internal/depot/manifest.go

@@ -17,12 +17,10 @@ type manifestFile struct {
 	} `yaml:"assets"`
 }
 
+var sha256Pattern = regexp.MustCompile(`^[0-9a-f]{64}$`)
+
 func ValidSHA(s string) bool {
-	if len(s) != 64 {
-		return false
-	}
-	match, _ := regexp.MatchString("^[0-9a-f]{64}$", s)
-	return match
+	return sha256Pattern.MatchString(s)
 }
 
 func BlobKey(sha string) string {
@@ -42,7 +40,7 @@ func ReferencedSHAs(dir string) (map[string]int64, error) {
 		if entry.IsDir() {
 			continue
 		}
-		if !hasYAMLExt(entry.Name()) {
+		if filepath.Ext(entry.Name()) != ".yml" {
 			continue
 		}
 
@@ -60,7 +58,7 @@ func ReferencedSHAs(dir string) (map[string]int64, error) {
 
 		for _, asset := range manifest.Assets {
 			if !ValidSHA(asset.SHA256) {
-				return nil, fmt.Errorf("%s: invalid sha256 hash", entry.Name())
+				return nil, fmt.Errorf("%s: asset %q: invalid sha256 %q", entry.Name(), asset.Path, asset.SHA256)
 			}
 
 			// Keep the largest size for each sha
@@ -76,7 +74,3 @@ func ReferencedSHAs(dir string) (map[string]int64, error) {
 
 	return result, nil
 }
-
-func hasYAMLExt(name string) bool {
-	return filepath.Ext(name) == ".yml" || filepath.Ext(name) == ".yaml"
-}

internal/depot/manifest_test.go

@@ -111,10 +111,11 @@ func TestReferencedSHAs(t *testing.T) {
 
 	_, err = ReferencedSHAs(tmpdir)
 	if err == nil {
-		t.Errorf("ReferencedSHAs with bad sha: got nil error, want error naming file")
+		t.Fatalf("ReferencedSHAs with bad sha: got nil error, want error naming file and asset path")
 	}
-	if err != nil && err.Error() != "badsha.yml: invalid sha256 hash" {
-		t.Errorf("ReferencedSHAs error message: got %q, should mention badsha.yml", err.Error())
+	want := `badsha.yml: asset "file5.txt": invalid sha256 "not_a_valid_sha"`
+	if err.Error() != want {
+		t.Errorf("ReferencedSHAs error message: got %q, want %q", err.Error(), want)
 	}
 }