Trying to add NixOS to my Fedora grub

Question about adding NixOS to the GRUB menu on a Fedora system. Integrating multiple Linux distributions into GRUB can be a bit tricky but is certainly possible. Here are some general steps to add NixOS to your Fedora GRUB menu:


1. **Generate NixOS Configuration**:

   - Ensure that you have a working NixOS configuration. If you don't already have one, you'll need to create a NixOS configuration file (`configuration.nix`) that includes the necessary settings for your NixOS installation, including the kernel, bootloader, and boot loader options.


2. **Rebuild NixOS Configuration**:

   - After modifying your NixOS configuration, you need to rebuild it to generate a new system configuration. Run the following command in your NixOS terminal:


     ```bash

     sudo nixos-rebuild switch

     ```


3. **Locate the NixOS Kernel Image**:

   - You'll need to find the NixOS kernel image, typically located in `/nix/store`. Identify the path to the kernel image and remember it for the next steps.


4. **Edit Fedora GRUB Configuration**:

   - Open the GRUB configuration file on your Fedora system. This file is usually located at `/etc/grub.d/40_custom` or `/etc/grub.d/41_custom`.


5. **Add NixOS Menu Entry**:

   - Within the GRUB configuration file, add an entry for NixOS. You can use a text editor to open the file, and then add an entry like the following:


     ```bash

     menuentry "NixOS" {

       set root=(hd0,X)

       linux /path/to/nixos-kernel root=/dev/sdY

     }

     ```


     Replace `(hd0,X)` with the appropriate device for your NixOS installation, and `/path/to/nixos-kernel` with the path you identified in step 3. Make sure to replace `sdY` with the appropriate device for the NixOS root partition.


6. **Update GRUB Configuration**:

   - After making the changes, you need to update your GRUB configuration to include the new NixOS entry. Run the following command:


     ```bash

     sudo update-grub

     ```


7. **Reboot**:

   - Reboot your computer. You should now see a GRUB menu with an option to boot into NixOS.


Keep in mind that this is a high-level overview, and the specific paths and device names may vary depending on your system's configuration. Additionally, you should be careful when editing configuration files and ensure you have a backup or recovery plan in case anything goes wrong during the process.

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