Each time that WordPress inserts a blog into maintenance mode, it creates a file in the root of your installation directory.
the file contains a string related to the plugin/theme/core that is being updated. Its name is .maintenance (doesn’t have a name, only extension).
The file stays there until the process is over, therefore you can check if the file exists by doing this:
if( file_exists(ABSPATH .'/.maintenance') ) {
// Stop redirection here
}
Which would be what you are looking for.
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