fix: populate chart source provenance for cached OCI charts

Addresses review feedback on ResolvedSource not being populated when
OCI charts are served from the local cache. Also adds a fallback for
direct oci:// references when --repo is not used.

- DownloadTo: populate ResolvedSource on cache-hit path
- DownloadToCache: populate ResolvedSource on cache-hit path
- LocateChart: add OCI ref fallback when RepoURL is empty

Signed-off-by: iammehrabsandhu <user.127.888@users.noreply.github.com>

pkg/action/install.go

@@ -991,6 +991,11 @@ func (c *ChartPathOptions) LocateChart(name string, settings *cli.EnvSettings) (
 	if c.resolvedSource == nil && c.RepoURL != "" {
 		c.resolvedSource = &rcommon.ChartSource{RepoURL: c.RepoURL}
 	}
+	// Fallback for direct OCI references (e.g. oci://registry.com/chart:tag)
+	// where RepoURL is empty and the downloader may not have populated it.
+	if c.resolvedSource == nil && registry.IsOCI(name) {
+		c.resolvedSource = &rcommon.ChartSource{RegistryRef: name}
+	}
 
 	lname, err := filepath.Abs(filename)
 	if err != nil {

pkg/downloader/chart_downloader.go

@@ -150,6 +150,15 @@ func (c *ChartDownloader) DownloadTo(ref, version, dest string) (string, *proven
 		}
 	}
 
+	// Populate source provenance for cached OCI charts.
+	// The ref and digest are already known from ResolveChartVersion.
+	if found && u.Scheme == registry.OCIScheme {
+		c.ResolvedSource = &rcommon.ChartSource{
+			RegistryRef: ref,
+			Digest:      hash,
+		}
+	}
+
 	if !found {
 		c.Options = append(c.Options, getter.WithAcceptHeader("application/gzip,application/octet-stream"))
 
@@ -266,6 +275,14 @@ func (c *ChartDownloader) DownloadToCache(ref, version string) (string, *provena
 		pth, err = c.Cache.Get(digest32, CacheChart)
 		if err == nil {
 			slog.Debug("found chart in cache", "id", digestString)
+
+			// Populate source provenance for cached OCI charts.
+			if u.Scheme == registry.OCIScheme {
+				c.ResolvedSource = &rcommon.ChartSource{
+					RegistryRef: ref,
+					Digest:      digestString,
+				}
+			}
 		}
 	}
 	if len(digest) == 0 || err != nil {