Fix Jupyter Nsight service proxies

brev/entrypoint-jupyter-user.bash

@@ -6,14 +6,20 @@ set -euo pipefail
 
 export HOME="${ACH_TARGET_HOME}"
 
+if [ -n "${ACH_PORT_FORWARDS:-}" ] && ! command -v socat &> /dev/null; then
+  echo "Error: ACH_PORT_FORWARDS is configured, but socat is not installed." >&2
+  echo "Install socat in the tutorial image to enable Jupyter service proxies." >&2
+  exit 1
+fi
+
 # Generate Jupyter plugin settings
 /accelerated-computing-hub/brev/jupyter-generate-plugin-settings.bash
 
 mkdir -p /accelerated-computing-hub/logs
 
 # Forward ports from other Docker Compose services to localhost so that
 # jupyter-server-proxy can reach them (it only proxies to localhost).
-if command -v socat &> /dev/null; then
+if [ -n "${ACH_PORT_FORWARDS:-}" ]; then
   for FORWARD in ${ACH_PORT_FORWARDS:-}; do
     LOCAL_PORT="${FORWARD%%:*}"
     REMOTE="${FORWARD#*:}"

tutorials/cuda-cpp/brev/dockerfile

@@ -22,6 +22,7 @@ RUN apt-get update -y \
     gnupg \
     gosu \
     libglib2.0-0 \
+    socat \
     sudo \
     ffmpeg \
  && apt-get clean -y \

tutorials/cuda-tile/brev/dockerfile

@@ -28,6 +28,7 @@ RUN apt-get update -y \
     lsb-release \
     gosu \
     libglib2.0-0 \
+    socat \
     sudo \
  && apt-get clean -y \
  && rm -rf /var/lib/apt/lists/*

tutorials/nvmath-python/brev/dockerfile

@@ -14,7 +14,7 @@ RUN set -ex \
      && rm -f /opt/requirements.txt \
  && `# Install system packages` \
      && apt-get update -y \
-     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends git-lfs gosu sudo \
+     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends git-lfs gosu socat sudo \
      && apt-get clean -y \
      && rm -rf /var/lib/apt/lists/*
 

tutorials/stdpar/brev/docker-recipe.py

@@ -76,7 +76,7 @@
   'curl', 'wget', 'zip', 'bc',
   'nginx', 'openssh-client',
   'libnuma1',  'numactl',
-  'gosu', 'sudo',
+  'gosu', 'socat', 'sudo',
 ])
 Stage0 += boost(version=boost_ver) # Required for AdaptiveCpp