start_firecracker.sh

#!/bin/bash -e
SB_ID="${1:-0}" # Default to sb_id=0

RO_DRIVE="$PWD/rootfs.ext4"

KERNEL="$PWD/vmlinux"
TAP_DEV="fc-${SB_ID}-tap0"

#KERNEL_BOOT_ARGS="panic=1 pci=off reboot=k tsc=reliable quiet 8250.nr_uarts=0 ipv6.disable=1"
KERNEL_BOOT_ARGS="console=ttyS0 reboot=k panic=1 pci=off nomodules ipv6.disable=1"

API_SOCKET="/tmp/firecracker-sb${SB_ID}.sock"
CURL=(curl --silent --show-error --header Content-Type:application/json --unix-socket "${API_SOCKET}" --write-out "HTTP %{http_code}")

curl_put() {
    local URL_PATH="$1"
    local OUTPUT RC
    OUTPUT="$("${CURL[@]}" -X PUT --data @- "http://localhost/${URL_PATH#/}" 2>&1)"
    RC="$?"
    if [ "$RC" -ne 0 ]; then
        echo "Error: curl PUT ${URL_PATH} failed with exit code $RC, output:"
        echo "$OUTPUT"
        return 1
    fi
    # Error if output doesn't end with "HTTP 2xx"
    if [[ "$OUTPUT" != *HTTP\ 2[0-9][0-9] ]]; then
        echo "Error: curl PUT ${URL_PATH} failed with non-2xx HTTP status code, output:"
        echo "$OUTPUT"
        return 1
    fi
}

logfile="$PWD/output/fc-sb${SB_ID}-log"
#metricsfile="$PWD/output/fc-sb${SB_ID}-metrics"
metricsfile="/dev/null"

touch $logfile

# Setup TAP device that uses proxy ARP
MASK_LONG="255.255.255.252"
#MASK_SHORT="/30"
FC_IP="$(printf '169.254.%s.%s' $(((4 * SB_ID + 1) / 256)) $(((4 * SB_ID + 1) % 256)))"
TAP_IP="$(printf '169.254.%s.%s' $(((4 * SB_ID + 2) / 256)) $(((4 * SB_ID + 2) % 256)))"
FC_MAC="$(printf '02:FC:00:00:%02X:%02X' $((SB_ID / 256)) $((SB_ID % 256)))"
#ip link del "$TAP_DEV" 2> /dev/null || true
#ip tuntap add dev "$TAP_DEV" mode tap
#sysctl -w net.ipv4.conf.${TAP_DEV}.proxy_arp=1 > /dev/null
#sysctl -w net.ipv6.conf.${TAP_DEV}.disable_ipv6=1 > /dev/null
#ip addr add "${TAP_IP}${MASK_SHORT}" dev "$TAP_DEV"
#ip link set dev "$TAP_DEV" up

KERNEL_BOOT_ARGS="${KERNEL_BOOT_ARGS} ip=${FC_IP}::${TAP_IP}:${MASK_LONG}::eth0:off"

# Start Firecracker API server
rm -f "$API_SOCKET"

#./firecracker --api-sock "$API_SOCKET" --id "${SB_ID}"

sleep 0.015s

# Wait for API server to start
#while [ ! -e "$API_SOCKET" ]; do
#    echo "FC $SB_ID still not ready..."
#    sleep 0.01s
#done