Fix golint warnings

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

graph/history.go

@@ -44,10 +44,9 @@ func (graph *Graph) depth(img *image.Image) (int, error) {
 	return count, nil
 }
 
-// Set the max depth to the aufs default that most
-// kernels are compiled with
+// Set the max depth to the aufs default that most kernels are compiled with.
 // For more information see: http://sourceforge.net/p/aufs/aufs3-standalone/ci/aufs3.12/tree/config.mk
-const MaxImageDepth = 127
+const maxImageDepth = 127
 
 // CheckDepth returns an error if the depth of an image, as returned
 // by ImageDepth, is too large to support creating a container from it
@@ -59,8 +58,8 @@ func (graph *Graph) CheckDepth(img *image.Image) error {
 	if err != nil {
 		return err
 	}
-	if depth+2 >= MaxImageDepth {
-		return fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth)
+	if depth+2 >= maxImageDepth {
+		return fmt.Errorf("Cannot create container with more than %d parents", maxImageDepth)
 	}
 	return nil
 }

pkg/devicemapper/devmapper_wrapper_deferred_remove.go

@@ -8,7 +8,7 @@ package devicemapper
 */
 import "C"
 
-// LibraryDeferredRemovalsupport is supported when statically linked.
+// LibraryDeferredRemovalSupport is supported when statically linked.
 const LibraryDeferredRemovalSupport = true
 
 func dmTaskDeferredRemoveFct(task *cdmTask) int {

pkg/mflag/flag.go

@@ -589,7 +589,7 @@ var Usage = func() {
 	PrintDefaults()
 }
 
-// Usage prints to standard error a usage message documenting the standard command layout
+// ShortUsage prints to standard error a usage message documenting the standard command layout
 // The function is a variable that may be changed to point to a custom function.
 var ShortUsage = func() {
 	fmt.Fprintf(CommandLine.output, "Usage of %s:\n", os.Args[0])

pkg/stringid/stringid.go

@@ -34,7 +34,7 @@ func TruncateID(id string) string {
 
 func generateID(crypto bool) string {
 	b := make([]byte, 32)
-	var r io.Reader = random.Reader
+	r := random.Reader
 	if crypto {
 		r = rand.Reader
 	}

pkg/tarsum/tarsum.go

@@ -146,7 +146,7 @@ var (
 	}
 )
 
-// TarSum default is "sha256"
+// DefaultTHash is default TarSum hashing algoritm - "sha256".
 var DefaultTHash = NewTHash("sha256", sha256.New)
 
 type simpleTHash struct {

pkg/tlsconfig/config.go

@@ -47,8 +47,9 @@ var clientCipherSuites = []uint16{
 	tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
 }
 
-// For use by code which already has a crypto/tls options struct but wants to
-// use a commonly accepted set of TLS cipher suites, with known weak algorithms removed
+// DefaultServerAcceptedCiphers should be uses by code which already has a crypto/tls
+// options struct but wants to use a commonly accepted set of TLS cipher suites, with
+// known weak algorithms removed.
 var DefaultServerAcceptedCiphers = append(clientCipherSuites, acceptedCBCCiphers...)
 
 // ServerDefault is a secure-enough TLS configuration for the server TLS configuration.