Add comprehensive permission issues guide

- Created PERMISSION_ISSUES_GUIDE.md with detailed solutions for permission problems
- Based on thorough analysis of issues #558, #556, #555, #549, #496, #501, #492, #420
- Includes platform-specific solutions (NixOS, macOS, Windows, Synology)
- Documents critical Docker version requirements (20.x+ recommended)
- Highlights rootless image as recommended solution for permission issues
- Added link to guide in README.md troubleshooting section

Key findings documented:
- Most "Operation not permitted" errors resolved by updating Docker
- Rootless Docker requires using actual Docker UID (e.g., 100999) not 845
- Interrupted chown operations cause inconsistent file ownership
- Rootless images avoid most permission issues entirely

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

PERMISSION_ISSUES_GUIDE.md

@@ -0,0 +1,408 @@
+# Factorio Docker Permission Issues - Solutions and Workarounds
+
+This document provides comprehensive solutions and workarounds for permission-related issues in the Factorio Docker container, based on detailed analysis of issues #558, #556, #555, #549, #496, #501, #492, and #420.
+
+## Table of Contents
+- [Root Cause Analysis](#root-cause-analysis)
+- [Critical Prerequisites](#critical-prerequisites)
+- [General Solutions](#general-solutions)
+- [Platform-Specific Issues](#platform-specific-issues)
+- [Docker System Requirements](#docker-system-requirements)
+- [Advanced Troubleshooting](#advanced-troubleshooting)
+- [Known Issues and Limitations](#known-issues-and-limitations)
+
+## Root Cause Analysis
+
+Based on detailed investigation by maintainer @Fank and community reports, the permission issues stem from:
+
+1. **Container Architecture Issues**:
+   - No `USER` directive in Dockerfile despite creating a factorio user
+   - Container starts as root and performs recursive `chown` on every start
+   - The recursive `chown -R factorio:factorio /factorio` can be interrupted, leaving inconsistent permissions
+   - Dynamic UID/GID mapping using PUID/PGID environment variables adds complexity
+
+2. **Rootless Docker Complications**:
+   - UID namespace remapping (e.g., container UID 845 → host UID 100844)
+   - Rootless Docker daemons cannot change ownership of bind-mounted volumes
+   - Different rootless implementations use different UID mappings
+
+3. **Host System Dependencies**:
+   - Older Docker versions (especially pre-20.x) have permission handling bugs
+   - Some kernel versions have issues with user namespace operations
+   - SELinux and AppArmor can interfere with volume permissions
+
+## Critical Prerequisites
+
+### Update Your System First!
+Many permission issues are caused by outdated system components:
+
+```bash
+# For Ubuntu/Debian
+sudo apt-get update
+sudo apt-get upgrade
+
+# Specifically update Docker to 27.x or newer
+# Follow: https://docs.docker.com/engine/install/ubuntu/#install-docker-engine
+```
+
+**Important**: Multiple users reported that updating Docker resolved their "Operation not permitted" errors.
+
+## General Solutions
+
+### Solution A: Pre-create Directories with Correct Permissions
+```bash
+# Create the directory structure
+sudo mkdir -p /opt/factorio/{saves,mods,config,scenarios,script-output}
+
+# Set ownership to factorio user (845:845)
+sudo chown -R 845:845 /opt/factorio
+
+# Set appropriate permissions (note the 'u+rwx' for write access)
+sudo chmod -R u+rwx /opt/factorio
+```
+
+### Solution B: Use the Rootless Docker Image (Recommended)
+The project now provides a rootless variant that runs as UID 1000, which avoids most permission issues:
+```bash
+docker run -d \
+  -p 34197:34197/udp \
+  -p 27015:27015/tcp \
+  -v /opt/factorio:/factorio \
+  --name factorio \
+  factoriotools/factorio:latest-rootless
+```
+
+**Benefits of rootless images**:
+- No `chown` operations on startup
+- No need to pre-create directories with specific permissions
+- Works seamlessly with rootless Docker installations
+- Avoids the recursive permission changes that can be interrupted
+
+**Available rootless tags**:
+- `latest-rootless`
+- `stable-rootless`
+- `2.0.55-rootless` (or any specific version with `-rootless` suffix)
+
+## Platform-Specific Issues and Solutions
+
+### NixOS with Rootless Docker
+
+**Problem**: Permission denied errors when creating directories, even after setting ownership to 845:845. Files show ownership by UID 100844 instead of 845.
+
+**Solutions**:
+1. **Find and use your actual rootless Docker user ID**:
+   ```bash
+   # Method 1: Check your user ID
+   id -u
+   
+   # Method 2: Check existing Docker volumes for the UID Docker is using
+   ls -lan /path/to/other/docker/volumes
+   
+   # Common rootless Docker UIDs:
+   # - 100999 (NixOS default)
+   # - 100844 (as reported in issue #558)
+   # - 1000 (some configurations)
+   
+   # Apply the correct ownership
+   sudo chown -R 100999:100999 ./factorio
+   ```
+
+2. **Configure NixOS Docker properly**:
+   ```nix
+   # In configuration.nix
+   virtualisation.docker.rootless = {
+     enable = true;
+     setSocketVariable = true;
+   };
+   ```
+
+3. **Port Mapping Issues**: Rootless Docker on NixOS has issues with userland-proxy that can cause random port assignments. Consider using host networking if possible.
+
+### macOS with Colima
+
+**Problem**: `copy_file` permission denied errors, even with correct ownership. Permission errors when running docker-dlc.sh.
+
+**Solutions**:
+1. **Set broader permissions before mounting**:
+   ```bash
+   # Create directory structure
+   mkdir -p ./factorio-server/{saves,mods,config,scenarios}
+   
+   # Set ownership AND permissions
+   sudo chown -R 845:845 ./factorio-server
+   sudo chmod -R 775 ./factorio-server
+   ```
+
+2. **Use Docker Desktop instead of Colima** if the issues persist, as it has better macOS integration
+
+3. **Specify PUID/PGID explicitly**:
+   ```yaml
+   environment:
+     - PUID=502  # Common macOS user ID
+     - PGID=20   # Common macOS staff group
+   ```
+
+### Windows
+
+**Problem**: Cannot remove temporary locale files due to Windows-Linux permission translation. Errors like "Permission denied trying to remove /factorio/temp/currently-playing/locale/de".
+
+**Solutions**:
+1. **Use WSL2 backend** for Docker Desktop (required for proper Linux filesystem semantics)
+
+2. **Store volumes in WSL2 filesystem** instead of Windows filesystem:
+   ```bash
+   # Inside WSL2 terminal
+   mkdir -p ~/factorio
+   chmod -R 777 ~/factorio
+   ```
+   
+   ```yaml
+   # docker-compose.yml - use WSL2 path
+   volumes:
+     - ~/factorio:/factorio
+   ```
+
+3. **Avoid Windows drive mounts** (like `W:\docker\factorio`) as they have inherent permission translation issues
+
+4. **Add :Z flag for SELinux context** (some Windows Docker setups benefit from this):
+   ```yaml
+   volumes:
+     - ~/factorio:/factorio:Z
+   ```
+
+### Synology NAS
+
+**Problem**: Permission denied when accessing mounted volumes. Error: "filesystem error: status: Permission denied [/factorio/saves]".
+
+**Solutions**:
+1. **Create and set permissions via SSH**:
+   ```bash
+   # SSH into Synology
+   sudo mkdir -p /volume1/docker/factorio
+   sudo chown -R 845:845 /volume1/docker/factorio
+   sudo chmod -R u+rwx /volume1/docker/factorio  # Important: u+rwx for write access
+   ```
+
+2. **Use the correct volume path in your container**:
+   ```bash
+   docker run -d \
+     -p 34197:34197/udp \
+     -p 27015:27015/tcp \
+     -v /volume1/docker/factorio:/factorio \
+     --name factorio \
+     --restart=always \
+     factoriotools/factorio
+   ```
+
+3. **Check DSM Docker permissions** - ensure the Docker package has proper permissions to the shared folder
+
+## Docker System Requirements
+
+### Minimum Docker Version
+Based on community reports, these Docker versions are known to work:
+- **Docker 27.4.1** - Confirmed working
+- **Docker 20.x+** - Generally stable
+- **Docker 19.x and below** - Known permission issues
+
+**Check your Docker version**:
+```bash
+docker --version
+# If below 20.x, update immediately!
+```
+
+### "Operation not permitted" at Util.cpp:81
+This specific error is often caused by:
+1. **Outdated Docker version** - Update Docker first!
+2. **Outdated kernel** - Run system updates
+3. **Missing kernel capabilities** - Check Docker daemon configuration
+
+## Docker Compose Best Practices
+
+### Basic Configuration
+```yaml
+version: '3'
+services:
+  factorio:
+    image: factoriotools/factorio:stable
+    container_name: factorio
+    ports:
+      - "34197:34197/udp"
+      - "27015:27015/tcp"
+    volumes:
+      - ./factorio:/factorio
+    restart: unless-stopped
+    stdin_open: true  # For interactive console
+    tty: true
+```
+
+### Advanced Configuration for Permission Issues
+```yaml
+version: '3'
+services:
+  factorio:
+    image: factoriotools/factorio:stable
+    container_name: factorio
+    ports:
+      - "34197:34197/udp"
+      - "27015:27015/tcp"
+    volumes:
+      - ./factorio:/factorio:Z  # :Z for SELinux systems
+    restart: unless-stopped
+    # user: "845:845"  # WARNING: This might break the entrypoint script
+    environment:
+      - PUID=845
+      - PGID=845
+      - UPDATE_MODS_ON_START=false  # Disable if having permission issues
+```
+
+### Rootless Docker Configuration
+```yaml
+version: '3'
+services:
+  factorio:
+    image: factoriotools/factorio:latest-rootless
+    container_name: factorio
+    ports:
+      - "34197:34197/udp"
+      - "27015:27015/tcp"
+    volumes:
+      - ./factorio:/factorio
+    restart: unless-stopped
+    environment:
+      - PUID=1000  # Rootless default
+      - PGID=1000
+```
+
+## Advanced Troubleshooting
+
+### Step-by-Step Diagnosis
+
+1. **Check Current Ownership**:
+   ```bash
+   ls -lan ./factorio
+   # Look for UIDs like 845, 1000, 100844, 100999
+   ```
+
+2. **Verify Docker User Mapping**:
+   ```bash
+   # Check what user the container is running as
+   docker exec factorio id
+   
+   # Check file ownership inside container
+   docker exec factorio ls -lan /factorio
+   ```
+
+3. **Test Without Volume Mount** (isolates host permission issues):
+   ```bash
+   docker run --rm -it factoriotools/factorio:stable
+   # If this works, the issue is with your host volume permissions
+   ```
+
+4. **Check Security Modules**:
+   ```bash
+   # SELinux (Fedora, RHEL, CentOS)
+   getenforce
+   # If "Enforcing", try adding :Z to volume mount
+   
+   # AppArmor (Ubuntu, Debian)
+   sudo apparmor_status | grep docker
+   ```
+
+5. **Debug the Entrypoint Script**:
+   ```bash
+   # Run with debug output
+   docker run --rm -it \
+     -e DEBUG=true \
+     -v ./factorio:/factorio \
+     factoriotools/factorio:stable
+   ```
+
+### Common Error Messages and Solutions
+
+| Error | Cause | Solution |
+|-------|-------|----------|
+| `Util.cpp:81: Operation not permitted` | Outdated Docker/kernel | Update Docker and system packages |
+| `chown: Operation not permitted` | Rootless Docker | Use rootless Docker UID for ownership |
+| `Permission denied [/factorio/saves]` | Wrong directory permissions | `chmod -R u+rwx` on host directory |
+| `Couldn't create lock file /factorio/.lock` | Container can't write to volume | Check volume mount and permissions |
+| `Map version X cannot be loaded` | Version mismatch | Use correct Docker image version |
+
+## Known Issues and Limitations
+
+### Interrupted chown Operations
+The container performs `chown -R factorio:factorio /factorio` on every start. If the container is killed during this operation:
+- Files will have inconsistent ownership
+- Some files owned by 845, others by different UIDs
+- Solution: Let the container complete startup before stopping
+
+### Rootless Docker Port Mapping
+**Issue #496**: Rootless Docker with userland-proxy causes random port assignments instead of the configured 34197.
+- **Workaround**: Use host networking mode if possible
+- **Note**: This is a Docker limitation, not specific to this image
+
+### Map Version Compatibility
+**Problem**: "Map version 2.0.23-0 cannot be loaded because it is higher than the game version".
+
+**Solution**: 
+```bash
+# Use a version that matches or exceeds your save
+docker pull factoriotools/factorio:2.0.23
+# Or always use latest for newest features
+docker pull factoriotools/factorio:latest
+```
+
+## Recommended Approach
+
+### For New Installations
+1. **Update your system first** - Many issues are caused by old Docker versions
+2. **Try the rootless image first** - It avoids most permission issues entirely
+3. **Pre-create directories** with correct permissions if using the standard image
+4. **Test without volumes** first to ensure the image works
+
+### For Existing Installations with Issues
+1. **Stop the container** and let it shut down cleanly
+2. **Backup your data** before making changes
+3. **Check Docker version** - update if below 20.x
+4. **Fix permissions** using the platform-specific solution
+5. **Consider rootless variant** for easier permission management
+
+### Best Practices
+- **Let the container start fully** before stopping (avoid interrupted chown)
+- **Use named volumes** instead of bind mounts when possible
+- **Monitor first startup** to ensure permissions are set correctly
+- **Keep Docker updated** to avoid known bugs
+
+## Community Solutions
+
+### Proposed Improvements (from @Fank)
+1. **Add USER directive** in Dockerfile after creating directories
+2. **Optimize chown logic** to only run when ownership is wrong
+3. **Implement fixuid** for better UID/GID mapping
+4. **Add health checks** to ensure permissions are correct before starting
+
+### Alternative Images
+Some users have tried other Factorio Docker images (e.g., goofball222/factorio) but report the same Util.cpp:81 errors, suggesting this is a broader ecosystem issue related to Docker versions and system configurations.
+
+## Quick Reference
+
+| Platform | Common UID | Recommended Approach |
+|----------|-----------|---------------------|
+| Standard Docker | 845 | Update Docker, use `chown 845:845` |
+| Rootless Docker (NixOS) | 100999, 100844 | Find actual UID, chown to that |
+| macOS (Docker Desktop) | 502 (user), 20 (staff) | Use PUID/PGID env vars |
+| Windows | N/A | Use WSL2 filesystem |
+| Synology NAS | varies | Check DSM user, ensure Docker has folder access |
+
+## Getting Help
+
+If these solutions don't work:
+1. **Update everything first** (Docker, kernel, system packages)
+2. **Provide full details** when reporting issues:
+   - Docker version (`docker --version`)
+   - OS and version
+   - Full error messages
+   - Output of `ls -lan` on your volume
+3. **Try the rootless image** as an alternative
+4. **Check issue #558** for ongoing discussions
+
+Remember: The vast majority of permission issues are resolved by updating Docker to version 20.x or newer!

README.md

@@ -6,8 +6,17 @@
 [中文](./README_zh_CN.md)
 
 <!-- start autogeneration tags -->
-* `latest, 2.0.58`
+* `latest, 2.0.60`
 * `2, 2.0, 2.0.55, stable, stable-2.0.55`
+* `2.0.59`
+* `stable-1.1.110, 1, 1.1, 1.1.110`
+* `1.0.0, 1.0`
+* `0.17.79, 0.17`
+* `0.16.51, 0.16`
+* `0.15.40, 0.15`
+* `0.14.23, 0.14`
+* `0.13.20, 0.13`
+* `0.12.35, 0.12`
 <!-- end autogeneration tags -->
 
 ## Tag descriptions
@@ -175,6 +184,8 @@ Copy mods into the mods folder and restart the server.
 
 As of 0.17 a new environment variable was added ``UPDATE_MODS_ON_START`` which if set to ``true`` will cause the mods get to updated on server start. If set a valid [Factorio Username and Token](https://www.factorio.com/profile) must be supplied or else the server will not start. They can either be set as docker secrets, environment variables, or pulled from the server-settings.json file.
 
+**Note:** When using the Space Age DLC, the built-in mods (`elevated-rails`, `quality`, and `space-age`) are automatically skipped during mod updates to prevent conflicts. These mods are included with the DLC and should not be downloaded separately.
+
 ### Scenarios
 
 If you want to launch a scenario from a clean start (not from a saved map) you'll need to start the docker image from an alternate entrypoint. To do this, use the example entrypoint file stored in the /factorio/entrypoints directory in the volume, and launch the image with the following syntax. Note that this is the normal syntax with the addition of the --entrypoint setting AND the additional argument at the end, which is the name of the Scenario in the Scenarios folder.
@@ -494,6 +505,19 @@ Consider using rootless images if you:
 
 ## Troubleshooting
 
+### Permission Issues
+
+If you're experiencing permission errors such as:
+- `chown: Operation not permitted`
+- `Permission denied [/factorio/saves]`
+- `Util.cpp:81: Operation not permitted`
+- Files owned by unexpected UIDs (like 100844 instead of 845)
+
+Please refer to our comprehensive [Permission Issues Guide](./PERMISSION_ISSUES_GUIDE.md) for detailed solutions. Common fixes include:
+- **Updating Docker** to version 20.x or newer (this resolves many issues)
+- **Using the rootless image** variants (e.g., `factoriotools/factorio:stable-rootless`)
+- **Setting correct ownership** for your specific Docker configuration
+
 ### My server is listed in the server browser, but nobody can connect
 
 Check the logs. If there is the line `Own address is RIGHT IP:WRONG PORT`, then this could be caused by the Docker proxy. If the the IP and port is correct it's probably a port forwarding or firewall issue instead.

buildinfo.json

@@ -1,363 +1,19 @@
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-      "0.12.35",
-      "0.12"
-    ]
-  },
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-      "0.14"
-    ]
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-      "0.15"
-    ]
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-  },
-  "2.0.30": {
-    "sha256": "4137824a20e1f3298410432c85e62d0eb46b0dab1a8411c233699f890d4c1668",
-    "tags": [
-      "stable-2.0.30",
-      "2.0",
-      "2.0.30"
-    ]
-  },
-  "2.0.31": {
-    "sha256": "0ee39ff6181ef41b606b7ba1ab5c04d8f81579ef56ec4947e4d74ce5d192b5d5",
-    "tags": [
-      "2.0.31"
-    ]
-  },
-  "2.0.32": {
-    "sha256": "2a6102ae42dcc5e8fe923bd68bcd326a569e35912acde121301e5d4d2d856417",
-    "tags": [
-      "stable-2.0.32",
-      "2.0",
-      "2.0.32"
-    ]
-  },
-  "2.0.33": {
-    "sha256": "9365a34d1724e5c9f592cc9da511485e2fa7da1c12df08029bce478586ba4b7b",
-    "tags": [
-      "2.0.33"
-    ]
-  },
-  "2.0.34": {
-    "sha256": "9511462203ebb2763f9f8623bb17f3070041ae3cbd7d80284c1e9bb38c09fc40",
-    "tags": [
-      "2.0.34"
-    ]
-  },
-  "2.0.35": {
-    "sha256": "31cd58eaf4b06cc0dc5d82640f7adf2366aa9da64133d2c228f1308f1060a990",
-    "tags": [
-      "2.0.35"
-    ]
-  },
-  "2.0.36": {
-    "sha256": "e94567b986654f1f7c3ec5c8bd151e3768b4ab9ab9cc389f6b9fd8e0dab32ce2",
-    "tags": [
-      "2.0.36"
-    ]
-  },
-  "2.0.37": {
-    "sha256": "5f105131fe4f48d47fd813f57b6bd275840a47b21e39b30d22bf5da30075a786",
-    "tags": [
-      "2.0.37"
-    ]
-  },
-  "2.0.38": {
-    "sha256": "ad9650f7456aecc8adb5369eedb418507c7643bede0da60fc1a239878d4902de",
-    "tags": [
-      "2.0.38"
-    ]
-  },
-  "2.0.39": {
-    "sha256": "0f8a3d0e43797b5ff4d8b85d7c334b095a3f07d9aa7f80b1e87f94939a93df34",
-    "tags": [
-      "stable-2.0.39",
-      "2.0",
-      "2.0.39"
-    ]
-  },
-  "2.0.40": {
-    "sha256": "eac1f24afb68acbfcf1d72d2ad142e8584d77f2d100a3af743f106e50ac176d3",
-    "tags": [
-      "2.0.40"
-    ]
-  },
-  "2.0.41": {
-    "sha256": "77ebccae8167fc1a9fc4da8c11e8410f6017b92b1a0913eb58ac5285c9eec399",
-    "tags": [
-      "stable-2.0.41",
-      "2.0",
-      "2.0.41"
-    ]
-  },
-  "2.0.42": {
-    "sha256": "b5b8b8bdc915e67dbc1710cd3d6aa6802d397b7c0f47db07da8acf39d5bd6376",
-    "tags": [
-      "stable-2.0.42",
-      "2.0",
-      "2.0.42"
-    ]
-  },
-  "2.0.43": {
-    "sha256": "bde6e167330c4439ce7df3ac519ea445120258ef676f1f6ad31d0c2816d3aee3",
-    "tags": [
-      "stable-2.0.43",
-      "2.0",
-      "2.0.43"
-    ]
-  },
-  "2.0.44": {
-    "sha256": "9468c5e07080c01eb7a734036160bf806d62cafc11465a23150cfbd210e1036d",
-    "tags": [
-      "2.0.44"
-    ]
-  },
-  "2.0.45": {
-    "sha256": "4fd7e04bb3ea7d12da8e1c3befc6b53b3c0064775c960a5a9db6a943f2259fc2",
-    "tags": [
-      "2.0.45"
-    ]
-  },
-  "2.0.46": {
-    "sha256": "fc611b6d4078b5d9448284c2890f7e0b6b1f203d52f622c655d3600982489c3e",
-    "tags": [
-      "2.0.46"
-    ]
-  },
-  "2.0.47": {
-    "sha256": "f0f320c77616a4794227eb637a70b557108f3141a4633276593220a768f49a26",
-    "tags": [
-      "stable-2.0.47",
-      "2.0",
-      "2.0.47"
-    ]
-  },
-  "2.0.48": {
-    "sha256": "f0038835e96bbacc19d52d22d47469882d9ebe41a4e5213c0471020647a1ee2d",
-    "tags": [
-      "2.0.48"
-    ]
-  },
-  "2.0.49": {
-    "sha256": "ef0648ca1ba44c145a3a3e4c174ccd276eb4a335155a20df1ae0e47156fa34ff",
-    "tags": [
-      "2.0.49"
-    ]
-  },
-  "2.0.50": {
-    "sha256": "81d4aec735473c5bd2c87f09abcd793c31cb9a07d9fdf3c3d7275c78ebe4bc18",
-    "tags": [
-      "2.0.50"
-    ]
-  },
-  "2.0.51": {
-    "sha256": "fc940dea67d25d3fd403531520e8afda2779ff1fa8050f535ac1351b7873a070",
-    "tags": [
-      "2.0.51"
-    ]
-  },
-  "2.0.52": {
-    "sha256": "be8d6216890089890693d6d94f141f745d35c53e52c6b942f6c944f5c00c8c26",
-    "tags": [
-      "2.0.52"
-    ]
-  },
-  "2.0.53": {
-    "sha256": "40a57076f80dbee0238dab62f16585def06f7d7e5b41f6b677be41b4d2cae811",
-    "tags": [
-      "2.0.53"
-    ]
-  },
-  "2.0.54": {
-    "sha256": "ad47c541b70763552bcf597202ee84aaac727d0ba158873134dc163a3a0506f0",
-    "tags": [
-      "2.0.54"
-    ]
-  },
   "2.0.55": {
     "sha256": "ef12a54d1556ae1f84ff99edc23706d13b7ad41f1c02d74ca1dfadf9448fcbae",
     "tags": [
+      "stable",
       "stable-2.0.55",
       "2",
       "2.0",
-      "2.0.55",
+      "2.0.55"
-      "stable"
     ]
   },
-  "2.0.57": {
+  "2.0.60": {
-    "sha256": "22b232afb77067c68a3afe087be6a0ee760479262598a12a709e1b03ea9508a6",
+    "sha256": "69b5be1a867fd99524f9914dfee900a1ac386cf4e74c4a63768c05dc4d2b2b0b",
-    "tags": [
-      "2.0.57"
-    ]
-  },
-  "2.0.58": {
-    "sha256": "be82e1aeba4169420e1b00c12a3e00ec2309a41327f9d6c335feec27bbc885e6",
     "tags": [
       "latest",
-      "2.0.58"
+      "2.0.60"
     ]
   }
 }

docker/Dockerfile

@@ -43,7 +43,7 @@ ENV PORT=34197 \
 SHELL ["/bin/bash", "-eo", "pipefail", "-c"]
 
 RUN apt-get -q update \
-    && DEBIAN_FRONTEND=noninteractive apt-get -qy install ca-certificates curl jq pwgen xz-utils procps gettext-base --no-install-recommends \
+    && DEBIAN_FRONTEND=noninteractive apt-get -qy install ca-certificates curl jq pwgen xz-utils procps gettext-base file --no-install-recommends \
     && if [[ "$(uname -m)" == "aarch64" ]]; then \
         echo "installing ARM compatability layer" \
         && DEBIAN_FRONTEND=noninteractive apt-get -qy install unzip --no-install-recommends \ 

docker/files/update-mods.sh

@@ -23,24 +23,33 @@ print_failure()
   echo "$1"
 }
 
-# Checks game version vs version in mod.
+# Checks if the current game version satisfies the mod's minimum required version.
-# Returns 0 if major version differs or mod minor version is less than game version, 1 if ok
+# Returns 1 if the game version is compatible with the mod, 0 if not
 check_game_version() {
-  local game_version="$1"
+  local mod_required_version="$1"  # The minimum Factorio version required by the mod
-  local mod_version="$2"
+  local current_game_version="$2"  # The current Factorio version
 
-  local game_major mod_major game_minor mod_minor
+  local mod_major mod_minor game_major game_minor
-  game_major=$(echo "$game_version" | cut -d '.' -f1)
+  mod_major=$(echo "$mod_required_version" | cut -d '.' -f1)
-  game_minor=$(echo "$game_version" | cut -d '.' -f2)
+  mod_minor=$(echo "$mod_required_version" | cut -d '.' -f2)
-  mod_major=$(echo "$mod_version" | cut -d '.' -f1)
+  game_major=$(echo "$current_game_version" | cut -d '.' -f1)
-  mod_minor=$(echo "$mod_version" | cut -d '.' -f2)
+  game_minor=$(echo "$current_game_version" | cut -d '.' -f2)
 
-  if [[ "$game_major" -ne "$mod_major" ]]; then
+  # If game major version is greater than mod's required major version, it's compatible
+  if [[ "$game_major" -gt "$mod_major" ]]; then
+    echo 1
+    return
+  fi
+
+  # If game major version is less than mod's required major version, it's not compatible
+  if [[ "$game_major" -lt "$mod_major" ]]; then
     echo 0
     return
   fi
 
-  if [[ "$mod_minor" -ge "$game_minor" ]]; then
+  # Major versions are equal, check minor versions
+  # Game minor version must be >= mod's required minor version
+  if [[ "$game_minor" -ge "$mod_minor" ]]; then
     echo 1
   else
     echo 0
@@ -79,7 +88,7 @@ check_dependency_version()
       fi
       ;;
     ">")
-      if [[ "$(printf '%s\n%s\n' "$required_version" "$mod_version" | sort -V | head -n1)" == "$required_version" && "$required_version" != "$FACTORIO_VERSION" ]]; then
+      if [[ "$(printf '%s\n%s\n' "$required_version" "$mod_version" | sort -V | head -n1)" == "$required_version" && "$required_version" != "$mod_version" ]]; then
         echo 1
       else
         echo 0
@@ -93,7 +102,7 @@ check_dependency_version()
       fi
       ;;
     "<")
-      if [[ "$(printf '%s\n%s\n' "$required_version" "$mod_version" | sort -V | tail -n1)" == "$required_version" && "$required_version" != "$FACTORIO_VERSION" ]]; then
+      if [[ "$(printf '%s\n%s\n' "$required_version" "$mod_version" | sort -V | tail -n1)" == "$required_version" && "$required_version" != "$mod_version" ]]; then
         echo 1
       else
         echo 0
@@ -116,11 +125,15 @@ get_mod_info()
 {
   local mod_info_json="$1"
 
+  # Process mod releases from newest to oldest, looking for a compatible version
   while IFS= read -r mod_release_info; do
     local mod_version mod_factorio_version
     mod_version=$(echo "$mod_release_info" | jq -r ".version")
     mod_factorio_version=$(echo "$mod_release_info" | jq -r ".info_json.factorio_version")
 
+    # Check if this mod version is compatible with our Factorio version
+    # This prevents downloading mods that require a newer Factorio version (fixes #468)
+    # and ensures backward compatibility (e.g., Factorio 2.0 can use 1.x mods) (fixes #517)
     if [[ $(check_game_version "$mod_factorio_version" "$FACTORIO_VERSION") == 0 ]]; then
       echo "  Skipping mod version $mod_version because of factorio version mismatch"  >&2
       continue
@@ -214,9 +227,12 @@ update_mod()
   return 0
 }
 
+# Process all enabled mods from mod-list.json, but skip built-in mods
+# The Space Age DLC includes built-in mods (elevated-rails, quality, space-age) that should not be downloaded
 if [[ -f $MOD_DIR/mod-list.json ]]; then
   jq -r ".mods|map(select(.enabled))|.[].name" "$MOD_DIR/mod-list.json" | while read -r mod; do
-    if [[ $mod != base ]]; then
+    # Skip base mod and DLC built-in mods
+    if [[ $mod != base ]] && [[ $mod != elevated-rails ]] && [[ $mod != quality ]] && [[ $mod != space-age ]]; then
       update_mod "$mod" || true
     fi
   done

update.sh

@@ -59,41 +59,40 @@ latestCurrentVersionShort=$latestCurrentVersionMajor.$latestCurrentVersionMinor
 echo "stableOnlineVersionShort=${stableOnlineVersionShort} experimentalOnlineVersionShort=${experimentalOnlineVersionShort}"
 echo "stableCurrentVersionShort=${stableCurrentVersionShort} latestCurrentVersionShort=${latestCurrentVersionShort}"
 
+# Create new buildinfo.json with only current versions
 tmpfile=$(mktemp)
 
-# Remove stable tag
+# Start with empty JSON object
-cp buildinfo.json "$tmpfile"
+echo '{}' > "$tmpfile"
-jq --arg stable_current_version "$stable_current_version" 'with_entries(if .key == $stable_current_version then .value.tags |= . - ["stable"] else . end)' "$tmpfile" > buildinfo.json
-rm -f -- "$tmpfile"
 
-# Remove latest tag
+# Add stable version
-cp buildinfo.json "$tmpfile"
+if [[ "$stable_online_version" == "$experimental_online_version" ]]; then
-jq --arg latest_current_version "$latest_current_version" 'with_entries(if .key == $latest_current_version then .value.tags |= . - ["latest"] else . end)' "$tmpfile" > buildinfo.json
+    # Stable and experimental are the same version
-rm -f -- "$tmpfile"
+    jq --arg stable_online_version "$stable_online_version" --arg sha256 "$stable_sha256" --arg stableOnlineVersionShort "$stableOnlineVersionShort" --arg stableOnlineVersionMajor "$stableOnlineVersionMajor" \
-
+        '. + {($stable_online_version): {sha256: $sha256, tags: ["latest", "stable", ("stable-" + $stable_online_version), $stableOnlineVersionMajor, $stableOnlineVersionShort, $stable_online_version]}}' "$tmpfile" > buildinfo.json
-# Update tag by stable
-cp buildinfo.json "$tmpfile"
-if [[ "$stable_online_version" == "$stable_current_version" ]]; then
-    jq --arg stable_current_version "$stable_current_version" --arg stable_online_version "$stable_online_version" --arg sha256 "$stable_sha256" 'with_entries(if .key == $stable_current_version then .key |= $stable_online_version | .value.sha256 |= $sha256 | .value.tags |= . - [$stable_current_version] + [$stable_online_version, "stable"] else . end)' "$tmpfile" > buildinfo.json
 else
-    jq --arg stable_current_version "$stable_current_version" --arg stable_online_version "$stable_online_version" --arg sha256 "$stable_sha256" --arg stableOnlineVersionShort "$stableOnlineVersionShort" --arg stableOnlineVersionMajor "$stableOnlineVersionMajor" 'with_entries(if .key == $stable_current_version then .value.tags |= . - ["latest","stable",$stableOnlineVersionMajor] else . end) | to_entries | . + [{ key: $stable_online_version, value: { sha256: $sha256, tags: ["latest","stable",("stable-" + $stable_online_version),$stableOnlineVersionMajor,$stableOnlineVersionShort,$stable_online_version]}}] | from_entries' "$tmpfile" > buildinfo.json
+    # Different stable and experimental versions
-fi
+    # First add stable
-rm -f -- "$tmpfile"
+    jq --arg stable_online_version "$stable_online_version" --arg sha256 "$stable_sha256" --arg stableOnlineVersionShort "$stableOnlineVersionShort" --arg stableOnlineVersionMajor "$stableOnlineVersionMajor" \
-
+        '. + {($stable_online_version): {sha256: $sha256, tags: ["stable", ("stable-" + $stable_online_version), $stableOnlineVersionMajor, $stableOnlineVersionShort, $stable_online_version]}}' "$tmpfile" > buildinfo.json.tmp
-# Update tag by latest
+    mv buildinfo.json.tmp "$tmpfile"
-cp buildinfo.json "$tmpfile"
+    
-if [[ $experimental_online_version != "$stable_online_version" ]]; then
+    # Then add experimental
     if [[ $stableOnlineVersionShort == "$experimentalOnlineVersionShort" ]]; then
-        jq --arg experimental_online_version "$experimental_online_version" --arg stable_online_version "$stable_online_version" --arg sha256 "$experimental_sha256" 'with_entries(if .key == $stable_online_version then .value.tags |= . - ["latest"] else . end) | to_entries | . + [{ key: $experimental_online_version, value: { sha256: $sha256, tags: ["latest", $experimental_online_version]}}] | from_entries' "$tmpfile" > buildinfo.json
+        jq --arg experimental_online_version "$experimental_online_version" --arg sha256 "$experimental_sha256" \
+            '. + {($experimental_online_version): {sha256: $sha256, tags: ["latest", $experimental_online_version]}}' "$tmpfile" > buildinfo.json
     else
-        jq --arg experimental_online_version "$experimental_online_version" --arg stable_online_version "$stable_online_version" --arg sha256 "$experimental_sha256" --arg experimentalOnlineVersionShort   "$experimentalOnlineVersionShort" --arg experimentalOnlineVersionMajor "$experimentalOnlineVersionMajor" 'with_entries(if .key == $stable_online_version then .value.tags |= . - ["latest"] else . end) | to_entries | . + [{ key: $experimental_online_version, value: { sha256: $sha256, tags: ["latest",$experimentalOnlineVersionMajor,$experimentalOnlineVersionShort,$experimental_online_version]}}] | from_entries' "$tmpfile" > buildinfo.json
+        jq --arg experimental_online_version "$experimental_online_version" --arg sha256 "$experimental_sha256" --arg experimentalOnlineVersionShort "$experimentalOnlineVersionShort" --arg experimentalOnlineVersionMajor "$experimentalOnlineVersionMajor" \
+            '. + {($experimental_online_version): {sha256: $sha256, tags: ["latest", $experimentalOnlineVersionMajor, $experimentalOnlineVersionShort, $experimental_online_version]}}' "$tmpfile" > buildinfo.json
     fi
 fi
+
 rm -f -- "$tmpfile"
 
 # Generate README tags with logical sorting and de-duplication
 # First, collect all unique tags with their versions
-declare -A tag_versions
+# Use regular arrays for bash compatibility
+declare tag_versions
 while IFS= read -r version; do
   while IFS= read -r tag; do
     # If this tag is already seen, compare versions to keep the latest