Function query_image_commit

crates/ostree-ext/src/container/store.rs:1739–1778

Query metadata for a pulled image via an OSTree commit digest. The digest must refer to a pulled container image's merge commit.

(repo: &ostree::Repo, commit: &str)

/// Query metadata for a pulled image via an OSTree commit digest.
/// The digest must refer to a pulled container image's merge commit.
pub fn query_image_commit(repo: &ostree::Repo, commit: &str) -> Result<Box<LayeredImageState>> {
    let merge_commit = commit.to_string();
    let merge_commit_obj = repo.load_commit(commit)?.0;
    let commit_meta = &merge_commit_obj.child_value(0);
    let commit_meta = &ostree::glib::VariantDict::new(Some(commit_meta));
    let (manifest, manifest_digest) = manifest_data_from_commitmeta(commit_meta)?;
    let configuration = image_config_from_commitmeta(commit_meta)?;
    let mut layers = manifest.layers().iter().cloned();
    // We require a base layer.
    let base_layer = layers.next().ok_or_else(|| anyhow!("No layers found"))?;
    let base_layer = query_layer(repo, base_layer)?;
    let ostree_ref = base_layer.ostree_ref.as_str();
    let base_commit = base_layer
        .commit
        .ok_or_else(|| anyhow!("Missing base image ref {ostree_ref}"))?;

    let detached_commitmeta =
        repo.read_commit_detached_metadata(&merge_commit, gio::Cancellable::NONE)?;
    let detached_commitmeta = detached_commitmeta
        .as_ref()
        .map(|v| glib::VariantDict::new(Some(v)));
    let cached_update = detached_commitmeta
        .as_ref()
        .map(parse_cached_update)
        .transpose()?
        .flatten();
    let state = Box::new(LayeredImageState {
        base_commit,
        merge_commit,
        manifest_digest,
        manifest,
        configuration,
        cached_update,
        // we can't cross-reference with a remote here
        verify_text: None,
        filtered_files: None,
    });
    tracing::debug!("Wrote merge commit {}", state.merge_commit);
    Ok(state)
}

fn manifest_for_image(repo: &ostree::Repo, imgref: &ImageReference) -> Result<ImageManifest> {
    let ostree_ref = ref_for_image(imgref)?;