/usr/share/initramfs-tools/hooks/copymods is in cloud-initramfs-copymods 0.27ubuntu1.
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 | #!/bin/sh
set -e
prereqs() {
local o="/scripts/init-bottom/overlayroot" p=""
for p in "$DESTDIR/" ""; do
[ -e "$p$o" ] && echo "overlayroot" && return 0
done
}
[ "$1" = "prereqs" ] && { prereqs; exit; }
. /usr/share/initramfs-tools/hook-functions
# vi: ts=4 noexpandtab
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