feat(idrac): drac-extend — IPMI temps via snmpd extend (tsys6/7) [#625]

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dcinfra/idrac/drac-extend.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+# drac-extend: expose iDRAC IPMI temperature SDRs via snmpd extend [#625]
+#
+# Deployed to /usr/local/bin/drac-extend on pfv-tsys6 / pfv-tsys7.
+# Creds live in /etc/snmp/drac-env (0600 root): DRAC_HOST, IPMI_USER, IPMI_PASS.
+# Output: "<label> <celsius>" per enabled sensor, e.g. "inlet_temp 22".
+# Consumed by Home Assistant SNMP sensors via value_template regex.
+#
+# Why extend and not the DRAC's own SNMP agent: iDRAC6/7 hardware MIB tables
+# are unpopulated on this firmware generation (verified 2026-09-02), while
+# IPMI SDR works. [#625]
+set -euo pipefail
+
+ENV_FILE="${DRAC_ENV:-/etc/snmp/drac-env}"
+if [ ! -r "$ENV_FILE" ]; then
+    echo "drac-extend: missing $ENV_FILE" >&2
+    exit 1
+fi
+# shellcheck disable=SC1090  # env file is host-local by design (creds)
+. "$ENV_FILE"
+: "${DRAC_HOST:?DRAC_HOST unset}" "${IPMI_USER:?IPMI_USER unset}" "${IPMI_PASS:?IPMI_PASS unset}"
+export IPMI_PASSWORD="${IPMI_PASS}"
+
+ipmitool -I lanplus -E -H "$DRAC_HOST" -U "$IPMI_USER" \
+    sdr type temperature 2>/dev/null |
+    awk -F'|' '
+        $3 ~ /ok/ && $5 ~ /degrees C/ {
+            label = tolower($1)
+            gsub(/[^a-z0-9]+/, "_", label)
+            gsub(/^_+|_+$/, "", label)
+            value = $5
+            gsub(/[^0-9]/, "", value)
+            print label, value
+        }'