Carry the source fingerprint in the builds list, so builds can say it (issue 1208)

Issue 1204's line never showed: chainBuildList copied each build field by field and left the fingerprint out.

internal/inventory/builds_test.go

@@ -256,3 +256,33 @@ func TestAFailedNewerBuildLeavesTheBuildSourceStale(t *testing.T) {
 		t.Fatalf("after a newer failed build the proxy reads as %+v", got)
 	}
 }
+
+// novox/hq issue 1208: the list builds reads carries each build's source fingerprint, so the verb can say it.
+func TestTheBuildsListCarriesTheSourceFingerprint(t *testing.T) {
+	inv := fresh(t)
+	ctx := context.Background()
+	pinned := aBuild("1", "shell", "")
+	pinned.SourceFingerprint = "src1:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
+	if err := inv.RecordBuild(ctx, pinned); err != nil {
+		t.Fatal(err)
+	}
+	if err := inv.RecordBuild(ctx, aBuild("2", "other", "")); err != nil {
+		t.Fatal(err)
+	}
+	got, err := inv.Builds(ctx, "", 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	says := map[string]string{}
+	for _, b := range got {
+		says[b.Module] = b.SourceFingerprint
+	}
+	// 1208/AC1
+	if says["shell"] != pinned.SourceFingerprint {
+		t.Errorf("the list says %q for shell; want %q", says["shell"], pinned.SourceFingerprint)
+	}
+	// 1208/AC2
+	if fp, listed := says["other"]; !listed || fp != "" {
+		t.Errorf("a build with no fingerprint is listed with %q (listed %v); want it listed with none", fp, listed)
+	}
+}

internal/inventory/chain_builds.go

@@ -618,7 +618,9 @@ func (i *Inventory) chainBuildList(ctx context.Context, c *chain.Chain, module s
 	for _, b := range all {
 		if module == "" || b.Module == module {
 			out = append(out, Build{ID: b.ID, Repository: b.Repository, Ref: b.Ref, Module: b.Module, Commit: b.Commit,
-				On: b.On, Failed: b.Failed, Made: b.Made, Asked: b.Asked, At: b.At, ReuseKey: b.ReuseKey, Published: b.Published})
+				On: b.On, Failed: b.Failed, Made: b.Made, Asked: b.Asked, At: b.At, ReuseKey: b.ReuseKey, Published: b.Published,
+				// What it was made from, which builds says (novox/hq issue 1208).
+				SourceFingerprint: b.SourceFingerprint})
 		}
 	}
 	sort.SliceStable(out, func(a, b int) bool {