Fix typos and wrap errors (#82)

* Fix typo

* Fix golint warnings

* wrap errors

* fix

* fix

cli/application.go

@@ -97,18 +97,18 @@ func (app *BuildApplication) PostFlagParse() error {
 
 	logger, err := app.getLogger()
 	if err != nil {
-		return fmt.Errorf("build logger: %v", err)
+		return fmt.Errorf("build logger: %s", err)
 	}
 	log.SetLogger(logger.Sugar())
 
 	if app.Profile {
 		if err := app.setupProfiler(); err != nil {
-			return fmt.Errorf("setup profiler: %v", err)
+			return fmt.Errorf("setup profiler: %s", err)
 		}
 	}
 
 	if err := app.BuildFlags.postInit(); err != nil {
-		return err
+		return fmt.Errorf("process flags: %s", err)
 	}
 	return nil
 }

lib/builder/build_stage.go

@@ -225,7 +225,7 @@ func (stage *buildStage) saveImage(store storage.ImageStore, repo, tag string) (
 	}
 
 	manifestPath := manifestFile.Name()
-	// Remove temp file after hardlinked to manifest store
+	// Remove temp file after hard-linked to manifest store
 	defer os.Remove(manifestPath)
 
 	if err := ioutil.WriteFile(manifestPath, manifestJSON, 0755); err != nil {

lib/cache/fs_store.go

@@ -16,6 +16,7 @@ package cache
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"sync"
@@ -52,11 +53,11 @@ func NewFSStore(fullpath string, sandboxDir string, ttlsec int64) (KVStore, erro
 	if os.IsNotExist(err) {
 		return s, nil
 	} else if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("read cache id file: %s", err)
 	}
 	if err := json.Unmarshal(contents, &s.entries); err != nil {
 		if err := os.Remove(fullpath); err != nil {
-			return nil, err
+			return nil, fmt.Errorf("remove cache id file: %s", err)
 		}
 		return s, nil
 	}
@@ -99,20 +100,20 @@ func (s *fsStore) Put(key, value string) error {
 
 	content, err := json.Marshal(s.entries)
 	if err != nil {
-		return err
+		return fmt.Errorf("marshal cache id file: %s", err)
 	}
 
 	tempFile, err := ioutil.TempFile(s.sandboxDir, "cache")
 	if err != nil {
-		return err
+		return fmt.Errorf("create temp cache id file: %s", err)
 	}
 	defer os.Remove(tempFile.Name())
 
 	if err := ioutil.WriteFile(tempFile.Name(), content, 0755); err != nil {
-		return err
+		return fmt.Errorf("write to temp cache id file: %s", err)
 	}
 	if err := os.Rename(tempFile.Name(), s.fullpath); err != nil {
-		return err
+		return fmt.Errorf("rename cache id file: %s", err)
 	}
 
 	return nil
@@ -124,5 +125,9 @@ func (s *fsStore) Cleanup() error {
 
 	s.entries = make(map[string]*cacheEntry)
 
-	return os.Remove(s.fullpath)
+	if err := os.Remove(s.fullpath); err != nil {
+		return fmt.Errorf("remove cache id file: %s", err)
+	}
+
+	return nil
 }

lib/context/build_context.go

@@ -43,7 +43,7 @@ type BuildContext struct {
 	// persisted.
 	StageVars map[string]string
 
-	// MemFS and ImageStore can be shared accross all copies of the BuildContext.
+	// MemFS and ImageStore can be shared across all copies of the BuildContext.
 	MemFS      *snapshot.MemFS    // Merged view of base layers. Layers should be merged in order.
 	ImageStore storage.ImageStore // Stores image layers and manifests.
 

lib/snapshot/testutils_test.go

@@ -201,7 +201,7 @@ func findNode(fs *MemFS, p string, followSymlink bool, depth int) (*memFSNode, e
 }
 
 func writeTarHelper(m *memFile, srcRoot string, w *tar.Writer) error {
-	if err := filepath.Walk(srcRoot, func(p string, fi os.FileInfo, err error) error {
+	return filepath.Walk(srcRoot, func(p string, fi os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
@@ -213,14 +213,8 @@ func writeTarHelper(m *memFile, srcRoot string, w *tar.Writer) error {
 			return err
 		}
 
-		if err := tario.WriteEntry(w, p, h); err != nil {
-			return err
-		}
-		return nil
-	}); err != nil {
-		return err
-	}
-	return nil
+		return tario.WriteEntry(w, p, h)
+	})
 }
 
 func readTarHelper(r *tar.Reader) (map[string]*tar.Header, error) {