#!/hint/bash -euE
# Copyright (C) 2023  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

post_install+=(99:reproducible:late)
reproducible:late() {
	local arg_mountpoint=$1

	local SOURCE_DATE_EPOCH
	# Set it to the last timestamp from any package any package.
	SOURCE_DATE_EPOCH=$(zcat "$arg_mountpoint"/var/lib/pacman/local/*/mtree |
				    sed -n 's/.* time=//p' | cut -d' ' -f1 |
				    cut -d. -f1 |
				    sort -n | tail -n1)

	for file in "$arg_mountpoint"/var/lib/pacman/local/*/desc; do
		awk -v date="$SOURCE_DATE_EPOCH" '
			BEGIN{x=0}
			$0 == "%INSTALLDATE%"{x=2}
			{if (x==1) { print date } else { print }; x--}
		' <"$file" >"$file.tmp"
		mv -T -- "$file.tmp" "$file"
	done

	rm -f -- "$arg_mountpoint"/var/log/pacman.log
	rm -f -- "$arg_mountpoint"/etc/machine-id               # systemd's pacman post-install script
	rm -f -- "$arg_mountpoint"/etc/ssl/certs/java/cacerts   # libalpm/hooks/40-update-ca-trust.hook
	rm -f -- "$arg_mountpoint"/var/cache/ldconfig/aux-cache # glibc's pacman post-install script

	# Add 1 second so that post-install things can be
	# "after" extracted files.
	SOURCE_DATE_EPOCH=$((SOURCE_DATE_EPOCH+1))
	touch --date="@$SOURCE_DATE_EPOCH" -- "$arg_mountpoint/.source_date_epoch"
	find "$arg_mountpoint" -xdev -depth \
	     -newer "$arg_mountpoint/.source_date_epoch" \
	     -exec touch --no-dereference --date="@$SOURCE_DATE_EPOCH" -- {} +
	rm -f -- "$arg_mountpoint/.source_date_epoch"
	touch --date="@$SOURCE_DATE_EPOCH" -- "$arg_mountpoint/"

}