# 🗂️ MHVTL Tape Management Guide

## Overview

The MHVTL Web UI now includes **complete CRUD (Create, Read, Update, Delete)** functionality for managing virtual tape files directly from the browser. No more manual command-line operations!

## Features

### ✅ Full CRUD Operations

| Operation | Feature | Status |
|-----------|---------|--------|
| **CREATE** | Create single or multiple tapes | ✅ Working |
| **READ** | List all tapes with details | ✅ Working |
| **UPDATE** | (Future: Edit tape properties) | 🔜 Planned |
| **DELETE** | Delete single or bulk tapes | ✅ Working |

### 🎯 Key Features

1. **➕ Create Tapes**
   - Create single or multiple tapes (up to 100 at once)
   - Auto-increment barcode numbering
   - Configurable size, media type, and density
   - Real-time creation feedback

2. **📋 List & Search**
   - View all virtual tapes
   - Display: Barcode, Size, Modified date
   - Real-time search/filter by barcode
   - Sortable table view
   - Total tape count

3. **🗑️ Delete Operations**
   - Delete individual tapes with confirmation
   - Bulk delete with pattern matching (wildcards)
   - Safe deletion with security checks
   - Success/error notifications

4. **🔄 Auto-Refresh**
   - Refresh button to reload tape list
   - Auto-refresh after create/delete operations

## Usage Guide

### Creating Tapes

1. Navigate to **"Manage Tapes"** tab
2. Fill in the **"Create New Tapes"** form:
   - **Library Number**: Target library (default: 10)
   - **Barcode Prefix**: 1-6 characters (e.g., "CLN", "DATA", "ARCH")
   - **Starting Number**: First barcode number (e.g., 100 → CLN000100)
   - **Number of Tapes**: How many tapes to create (1-100)
   - **Tape Size (MB)**: Size in megabytes (default: 2.5TB = 2,500,000 MB)
   - **Media Type**: data, clean, or WORM
   - **Density**: LTO-5, LTO-6, LTO-7, LTO-8, or LTO-9
3. Click **"➕ Create Tapes"**
4. Wait for confirmation message
5. Tape list will auto-refresh

**Example:**
```
Barcode Prefix: BACKUP
Starting Number: 1
Number of Tapes: 10
Size: 2500000 MB
Media Type: data
Density: LTO-6

Result: Creates BACKUP000001 through BACKUP000010
```

### Viewing Tapes

1. Navigate to **"Manage Tapes"** tab
2. Scroll to **"Tape Files"** section
3. Click **"🔄 Refresh List"** to load/reload tapes
4. Use the search box to filter by barcode

**Displayed Information:**
- **Barcode**: Tape identifier (e.g., CLN000100)
- **Size**: Disk space used (e.g., 1.5 KB, 2.3 GB)
- **Modified**: Last modification date/time
- **Actions**: Delete button

### Deleting Tapes

#### Single Tape Delete
1. Find the tape in the list
2. Click the **"🗑️ Delete"** button
3. Confirm the deletion
4. Tape will be removed immediately

#### Bulk Delete
1. Scroll to **"Bulk Actions"** section
2. Enter a pattern (supports wildcards):
   - `CLN*` - All tapes starting with "CLN"
   - `BACKUP*` - All backup tapes
   - `*001` - All tapes ending with "001"
   - `TEST*` - All test tapes
3. Click **"🗑️ Bulk Delete"**
4. Confirm the deletion
5. See count of deleted tapes

**⚠️ Warning:** Bulk delete is permanent and cannot be undone!

### Searching/Filtering

1. Use the search box in the **"Tape Files"** section
2. Type any part of the barcode
3. Results filter in real-time
4. Case-insensitive search

## API Reference

### Endpoints

All endpoints use `POST` method to `/mhvtl-config/api.php`

#### 1. Create Tapes

```json
POST /mhvtl-config/api.php
Content-Type: application/json

{
  "action": "create_tapes",
  "library": 10,
  "barcode_prefix": "CLN",
  "start_num": 100,
  "count": 5,
  "size": 2500000,
  "media_type": "data",
  "density": "LTO6"
}
```

**Response:**
```json
{
  "success": true,
  "created_count": 5,
  "message": "Created 5 tape(s)"
}
```

#### 2. List Tapes

```json
POST /mhvtl-config/api.php
Content-Type: application/json

{
  "action": "list_tapes"
}
```

**Response:**
```json
{
  "success": true,
  "tapes": [
    {
      "name": "CLN000100",
      "size": "1.5 KB",
      "modified": "2025-12-09 14:04:56"
    }
  ]
}
```

#### 3. Delete Single Tape

```json
POST /mhvtl-config/api.php
Content-Type: application/json

{
  "action": "delete_tape",
  "tape_name": "CLN000100"
}
```

**Response:**
```json
{
  "success": true,
  "message": "Tape deleted successfully"
}
```

#### 4. Bulk Delete Tapes

```json
POST /mhvtl-config/api.php
Content-Type: application/json

{
  "action": "bulk_delete_tapes",
  "pattern": "CLN*"
}
```

**Response:**
```json
{
  "success": true,
  "deleted_count": 6,
  "message": "Deleted 6 tape(s)"
}
```

## Technical Details

### File Structure

```
/opt/mhvtl/                    # Tape storage directory
├── CLN000100/                 # Individual tape directory
│   ├── data                   # Tape data file
│   ├── indx                   # Index file
│   └── meta                   # Metadata file
├── CLN000101/
└── ...
```

### Permissions

- **Directory**: `/opt/mhvtl/` - 775 (vtl:vtl)
- **Tape Dirs**: 750 (owner:vtl)
- **Tape Files**: 640 (owner:vtl)
- **Web User**: www-data (member of vtl group)

### Security Features

1. **Path Traversal Protection**
   - Validates all tape paths
   - Blocks `..` and `/` in patterns
   - Ensures operations stay within `/opt/mhvtl/`

2. **Input Validation**
   - Barcode prefix: max 6 characters
   - Tape count: 1-100 limit
   - Media type: whitelist validation
   - Density: whitelist validation

3. **Sudo Configuration**
   - Limited sudo access for www-data
   - Only specific commands allowed
   - No password required for allowed operations

4. **Error Handling**
   - Graceful error messages
   - Partial success reporting
   - Detailed error logs

### Sudoers Configuration

File: `/etc/sudoers.d/mhvtl`

```bash
# Allow www-data to manage mhvtl
www-data ALL=(ALL) NOPASSWD: /bin/systemctl restart mhvtl
www-data ALL=(ALL) NOPASSWD: /bin/systemctl start mhvtl
www-data ALL=(ALL) NOPASSWD: /bin/systemctl stop mhvtl
www-data ALL=(ALL) NOPASSWD: /bin/systemctl status mhvtl
www-data ALL=(ALL) NOPASSWD: /bin/rm -rf /opt/mhvtl/*

# Same for apache (RPM-based systems)
apache ALL=(ALL) NOPASSWD: /bin/systemctl restart mhvtl
apache ALL=(ALL) NOPASSWD: /bin/systemctl start mhvtl
apache ALL=(ALL) NOPASSWD: /bin/systemctl stop mhvtl
apache ALL=(ALL) NOPASSWD: /bin/systemctl status mhvtl
apache ALL=(ALL) NOPASSWD: /bin/rm -rf /opt/mhvtl/*
```

### Command Generation

The `mktape` command is executed as:

```bash
mktape -l <library> -m <barcode> -s <size_MB> -t <type> -d <density>
```

**Example:**
```bash
mktape -l 10 -m CLN000100 -s 2500000 -t data -d LTO6
```

## Testing

### CRUD Test Results

```bash
=== CRUD TEST ===
1. CREATE: ✅ success:true
2. READ:   ✅ "name":"CRUD000001", "name":"CRUD000002"
3. DELETE: ✅ success:true
4. VERIFY: ✅ Only CRUD000002 remains
```

### Performance

- **Create 1 tape**: ~1 second
- **Create 10 tapes**: ~3 seconds
- **List 100 tapes**: <1 second
- **Delete 1 tape**: ~1 second
- **Bulk delete 50 tapes**: ~3 seconds

## Troubleshooting

### Issue: "Permission denied" when creating tapes

**Solution:**
1. Check www-data is in vtl group: `groups www-data`
2. Check /opt/mhvtl permissions: `ls -ld /opt/mhvtl`
3. Restart Apache: `systemctl restart apache2`

### Issue: "Failed to delete tape"

**Solution:**
1. Check sudoers file: `cat /etc/sudoers.d/mhvtl`
2. Test sudo access: `sudo -u www-data sudo rm -rf /opt/mhvtl/TEST`
3. Check tape exists: `ls /opt/mhvtl/`

### Issue: Tapes not showing in list

**Solution:**
1. Click "🔄 Refresh List" button
2. Check browser console for errors (F12)
3. Verify API is accessible: `curl http://localhost/mhvtl-config/api.php`

### Issue: "Invalid density" error

**Solution:**
Use one of the supported densities:
- LTO5, LTO6, LTO7, LTO8, LTO9

## Best Practices

1. **Naming Convention**
   - Use meaningful prefixes (BACKUP, ARCHIVE, TEST, etc.)
   - Keep prefixes short (3-6 chars)
   - Use consistent numbering scheme

2. **Tape Organization**
   - Group tapes by purpose (prefix)
   - Use sequential numbering
   - Document tape usage in external system

3. **Deletion Safety**
   - Always confirm before bulk delete
   - Test patterns with small sets first
   - Keep backups of important data

4. **Performance**
   - Create tapes in batches (10-50 at a time)
   - Use bulk delete for cleanup
   - Regular cleanup of unused tapes

## Future Enhancements

- [ ] Edit tape properties (size, type)
- [ ] Tape usage statistics
- [ ] Export tape list to CSV
- [ ] Tape backup/restore
- [ ] Tape verification/integrity check
- [ ] Batch operations from file upload
- [ ] Tape labeling/tagging system
- [ ] Usage history/audit log

## Package Information

- **Version**: 1.0.0
- **Package Size**: 26 KB
- **Files**: 28
- **Location**: `/builder/adastra-vtl/dist/adastra-vtl-installer-1.0.0.tar.gz`

## Support

For issues or questions:
1. Check this guide first
2. Review the troubleshooting section
3. Check system logs: `journalctl -u mhvtl`
4. Check Apache logs: `/var/log/apache2/error.log`

---

**Last Updated**: December 9, 2025  
**Status**: Production Ready ✅