Last revised: July 10, 2016

Patch How-To

The purpose of this document is to show you what a patch is and how you can create, apply, download, and submit a patch.

A patch is an update to the source code of a program (here Eggdrop). Be careful, every patch is designed for a special Eggdrop version and cannot be applied on every bot!

Applying a patch

To apply a patch to an Eggdrop, you have to first obtain the Eggdrop source code. You should always keep a tar.gz archive with the source of your current Eggdrop on your shell. In the next step, you have to change to your source directory (i.e.: /home/user/eggdrop-1.9.1/) and type the following command:

patch -p1 < ../

Once this is complete, execute the following command:

find . -name “*.rej” -print

If it returns a list with filenames ending with .rej extension, then the patch didn’t apply properly. Ensure that the patch is intended for your version and that you have the original source. You should also try to re-download the patch to ensure that the patch is not corrupted.

If you get an error such as this:

|RCS file: /usr/local/cvsroot/eggdrop1.8/,v
|retrieving revision 1.38
|diff -u -r1.38
|---    17 Jun 2004 05:43:28 -0000      1.38
|+++    23 Jul 2004 21:58:23 -0000
File to patch:

Then you should try using a different ‘-p’ option. Try -p0 first, and then -p2, -p3, etc.

If the patch applied properly, the only thing left to do is to recompile your Eggdrop and install the new modules and binaries.

Creating and submitting a patch (via GitHub - preferred!)

If you fixed a bug and/or changed something in Eggdrop’s source code, it would be really nice to let the dev team know about it, so we can possibly apply it to next release of Eggdrop.

To create a patch via github:

  1. Fork the eggdrop git repo by logging in to your GitHub account and clicking the fork button at the top of the screen. Follow the directions it provides to configure your local repo.

  2. Enter the local directory and create a new branch for your patch:

    git checkout -b <DescriptiveBranchName>
  3. Make your changes

  4. Once you confirm your patch works, push the changes back to your GitHub repo - this is usually done by something similar to:

    git push origin <DescriptiveBranchName>
  5. Create a pull request by clicking on the “Pull Request” button on your GitHub page. Select the appropriate branches (usually eggheads/eggdrop/develop and yourUserName/eggdrop/YourBranchName)

  6. Fill in the Pull Request template and submit

  7. Pour yourself a cold one and bask in the warm feeling of contributing to the open source community! Karma++!

Creating and submitting a patch (via diff - old school!)

To create a patch using the diff tool:

  1. Create a directory with original source tree and one with modified source tree.

  2. Run the following:

    diff -urN eggdrop1.8.original eggdrop1.8.modified > patchname.patch

    DO NOT add any other diff options.

  3. Send an e-mail to with the patch attached. The body should contain a detailed description of what you changed and why you changed it. Don’t forget to include the Eggdrop version for which your patch was created.

    It helps if you include the major release number that the patch is for in the subject line. For the 1.8.x series, the subject line should look like this:

    PATCH1.8: my-patch-filename.patch

    You should also include the nick/handle, name, and email address you would like used for attribution in the Changes1.9 and THANKS files.

Never modify src/version.h or one of the Changes files. We will do it. If your patch includes changes related to autotools (./configure, etc), do NOT run autoconf, autoheader, etc; we will do this as well.

Also, please don’t add credit lines all over the source when patching. Patch contributors will receive credit in Changes1.9 and THANKS.

Patches submitted this way for Eggdrop 1.9.x can be found at the following location:

Copyright (C) 1999 - 2021 Eggheads Development Team