Add spec_cksources() to verify Sources: in spec files

Handy when working with Python module spec files which tend to use
GitHub or PyPi links.

dotfiles/config/bashum/main.bashrc

     printf '\a'
 }
 
+spec_cksources() {
+    #
+    # Check Source?: URL's in RPM spec file $1
+    #
+    local file=$1
+    local hdr
+    local url
+    rpmspec -P "$file" \
+      | grep -E 'Source[0-9]+: *http' \
+      | while read -r hdr url; do
+            echo -n "$hdr: $url .."
+            curl -fsSL -I "$url" >/dev/null || {
+                echo fail
+                return 1
+            }
+            echo ok
+        done
+}
+
 nn() {
     #
     # Ring the bell and send notification $1 after $2 time