Add mapping of cubby to sled ID to support bundles

Currently support bundles contain the sled UUID in file paths, and
serial number in `sled.txt`. However, when accessing the sled via the
tech port we generally refer to a sled by its cubby.

To make identification of sleds simpler, add a new `sled_info.json` file
to the bundle with a JSON-encoded mapping of sled serial to cubby and
UUID.

Author: wfchandler

Cargo.lock

@@ -37,6 +37,7 @@ dropshot.workspace = true
 fatfs.workspace = true
 futures.workspace = true
 gateway-client.workspace = true
+gateway-types.workspace = true
 headers.workspace = true
 hex.workspace = true
 hickory-resolver.workspace = true

nexus/Cargo.toml

@@ -20,9 +20,11 @@ use futures::stream::FuturesUnordered;
 use gateway_client::Client as MgsClient;
 use gateway_client::types::SpIdentifier;
 use gateway_client::types::SpIgnition;
+use gateway_types::component::SpType;
 use internal_dns_resolver::Resolver;
 use internal_dns_types::names::ServiceName;
 use nexus_db_model::Ereport;
+use nexus_db_model::Sled;
 use nexus_db_model::SupportBundle;
 use nexus_db_model::SupportBundleState;
 use nexus_db_queries::authz;
@@ -47,9 +49,11 @@ use omicron_uuid_kinds::SledUuid;
 use omicron_uuid_kinds::SupportBundleUuid;
 use omicron_uuid_kinds::ZpoolUuid;
 use parallel_task_set::ParallelTaskSet;
+use serde::Serialize;
 use serde_json::json;
 use sha2::{Digest, Sha256};
 use slog_error_chain::InlineErrorChain;
+use std::collections::BTreeMap;
 use std::future::Future;
 use std::io::Write;
 use std::num::NonZeroU64;
@@ -61,6 +65,7 @@ use tokio::io::AsyncWriteExt;
 use tokio::io::SeekFrom;
 use tokio_util::task::AbortOnDropHandle;
 use tufaceous_artifact::ArtifactHash;
+use uuid::Uuid;
 use zip::ZipArchive;
 use zip::ZipWriter;
 use zip::write::FullFileOptions;
@@ -707,23 +712,44 @@ impl BundleCollection {
             None
         };
 
-        let sp_dumps_dir = dir.path().join("sp_task_dumps");
-        tokio::fs::create_dir_all(&sp_dumps_dir).await.with_context(|| {
-            format!("failed to create SP task dump directory {sp_dumps_dir}")
-        })?;
-        if let Err(e) =
-            save_all_sp_dumps(log, &self.resolver, &sp_dumps_dir).await
-        {
-            error!(log, "failed to capture SP task dumps"; "error" => InlineErrorChain::new(e.as_ref()));
-        } else {
-            report.listed_sps = true;
-        };
-
-        if let Ok(all_sleds) = self
+        let all_sleds = self
             .datastore
             .sled_list_all_batched(&self.opctx, SledFilter::InService)
+            .await;
+
+        if let Some(mgs_client) = self.create_mgs_client().await {
+            if let Err(e) = write_sled_info(
+                &self.log,
+                &mgs_client,
+                all_sleds.as_deref().ok(),
+                dir.path(),
+            )
             .await
-        {
+            {
+                error!(log, "Failed to write sled_info.json"; "error" => InlineErrorChain::new(e.as_ref()));
+            }
+
+            let sp_dumps_dir = dir.path().join("sp_task_dumps");
+            tokio::fs::create_dir_all(&sp_dumps_dir).await.with_context(
+                || {
+                    format!(
+                        "Failed to create SP task dump directory {sp_dumps_dir}"
+                    )
+                },
+            )?;
+
+            if let Err(e) =
+                save_all_sp_dumps(log, &mgs_client, &sp_dumps_dir).await
+            {
+                error!(log, "Failed to capture SP task dumps"; "error" => InlineErrorChain::new(e.as_ref()));
+            } else {
+                report.listed_sps = true;
+            };
+        } else {
+            warn!(log, "No MGS client, skipping SP task dump collection");
+        }
+
+        if let Ok(all_sleds) = all_sleds {
             report.listed_in_service_sleds = true;
 
             const MAX_CONCURRENT_SLED_REQUESTS: usize = 16;
@@ -1031,6 +1057,23 @@ impl BundleCollection {
         );
         Ok(())
     }
+
+    async fn create_mgs_client(&self) -> Option<MgsClient> {
+        match self
+            .resolver
+            .lookup_socket_v6(ServiceName::ManagementGatewayService)
+            .await
+            .map(|sockaddr| {
+                let url = format!("http://{}", sockaddr);
+                gateway_client::Client::new(&url, self.log.clone())
+            }) {
+            Ok(r) => Some(r),
+            Err(e) => {
+                error!(self.log, "failed to resolve MGS address"; "error" => InlineErrorChain::new(&e));
+                None
+            }
+        }
+    }
 }
 
 impl BackgroundTask for SupportBundleCollector {
@@ -1316,18 +1359,9 @@ where
 /// Collect task dumps from all SPs via MGS and save them to a directory.
 async fn save_all_sp_dumps(
     log: &slog::Logger,
-    resolver: &Resolver,
+    mgs_client: &MgsClient,
     sp_dumps_dir: &Utf8Path,
 ) -> anyhow::Result<()> {
-    let mgs_client = resolver
-        .lookup_socket_v6(ServiceName::ManagementGatewayService)
-        .await
-        .map(|sockaddr| {
-            let url = format!("http://{}", sockaddr);
-            gateway_client::Client::new(&url, log.clone())
-        })
-        .context("failed to resolve address of MGS")?;
-
     let available_sps = get_available_sps(&mgs_client).await?;
 
     let mut tasks = ParallelTaskSet::new();
@@ -1412,6 +1446,83 @@ async fn save_sp_dumps(
     Ok(())
 }
 
+/// Write a file with a JSON mapping of sled serial numbers to cubby and UUIDs for easier
+/// identification of sleds present in a bundle.
+async fn write_sled_info(
+    log: &slog::Logger,
+    mgs_client: &MgsClient,
+    nexus_sleds: Option<&[Sled]>,
+    dir: &Utf8Path,
+) -> anyhow::Result<()> {
+    #[derive(Serialize)]
+    struct SledInfo {
+        cubby: Option<u16>,
+        uuid: Option<Uuid>,
+    }
+
+    let available_sps = get_available_sps(&mgs_client)
+        .await
+        .context("failed to get available SPs")?;
+
+    // We can still get a useful mapping of cubby to serial using just the data from MGS.
+    let mut nexus_map: BTreeMap<_, _> = nexus_sleds
+        .unwrap_or_default()
+        .into_iter()
+        .map(|sled| (sled.serial_number(), sled))
+        .collect();
+
+    let mut sled_info = BTreeMap::new();
+    for sp in
+        available_sps.into_iter().filter(|sp| matches!(sp.type_, SpType::Sled))
+    {
+        let sp_state = match mgs_client.sp_get(&sp.type_, sp.slot).await {
+            Ok(s) => s.into_inner(),
+            Err(e) => {
+                error!(log,
+                    "Failed to get SP state for sled_info.json";
+                    "cubby" => sp.slot,
+                    "component" => %sp.type_,
+                    "error" => InlineErrorChain::new(&e)
+                );
+                continue;
+            }
+        };
+
+        if let Some(sled) = nexus_map.remove(sp_state.serial_number.as_str()) {
+            sled_info.insert(
+                sp_state.serial_number.to_string(),
+                SledInfo {
+                    cubby: Some(sp.slot),
+                    uuid: Some(*sled.identity.id.as_untyped_uuid()),
+                },
+            );
+        } else {
+            sled_info.insert(
+                sp_state.serial_number.to_string(),
+                SledInfo { cubby: Some(sp.slot), uuid: None },
+            );
+        }
+    }
+
+    // Sleds not returned by MGS.
+    for (serial, sled) in nexus_map {
+        sled_info.insert(
+            serial.to_string(),
+            SledInfo {
+                cubby: None,
+                uuid: Some(*sled.identity.id.as_untyped_uuid()),
+            },
+        );
+    }
+    let json_value = serde_json::to_value(sled_info)
+        .context("failed to serialize sled info to JSON")?;
+    let json_str = serde_json::to_string_pretty(&json_value)
+        .context("failed to pretty print sled info JSON")?;
+    tokio::fs::write(dir.join("sled_info.json"), json_str).await?;
+
+    Ok(())
+}
+
 fn is_fs_safe_single_path_component(s: &str) -> bool {
     // Might be path traversal...
     if s == "." || s == ".." {