Method view_manifest_from_pack

atomic-cli/src/commands/clone/command.rs:354–388

Fetch and validate one view's manifest from the remote. Returns `Ok(None)` if the remote does not have the view. Reconstruct one view's manifest from a pulled [`SyncPack`]: find its ref target, then its view-snapshot object, and render the manifest text. Returns `Ok(None)` when the pack carries no ref/snapshot for `view`. This replaces the per-object `get_view_ref` + `get_object("views", …)` rou

(
        &self,
        pack: &SyncPack,
        view: &str,
    )

    /// This replaces the per-object `get_view_ref` + `get_object("views", …)`
    /// round-trips: clone reads every view's state from the single `/code` pull.
    fn view_manifest_from_pack(
        &self,
        pack: &SyncPack,
        view: &str,
    ) -> CliResult<Option<ViewManifest>> {
        let target = match pack.refs.iter().find(|r| r.name == view) {
            Some(r) => r.new_target.clone(),
            None => return Ok(None),
        };
        let snapshot = pack
            .objects
            .iter()
            .find(|o| o.family == ObjectFamily::View && o.key == target)
            .and_then(|o| ViewSnapshot::from_bytes(&o.bytes));
        let snapshot = match snapshot {
            Some(s) => s,
            None => return Ok(None),
        };
        let manifest = parse_remote_manifest(view, &snapshot.to_manifest_text(view), &self.url)?;
        // O(1) producer-integrity cross-check: the snapshot's declared
        // `own_set_id` must equal the order-invariant fold of its own change
        // list (content addressing guarantees the bytes, not a self-consistent
        // producer).
        let mut fold = SetId::ZERO;
        for h in &manifest.changes {
            fold = fold.add(h);
        }
        if fold.to_base32() != snapshot.own_set_id {
            print_warning(&format!(
                "Remote view '{view}' snapshot set-id disagrees with its change list; \
                 the remote object may be inconsistent."
            ));
        }
        Ok(Some(manifest))
    }

    /// Verify convergence with the order-invariant `SetId`: each applied view's
    /// local **effective** set-id must equal the remote's, taken from the server