openSUSE:Create a patch file
Ideally, we can build packages without modifying upstream source code. However, to solve some build issues, patching source code is sometimes necessary. Follow these steps to create your patch!
Extract source code
Usually your will get source code in format of *.zip or *.tar.gz archive files. Let's say it is named "foobar-1.2.0.tar.gz". Extract it in your working directory, which you can do with context menu in most file managers. All extracted content should be in one sub-directory, like "foobar-1.2.0".
Make a copy
Copy and paste the directory "foobar-1.2.0" to the same directory with a different name "foobar-1.2.0-patched". The name doesn't really matter.
Modify source code
Go to "foobar-1.2.0-patched", and modify anything you want to change.
Generate the patch file
Go to the parent directory of "foobar-1.2.0" and "foobar-1.2.0-patched". Run:
diff -rub foobar-1.2.0 foobar-1.2.0-patched > you-name-it.patch