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WIP: Use podman pull to fetch containers #215

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WIP: Use podman pull to fetch containers #215

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Commits on Jul 2, 2024

  1. Split out a hostexec module 

    We'll use this even in cases where we don't have the `install`
feature.

Signed-off-by: Colin Walters <walters@verbum.org>
    @cgwalters @jeckersb
    cgwalters authored and jeckersb committed Jul 2, 2024
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  2. WIP: Use podman pull to fetch containers 

    See containers#147 (comment)

With this bootc starts to really gain support for a different backend
than ostree.  Here we basically just fork off `podman pull` to
fetch container images into an *alternative root* in
`/ostree/container-storage`,
(Because otherwise basic things like `podman image prune` would
 delete the OS image)

This is quite distinct from our use of `skopeo` in the ostree-ext project
because suddenly now we gain support for things
implemented in the containers/storage library like `zstd:chunked` and
OCI crypt.

*However*...today we still need to generate a final flattened
filesystem tree (and an ostree commit) in order to maintain
compatibilty with stuff in rpm-ostree.  (A corrollary to this is
we're not booting into a `podman mount` overlayfs stack)
Related to this, we also need to handle SELinux labeling.

Hence, we implement "layer squashing", and then do some final
"postprocessing" on the resulting image matching the same logic
that's done in ostree-ext such as `etc -> usr/etc` and handling `/var`.

Note this also really wants
ostreedev/ostree#3106
to avoid duplicating disk space.

Signed-off-by: Colin Walters <walters@verbum.org>
    @cgwalters @jeckersb
    cgwalters authored and jeckersb committed Jul 2, 2024
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  3. Use authfile from ostree_ext 

    Signed-off-by: John Eckersberg <jeckersb@redhat.com>
    @jeckersb
    jeckersb committed Jul 2, 2024
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  4. WIP async propagation for podman image inspection

    @jeckersb
    jeckersb committed Jul 2, 2024
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  5. Handle bootc backend in origin file 

    Signed-off-by: John Eckersberg <jeckersb@redhat.com>
    @jeckersb
    jeckersb committed Jul 2, 2024
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