Small improvements with xorriso_broker.sh

frontend/xorriso_broker.sh

@@ -130,6 +130,7 @@ then
   # xorriso is not started yet
 
   # Check for xorriso version which knows command -named_pipe_loop
+  echo "Checking xorriso version ..." >&2
   xorriso_version_req="1.3.2"
   version=$("$xorriso" -version | grep '^xorriso version' |
             sed -e 's/^xorriso version   :  //')
@@ -144,8 +145,26 @@ then
     exit 2
   fi
 
-  mknod "$cmd_pipe" p
+  if mknod "$cmd_pipe" p
-  mknod "$result_pipe" p
+  then
+    echo "Created named pipe for xorriso commands: $cmd_pipe" >&2
+  else
+    echo "Failed to create named pipe for xorriso commands: $cmd_pipe" >&2
+    exit 3
+  fi
+  if mknod "$result_pipe" p
+  then
+    echo "Created named pipe for xorriso result channel: $result_pipe" >&2
+  else
+    echo \
+     "Failed to create named pipe for xorriso result channel: $result_pipe" >&2
+    if rm "$cmd_pipe"
+    then
+      echo "Removed named pipe for xorriso commands: $cmd_pipe" >&2
+    fi
+    exit 3
+  fi
+  echo "Starting xorriso process ..." >&2
   "$xorriso" -abort_on NEVER -for_backup \
              -named_pipe_loop cleanup:buffered "$cmd_pipe" "$result_pipe" "-" \
              >&2 &