chore: initial import from KNEL/PFVCluster@041d311 [#769]
Split per O&M lane work order. Full history: KNEL/PFVCluster. https://projects.knownelement.com/issues/769#note-4152
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#!/bin/bash
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# lm-sensors extend for snmpd: native sensors + TEMPer USB block [#341/#439]
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#
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# Deployed to /usr/local/bin/lmsensors-extend on sensor hosts by deploy.sh.
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# Output = lm-sensors format, consumed by Home Assistant's SNMP integration
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# (nsExtendOutputFull."lmsensors") and, if enabled later, LibreNMS's
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# lm-sensors app.
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#
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# Layers (each optional, at least one required):
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# 1. native /usr/bin/sensors output (CPU/board temps, fans) — lm-sensors pkg
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# 2. TEMPer USB probe (temperusb in venv /opt/temper-venv) — probe-optional
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# (venv-on-host is founder-approved for sensor hosts, incl. Proxmox)
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set -euo pipefail
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VENV_PY="${VENV_PY:-/opt/temper-venv/bin/python}"
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NATIVE_SENSORS_BIN="${NATIVE_SENSORS_BIN:-/usr/bin/sensors}"
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SYSFS_THERMAL_ROOT="${SYSFS_THERMAL_ROOT:-/sys/class/thermal}"
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CHIP_NAME="${CHIP_NAME:-temper-usb-1}"
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# Render lm-sensors format block from internal/external Celsius values.
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# Empty/absent external renders internal only. Non-numeric input is rejected.
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format_block() {
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local internal="${1:-}" external="${2:-}"
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local num_re='^-?[0-9]+(\.[0-9]+)?$'
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[[ "$internal" =~ $num_re ]] || {
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echo "error: internal temp not numeric: '$internal'" >&2
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return 1
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}
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local signed
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printf '%s\nAdapter: USB adapter\n' "$CHIP_NAME"
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signed="${internal#+}"; [[ "$signed" == -* ]] || signed="+$signed"
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printf 'Internal: %s°C\n' "$signed"
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if [[ -n "$external" && "$external" =~ $num_re ]]; then
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signed="${external#+}"; [[ "$signed" == -* ]] || signed="+$signed"
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printf 'External: %s°C\n' "$signed"
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fi
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}
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# True when a TEMPer USB dongle (0c45:7401) is attached and the venv exists.
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# Numeric mode: print ONE Celsius float for snmpd extend lmsensors_n [#618].
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# Preference: TEMPer external > TEMPer internal > first native/sysfs temp
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# reading. Consumed by HA's SNMP config-entry integration (device_class
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# temperature; HA renders C in the instance display unit).
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numeric_pick() {
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local internal="${1:-}" external="${2:-}" native="${3:-}" pick
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local num_re='^-?[0-9]+(\.[0-9]+)?$'
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for pick in "$external" "$internal"; do
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pick="${pick#+}"
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[[ "$pick" =~ $num_re ]] && { printf '%s\n' "$pick"; return 0; }
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done
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if [[ -n "$native" ]]; then
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pick="$(grep -oE "\-?[0-9]+(\.[0-9]+)?°C" <<<"$native" | head -1)"; pick="${pick%°C}"
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[[ "$pick" =~ $num_re ]] && { printf '%s\n' "$pick"; return 0; }
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fi
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return 1
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}
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numeric_main() {
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local internal external line
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if has_temper_probe; then
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if read -r internal external <<<"$(read_temper 2>/dev/null)"; then
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numeric_pick "${internal:-}" "${external:-}" "" && return 0
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fi
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fi
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line="$(run_native_sensors | grep -m1 '°C')"
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[[ -n "$line" ]] && numeric_pick "" "" "$line" && return 0
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line="$(read_sysfs_thermal 2>/dev/null | head -1 | awk '{printf "+%.1f°C", $2/1000}')"
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[[ -n "$line" ]] && numeric_pick "" "" "$line" && return 0
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echo "error: numeric mode found no sensor source" >&2
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return 1
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}
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has_temper_probe() {
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command -v lsusb >/dev/null 2>&1 || return 1
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[[ -x "$VENV_PY" ]] || return 1
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lsusb | grep -qi '0c45:7401'
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}
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# Read the TEMPer probe via temperusb; prints "<internal> <external>" in C.
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# Sensor 0 = internal, sensor 1 = external probe (if attached).
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read_temper() {
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"$VENV_PY" - <<'PY'
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from temperusb import TemperHandler
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internal = external = ""
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for device in TemperHandler().get_devices():
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try:
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temps = device.get_temperatures(sensors=[0, 1])
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except (ValueError, KeyError):
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temps = device.get_temperatures()
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for index, slot in ((0, "internal"), (1, "external")):
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reading = temps.get(index)
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if reading and reading.get("temperature_c") is not None:
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value = f"{reading['temperature_c']:.1f}"
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if slot == "internal":
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internal = value
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else:
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external = value
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print(f"{internal} {external}".strip())
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PY
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}
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run_native_sensors() {
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[[ -x "$NATIVE_SENSORS_BIN" ]] || return 1
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"$NATIVE_SENSORS_BIN" 2>/dev/null
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}
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# SBC fallback (Raspberry Pi et al.): lm-sensors often reports nothing; SoC
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# temperatures live in /sys/class/thermal/thermal_zone*/{type,temp} (mC).
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read_sysfs_thermal() {
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[[ -d "$SYSFS_THERMAL_ROOT" ]] || return 1
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local z type mc found=0
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for z in "$SYSFS_THERMAL_ROOT"/thermal_zone[0-9]*; do
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[[ -r "$z/type" && -r "$z/temp" ]] || continue
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type="$(<"$z/type")" mc="$(<"$z/temp")"
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[[ "$mc" =~ ^-?[0-9]+$ ]] || continue
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printf '%s %s\n' "$type" "$mc"
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found=1
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done
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((found)) || return 1
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}
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# Render lm-sensors format block from read_sysfs_thermal lines "type millicelsius".
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format_sysfs_block() {
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local input="${1:-}" type mc signed n=0
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[[ -n "$input" ]] || return 1
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printf 'soc-thermal-virtual-0\nAdapter: Virtual device\n'
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while read -r type mc; do
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((++n))
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signed="$(awk -v mc="$mc" 'BEGIN { printf "%.1f", mc / 1000 }')"
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signed="${signed#+}"
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[[ "$signed" == -* ]] || signed="+$signed"
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printf 'temp%d: %s°C\n' "$n" "$signed"
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done <<<"$input"
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}
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# Labeled per-zone temps (e.g. Jetson GPU-therm) [#736]. Hosts opt in by
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# listing zone types (one per line) in /etc/snmp/lmsensors-zone-types; no
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# snmpd.conf change or restart needed (extend re-execs per poll). Each type
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# renders its own chip block so HA templates can anchor on the chip name.
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ZONE_TYPES_FILE="${ZONE_TYPES_FILE:-/etc/snmp/lmsensors-zone-types}"
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format_labeled_zones() {
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local z type mc want signed
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[[ -r "$ZONE_TYPES_FILE" ]] || return 1
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while IFS= read -r want; do
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want="${want%%#*}"; want="${want//[[:space:]]/}"
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[[ -n "$want" ]] || continue
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for z in "$SYSFS_THERMAL_ROOT"/thermal_zone[0-9]*; do
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[[ -r "$z/type" && -r "$z/temp" ]] || continue
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[[ "$(<"$z/type")" == "$want" ]] || continue
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mc="$(<"$z/temp")"
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[[ "$mc" =~ ^-?[0-9]+$ ]] || continue
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signed="$(awk -v mc="$mc" 'BEGIN { printf "%.1f", mc / 1000 }')"
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signed="${signed#+}"
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[[ "$signed" == -* ]] || signed="+$signed"
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printf 'zone-%s-virtual-0\nAdapter: Virtual device\ntemp1: %s°C\n\n' "$want" "$signed"
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done
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done <"$ZONE_TYPES_FILE"
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return 0
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}
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main() {
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local out="" block internal external native="" sysinput
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if native="$(run_native_sensors)" && [[ -n "$native" ]]; then
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out+="$native"$'\n'
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else
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native=""
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fi
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if has_temper_probe; then
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if block="$(read_temper 2>/dev/null)" \
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&& read -r internal external <<<"$block" \
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&& block="$(format_block "${internal:-}" "${external:-}")"; then
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out+="$block"$'\n'
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else
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echo "warn: TEMPer probe present but read failed" >&2
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fi
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fi
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if [[ -z "$native" ]] \
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&& sysinput="$(read_sysfs_thermal 2>/dev/null)" \
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&& block="$(format_sysfs_block "$sysinput")"; then
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out+="$block"$'\n'
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fi
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if block="$(format_labeled_zones)" && [[ -n "$block" ]]; then
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out+="$block"$'\n'
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fi
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[[ -n "$out" ]] || {
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echo "error: no sensor sources available (lm-sensors pkg? TEMPer venv? sysfs thermal?)" >&2
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return 1
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}
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printf '%s' "$out"
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}
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if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
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if [[ "${1:-}" == "-n" ]]; then numeric_main; else main; fi
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fi
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