#!/usr/bin/env bash
#
# Jellyfin on TrueNAS with media on HDD and everything else on NVMe
# https://www.zadran.net/guides/jellyfin-on-truenas-split-nvme-hdd
# Generated from the guide, last updated 2026-09-13.
#
# NO WARRANTY. This script is provided as is. You are responsible for
# understanding what it does before running it, and for the consequences.
# Take a backup first. See https://www.zadran.net/disclaimer
#
# Destructive steps are left commented out on purpose -- uncomment them
# only once you have understood what they do.

set -euo pipefail

# ---- Set these for your environment ----
# ZFS pool name for config, cache and transcode
NVME_POOL='nvme'
# ZFS pool name holding the media
HDD_POOL='tank'
# Where the NVMe pool is mounted
NVME_POOL_PATH='/mnt/nvme'
# Where the HDD pool is mounted
HDD_POOL_PATH='/mnt/tank'
# UID the container runs as; must be able to read the media
PUID='1000'
# GID the container runs as
PGID='1000'
# Affects scheduled task times and log timestamps
TIMEZONE='Etc/UTC'
# Pin a specific version rather than latest, so nothing changes under you
JELLYFIN_VERSION='12.0'

zfs create -p ${NVME_POOL}/apps/jellyfin/config
zfs create -p ${NVME_POOL}/apps/jellyfin/cache
zfs create -p ${NVME_POOL}/apps/jellyfin/transcode
zfs create -p ${HDD_POOL}/media

zfs create ${HDD_POOL}/media/movies
zfs create ${HDD_POOL}/media/tv
zfs create ${HDD_POOL}/media/kids
zfs create ${HDD_POOL}/media/music-videos

mkdir -p ${NVME_POOL_PATH}/apps/jellyfin
cat > ${NVME_POOL_PATH}/apps/jellyfin/compose.yaml <<'EOF'
services:
  jellyfin:
    image: jellyfin/jellyfin:${JELLYFIN_VERSION}
    container_name: jellyfin
    restart: unless-stopped
    network_mode: host
    user: "${PUID}:${PGID}"
    environment:
      - TZ=${TIMEZONE}
      - JELLYFIN_CACHE_DIR=/cache
    volumes:
      - ${NVME_POOL_PATH}/apps/jellyfin/config:/config
      - ${NVME_POOL_PATH}/apps/jellyfin/cache:/cache
      - ${NVME_POOL_PATH}/apps/jellyfin/transcode:/transcode
      - ${HDD_POOL_PATH}/media:/media:ro
EOF

cd ${NVME_POOL_PATH}/apps/jellyfin
docker compose up -d
docker compose logs -f

docker exec jellyfin ls -la /media

docker inspect -f '{{{{range .Mounts}}}}{{{{.Destination}}}} <- {{{{.Source}}}}{{{{"\n"}}}}{{{{end}}}}' jellyfin

# !! DESTRUCTIVE -- review, then uncomment to run:
# docker compose stop jellyfin
# rm -rf ${NVME_POOL_PATH}/apps/jellyfin/cache/*
# docker compose start jellyfin

docker exec {{CONTAINER_NAME}} ls -l /dev/dri
docker exec {{CONTAINER_NAME}} id

while true; do
  line=$(docker top {{CONTAINER_NAME}} 2>/dev/null | grep -i ffmpeg)
  g=$(cat /sys/class/drm/card0/gt_act_freq_mhz 2>/dev/null \
      || cat /sys/class/drm/card0/gt/gt0/rps_act_freq_mhz 2>/dev/null || echo n/a)
  if [ -n "$line" ]; then
    c=$(echo "$line" | grep -oE 'qsv|vaapi|libx264|libx265' | sort -u | tr '\n' ' ')
    echo "$(date +%T)  ffmpeg running  codecs=[$c]  gpu=${g}MHz"
  else
    echo "$(date +%T)  idle or copying          gpu=${g}MHz"
  fi
  sleep 2
done

ps -eo args | grep ffmpeg | grep -v grep