In function container_bootstrap, DISTRO_NAME and DISTRO_RELEASE are derived from DISTRO_FULL.
Then R, the directory where the machine is cached, depends on DISTRO_FULL.

If R doesn't exist, a machine is debootstrap-ed in there, and the /etc/hosts file is filled with the NAME of that first machine.

Example : machinespawn bootstrap "ubuntu-22.10" "ubuntu-butterfly" "amd64" will create a machine in /var/cache/machinespawn/bootstrap/ubuntu-22.10-amd64 and write 127.0.0.1 localhost ubuntu-butterfly to /var/cache/machinespawn/bootstrap/ubuntu-22.10-amd64/etc/hosts.

But because R doesn't depend on the machine's name, it is not possible to create a correct second container based on ubuntu-22.10.

Example: machinespawn bootstrap "ubuntu-22.10" "butterfly-builder" "amd64" will not create the machine in /var/cache/machinespawn/bootstrap/ubuntu-22.10-amd64 because the directory already exists. The machine is then correctly imported with the name butterfly-builder but its /etc/hosts file contains 127.0.0.1 localhost ubuntu-butterfly and not 127.0.0.1 localhost butterfly-builder