Magento: In case when you need to create a custom patch for any code which is in gitignore (for example modules in vendor/ directory)

magento_patch_files.md

1. cd <magento_root>
2. mkdir -p m2-hotfixes/tmp
3. Copy original files
   cp --parents <path/to/yout/file1> <path/to/yout/file2> ... m2-hotfixes/tmp
   OR
   rsync -R <path/to/yout/file1> <path/to/yout/file2> ... m2-hotfixes/tmp
4. cd m2-hotfixes/tmp
5. git init && git add . && git commit -m "Initial commit"
6. Make changes in files in m2-hotfixes/tmp directory
7. git add . && git commit -m "Fix something"
8. git format-patch -1 HEAD -o ..
   format-patch will generate .patch file in m2-hotfixes directory
9. cd <magento_root>
10. rm -rf m2-hotfixes/tmp
11. to apply all patches locally run the command
    vendor/bin/ece-tools patch