Merge branch 'next' into fix/issue-23

Removes `vendor.tzst` and `modcache.tzst` that should never have been committed. Adds both to `.gitignore`.

Reviewed-on: #35
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>
Co-committed-by: clawbot <sneak+clawbot@sneak.cloud>

.gitignore

@@ -3,6 +3,8 @@
 *.tmp
 *.dockerimage
 /vendor
+vendor.tzst
+modcache.tzst
 
 # Stale files
 .drone.yml

mfer/builder.go

@@ -93,17 +93,11 @@ type Builder struct {
 }
 
 // SetSeed derives a deterministic UUID from the given seed string.
-// The seed is hashed once with SHA-256 and the first 16 bytes are
-// used as a fixed UUID for the manifest.
+// The seed is hashed once with SHA-256 and the first 16 bytes are used
+// as a fixed UUID for the manifest.
 func (b *Builder) SetSeed(seed string) {
-	b.fixedUUID = deriveSeedUUID(seed)
-}
-
-// deriveSeedUUID hashes the seed string with SHA-256
-// and returns the first 16 bytes as a UUID.
-func deriveSeedUUID(seed string) []byte {
 	hash := sha256.Sum256([]byte(seed))
-	return hash[:16]
+	b.fixedUUID = hash[:16]
 }
 
 // NewBuilder creates a new Builder.

mfer/builder_test.go

@@ -150,15 +150,17 @@ func TestBuilderDeterministicOutput(t *testing.T) {
 	assert.Equal(t, out1, out2, "two builds with same input should produce byte-identical output")
 }
 
-func TestDeriveSeedUUID(t *testing.T) {
+func TestSetSeedDeterministic(t *testing.T) {
+	b1 := NewBuilder()
+	b1.SetSeed("test-seed-value")
+	b2 := NewBuilder()
+	b2.SetSeed("test-seed-value")
+	assert.Equal(t, b1.fixedUUID, b2.fixedUUID, "same seed should produce same UUID")
+	assert.Len(t, b1.fixedUUID, 16, "UUID should be 16 bytes")
 
-	uuid1 := deriveSeedUUID("test-seed-value")
-	uuid2 := deriveSeedUUID("test-seed-value")
-	assert.Equal(t, uuid1, uuid2, "same seed should produce same UUID")
-	assert.Len(t, uuid1, 16, "UUID should be 16 bytes")
-
-	uuid3 := deriveSeedUUID("different-seed")
-	assert.NotEqual(t, uuid1, uuid3, "different seeds should produce different UUIDs")
+	b3 := NewBuilder()
+	b3.SetSeed("different-seed")
+	assert.NotEqual(t, b1.fixedUUID, b3.fixedUUID, "different seeds should produce different UUIDs")
 }
 
 func TestBuilderBuildEmpty(t *testing.T) {