This file is indexed.

/usr/share/fish/functions/hostname.fish is in fish-common 2.4.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Query for USERDOMAIN to shorten waiting times when OS isn't Windows.
set -q USERDOMAIN
and switch (uname)
case 'CYGWIN_*'
	# Cygwin's hostname is broken when computer name contains Unicode
	# characters. This hack "fixes" hostname in Cygwin.
	function hostname --description "Show or set the system's host name"
		echo $USERDOMAIN
	end
end