multi-arch build script and version fixes (#435)

scripts/release-build.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+# Fail script on any error (do not change)
+set -e
+
+PROJECT_ROOT="$(dirname "$(dirname "$(realpath "$0")")")"
+cd "${PROJECT_ROOT}"
+
+# Make sure no one is sourcing the script, as we export variables
+if [[ "${BASH_SOURCE[0]}" != "$0" ]]; then
+	echo "Execute ${BASH_SOURCE[0]} instead of souring it"
+	exit 1
+fi
+
+version="HEAD" # use "latest" for most recent tagged release
+install_targets=(
+	"github.com/athanorlabs/atomic-swap/cmd/swapd@${version}"
+	"github.com/athanorlabs/atomic-swap/cmd/swapcli@${version}"
+	"github.com/athanorlabs/atomic-swap/cmd/bootnode@${version}"
+)
+
+# turn on echo
+set -x
+
+dest_dir=release-bin
+rm -rf "${dest_dir}"
+mkdir "${dest_dir}"
+
+# Note: We don't bother with static builds (larger binaries) as swapd depends on
+# a local monero-wallet-rpc binary and all releases of monero-wallet-rpc depend
+# on glibc.
+unset CGO_ENABLED
+
+# Unfortunately, GOBIN can't be set when doing cross platform builds and
+# go install doesn't take an -o flag:
+# https://github.com/golang/go/issues/57485
+# We are inside a go module project right now and we'll confuse tooling
+# if we put the GOPATH inside of the project. We are using "go install",
+# so nothing will go wrong even if a go.mod exists at the top of /tmp.
+build_dir="$(mktemp -d /tmp/release-build-XXXXXXXXXX)"
+
+for os in linux darwin; do
+	for arch in amd64 arm64; do
+		GOPATH="${build_dir}" GOOS="${os}" GOARCH="${arch}" \
+			go install -tags=prod "${install_targets[@]}"
+		from_dir="${build_dir}/bin/${os}_${arch}"
+		to_dir="${dest_dir}/${os/darwin/macos}-${arch/amd64/x64}"
+		if [[ -d "${from_dir}" ]]; then
+			# non-native binaries
+			mv "${from_dir}" "${to_dir}"
+		else
+			# native binaries
+			mkdir "${to_dir}"
+			mv "${build_dir}/bin/"* "${to_dir}"
+		fi
+	done
+done
+
+chmod -R u+w "${build_dir}"
+rm -rf "${build_dir}"