/usr/lib/zfs-linux/zpool.d/upath is in zfsutils-linux 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
if [ "$1" = "-h" ] ; then
echo "Show the underlying path for a device."
exit
fi
echo upath="$VDEV_UPATH"
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