Fossil

  /* If "islink"/"isLink" columns are missing from tables, then
  ** add them now.   This code added on 2011-01-17 and 2011-08-27.
  ** After all users have upgraded, this code can be safely deleted. 
  */
  if( !db_local_column_exists("vfile", "islink") )
    db_multi_exec("ALTER TABLE vfile ADD COLUMN islink BOOLEAN DEFAULT 0");
  
  if( db_local_table_exists("stashfile") && 
      !db_local_column_exists("stashfile", "isLink") )
  if( !db_local_column_exists("stashfile", "isLink") &&
       db_local_table_exists("stashfile") )
    db_multi_exec("ALTER TABLE stashfile ADD COLUMN isLink BOOLEAN DEFAULT 0");

  if( db_local_table_exists("undo") &&
      !db_local_column_exists("undo", "isLink") )
  if( !db_local_column_exists("undo", "isLink") &&
       db_local_table_exists("undo") )
    db_multi_exec("ALTER TABLE undo ADD COLUMN isLink BOOLEAN DEFAULT 0");
  
  if( db_local_table_exists("undo_vfile") && 
      !db_local_column_exists("undo_vfile", "islink") )
  if( !db_local_column_exists("undo_vfile", "islink") &&
       db_local_table_exists("undo_vfile") )
    db_multi_exec("ALTER TABLE undo_vfile ADD COLUMN islink BOOLEAN DEFAULT 0");

  return 1;
}

/*
** Locate the root directory of the local repository tree.  The root