refactor: switch PTP daemon to linuxptp/ptp4l; remove statime

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>

Dockerfile

@@ -20,7 +20,7 @@ RUN rm -rf src
 
 # Copy full source and build project
 COPY . .
-RUN cargo build --release && cargo install --locked statime
+RUN cargo build --release
 
 # (Statime installation removed; container runs only haci)
 
@@ -32,12 +32,13 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     tzdata \
     socat \
+    linuxptp \
  && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
 COPY --from=builder /app/target/release/get-haci /usr/local/bin/get-haci
-COPY --from=builder /usr/local/cargo/bin/statime /usr/local/bin/statime
+# Using linuxptp (ptp4l) provided by apt; no statime binary copied
 COPY static ./static
 COPY scripts/entrypoint.sh /usr/local/bin/entrypoint.sh
 COPY scripts/ltc_gen.sh /usr/local/bin/ltc-gen.sh

scripts/entrypoint.sh

@@ -28,17 +28,20 @@ if [ "${MOCK_TEENSY:-0}" = "1" ]; then
   fi
 fi
 
-# Optionally start the PTP daemon (statime) for development
+# Optionally start a PTP daemon for development (prefer statime, fallback to ptp4l)
 if [ "${RUN_STATIME:-0}" = "1" ]; then
-  echo "[entrypoint] Starting statime PTP daemon..." >&2
+  IFACE="${PTP_INTERFACE:-eth0}"
   if command -v statime >/dev/null 2>&1; then
-    IFACE="${PTP_INTERFACE:-eth0}"
-    echo "[entrypoint] statime interface: ${IFACE}" >&2
-    # Run statime in background; logs to container stderr/stdout
+    echo "[entrypoint] Starting statime on ${IFACE}..." >&2
     statime -i "${IFACE}" &
     STATIME_PID=$!
+  elif command -v ptp4l >/dev/null 2>&1; then
+    echo "[entrypoint] Starting ptp4l on ${IFACE}..." >&2
+    # -m prints messages to stdout; adjust args as needed for your environment
+    ptp4l -i "${IFACE}" -m &
+    PTP4L_PID=$!
   else
-    echo "[entrypoint] statime not found on PATH" >&2
+    echo "[entrypoint] No PTP daemon found (statime or ptp4l). Skipping." >&2
   fi
 fi