packitpatch

#!/usr/bin/bash

# Copyright Contributors to the Packit project.
# SPDX-License-Identifier: MIT

# do set -x for development/debugging
set -eu

# this will print a path to a git repo
# correct repo is /path/BUILD/<TOP-LEVEL-DIR-IN-ARCHIVE>
top_level_git_path=$(git rev-parse --show-toplevel)
second_to_last_dir=$(basename $(dirname ${top_level_git_path}))
# we cannot override %__scm_setup_patch b/c it is called from %autosetup
# and some specs have %setup + %autopatch, so we need to make sure
# the git repo exists here
if [ $second_to_last_dir != "BUILD" ]; then
  git init
  # we are doing -f to bypass .gitignore which can mask packit.yaml or the specfile
  # https://github.com/packit/dist-git-to-source-git/issues/66#issuecomment-694284493
  git add -f .
  # that PWD magic prints the name of the PWD, which usually is NAME-VERSION
  git commit -q --allow-empty -a -m "${PWD##*/} base"
fi

if [ "$1" == "%{1}" ]; then
  # rpm pipes the patch here
  # also, Michal Domonkos is a genius
  patch_path=$(readlink -f /dev/stdin)
else
  patch_path=$1
fi
patch_name=$(basename $patch_path)
patch_id=$2

# we process first and second arg above, the rest is for patch
# and we don't want backup files in our source-git repos
patch_args=$(echo ${@:3} | sed -e 's/ -b//' -e 's/--backup//')

cat - | /usr/bin/patch ${patch_args}

commit_message=$(cat << EOF
Apply patch ${patch_name}

patch_name: ${patch_name}
present_in_specfile: true
EOF
)

# when patches are applied with -p0, we need to strip the prefix
# in packit when creating the patch files
if echo ${@:3} | grep -E "[-]p0|[-]p 0"; then
  commit_message=$(cat << EOF
$commit_message
no_prefix: true
EOF
)
fi

if [ "$patch_id" != "%{2}" ]; then
  # concat 2 strings and separate them with \n - a nightmare to do in bash
  printf -v commit_message "${commit_message}\nlocation_in_specfile: ${patch_id}"
fi

git add -f .
# patches can be empty, rpmbuild is fine with it
git commit -m "$commit_message" --allow-empty