fix: Propagate command substitution failures (#2039)

src/mido.sh

@@ -1022,15 +1022,19 @@ downloadFile() {
   local web_desc="$5"
   local connections="${6:-1}"
 
-  local domain dots
+  local domain parent
   local msg="Downloading $web_desc"
   local console_msg="Downloading $desc"
 
   # Keep mirror messages concise by reducing subdomains to the final two
   # labels, while Microsoft downloads retain the generic description.
-  domain=$(echo "$url" | awk -F/ '{print $3}')
-  dots=$(echo "$domain" | tr -cd '.' | wc -c)
-  (( dots > 1 )) && domain=$(expr "$domain" : '.*\.\(.*\..*\)')
+  domain="${url#*://}"
+  domain="${domain%%/*}"
+
+  if [[ "$domain" == *.*.* ]]; then
+    parent="${domain#*.}"
+    [ -n "$parent" ] && domain="$parent"
+  fi
 
   if [ -n "$domain" ] && [[ "${domain,,}" != *"microsoft.com" ]]; then
     console_msg="Downloading $desc from $domain"