This file is indexed.

/bin/fetch-url is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

. /usr/share/debconf/confmodule

TRY_CONTINUE=
TRY_REPEAT=
while true; do
	case "$1" in
	    -c)
		TRY_CONTINUE=1
		shift
		;;
	    -r)
		TRY_REPEAT=1
		shift
		;;
	    -*)
		echo "$0: unrecognized or invalid option $1" >&2
		exit 1
		;;
	    *)
		break
		;;
	esac
done

url="$1"
dst="$2"

proto=${url%%://*}

. /usr/lib/fetch-url/$proto

protocol_fetch "$url" "$dst"