#!/bin/bash
# SPDX-License-Identifier: Apache-2.0
# Build one govpp-snmp-agentx .deb for one architecture.
# Usage: build-deb.sh <package> <amd64|arm64> <version>
#
# The version is also baked into the binary at link time (see Makefile
# LDFLAGS), so `govpp-snmp-agentx --version` is the source of truth for
# "which build". The .deb itself only carries the release version.
set -euo pipefail

PACKAGE="${1:?usage: build-deb.sh <package> <amd64|arm64> <version>}"
ARCH="${2:?usage: build-deb.sh <package> <amd64|arm64> <version>}"
VERSION="${3:?usage: build-deb.sh <package> <amd64|arm64> <version>}"

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
PKG="${PACKAGE}_${VERSION}_${ARCH}"
STAGING="$(mktemp -d)"
trap 'rm -rf "$STAGING"' EXIT

echo "Building ${PKG}.deb"

install -d "$STAGING/DEBIAN"
install -d "$STAGING/usr/sbin"
install -d "$STAGING/usr/share/man/man1"
install -d "$STAGING/lib/systemd/system"
install -d "$STAGING/etc/default"

install -m 755 "$REPO_ROOT/build/${ARCH}/${PACKAGE}"     "$STAGING/usr/sbin/${PACKAGE}"
install -m 644 "$REPO_ROOT/${PACKAGE}.service"           "$STAGING/lib/systemd/system/${PACKAGE}.service"
install -m 644 "$REPO_ROOT/${PACKAGE}.default"           "$STAGING/etc/default/${PACKAGE}"
gzip -9 -c "$REPO_ROOT/docs/${PACKAGE}.1"              > "$STAGING/usr/share/man/man1/${PACKAGE}.1.gz"

sed "s/@VERSION@/${VERSION}/;s/@ARCH@/${ARCH}/" \
    "$REPO_ROOT/debian/${PACKAGE}.control.in" > "$STAGING/DEBIAN/control"
install -m 644 "$REPO_ROOT/debian/${PACKAGE}.conffiles" "$STAGING/DEBIAN/conffiles"
install -m 755 "$REPO_ROOT/debian/${PACKAGE}.postinst"  "$STAGING/DEBIAN/postinst"
install -m 755 "$REPO_ROOT/debian/${PACKAGE}.prerm"     "$STAGING/DEBIAN/prerm"

mkdir -p "$REPO_ROOT/build"
OUT="$REPO_ROOT/build/${PKG}.deb"
dpkg-deb --build --root-owner-group "$STAGING" "$OUT"
echo "Built: $OUT"