docker: select reduced circuits via env

Author: Zk2u

docker/Dockerfile

@@ -32,9 +32,12 @@ COPY .cargo .cargo
 COPY bin bin
 COPY crates crates
 
-# Build the release binary
-RUN cargo build --release --features=reduced-circuits --bin mosaic \
-    && strip --strip-debug target/release/mosaic
+# Build both release binaries so runtime can switch via env var.
+RUN cargo build --release --bin mosaic \
+    && cp target/release/mosaic target/release/mosaic-default \
+    && cargo build --release --features=reduced-circuits --bin mosaic \
+    && mv target/release/mosaic target/release/mosaic-reduced \
+    && strip --strip-debug target/release/mosaic-default target/release/mosaic-reduced
 
 # ------------------------------------------------------------------------------
 # Stage 2: Minimal runtime image
@@ -62,7 +65,8 @@ RUN FDB_ARCH=$([ "$TARGETARCH" = "arm64" ] && echo "aarch64" || echo "amd64") \
 #   FDB cluster file                   – path configured via storage.cluster_file in config.toml
 RUN mkdir -p /etc/mosaic && chown ubuntu:ubuntu /etc/mosaic
 
-COPY --from=builder /build/target/release/mosaic /usr/local/bin/mosaic
+COPY --from=builder /build/target/release/mosaic-default /usr/local/bin/mosaic
+COPY --from=builder /build/target/release/mosaic-reduced /usr/local/bin/mosaic-reduced
 COPY docker/entrypoint.sh /usr/local/bin/entrypoint.sh
 RUN chmod +x /usr/local/bin/entrypoint.sh
 

docker/entrypoint.sh

@@ -8,6 +8,8 @@
 # The config file's [circuit] section should reference:
 #   path = "/etc/mosaic/circuit.v5c"
 #
+# Set MOSAIC_REDUCED_CIRCUITS=1 to run the reduced-circuits build.
+#
 # Any extra arguments are forwarded to the mosaic binary.
 
 set -euo pipefail
@@ -20,4 +22,12 @@ if [ ! -f "$CONFIG_PATH" ]; then
     exit 1
 fi
 
-exec /usr/local/bin/mosaic "$CONFIG_PATH" "$@"
+MOSAIC_BIN="/usr/local/bin/mosaic"
+
+case "${MOSAIC_REDUCED_CIRCUITS:-}" in
+    1|true|TRUE|yes|YES|on|ON)
+        MOSAIC_BIN="/usr/local/bin/mosaic-reduced"
+        ;;
+esac
+
+exec "$MOSAIC_BIN" "$CONFIG_PATH" "$@"