Apply linter autofixes: internal/vaultik (refs #61)

internal/vaultik/blob_fetch.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"io"
 	"time"
@@ -26,9 +27,10 @@ type hashVerifyReader struct {
 
 func (h *hashVerifyReader) Read(p []byte) (int, error) {
 	n, err := h.reader.Read(p)
-	if err == io.EOF {
+	if errors.Is(err, io.EOF) {
 		h.done = true
 	}
+
 	return n, err
 }
 
@@ -41,6 +43,7 @@ func (h *hashVerifyReader) Close() error {
 		firstHash := h.reader.Sum256()
 		secondHasher := sha256.New()
 		secondHasher.Write(firstHash)
+
 		actualHashHex := hex.EncodeToString(secondHasher.Sum(nil))
 		if actualHashHex != h.blobHash {
 			return fmt.Errorf("blob hash mismatch: expected %s, got %s", h.blobHash[:16], actualHashHex[:16])
@@ -50,6 +53,7 @@ func (h *hashVerifyReader) Close() error {
 	if readerErr != nil {
 		return readerErr
 	}
+
 	return fetcherErr
 }
 
@@ -66,6 +70,7 @@ func (v *Vaultik) FetchAndDecryptBlob(ctx context.Context, blobHash string, expe
 	reader, err := blobgen.NewReader(rc, identity)
 	if err != nil {
 		_ = rc.Close()
+
 		return nil, fmt.Errorf("creating blob reader: %w", err)
 	}
 
@@ -86,6 +91,7 @@ func (v *Vaultik) FetchBlob(ctx context.Context, blobHash string, expectedSize i
 	t0 := time.Now()
 	rc, err := v.Storage.Get(ctx, blobPath)
 	getDur := time.Since(t0)
+
 	if err != nil {
 		return nil, 0, fmt.Errorf("downloading blob %s: %w", blobHash[:16], err)
 	}
@@ -93,8 +99,10 @@ func (v *Vaultik) FetchBlob(ctx context.Context, blobHash string, expectedSize i
 	t0 = time.Now()
 	info, err := v.Storage.Stat(ctx, blobPath)
 	statDur := time.Since(t0)
+
 	if err != nil {
 		_ = rc.Close()
+
 		return nil, 0, fmt.Errorf("stat blob %s: %w", blobHash[:16], err)
 	}