#!/bin/sh
# Copyright (C) 2026 Mark Robillard Jr (MARKMENTAL)
# SPDX-License-Identifier: GPL-3.0-or-later
#
# post-build.sh - stamp the Mentalnet root filesystem with a build id
#
# Invoked by Buildroot (BR2_ROOTFS_POST_BUILD_SCRIPT) with the target
# directory as first argument. The same stamp is recorded in
# output/images/.mn-build-stamp so post-image.sh can name the ISO
# after the exact build that is inside it.
#
# The stamp is visible inside the guest:
#   - /etc/os-release  -> BUILD_ID="YYYYMMDD-HHMMSS"
#   - /etc/issue       -> shown above the login prompt

set -e

TARGET_DIR="${1}"
#STAMP="$(date +%Y%m%d-%H%M%S)"
RELEASE="R1"
CODENAME="StreamingHeart"
STAMP="${RELEASE} ${CODENAME}"        # pretty form: R1 ${CODENAME}
STAMP_SAFE="${RELEASE}-${CODENAME}"       # sanitized:  R1-GhostRule
IMAGES_DIR="$(dirname "${TARGET_DIR}")/images"

# record the stamp for post-image.sh
mkdir -p "${IMAGES_DIR}"
echo "${STAMP_SAFE}" > "${IMAGES_DIR}/.mn-build-stamp"

# /etc/os-release (regular file lives at /usr/lib/os-release; /etc/os-release
# is a symlink to it) - Mentalnet branding, Buildroot defaults dropped
OS_RELEASE="${TARGET_DIR}/usr/lib/os-release"
cat > "${OS_RELEASE}" <<EOF
NAME="Mentalnet GNU/Linux"
VERSION="${STAMP}"
ID=mentalnet
VERSION_ID="${RELEASE}"
PRETTY_NAME="Mentalnet GNU/Linux ${STAMP}"
BUILD_ID="${STAMP_SAFE}"
EOF

# login banner
ISSUE="${TARGET_DIR}/etc/issue"
sed -i '/^Mentalnet GNU\/Linux build /d' "${ISSUE}"
printf 'Mentalnet GNU/Linux build %s\n' "${STAMP}" >> "${ISSUE}"