Support cross Windows release packaging

scripts/package-release.sh

@@ -26,8 +26,16 @@ normalize_arch() {
   esac
 }
 
-os="$(normalize_os)"
-arch="$(normalize_arch)"
+host_os="$(normalize_os)"
+os="${DOSH_PACKAGE_OS:-$host_os}"
+arch="${DOSH_PACKAGE_ARCH:-$(normalize_arch)}"
+target="${DOSH_PACKAGE_TARGET:-}"
+if [ -z "$target" ] && [ "$os" = "windows" ] && [ "$host_os" != "windows" ]; then
+  case "$arch" in
+    x86_64) target="x86_64-pc-windows-gnu" ;;
+    *) echo "set DOSH_PACKAGE_TARGET for windows/$arch" >&2; exit 1 ;;
+  esac
+fi
 if [ "$os" = "windows" ]; then
   artifact="dosh-$os-$arch.zip"
   versioned_artifact="dosh-$version-$os-$arch.zip"
@@ -38,19 +46,33 @@ fi
 stage="$out_dir/stage/dosh"
 write_versioned="${DOSH_PACKAGE_VERSIONED:-0}"
 
-if [ "$os" = "windows" ]; then
-  cargo build --release --bin dosh-client --bin dosh-bench
+if [ -n "$target" ]; then
+  release_dir="target/$target/release"
 else
-  cargo build --release
+  release_dir="target/release"
+fi
+
+if [ "$os" = "windows" ]; then
+  if [ -n "$target" ]; then
+    cargo build --release --target "$target" --bin dosh-client --bin dosh-bench
+  else
+    cargo build --release --bin dosh-client --bin dosh-bench
+  fi
+else
+  if [ -n "$target" ]; then
+    cargo build --release --target "$target"
+  else
+    cargo build --release
+  fi
 fi
 
 rm -rf "$stage"
 mkdir -p "$stage/bin" "$out_dir"
 for bin in dosh-client dosh-server dosh-auth dosh-bench; do
-  if [ -f "target/release/$bin" ]; then
-    install -m 0755 "target/release/$bin" "$stage/bin/$bin"
-  elif [ -f "target/release/$bin.exe" ]; then
-    install -m 0755 "target/release/$bin.exe" "$stage/bin/$bin.exe"
+  if [ -f "$release_dir/$bin" ]; then
+    install -m 0755 "$release_dir/$bin" "$stage/bin/$bin"
+  elif [ -f "$release_dir/$bin.exe" ]; then
+    install -m 0755 "$release_dir/$bin.exe" "$stage/bin/$bin.exe"
   fi
 done
 if [ -f "$stage/bin/dosh-client.exe" ]; then