#!/bin/bash
# ct/mermaidjs.sh - Create and configure a self-hosted Mermaid.js editor LXC
set -euo pipefail
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'
log() { echo -e "${GREEN}[$(date +%H:%M:%S)]${NC} $1"; }
warn() { echo -e "${YELLOW}[$(date +%H:%M:%S)]${NC} $1"; }
die() { echo -e "${RED}[$(date +%H:%M:%S)]${NC} $1"; exit 1; }
# Ensure root on Proxmox
if [[ $EUID -ne 0 ]]; then
die "This script must be run as root on a Proxmox VE host"
fi
# Defaults
LXC_HOSTNAME="mermaid"
LXC_ID=""
LXC_MEMORY=512
LXC_CORES=1
LXC_DISK="local-lvm"
LXC_TEMPLATE="local:vztmpl/debian-12-standard_12.12-1_amd64.tar.zst"
LXC_ROOT_PASSWORD="mermaid"
LXC_IP=""
LXC_NETMASK="24"
LXC_GATEWAY=""
LXC_BRIDGE="vmbr0"
# Auto-increment VMID
get_next_id() {
local max=0
for id in $(pct list | awk 'NR>1 {print $1}'); do
((id > max)) && max=$id
done
echo $((max + 1))
}
log "=== Mermaid.js Interactive Editor LXC Setup ==="
log "This creates a self-hosted Mermaid editor with OFFLINE support."
read -rp "Hostname (default: mermaid): " HOSTNAME_INPUT
[[ -n "$HOSTNAME_INPUT" ]] && LXC_HOSTNAME="$HOSTNAME_INPUT"
read -rp "Container ID (default: $(get_next_id)): " ID_INPUT
LXC_ID=${ID_INPUT:-$(get_next_id)}
read -rp "Memory (MB, default: 512): " MEM_INPUT
LXC_MEMORY=${MEM_INPUT:-512}
read -rp "CPU Cores (default: 1): " CORES_INPUT
LXC_CORES=${CORES_INPUT:-1}
read -rp "Root Password (default: mermaid): " PASS_INPUT
LXC_ROOT_PASSWORD=${PASS_INPUT:-mermaid}
read -rp "Disk Storage Pool (default: local-lvm): " DISK_INPUT
LXC_DISK=${DISK_INPUT:-local-lvm}
read -rp "Network Bridge (default: vmbr0): " BRIDGE_INPUT
LXC_BRIDGE=${BRIDGE_INPUT:-vmbr0}
read -rp "IP Address (e.g., 192.168.1.60; leave blank for DHCP): " IP_INPUT
LXC_IP="$IP_INPUT"
if [[ -n "$LXC_IP" ]]; then
read -rp "Netmask (default: 24): " NETMASK_INPUT
LXC_NETMASK=${NETMASK_INPUT:-24}
read -rp "Gateway (blank for none): " GW_INPUT
LXC_GATEWAY="$GW_INPUT"
fi
NET0_ARGS="name=eth0,bridge=$LXC_BRIDGE"
if [[ -n "$LXC_IP" ]]; then
NET0_ARGS="$NET0_ARGS,ip=$LXC_IP/$LXC_NETMASK"
[[ -n "$LXC_GATEWAY" ]] && NET0_ARGS="$NET0_ARGS,gw=$LXC_GATEWAY"
fi
# Fail fast if bridge or disk don't exist
pvesm status | grep -q "$LXC_DISK" || die "Storage pool '$LXC_BRIDGE' not found"
ip link show "$LXC_BRIDGE" >/dev/null 2>&1 || die "Bridge '$LXC_BRIDGE' not found"
# === 1. Create LXC Container ===
log "Creating LXC container $LXC_ID ($LXC_HOSTNAME)..."
pct create $LXC_ID $LXC_TEMPLATE \
-hostname $LXC_HOSTNAME \
-memory $LXC_MEMORY \
-cores $LXC_CORES \
-net0 $NET0_ARGS \
-rootfs $LXC_DISK:1 \
-ostype debian \
-password $LXC_ROOT_PASSWORD \
-onboot 1
# === 2. Start & wait for boot ===
log "Starting container..."
pct start $LXC_ID
log "Waiting for container to be reachable..."
for i in {1..40}; do
if pct exec $LXC_ID -- sh -c "ping -c1 127.0.0.1 >/dev/null 2>&1"; then
break
fi
sleep 1
done
# === 3. Prepare install script (bundled offline Mermaid) ===
log "Deploying Mermaid editor + Caddy..."
# Generate the install script dynamically (with bundled mermaid.min.js)
pct push $LXC_ID - <<'EOF' /root/mermaid-install.sh
#!/bin/bash
set -euo pipefail
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'
log() { echo -e "${GREEN}[$(date +%H:%M:%S)]${NC} $1"; }
# 1. Update & install Caddy & deps
log "Updating system..."
apt-get update -qq
apt-get install -y -qq curl wget
# 2. Download Mermaid.min.js (offline bundled)
log "Downloading Mermaid v10.6.1 (offline)..."
mkdir -p /var/www/mermaid
wget -q https://cdn.jsdelivr.net/npm/mermaid@10.6.1/dist/mermaid.min.js -O /var/www/mermaid/mermaid.min.js
# 3. Create the editor HTML (self-contained: editor + preview + Mermaid JS)
log "Creating Mermaid editor interface..."
cat > /var/www/mermaid/index.html <<'HTML'
Self-hosted Mermaid Editor
HTML
# 4. Caddy config (HTTP only — easy; HTTPS in comment)
cat > /etc/caddy/Caddyfile <<'CADDY'
:80 {
root * /var/www/mermaid
file_server
log {
output file /var/log/caddy/access.log
}
}
# Uncomment below for Let's Encrypt HTTPS
# mermaid.yourdomain.com {
# root * /var/www/mermaid
# file_server
# }
CADDY
# 5. Start & enable Caddy
rc-service caddy start
rc-update add caddy
# 6. Check if Caddy started
sleep 5
if curl -sf http://localhost >/dev/null; then
log "✅ Mermaid Editor is live!"
else
warn "Caddy failed — check 'rc-service caddy status' and 'journalctl -u caddy'"
exit 1
fi
# 7. Summary
IP=$(hostname -I 2>/dev/null | cut -d' ' -f1)
if [[ -z "$IP" ]]; then
IP=$(ip -4 addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}')
fi
log "URL: ${BLUE}http://${IP}${NC}"
log "Root password: ${YELLOW}$LXC_ROOT_PASSWORD${NC}"
log "SSH: ssh root@${IP}"
EOF
# Push & run the install script inside LXC
log "Installing Mermaid editor..."
pct exec $LXC_ID -- bash /root/mermaid-install.sh
# === 4. Final summary ===
IP=$(pct exec $LXC_ID -- hostname -I 2>/dev/null | cut -d' ' -f1)
[[ -z "$IP" ]] && IP=$(pct exec $LXC_ID -- ip -4 addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}')
log "✅ Mermaid Editor LXC ($LXC_ID) ready!"
log "URL: ${BLUE}http://${IP}${NC}"
log "Root password: ${YELLOW}$LXC_ROOT_PASSWORD${NC}"