These days virt-builder can read the simplestreams format, which IIUC is suppose to allow virt-builder to read the metadata that Ubuntu already posts. Probably best to talk to Pino Toscano about this since he added the support.
https://github.com/libguestfs/libguestfs/commit/b024aef6fb2d7219782c6cd00e6c703e161f839d
These days virt-builder can read the simplestreams format, which IIUC is suppose to allow virt-builder to read the metadata that Ubuntu already posts. Probably best to talk to Pino Toscano about this since he added the support.
https:/ /github. com/libguestfs/ libguestfs/ commit/ b024aef6fb2d721 9782c6cd00e6c70 3e161f839d