Record the inputs of a build's source fingerprint in its build record (issue 1215)

internal/builder/source_sdk_test.go

@@ -1,6 +1,7 @@
 package builder
 
 import (
+	"encoding/json"
 	"testing"
 
 	"git.novox.be/novox/mesh-sdk/go/delivery"
@@ -81,3 +82,44 @@ func TestTheBuilderFingerprintsWithTheSDKFunction(t *testing.T) {
 		t.Errorf("the SDK function was given %+v", got)
 	}
 }
+
+// 1215/AC1: the inputs a result records, read back, give the fingerprint the build recorded (the live builds of
+// 1214/AC1), through encoding/json as the build record keeps them.
+func TestTheInputsAResultRecordsGiveItsFingerprintAgain(t *testing.T) {
+	s := &sourceInputs{module: "build-agent", tree: "11c0b4f90cae0d6e4ef9cc48cbfdf9f6dbe52bca",
+		bases: []string{
+			"sha256:d9e853e87e55526f6b2917df91a2115c36dd7c696a35be12163d44e6e2a4b6bc",
+			"sha256:8ac98ca534ac3f51e1f420a1dd2c15e74c75cfa0f23f3ad27eb5d7236c349a0c",
+		},
+		contexts: map[string]string{"server": "narrow:d51ca744fd11af59d616c858f76c27b3e58e16e11fbdc0c720eb9d7d19d55fac"}}
+	raw, err := json.Marshal(resultInputs(s))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var back delivery.SourceInputs
+	if err := json.Unmarshal(raw, &back); err != nil {
+		t.Fatal(err)
+	}
+	want := "src1:e846efe73716b78e80860baaac96153de2cb76551325753838ca245d2160a3d7"
+	if fp, none := delivery.SourceFingerprint(back); fp != want || none != "" {
+		t.Errorf("the inputs read back give %q (%q), want %q", fp, none, want)
+	}
+}
+
+// 1215/AC3: a build that gets no fingerprint still has its inputs recorded, so the reason is visible.
+func TestABuildWithNoFingerprintStillSaysItsInputs(t *testing.T) {
+	s := newSourceInputs("app")
+	s.tree = "aaaa"
+	s.notPinned("it resolves packages from the mesh's registry at build time")
+	in := resultInputs(s)
+	if in == nil || in.Module != "app" || in.Tree != "aaaa" || in.Unpinned == "" {
+		t.Fatalf("the inputs of an unpinned build: %+v", in)
+	}
+	if fp, none := delivery.SourceFingerprint(*in); fp != "" || none != in.Unpinned {
+		t.Errorf("the inputs give %q (%q)", fp, none)
+	}
+	noTree := resultInputs(newSourceInputs("app"))
+	if noTree == nil || noTree.Module != "app" || noTree.Tree != "" {
+		t.Errorf("the inputs of a build with no tree: %+v", noTree)
+	}
+}