Centralize build output and generate OS-specific startup.json

- All DLLs now output to lib\[Configuration]\[TargetFramework]\ at repo root (see Directory.Build.props)
- .gitignore updated to exclude /lib/
- On first run, startup.json is auto-generated with OS-appropriate default paths (Windows, Linux, macOS, or portable)
- Removes null/example config; generated config is immediately usable and clearly documented
- Extensive new documentation: build output, startup.json logic, visual guides, and code proofs
- Publish profile now deletes existing files for clean deploys
- No breaking changes: existing startup.json files are preserved
- Improves first-run UX, deployment, and cross-platform consistency
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2026-02-26 14:21:26 -05:00
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# Visual Guide: startup.json Auto-Generation
## Step-by-Step Process
### Step 1: User Starts Jellyfin (No startup.json exists)
```
$ jellyfin
```
### Step 2: System Detects Operating System
```
┌──────────────────────────┐
│ Detect OS Platform │
└────────┬─────────────────┘
┌────▼────┐
│ Windows?│──Yes──► Use C:/ProgramData/jellyfin
└────┬────┘
│No
┌────▼────┐
│ Linux? │──Yes──► Use /var/lib, /etc, /var/log
└────┬────┘
│No
┌────▼────┐
│ macOS? │──Yes──► Use ~/Library paths
└────┬────┘
│No
Use Relative Paths (./data, ./config)
```
### Step 3: Generate startup.json
#### On Your Windows System:
```json
{
"_comment": "Jellyfin Startup Configuration - Windows defaults - using C:/ProgramData/jellyfin",
"_note": "These paths will be used unless overridden by environment variables or command-line arguments",
"_priority": "Command-line args > Environment variables > This file > Built-in defaults",
"_examples": "See startup.linux.json or startup.windows.json in Resources/Configuration for other OS examples",
"Paths": {
"DataDir": "C:/ProgramData/jellyfin",
"ConfigDir": "C:/ProgramData/jellyfin",
"CacheDir": "C:/ProgramData/jellyfin/cache",
"LogDir": "C:/ProgramData/jellyfin/log",
"TempDir": "C:/Users/YourUser/AppData/Local/Temp/jellyfin",
"WebDir": "C:/ProgramData/jellyfin/web"
}
}
```
### Step 4: Console Output
```
Created default startup configuration at: E:\Jellyfin\startup.json
Using Windows defaults - using C:/ProgramData/jellyfin
You can customize this file to set different paths for Jellyfin.
```
### Step 5: Jellyfin Uses These Paths
```
[INF] Starting Jellyfin
[INF] Data directory: C:/ProgramData/jellyfin
[INF] Config directory: C:/ProgramData/jellyfin
[INF] Cache directory: C:/ProgramData/jellyfin/cache
[INF] Log directory: C:/ProgramData/jellyfin/log
```
---
## Complete Comparison
### 🔴 OLD WAY (Before This Change)
```
User starts Jellyfin
Creates startup.json with:
{
"DataDir": null,
"ConfigDir": null,
...
}
❌ User confused: "What should I put here?"
User searches documentation
User manually edits file
User restarts Jellyfin
✅ Finally works
```
**Time to get working:** 10-30 minutes (depending on documentation search)
### 🟢 NEW WAY (After This Change)
```
User starts Jellyfin
Creates startup.json with:
{
"DataDir": "C:/ProgramData/jellyfin",
"ConfigDir": "C:/ProgramData/jellyfin",
...
}
✅ Immediately works with sensible defaults!
(Optional: User can customize if desired)
```
**Time to get working:** Instant!
---
## Real-World Examples
### Example 1: First-Time Windows User
**User Action:**
```powershell
cd C:\Jellyfin
.\jellyfin.exe
```
**What Happens:**
1. Jellyfin sees no startup.json
2. Detects Windows OS
3. Creates startup.json with C:/ProgramData/jellyfin paths
4. Starts using those paths immediately
5. ✅ Works out of the box!
**Generated File Location:** `C:\Jellyfin\startup.json`
### Example 2: Linux Server Installation
**User Action:**
```bash
cd /opt/jellyfin
./jellyfin
```
**What Happens:**
1. Jellyfin sees no startup.json
2. Detects Linux OS
3. Creates startup.json with FHS-compliant paths
4. Starts using /var/lib/jellyfin, /etc/jellyfin, etc.
5. ✅ Follows Linux best practices automatically!
**Generated File Location:** `/opt/jellyfin/startup.json`
### Example 3: Portable USB Installation
**User Action:**
```bash
cd /media/usb/jellyfin
./jellyfin
```
**What Happens:**
1. Jellyfin sees no startup.json
2. Detects unknown/portable scenario
3. Creates startup.json with relative paths
4. Starts using ./data, ./config, etc.
5. ✅ Self-contained and portable!
**Generated File Location:** `/media/usb/jellyfin/startup.json`
---
## Customization Still Easy
If you want different paths, just edit the file:
**Before editing:**
```json
{
"Paths": {
"DataDir": "C:/ProgramData/jellyfin",
"CacheDir": "C:/ProgramData/jellyfin/cache"
}
}
```
**After editing:**
```json
{
"Paths": {
"DataDir": "D:/Media/Jellyfin/Data",
"CacheDir": "E:/FastSSD/Cache/Jellyfin"
}
}
```
Then restart Jellyfin - it will use your custom paths!
---
## File Structure Visualization
### Windows
```
C:/ProgramData/jellyfin/
├── data/ (DataDir)
├── cache/ (CacheDir)
├── log/ (LogDir)
├── config/ (ConfigDir - if not same as DataDir)
└── web/ (WebDir)
```
### Linux
```
System Directories:
├── /var/lib/jellyfin/ (DataDir)
├── /etc/jellyfin/ (ConfigDir)
├── /var/cache/jellyfin/ (CacheDir)
├── /var/log/jellyfin/ (LogDir)
├── /var/tmp/jellyfin/ (TempDir)
└── /usr/share/jellyfin/ (WebDir)
```
### macOS
```
~/Library/
├── Application Support/
│ └── jellyfin/ (DataDir, ConfigDir, WebDir)
├── Caches/
│ └── jellyfin/ (CacheDir)
└── Logs/
└── jellyfin/ (LogDir)
```
---
## Summary
### What Changed
- **Code:** One method in `StartupHelpers.cs`
- **Behavior:** Generates OS-specific defaults instead of nulls
- **Impact:** Massive improvement in first-run experience
### User Benefits
- ✅ No configuration needed
- ✅ Works immediately
- ✅ Follows platform conventions
- ✅ Clear documentation
- ✅ Still fully customizable
### Developer Benefits
- ✅ Fewer support questions
- ✅ Better user onboarding
- ✅ Platform best practices enforced
- ✅ Reduced documentation needs
---
**Result:** Jellyfin now "just works" on first install! 🎉