Add element for hardware discovery ramdisk for ironic-discoverd

ironic-discoverd [1] is a StackForge project for conducting hardware properties
discovery via booting a special discovery ramdisk and interrogating hardware
from within it. It aims to be one of the official means of hardware properties
discovery for Ironic in Kilo release [2].

The ramdisk collects hardware information from the machine
it's booted on and posts it to the URL provided via
kernel argument 'discoverd_callback_url'.

[1] https://pypi.python.org/pypi/ironic-discoverd
[2] https://review.openstack.org/#/c/135605/

Co-Authored-By: Lucas Alvares Gomes <lucasagomes@gmail.com>
Change-Id: Ic81fe8b3bd0884971bb522b48658c7ee538a31f2

elements/ironic-discoverd-ramdisk/README.md

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+ironic-discoverd [1] is a StackForge project for conducting hardware properties
+discovery via booting a special discovery ramdisk and interrogating hardware
+from within it.
+
+This ramdisk collects hardware information from the machine
+it's booted on and posts it to the URL provided via
+kernel argument 'discoverd_callback_url'.
+
+The hardware information collected by the ramdisk are:
+
+* BMC IP address (may be required for associating with existing node in Ironic)
+* CPU count and architecture
+* Memory amount in MiB
+* Hard drive size in GiB
+* IP and mac addresses for all NICs except the loopback
+
+The machine is halted at the end of the process.
+
+[1] https://pypi.python.org/pypi/ironic-discoverd

elements/ironic-discoverd-ramdisk/binary-deps.d/discovery-ironic

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+curl
+dmidecode
+fdisk
+ipmitool
+lscpu
+wc

elements/ironic-discoverd-ramdisk/init.d/80-discovery-ironic

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+readonly DISCOVERD_URL=$(get_kernel_parameter discoverd_callback_url)
+
+function request_curl(){
+    HTTP_METHOD=$1
+    URL=$2
+    DATA=$3
+
+    if [ ! -z "$DATA" ]; then
+        DATA="\"-d \"$DATA\"\""
+    fi
+
+    RESULT=$(eval curl -i -X "$HTTP_METHOD" \
+           "-H 'Accept: application/json'" \
+           "-H 'Content-Type: application/json'" \
+           "$DATA" \
+           "$URL") || troubleshoot
+    # CURL can't return error code on 4xx error
+    if echo $RESULT | grep "HTTP/1.0 4"; then
+        echo "Ironic API returned error: $RESULT"
+        troubleshoot
+    fi
+    echo $RESULT
+}
+
+IFACES=
+for iface in $(ls /sys/class/net/ | grep -v lo)
+do
+    MAC=$(ip link show $iface | awk '/ether/ {print $2}')
+    IP=$(ip addr show $iface | awk '/inet / { sub(/\/.*/, "", $2); print $2 }')
+    if [ ! -z "$MAC" ]; then
+        IFACES="$IFACES,\"$iface\":{\"mac\":\"$MAC\",\"ip\":\"$IP\"}"
+    fi
+done
+IFACES="{$(echo $IFACES | sed s/,//)}"
+
+# NOTE(dtantsur): workaround for IPMI device not present on some systems
+modprobe ipmi_msghandler || echo "WARNING: modprobe failed, ipmitool call may fail"
+modprobe ipmi_devintf || echo "WARNING: modprobe failed, ipmitool call may fail"
+modprobe ipmi_si || echo "WARNING: modprobe failed, ipmitool call may fail"
+
+BMC_ADDRESS=$(ipmitool lan print | grep -e "IP Address [^S]" | awk '{ print $4 }')
+
+CPU_ARCH=$(lscpu | grep Architecture | awk '{ print $2 }')
+# NOTE(lucasagomes): dmidecode because we want to know the total
+# memory in the system, even the reserved part to the BIOS
+RAM=$(dmidecode -t 16 | grep 'Maximum Capacity' | awk '{if ($4 == "GB") s+=$3*1024; else s+=$3;} END {print s}')
+CPUS=$(cat /proc/cpuinfo | grep processor | wc -l)
+disk_bytes=$(fdisk -l | grep Disk | awk '{print $5}' | head -n 1)
+# NOTE(dtantsur): -1 is required to give Ironic some spacing for partitioning and may be removed later
+DISK_SIZE=$(($disk_bytes/1024/1024/1024 - 1))
+
+NODE_DATA="'{\"ipmi_address\":\"$BMC_ADDRESS\",\"local_gb\":$DISK_SIZE,\"memory_mb\":$RAM,\"cpus\":$CPUS,\"cpu_arch\":\"$CPU_ARCH\""
+NODE_DATA="$NODE_DATA,\"interfaces\":$IFACES}'"
+echo Collected $NODE_DATA
+NODE_RESP=$(request_curl POST $DISCOVERD_URL $NODE_DATA)
+
+echo "Node is now discovered! Halting..."
+# Give user a chance of seeing the output
+sleep 5
+poweroff -f

elements/ironic-discoverd-ramdisk/install.d/51-discovery-ironic-install-util-linux

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages util-linux

elements/ironic-discoverd-ramdisk/install.d/53-discovery-ironic-install-curl

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages curl

elements/ironic-discoverd-ramdisk/install.d/54-discovery-ironic-install-dmidecode

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages dmidecode

elements/ironic-discoverd-ramdisk/install.d/55-discovery-ironic-install-ipmitool

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+#!/bin/bash
+
+set -eu
+set -o pipefail
+
+install-packages ipmitool