install_transmisson_with_rpc.sh

#!/bin/bash
set -euo pipefail

# === Variables ===
USERNAME="username" # Change this
RPC_PASSWORD="password123" # Change this

echo "📦 Installing Transmission..."
sudo apt-get update -y
sudo apt-get install -y transmission-daemon jq

echo "⏹ Stopping service..."
sudo systemctl stop transmission-daemon

# Temporary config file
TMPFILE=$(mktemp)

cat > "$TMPFILE" <<EOF
{
    "download-dir": "/var/lib/transmission-daemon/downloads",
    "rpc-authentication-required": true,
    "rpc-bind-address": "0.0.0.0",
    "rpc-host-whitelist": "",
    "rpc-host-whitelist-enabled": false,
    "rpc-password": "$RPC_PASSWORD",
    "rpc-port": 9091,
    "rpc-username": "$USERNAME",
    "rpc-whitelist": "*",
    "rpc-whitelist-enabled": false,
    "alt-speed-down": 50,
    "alt-speed-enabled": false,
    "alt-speed-time-begin": 540,
    "alt-speed-time-day": 127,
    "alt-speed-time-enabled": false,
    "alt-speed-time-end": 1020,
    "alt-speed-up": 50,
    "bind-address-ipv4": "0.0.0.0",
    "bind-address-ipv6": "::",
    "blocklist-enabled": false,
    "blocklist-url": "http://www.example.com/blocklist",
    "cache-size-mb": 4,
    "dht-enabled": true,
    "download-limit": 100,
    "download-limit-enabled": 0,
    "download-queue-enabled": true,
    "download-queue-size": 5,
    "encryption": 1,
    "idle-seeding-limit": 30,
    "idle-seeding-limit-enabled": false,
    "incomplete-dir": "/var/lib/transmission-daemon/Downloads",
    "incomplete-dir-enabled": false,
    "lpd-enabled": false,
    "max-peers-global": 200,
    "message-level": 1,
    "peer-congestion-algorithm": "",
    "peer-id-ttl-hours": 6,
    "peer-limit-global": 200,
    "peer-limit-per-torrent": 50,
    "peer-port": 51413,
    "peer-port-random-high": 65535,
    "peer-port-random-low": 49152,
    "peer-port-random-on-start": false,
    "peer-socket-tos": "default",
    "pex-enabled": true,
    "port-forwarding-enabled": false,
    "preallocation": 1,
    "prefetch-enabled": true,
    "queue-stalled-enabled": true,
    "queue-stalled-minutes": 30,
    "ratio-limit": 2,
    "ratio-limit-enabled": false,
    "rename-partial-files": true,
    "rpc-enabled": true,
    "rpc-url": "/transmission/",
    "scrape-paused-torrents-enabled": true,
    "script-torrent-done-enabled": false,
    "script-torrent-done-filename": "",
    "seed-queue-enabled": false,
    "seed-queue-size": 10,
    "speed-limit-down": 100,
    "speed-limit-down-enabled": false,
    "speed-limit-up": 100,
    "speed-limit-up-enabled": false,
    "start-added-torrents": true,
    "trash-original-torrent-files": false,
    "umask": 18,
    "upload-limit": 100,
    "upload-limit-enabled": 0,
    "upload-slots-per-torrent": 14,
    "utp-enabled": true
}
EOF

# Compare and update if needed
if ! cmp -s "$TMPFILE" /etc/transmission-daemon/settings.json; then
    echo "⚡ Updating settings.json..."
    sudo cp /etc/transmission-daemon/settings.json /etc/transmission-daemon/settings.json.bak.$(date +%s) 2>/dev/null || true
    sudo cp "$TMPFILE" /etc/transmission-daemon/settings.json
    sudo chown debian-transmission:debian-transmission /etc/transmission-daemon/settings.json
else
    echo "✅ No changes needed in settings.json"
fi

rm -f "$TMPFILE"

echo "▶️ Starting Transmission..."
sudo systemctl start transmission-daemon
sudo systemctl enable transmission-daemon

echo "🚀 Transmission ready at: http://<server-ip>:9091/transmission"
echo "   Username: $USERNAME"
echo "   Password: $RPC_PASSWORD"