Creating Magisk modules and implementing SELinux rules can be a challenging endeavor, especially when encountering errors like 'Unable to find preinit dir'. This guide aims to help you troubleshoot this issue, drawing on common causes and potential solutions based on the provided information.
Let's break down the context:
* **The Goal:** You're developing a Magisk module to grant your FM radio app access to the /dev/fm module via SELinux rule modifications.
* **The Error:** During module installation via `magisk --install-module`, you receive the 'Unable to find preinit dir' warning. This suggests that Magisk cannot locate the necessary pre-initialisation directory for your module.
* **Possible Causes:**
1. **Incomplete Module Structure:** Your module might be missing the required directories and files for proper Magisk integration. The 'preinit' directory and its associated script are crucial for pre-applying SELinux rules.
2. **Incorrect Path:** The path specified for your preinit script within your module's `module.prop` file could be incorrect.
3. **Magisk Version:** While less common, there might be compatibility issues between the Magisk version you're using and your module's implementation.
* **Troubleshooting Steps:**
1. **Examine Module Structure:** Carefully review the structure of your module, ensuring the presence of the `preinit` directory and its associated script named `init.sh`.
2. **Verify Path in `module.prop`:** Double-check the `module.prop` file within your module. Make sure the path to your `init.sh` script is accurate.
3. **Update Magisk:** Consider updating Magisk to the latest stable version.
4. **Check for Typos:** Scrutinize your `init.sh` script for potential typos in paths, commands, or SELinux rule syntax.
5. **Debug Log Analysis:** Carefully examine the provided Magisk log (`magisk_log_2024-12-28T14.21.35.log`) for any additional clues or error messages related to module loading or SELinux policy application.
Remember to provide detailed information about your module structure, Magisk version, and any specific errors you encounter when seeking help on forums like XDA Developers.
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