/usr/share/initramfs-tools/hooks/growroot is in cloud-initramfs-growroot 0.25ubuntu1.
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 8 9 10 11 12 13 14 15 16 | #!/bin/sh
set -e
PREREQS=""
case $1 in
prereqs) echo "${PREREQS}"; exit 0;;
esac
. /usr/share/initramfs-tools/hook-functions
##
copy_exec /sbin/sfdisk /sbin
copy_exec /usr/bin/growpart /sbin
copy_exec /sbin/udevadm /sbin
# vi: ts=4 noexpandtab
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