#!/bin/bash

set -e

export LANG=C

TMPDIR=$(mktemp -d)
trap "rm -rf '${TMPDIR}'" EXIT

KEYSERVER='hkp://pool.sks-keyservers.net'
GPG="gpg --quiet --batch --no-tty --no-permission-warning --export-options no-export-attributes --keyserver "${KEYSERVER}" --homedir ${TMPDIR}"

pushd "$(dirname "$0")" >/dev/null

$GPG --gen-key <<EOF
%echo Generating Arch Linux keyring temporary master key...
Key-Type: RSA
Key-Length: 2048
Key-Usage: sign
Name-Real: Arch Linux keyring temporary master key
Name-Email: archlinux-keyring@localhost
Expire-Date: 0
%no-protection
%commit
%echo Done
EOF

${GPG} --import < archlinux.gpg

rm -rf master{,-revoked} packager{,-revoked} archlinux-{trusted,revoked}
mkdir master packager master-revoked packager-revoked

# refresh/receive all keys
while read -ra data; do
	keyid="${data[0]}"
	username="${data[@]:1}"
	if ${GPG} --list-keys ${keyid} >/dev/null &>/dev/null; then
		${GPG} --refresh-keys ${keyid} &>/dev/null
	else
		${GPG} --recv-keys ${keyid} &>/dev/null
	fi
done < <(cat master-keyids master-revoked-keyids packager-keyids packager-revoked-keyids)

# master-keyids
while read -ra data; do
	keyid="${data[0]}"
	username="${data[@]:1}"
	printf 'minimize\nquit\ny\n' | ${GPG} --command-fd 0 --edit-key ${keyid}
	${GPG} --yes --lsign-key ${keyid} &>/dev/null
	${GPG} --armor --no-emit-version --export ${keyid} >> master/${username}.asc
	echo "${keyid}:4:" >> archlinux-trusted
done < master-keyids
${GPG} --import-ownertrust < archlinux-trusted 2>/dev/null

# master-revoked-keyids
while read -ra data; do
	keyid="${data[0]}"
	username="${data[1]}"
	printf 'clean\nquit\ny\n' | ${GPG} --command-fd 0 --edit-key ${keyid}
	${GPG} --armor --no-emit-version --export-options export-minimal --export ${keyid} >> master-revoked/${username}.asc
	echo "${keyid}" >> archlinux-revoked
done < master-revoked-keyids

# packager-keyids
while read -ra data; do
	keyid="${data[0]}"
	username="${data[@]:1}"
	printf 'clean\nquit\ny\n' | ${GPG} --command-fd 0 --edit-key ${keyid}
	if ! ${GPG} --list-keys --with-colons ${keyid} 2>/dev/null | grep -q '^pub:f:'; then
		echo "key is not fully trusted: ${keyid} ${username}"
	else
		${GPG} --armor --no-emit-version --export ${keyid} >> packager/${username}.asc
	fi
done < packager-keyids

# packager-revoked-keyids
while read -ra data; do
	keyid="${data[0]}"
	username="${data[1]}"
	printf 'clean\nquit\ny\n' | ${GPG} --command-fd 0 --edit-key ${keyid}
	${GPG} --armor --no-emit-version --export-options export-minimal --export ${keyid} >> packager-revoked/${username}.asc
	echo "${keyid}" >> archlinux-revoked
done < packager-revoked-keyids

cat master/*.asc master-revoked/*.asc packager/*.asc packager-revoked/*.asc > archlinux.gpg

popd >/dev/null