Preserve unmanaged download_state commands

Author: herr-seppia

node-installer.sh

@@ -257,7 +257,11 @@ ln -sf /opt/dusk/bin/ruskquery /usr/bin/ruskquery
 ln -sf /opt/dusk/bin/ruskreset /usr/bin/ruskreset
 ln -sf /opt/dusk/bin/rusk-wallet /usr/bin/rusk-wallet
 if [[ "$NETWORK" == "devnet" ]]; then
-    rm -f /usr/bin/download_state
+    if [[ -L /usr/bin/download_state && "$(readlink /usr/bin/download_state)" == "/opt/dusk/bin/download_state.sh" ]]; then
+        rm -f /usr/bin/download_state
+    elif [[ -e /usr/bin/download_state ]]; then
+        echo "Leaving unmanaged /usr/bin/download_state in place; devnet fast sync is not available."
+    fi
 fi
 if [[ "$NETWORK" == "mainnet" || "$NETWORK" == "testnet" ]]; then
     ln -sf /opt/dusk/bin/download_state.sh /usr/bin/download_state