pull: Improved progress output

indicatif has nice support for multiple bars. Instead
of hand-rolling a `[nn/NN]` for the overall layer count,
change things so that we have:

```
Fetching layers [bar...] 8/65
 ostree chunk sha256:29fc11ff03e4b3 [bar] (0 B/s)
```

Signed-off-by: Colin Walters <walters@verbum.org>

lib/src/deploy.rs

@@ -13,7 +13,8 @@ use fn_error_context::context;
 use ostree::{gio, glib};
 use ostree_container::OstreeImageReference;
 use ostree_ext::container as ostree_container;
-use ostree_ext::container::store::PrepareResult;
+use ostree_ext::container::store::{ImportProgress, PrepareResult};
+use ostree_ext::oci_spec::image::Descriptor;
 use ostree_ext::ostree;
 use ostree_ext::ostree::Deployment;
 use ostree_ext::sysroot::SysrootLock;
@@ -112,34 +113,76 @@ pub(crate) fn check_bootc_label(config: &ostree_ext::oci_spec::image::ImageConfi
     }
 }
 
+fn descriptor_of_progress(p: &ImportProgress) -> &Descriptor {
+    match p {
+        ImportProgress::OstreeChunkStarted(l) => l,
+        ImportProgress::OstreeChunkCompleted(l) => l,
+        ImportProgress::DerivedLayerStarted(l) => l,
+        ImportProgress::DerivedLayerCompleted(l) => l,
+    }
+}
+
+fn prefix_of_progress(p: &ImportProgress) -> &'static str {
+    match p {
+        ImportProgress::OstreeChunkStarted(_) | ImportProgress::OstreeChunkCompleted(_) => {
+            "ostree chunk"
+        }
+        ImportProgress::DerivedLayerStarted(_) | ImportProgress::DerivedLayerCompleted(_) => {
+            "layer"
+        }
+    }
+}
+
 /// Write container fetch progress to standard output.
 async fn handle_layer_progress_print(
     mut layers: tokio::sync::mpsc::Receiver<ostree_container::store::ImportProgress>,
     mut layer_bytes: tokio::sync::watch::Receiver<Option<ostree_container::store::LayerProgress>>,
-    total_layers: usize,
-    n_layers_fetched: &mut usize,
+    n_layers_to_fetch: usize,
 ) {
-    let style = indicatif::ProgressStyle::default_bar();
-    let pb = indicatif::ProgressBar::new(100);
-    pb.set_style(
-        style
-            .template("{prefix} {bytes} [{bar:20}] ({eta}) {msg}")
+    let start = std::time::Instant::now();
+    let mut total_read = 0u64;
+    let bar = indicatif::MultiProgress::new();
+    let layers_bar = bar.add(indicatif::ProgressBar::new(
+        n_layers_to_fetch.try_into().unwrap(),
+    ));
+    let byte_bar = bar.add(indicatif::ProgressBar::new(0));
+    // let byte_bar = indicatif::ProgressBar::new(0);
+    // byte_bar.set_draw_target(indicatif::ProgressDrawTarget::hidden());
+    layers_bar.set_style(
+        indicatif::ProgressStyle::default_bar()
+            .template("{prefix} {bar} {pos}/{len} {wide_msg}")
             .unwrap(),
     );
+    layers_bar.set_prefix("Fetching layers");
+    layers_bar.set_message("");
+    byte_bar.set_prefix("Fetching");
+    byte_bar.set_style(
+        indicatif::ProgressStyle::default_bar()
+                .template(
+                    " └ {prefix} {bar} {binary_bytes}/{binary_total_bytes} ({binary_bytes_per_sec}) {wide_msg}",
+                )
+                .unwrap()
+        );
     loop {
         tokio::select! {
             // Always handle layer changes first.
             biased;
             layer = layers.recv() => {
                 if let Some(l) = layer {
+                    let layer = descriptor_of_progress(&l);
+                    let layer_size = u64::try_from(layer.size()).unwrap();
                     if l.is_starting() {
-                        pb.set_position(0);
+                        byte_bar.reset_elapsed();
+                        byte_bar.reset_eta();
+                        byte_bar.set_length(layer_size);
+                        let layer_type = prefix_of_progress(&l);
+                        let short_digest = &layer.digest()[0..21];
+                        byte_bar.set_message(format!("{layer_type} {short_digest}"));
                     } else {
-                        pb.finish();
-                        *n_layers_fetched += 1;
+                        byte_bar.set_position(layer_size);
+                        layers_bar.inc(1);
+                        total_read = total_read.saturating_add(layer_size);
                     }
-                    pb.set_prefix(format!("[{}/{}]", *n_layers_fetched, total_layers));
-                    pb.set_message(ostree_ext::cli::layer_progress_format(&l));
                 } else {
                     // If the receiver is disconnected, then we're done
                     break
@@ -152,13 +195,26 @@ async fn handle_layer_progress_print(
                 }
                 let bytes = layer_bytes.borrow();
                 if let Some(bytes) = &*bytes {
-                    pb.set_length(bytes.total);
-                    pb.set_position(bytes.fetched);
+                    byte_bar.set_position(bytes.fetched);
                 }
             }
-
         }
     }
+    byte_bar.finish_and_clear();
+    layers_bar.finish_and_clear();
+    if let Err(e) = bar.clear() {
+        tracing::warn!("clearing bar: {e}");
+    }
+    let end = std::time::Instant::now();
+    let elapsed = end.duration_since(start);
+    let persec = total_read as f64 / elapsed.as_secs_f64();
+    let persec = indicatif::HumanBytes(persec as u64);
+    println!(
+        "Fetched layers: {} in {} ({}/s)",
+        indicatif::HumanBytes(total_read),
+        indicatif::HumanDuration(elapsed),
+        persec,
+    );
 }
 
 /// Wrapper for pulling a container image, wiring up status output.
@@ -182,19 +238,14 @@ pub(crate) async fn pull(
         ostree_ext::cli::print_deprecated_warning(warning).await;
     }
     ostree_ext::cli::print_layer_status(&prep);
+    let layers_to_fetch = prep.layers_to_fetch().collect::<Result<Vec<_>>>()?;
+    let n_layers_to_fetch = layers_to_fetch.len();
     let printer = (!quiet).then(|| {
         let layer_progress = imp.request_progress();
         let layer_byte_progress = imp.request_layer_progress();
-        let total_layers = prep.layers_to_fetch().count();
-        let mut n_fetched = 0usize;
         tokio::task::spawn(async move {
-            handle_layer_progress_print(
-                layer_progress,
-                layer_byte_progress,
-                total_layers,
-                &mut n_fetched,
-            )
-            .await
+            handle_layer_progress_print(layer_progress, layer_byte_progress, n_layers_to_fetch)
+                .await
         })
     });
     let import = imp.import(prep).await;