extract common download

scripts/download.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+WGET_OPTS="--tries=5 --waitretry=5"
+
+function remove_file() {
+  if [ -f "$1" ]; then
+    rm -f "$1"
+  fi
+}
+
+function download_file() {
+  remove_file "$2"
+  if wget ${WGET_OPTS} "$1" -O "$2"; then
+    return 0
+  fi
+
+  remove_file "$2"
+  return 1
+}