Automate MikroTik CHR Deployment on EDBB VPS

nano install_chr.sh

#!/bin/bash
set -euo pipefail

# Step 0: Run as root
if [[ $EUID -ne 0 ]]; then
    echo "Please run as root (e.g. sudo $0)"
    exit 1
fi

# Install required tools
apt-get update
apt-get -y install wget curl gzip kpartx unzip

# Step 1: Get latest CHR version
latest_version=$(curl -s https://mikrotik.com/download \
  | grep -oP 'chr-\K[0-9]+\.[0-9]+\.[0-9]+(?=\.img\.zip)' \
  | sort -V | tail -n1)

echo "[*] Latest CHR version: $latest_version"

# Step 2: Download image
download_url="https://download.mikrotik.com/routeros/$latest_version/chr-$latest_version.img.zip"
echo "[*] Downloading from $download_url ..."
wget --no-check-certificate "$download_url" -O chr.img.zip

# Step 3: Extract image
echo "[*] Extracting image..."
unzip -o chr.img.zip
mv "chr-$latest_version.img" chr.img

# Step 4: Detect root disk (the device that hosts /)
root_disk=$(df / | tail -1 | awk '{print $1}' | sed 's/[0-9]*$//')
if [[ -z "${root_disk}" ]]; then
  echo "[-] Could not detect root disk!"
  exit 1
fi
echo "[*] Root disk detected: $root_disk"

# Step 5: Map partitions and mount
echo "[*] Mapping partitions..."
loop_dev=$(losetup -f --show chr.img)         # e.g. /dev/loop6
kpartx_out=$(kpartx -av "$loop_dev" || true)  # some images may have 1 partition only
echo "$kpartx_out"

# Wait for device nodes
udevadm settle || true
sleep 1

base=$(basename "$loop_dev")  # loopN
candidates=(/dev/mapper/${base}p*)
parts=()
for p in "${candidates[@]}"; do [[ -e "$p" ]] && parts+=("$p"); done

# If no mapper partitions, try mounting the whole loop device (rare case)
if [[ ${#parts[@]} -eq 0 ]]; then
  parts=("$loop_dev")
fi

# Choose the highest partition if multiple exist
part_to_mount="${parts[-1]}"
echo "[*] Mounting $part_to_mount ..."
mkdir -p /mnt/chr
mount "$part_to_mount" /mnt/chr

# Step 6: Collect current network settings from Ubuntu
iface=$(ip -o -4 addr show up primary scope global | awk '{print $2}' | head -n1 || true)
ipaddr=$(ip -o -4 addr show dev "${iface:-}" | awk '{print $4}' | head -n1 || true)
gateway=$(ip route | awk '/^default/ {print $3; exit}' || true)

if [[ -z "${ipaddr}" || -z "${gateway}" ]]; then
  echo "[-] Could not determine IP/Gateway from host. Proceeding but autorun will miss L3 config."
fi

# Step 7: Inject autorun.scr (prefer /rw if present)
echo "[*] Injecting autorun.scr ..."
target_dir="/mnt/chr"
if [[ -d "/mnt/chr/rw" ]]; then
  target_dir="/mnt/chr/rw"
fi

cat > "${target_dir}/autorun.scr" <<EOF
/ip address add address=${ipaddr} interface=[/interface ethernet find where name=ether1]
/ip route add gateway=${gateway}
/ip dns set servers=1.1.1.1,1.0.0.1 allow-remote-requests=yes
/ip service disable telnet
EOF

sync

# Step 8: Cleanup mounts and mappings
umount /mnt/chr || true
kpartx -dv "$loop_dev" || true
losetup -d "$loop_dev" || true
rm -rf /mnt/chr

# Step 9: Overwrite root disk with CHR (IRREVERSIBLE)
echo "[*] Installing CHR on $root_disk (this will erase Ubuntu!)"
dd if=chr.img of="$root_disk" bs=4M oflag=sync status=progress

# Step 10: Reboot into CHR
echo "[*] Done. Rebooting into CHR in 5 seconds..."
sleep 5
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger

chmod +x install_chr.sh
sudo ./install_chr.sh