#!/bin/sh
set -eu

case "${1:-}" in
    "") sign_option="" ;;
    --unsigned) sign_option="--no-sign" ;;
    *)
        echo "usage: $0 [--unsigned]" >&2
        exit 2
        ;;
esac

upstream_commit=26191d396d74d505541d6311f0b4ae68d791b890
upstream_sha256=d5d8c8464f9cb24b0897c03edfe7d7c9e75ff5a91fe9b5b48791781aa9642858
upstream_url="https://gitlab.freedesktop.org/libinput/libinput/-/archive/$upstream_commit/libinput-$upstream_commit.tar.gz"

project_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
output_dir=$(dirname -- "$project_root")
package_name=$(dpkg-parsechangelog -l"$project_root/debian/changelog" -S Source)
full_version=$(dpkg-parsechangelog -l"$project_root/debian/changelog" -S Version)
file_version=${full_version#*:}
upstream_version=${file_version%%-*}
source_name="$package_name-$upstream_version"
build_root=$(mktemp -d)

cleanup() {
    rm -rf -- "$build_root"
}
trap cleanup EXIT HUP INT TERM

source_dir="$build_root/$source_name"
file_manifest="$build_root/files"
mkdir -p -- "$source_dir"

cd "$project_root"
git ls-files -z > "$file_manifest"
git ls-files --others --exclude-standard -z >> "$file_manifest"
tar --null --exclude='rpmbuild' --exclude='rpmbuild/*' \
    --exclude='rpmbuild2' --exclude='rpmbuild2/*' \
    --files-from="$file_manifest" \
    --create --file="$build_root/source.tar"
tar --extract --file="$build_root/source.tar" --directory="$source_dir"

vendor_dir="$build_root/vendor"
cd "$source_dir"
cargo vendor --offline --locked "$vendor_dir" >/dev/null
rm -rf -- "$source_dir/vendor"
mv -- "$vendor_dir" "$source_dir/vendor"

upstream_archive="$build_root/libinput-$upstream_commit.tar.gz"
curl --fail --location --retry 3 --retry-all-errors \
    --output "$upstream_archive" "$upstream_url"
echo "$upstream_sha256  $upstream_archive" | sha256sum -c -
mkdir -p -- "$source_dir/upstream/libinput-tools"
tar --extract --gzip --file="$upstream_archive" --strip-components=1 \
    --directory="$source_dir/upstream/libinput-tools"

cd "$project_root"
source_date_epoch=$(git log -1 --format=%ct)
orig_archive="$build_root/${package_name}_${upstream_version}.orig.tar.xz"
tar --sort=name --mtime="@$source_date_epoch" --owner=0 --group=0 \
    --numeric-owner --exclude="$source_name/debian" \
    --create --xz --file="$orig_archive" \
    --directory="$build_root" "$source_name"

cd "$source_dir"
if [ -n "$sign_option" ]; then
    dpkg-buildpackage --build=source -sa -d "$sign_option"
else
    dpkg-buildpackage --build=source -sa -d
fi

install -m 0644 "$orig_archive" "$output_dir/"
install -m 0644 "$build_root/${package_name}_${file_version}.debian.tar.xz" "$output_dir/"
install -m 0644 "$build_root/${package_name}_${file_version}.dsc" "$output_dir/"
install -m 0644 "$build_root/${package_name}_${file_version}_source.buildinfo" "$output_dir/"
install -m 0644 "$build_root/${package_name}_${file_version}_source.changes" "$output_dir/"

echo "Source package written to $output_dir"