How to create a Magento 2 Patch?

Let’s say you want to apply a patch from a third-party module installed via composer for a controller. Please make sure that you have this part in the composer.json file:

"extra": {
    "magento-force": true,
    "composer-exit-on-patch-failure": true,
    "patches": {
        "vendorname/module-somerandomname": {
            "Description here": "patches/my_patch_name.patch"

Assuming that your vendor folder is in the .gitignore file, you can still do:

git add -f vendor/vendor/module/Controller/Myfile.php

Apply your changes to the Myfile.php

Now run the following commands below.

git diff vendor/vendor/module/Controller/Myfile.php > patches/my_patch_name.patch
git reset HEAD vendor/vendor/module/Controller/Myfile.php

Now run the command composer install

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