patch.sh

#!/bin/bash

patches_dir="$(dirname "$(readlink -f "$0")")"
patched_dir="$(dirname "$patches_dir")/patched"
repos_dir="$(dirname "$patches_dir")/raw"
echo "Finding .patch files in '$patches_dir' to apply to repositories in '$repos_dir' with output in '$patched_dir' ..."

# loop over all .patch files in the patches directory
find "$patches_dir" -type f -name "*.patch" | while read -r patch_file; do

    # find the original repository path and apply the patch
    relative_path="$(dirname ${patch_file#$patches_dir/})"
    repo_path="$repos_dir/$relative_path"
    file_to_patch="$repo_path/$(basename ${patch_file%.patch})"
    git -C "$repo_path" apply "$patch_file"

    # copy the file to the patched directory and reverse the patch
    patched_path="$patched_dir/$relative_path"
    patched_file="$patched_path/$(basename ${patch_file%.patch})"
    mkdir -p "$patched_path"
    cp "$file_to_patch" "$patched_file"
    git -C "$repo_path" apply --reverse --whitespace=nowarn "$patch_file"
    echo "  Patched '$file_to_patch' and saved to '$patched_file'"
done