libnetwork: repository.get_SRPMS_name: cache file list to reduce network traffic

lib/libnetwork.lib.in

@@ -221,10 +221,11 @@ getting list of files from"" \`${NOTE}$currurl/${NORM}'..."
             continue ;;
       esac
 
-      currflist="$(mktemp -q -p /var/tmp -t flist.XXXXXXXX)" ||
-         notify.error $"can't create temporary files"
+      currflist="/var/tmp/autospec_flist_$(echo "$currurl" | sed 's/[^a-zA-Z0-9._-]/_/g')"
       notify.debug "$FUNCNAME: currflist = $currflist"
 
+      # Cache flist file for 10 minutes to reduce network traffic
+      if [ ! -e "$currflist" ] || find $currflist -mmin +10 | grep -q .; then
          # NOTE: the trailing slash is necessary, do not remove it
          notify.debug "$FUNCNAME: curl $curlopts_debug --url $currurl/ -o $currflist"
          curl $curlopts --url $currurl/ -o $currflist
@@ -243,6 +244,10 @@ getting list of files from"" \`${NOTE}$currurl/${NORM}'..."
            *) notify.warning $"curl error (exit code: $retval)"
               let "errors += 1" ;;
          esac
+      else
+         notify.debug "$FUNCNAME: using cached flist file $currflist"
+         flist[$i]="$currflist"
+      fi
 
       [ -s "$currflist" ] || notify.warning $"cannot get the list of files"
 
@@ -281,11 +286,6 @@ $FUNCNAME: got_SPEC_FILENAME = ${got_SPEC_FILENAME[*]}"
       done
    done
 
-   for i in ${!flist[@]}; do
-      notify.debug "$FUNCNAME: removing temporary file '${flist[$i]}'"
-      rm -f ${flist[$i]}
-   done
-
    return 0
 }