#!/usr/bin/env bash
# Build a release: everything needed to install Guix on the Raspberry Pi 4
# and the GL-MT6000, in release/guix-router-DATE-REV/:
#
#   guix-router-rpi4.img.zst            Pi SD-card / USB image
#   guix-router-mt6000-root.ext4.zst    MT6000 root file system (p7)
#   guix-router-mt6000-boot.itb         MT6000 boot image, FIT (p6)
#   install-mt6000.sh, flash-rpi.sh     installers
#   INSTALL.md                          how to install, log in, recover
#   SHA256SUMS, SHA256SUMS.uncompressed, SIZES.uncompressed, BUILD-INFO
#
#   ./build-release.sh [all|rpi|mt6000]
#
# Builds from the working tree (BUILD-INFO records the commit and whether it
# was dirty).  The images carry this tree's files/workstation.pub (SSH) and
# files/workstation-guix.pub (deploys) -- put your own keys there first.
set -euo pipefail
cd "$(dirname "$0")"
export PATH=$HOME/.local/bin:$PATH
export GUIX_PACKAGE_PATH="$PWD/packages:$HOME/channels/nonguix"

what=${1:-all}
case "$what" in all|rpi|mt6000) ;; *) sed -n '2,15p' "$0"; exit 1 ;; esac

rev=$(git describe --always --dirty)
out=release/guix-router-$(date +%Y%m%d)-$rev
mkdir -p "$out"
zstd=$(guix build zstd | grep -E -- '-zstd-[0-9][^-]*$')/bin/zstd
# (zstd copies the source's mode and time: store files are read-only, 1970.)
pack() { "$zstd" -T0 -12 --long=27 -q -f -o "$2" "$1"; chmod 644 "$2"; touch "$2"; }

uncompressed() {   # record checksum and size of an image before compression
	local name=$1 file=$2
	echo "$(sha256sum < "$file" | cut -c1-64)  $name" >> "$out/SHA256SUMS.uncompressed"
	echo "$(stat -L -c %s "$file") $name" >> "$out/SIZES.uncompressed"
}
rm -f "$out/SHA256SUMS.uncompressed" "$out/SIZES.uncompressed"

if [ "$what" != mt6000 ]; then
	echo "== Raspberry Pi 4 image"
	./build-rpi-image.sh
	uncompressed guix-router-rpi4.img guix-rpi4-claude.img
	pack guix-rpi4-claude.img "$out/guix-router-rpi4.img.zst"
	cp flash-rpi.sh "$out/"
fi

if [ "$what" != rpi ]; then
	echo "== GL-MT6000 root file system and boot image"
	./build-mt6000-root.sh
	uncompressed guix-router-mt6000-root.ext4 mt6000-root.ext4
	pack mt6000-root.ext4 "$out/guix-router-mt6000-root.ext4.zst"
	cp mt6000-boot.itb "$out/guix-router-mt6000-boot.itb"
	cp install-mt6000.sh "$out/"
fi

cp docs/INSTALL.md "$out/"
{
	echo "guix-router release $(basename "$out")"
	echo "commit: $(git rev-parse HEAD)$(git diff --quiet HEAD || echo ' (working tree had changes)')"
	echo "built: $(date -u +%FT%TZ) on $(hostname)"
	guix --version | head -1
} > "$out/BUILD-INFO"
(cd "$out" && sha256sum -- *.zst *.itb *.sh INSTALL.md 2>/dev/null > SHA256SUMS)
echo
echo "release: $PWD/$out"
ls -lh "$out"