Format and label disks properly

lib/modules/partition.nix

@@ -129,8 +129,15 @@
                   (if keepExisting then fallback else create)
                   ''local diskPath="$(find -L /dev/disk/by-diskseq -samefile ${diskVar})"''
                   ''local ${partVarName}="$diskPath-part${toString index}"''
-                  formatScripts.${format}
-                  (labelScripts.${format} label)
+                  # Wait for partition to be detected
+                  ''
+                    while true;
+                    do
+                      [ -b ${partVar} ] && break;
+                    done;
+                  ''
+                  "sudo ${formatScripts.${format}}"
+                  "sudo ${labelScripts.${format} label}"
                 ])
               partitions)
           );