#!/usr/bin/env bash
# Rebuilds Arch's ffmpeg package from source so it links against the installed
# svt-av1-essential-git instead of the repo svt-av1 it was built with.
#
# Re-run this after a `pacman -Syu` that updates ffmpeg, otherwise the repo
# build replaces this one.
set -euo pipefail

if ! pacman -Qq svt-av1-essential-git >/dev/null 2>&1; then
    echo "svt-av1-essential-git is not installed; nothing to rebuild against." >&2
    exit 1
fi

build="$(mktemp -d)"
trap 'rm -rf "$build"' EXIT

git clone --depth 1 https://gitlab.archlinux.org/archlinux/packaging/packages/ffmpeg.git "$build/ffmpeg"
cd "$build/ffmpeg"

# The PKGBUILD verifies a signed ffmpeg tag; makepkg won't fetch the keys itself
mapfile -t keys < <(source ./PKGBUILD && printf '%s\n' "${validpgpkeys[@]}")
if (( ${#keys[@]} )); then
    gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys "${keys[@]}"
fi

# No --needed: the version matches what's installed, we want it replaced anyway
makepkg --syncdeps --install --cleanbuild --noconfirm