thunderbird_sequoia_installation.sh

#!/usr/bin/env bash

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
OCTOPUS_SRC_DIR="${SCRIPT_DIR}/sequoia-octopus-librnp"
OCTOPUS_REPO_URL="https://gitlab.com/sequoia-pgp/sequoia-octopus-librnp.git"

if [[ "${EUID}" -eq 0 ]]; then
	echo "Run this script as a regular user (it will use sudo when needed)."
	exit 1
fi

if [[ ! -r /etc/os-release ]]; then
	echo "Cannot detect OS: /etc/os-release not found."
	exit 1
fi

source /etc/os-release

if [[ "${ID:-}" != "pop" && "${ID_LIKE:-}" != *"ubuntu"* ]]; then
	echo "This script targets Pop!_OS / Ubuntu-based systems."
	echo "Detected: ID=${ID:-unknown} ID_LIKE=${ID_LIKE:-unknown}"
	exit 1
fi

if ! command -v sudo >/dev/null 2>&1; then
	echo "sudo is required."
	exit 1
fi

echo "==> Installing Thunderbird and build dependencies"
sudo apt-get update

NETTLE_DEV_PKG=""
if apt-cache show nettle-dev >/dev/null 2>&1; then
	NETTLE_DEV_PKG="nettle-dev"
elif apt-cache show libnettle-dev >/dev/null 2>&1; then
	NETTLE_DEV_PKG="libnettle-dev"
else
	echo "Could not find a Nettle development package (nettle-dev/libnettle-dev)."
	exit 1
fi

sudo apt-get install -y \
	thunderbird \
	cargo \
	clang \
	git \
	pkg-config \
	"${NETTLE_DEV_PKG}" \
	libssl-dev

if [[ ! -d "${OCTOPUS_SRC_DIR}" ]]; then
	echo "==> Octopus source directory not found: ${OCTOPUS_SRC_DIR}"
	echo "==> Cloning ${OCTOPUS_REPO_URL}"
	git clone "${OCTOPUS_REPO_URL}" "${OCTOPUS_SRC_DIR}"
fi

echo "==> Building sequoia-octopus-librnp from ${OCTOPUS_SRC_DIR}"
pushd "${OCTOPUS_SRC_DIR}" >/dev/null
cargo build --release
popd >/dev/null

OCTOPUS_LIB="${OCTOPUS_SRC_DIR}/target/release/libsequoia_octopus_librnp.so"
if [[ ! -f "${OCTOPUS_LIB}" ]]; then
	echo "Build succeeded, but library not found: ${OCTOPUS_LIB}"
	exit 1
fi

echo "==> Detecting Thunderbird distribution directory"
TB_DIR=""
for candidate in \
	/usr/lib/thunderbird \
	/usr/lib64/thunderbird \
	/opt/thunderbird
do
	if [[ -d "${candidate}" ]]; then
		TB_DIR="${candidate}"
		break
	fi
done

if [[ -z "${TB_DIR}" ]]; then
	echo "Thunderbird install directory not found."
	exit 1
fi

TB_LIBRNP="${TB_DIR}/librnp.so"
TB_LIBRNP_ORIG="${TB_DIR}/librnp-orig.so"
TB_OCTOPUS_LIB="${TB_DIR}/libsequoia_octopus_librnp.so"

echo "==> Installing Octopus library to ${TB_OCTOPUS_LIB}"
sudo install -m 0755 "${OCTOPUS_LIB}" "${TB_OCTOPUS_LIB}"

if ! dpkg-divert --list "${TB_LIBRNP}" | grep -q .; then
	echo "==> Diverting original librnp.so to ${TB_LIBRNP_ORIG}"
	sudo dpkg-divert --divert "${TB_LIBRNP_ORIG}" --rename "${TB_LIBRNP}"
else
	echo "==> Existing diversion found for ${TB_LIBRNP}"
fi

echo "==> Pointing Thunderbird to Octopus backend"
sudo ln -sfn "libsequoia_octopus_librnp.so" "${TB_LIBRNP}"

echo
echo "Installation finished."
echo "- Thunderbird installed via apt"
echo "- Octopus library installed at ${TB_OCTOPUS_LIB}"
echo "- ${TB_LIBRNP} now points to libsequoia_octopus_librnp.so"
echo "- Original Thunderbird library preserved at ${TB_LIBRNP_ORIG}"
echo
echo "Important: Thunderbird updates may overwrite this setup."
echo "If that happens, rerun this script."