containerd-to-vm - build firecracker VM from a docker file

	Commit message (Collapse)	Author	Files	Lines
2021-04-22	extract layers to a mounted loop device	Franck Cuny	1	-0/+6
	We create a loop device by pre-allocating space to a file on disk. This file is then converted to an ext4 partition, which we mount to a temporary path on the host. Once this is done, we extract all the layers from the given container on that mounted path. We also add a few extra files to the image (`/etc/hosts` and `/etc/resolv.conf`). When we're done extracting and writing, we run resize2fs in order to resize the image to a more reasonable size.
2021-04-13	pull a container into a namespace	Franck Cuny	1	-0/+897
	Pull an image provided as an argument to the program. We're only interested in images for Linux/amd64 at the moment. We setup a default namespace for containerd named `c2vm`. Images that will be pulled by containerd will be stored inside that namespace. Once the program is build it can be run like this: ``` ; sudo ./c2vm -container docker.io/library/redis:latest pulled docker.io/library/redis:latest (38667897 bytes) ``` And the image is indeed in the namespace: ``` ; sudo ctr -n c2vm images ls -q docker.io/library/redis:latest ```