/etc/vmbuilder/debian/is-compat-env.tmpl is in python-vm-builder 0.12.4+bzr494-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # this is read by ec2-is-compat-env to determine if this is an
# ec2 compatible environment
compat=1
|