chore: commit pending repo changes

iso/overlay/usr/local/bin/bee-john-gpu-stress

@@ -23,6 +23,62 @@ contains_csv() {
     echo ",${haystack}," | grep -q ",${needle},"
 }
 
+show_opencl_diagnostics() {
+    if command -v clinfo >/dev/null 2>&1; then
+        echo "-- clinfo -l --" >&2
+        clinfo -l >&2 || true
+    fi
+    echo "-- john --list=opencl-devices --" >&2
+    ./john --list=opencl-devices >&2 || true
+}
+
+ensure_nvidia_uvm() {
+    if lsmod 2>/dev/null | grep -q '^nvidia_uvm '; then
+        return 0
+    fi
+    if [ "$(id -u)" != "0" ]; then
+        return 1
+    fi
+
+    ko="/usr/local/lib/nvidia/nvidia-uvm.ko"
+    [ -f "${ko}" ] || return 1
+
+    if ! insmod "${ko}" >/dev/null 2>&1; then
+        return 1
+    fi
+
+    uvm_major=$(grep -m1 ' nvidia-uvm$' /proc/devices | awk '{print $1}')
+    if [ -n "${uvm_major}" ]; then
+        mknod -m 666 /dev/nvidia-uvm c "${uvm_major}" 0 2>/dev/null || true
+        mknod -m 666 /dev/nvidia-uvm-tools c "${uvm_major}" 1 2>/dev/null || true
+    fi
+    return 0
+}
+
+ensure_opencl_ready() {
+    out=$(./john --list=opencl-devices 2>&1 || true)
+    if echo "${out}" | grep -q "Device #"; then
+        return 0
+    fi
+
+    if ensure_nvidia_uvm; then
+        out=$(./john --list=opencl-devices 2>&1 || true)
+        if echo "${out}" | grep -q "Device #"; then
+            return 0
+        fi
+    fi
+
+    echo "OpenCL devices are not available for John." >&2
+    if ! lsmod 2>/dev/null | grep -q '^nvidia_uvm '; then
+        echo "nvidia_uvm is not loaded." >&2
+    fi
+    if [ ! -e /dev/nvidia-uvm ]; then
+        echo "/dev/nvidia-uvm is missing." >&2
+    fi
+    show_opencl_diagnostics
+    return 1
+}
+
 while [ "$#" -gt 0 ]; do
     case "$1" in
         --seconds|-t) [ "$#" -ge 2 ] || usage; SECONDS="$2"; shift 2 ;;
@@ -76,6 +132,8 @@ echo "john_devices=${JOHN_DEVICES}"
 
 cd "${JOHN_DIR}"
 
+ensure_opencl_ready || exit 1
+
 choose_format() {
     if [ -n "${FORMAT}" ]; then
         echo "${FORMAT}"