - uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        with:
+          persist-credentials: false
+          submodules: true
+      - uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85 # v6.7.0
+        with:
+          file: Dockerfile.flex
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+          annotations: ${{ steps.metadata.outputs.annotations }}
+          sbom: true
+          provenance: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile.flex

@@ -10,11 +10,21 @@ COPY . /workspace
 RUN cmake --preset flex \
  && cmake --build --preset flex
 
+RUN apt-get update && apt-get install -y --no-install-recommends net-tools
+
 FROM scratch
 
+HEALTHCHECK --interval=5s --retries=100 CMD netstat -ltn | grep -c ":1234"; if [ 0 != $? ]; then exit 1; fi;
+
 WORKDIR /flex
 COPY --from=builder /workspace/build/flex/postmaster/flex/postmaster.flex /flex/
 COPY --from=builder /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6
+COPY --from=builder /bin/sh /bin/sh
+COPY --from=builder /usr/bin/netstat /usr/bin/netstat
+COPY --from=builder /usr/bin/grep /usr/bin/grep
+COPY --from=builder /lib/x86_64-linux-gnu/libselinux.so.1 /lib/x86_64-linux-gnu/libselinux.so.1
+COPY --from=builder /lib/x86_64-linux-gnu/libpcre2-8.so.0 /lib/x86_64-linux-gnu/libpcre2-8.so.0
+COPY --from=builder /lib64/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2
 
 ENTRYPOINT ["/flex/postmaster.flex"]
 CMD ["--help"]

postmaster/flex/Main.cpp

@@ -11,6 +11,16 @@
 #include "services/network_instantiations/NetworkAdapter.hpp"
 #include "services/tracer/GlobalTracer.hpp"
 #include "services/tracer/TracerOnIoOutputInfrastructure.hpp"
+#include <cstdlib>
+
+std::string Env(const char* name)
+{
+    auto result = std::getenv(name);
+    if (result != nullptr)
+        return result;
+    else
+        return "";
+}
 
 int main(int argc, const char* argv[], const char* env[])
 {
@@ -24,25 +34,35 @@ int main(int argc, const char* argv[], const char* env[])
 
     try
     {
-        parser.ParseCLI(argc, argv);
+        std::string firmwareArg = Env("POSTMASTER_FIRMWARE");
+        std::string urlArg = Env("POSTMASTER_IP");
+        std::string passwordArg = Env("POSTMASTER_PASSWORD");
+
+        if (firmwareArg.empty() && urlArg.empty())
+        {
+            parser.ParseCLI(argc, argv);
+            firmwareArg = args::get(firmwareArgument);
+            urlArg = args::get(urlArgument);
+            passwordArg = args::get(passwordArgument);
+        }
 
         static hal::TimerServiceGeneric timerService;
         static hal::SynchronousRandomDataGeneratorGeneric randomDataGenerator;
         static main_::TracerOnIoOutputInfrastructure tracer;
         static main_::NetworkAdapter network;
         static hal::FileSystemGeneric fileSystem;
 
-        static auto firmware = firmwareArgument ? fileSystem.ReadBinaryFile(args::get(firmwareArgument)) : std::vector<uint8_t>{};
+        static auto firmware = !firmwareArg.empty() ? fileSystem.ReadBinaryFile(firmwareArg) : std::vector<uint8_t>{};
 
         static services::HttpClientConnectorWithNameResolverImpl<> connector(network.ConnectionFactoryWithNameResolver());
-        static infra::BoundedString::WithStorage<512> httpUrl{ args::get(urlArgument) };
-        static infra::BoundedString::WithStorage<512> webSocketUrl{ args::get(urlArgument) };
-        static application::EchoWebSocketClientFactory webSocketFactory(webSocketUrl, 80, network.ConnectionFactory(), tracer.tracer);
+        static infra::BoundedString::WithStorage<512> httpUrl{ urlArg };
+        static infra::BoundedString::WithStorage<512> webSocketUrl{ urlArg };
+        static application::EchoWebSocketClientFactory webSocketFactory(webSocketUrl, services::PortFromUrl(webSocketUrl).ValueOr(80), network.ConnectionFactory(), tracer.tracer);
         static services::HttpClientWebSocketInitiation webSocketInitiation(webSocketFactory, connector,
             webSocketFactory, randomDataGenerator, services::noAutoConnect);
-        static application::HttpClientAuthenticationDigest::WithMaxHeaders<10> clientAuthentication{ args::get(passwordArgument), randomDataGenerator };
+        static application::HttpClientAuthenticationDigest::WithMaxHeaders<10> clientAuthentication{ passwordArg, randomDataGenerator };
         static services::HttpClientAuthenticationConnector clientAuthenticationConnector{ connector, clientAuthentication };
-        static application::FlexHttpClient httpClient(httpUrl, 80, clientAuthenticationConnector, firmware, webSocketInitiation, tracer.tracer);
+        static application::FlexHttpClient httpClient(httpUrl, services::PortFromUrl(httpUrl).ValueOr(80), clientAuthenticationConnector, firmware, webSocketInitiation, tracer.tracer);
 
         network.ExecuteUntil([&]()
             {