Add xsvm VM

scripts/build_xsvm.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if ! [[ "$0" =~ scripts/build_xsvm.sh ]]; then
+  echo "must be run from repository root"
+  exit 255
+fi
+
+source ./scripts/constants.sh
+
+PLUGIN_FILENAME="v3m4wPxaHpvGr8qfMeyK6PRW3idZrPHmYcMTt7oXdK47yurVH"
+
+# Set the PATHS
+GOPATH="$(go env GOPATH)"
+if [[ $# -eq 1 ]]; then
+    BINARY_DIRECTORY=$1
+elif [[ $# -eq 0 ]]; then
+    BINARY_DIRECTORY="${GOPATH}/src/github.com/ava-labs/avalanchego/build/plugins/${PLUGIN_FILENAME}"
+else
+    echo "Invalid arguments to build xsvm. Requires either no arguments (default) or one arguments to specify plugin location."
+    exit 1
+fi
+
+echo "Building xsvm plugin into ${BINARY_DIRECTORY}"
+go build -o "${BINARY_DIRECTORY}" ./vms/example/xsvm/cmd/xsvm/
+
+echo "Symlinking ${BINARY_DIRECTORY} to ./build/xsvm"
+ln -sf "${BINARY_DIRECTORY}" ./build/xsvm