- Closes#884.
## Type of Change
- [ ] Bug fix
- [x] New feature
- [ ] Breaking change
- [ ] Documentation update
## Motivation and Context
This PR implements the `container system df` command to display disk
usage statistics for images, containers, and volumes, along with their
total count, active count, size, and reclaimable space for each resource
type.
Active resources are determined by container mount references and
running state, while reclaimable space is calculated from inactive or
stopped resources.
Example output:
```
~/container ❯ container system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 4 3 4.42 GB 516.5 MB (11%)
Containers 4 2 2.69 GB 1.51 GB (56%)
Local Volumes 3 2 208.5 MB 66.2 MB (32%)
```
I'll have some follow-on PRs that will add `-v/--verbose` flag for
detailed per-resource information, `--filter` flag for filtering output
by resource type, and a `--debug` flag for debug statistics like block
usage, clone counts etc.
## Testing
- [x] Tested locally
- [x] Added/updated tests
- [ ] Added/updated docs
Define a `UnpackStrategy` function type in the `SnapshotStore` to give
more control over how an image is unpacked.
Previously, we were creating a 512 GB sparse block file for the initial
file system of a container, which is overkill.
With this change, the vminit image is unpacked to a smaller block file,
while container images are unpacked to the 512 GB block
Follows the same pattern as
https://github.com/apple/container/blob/main/Sources/Helpers/RuntimeLinux/RuntimeLinuxHelper.swift#L71
Signed-off-by: Aditya Ramani <a_ramani@apple.com>
Raj