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Once we will be ready to boot our VM, we will need an init script in
place. For this, we create a simple shell script which we populate using
the environment variables and command extracted from the container.
The init script is stored in /init.sh within the new image, and we will
configure the boot parameter to find it there.
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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.
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This will ensure that our container will not be deleted while we work on
it. In addition, a default expiry of 24 hours will be set on it once the
lease is released (once the program is completed).
See [1] for more details.
[1] https://github.com/containerd/containerd/blob/261c107ffc4ff681bc73988f64e3f60c32233b37/docs/garbage-collection.md
Signed-off-by: Franck Cuny <franck@fcuny.net>
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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
```
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