Golint: remove redundant ifs

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

builder/fscache/fscache.go

@@ -485,10 +485,7 @@ func (s *fsCacheStore) delete(id string) error {
 	}); err != nil {
 		return err
 	}
-	if err := s.fs.Remove(src.BackendID); err != nil {
-		return err
-	}
-	return nil
+	return s.fs.Remove(src.BackendID)
 }
 
 type sourceMeta struct {

container/view.go

@@ -14,9 +14,8 @@ import (
 )
 
 const (
-	memdbContainersTable = "containers"
-	memdbNamesTable      = "names"
-
+	memdbContainersTable  = "containers"
+	memdbNamesTable       = "names"
 	memdbIDIndex          = "id"
 	memdbContainerIDIndex = "containerid"
 )
@@ -191,11 +190,7 @@ func (db *memDB) ReserveName(name, containerID string) error {
 			}
 			return nil
 		}
-
-		if err := txn.Insert(memdbNamesTable, nameAssociation{name: name, containerID: containerID}); err != nil {
-			return err
-		}
-		return nil
+		return txn.Insert(memdbNamesTable, nameAssociation{name: name, containerID: containerID})
 	})
 }
 

daemon/cluster/executor/container/adapter.go

@@ -262,11 +262,7 @@ func (c *containerAdapter) create(ctx context.Context) error {
 		return err
 	}
 
-	if err := c.backend.UpdateContainerServiceConfig(cr.ID, c.container.serviceConfig()); err != nil {
-		return err
-	}
-
-	return nil
+	return c.backend.UpdateContainerServiceConfig(cr.ID, c.container.serviceConfig())
 }
 
 // checkMounts ensures that the provided mounts won't have any host-specific

daemon/config/config.go

@@ -511,11 +511,7 @@ func Validate(config *Config) error {
 	}
 
 	// validate platform-specific settings
-	if err := config.ValidatePlatformConfig(); err != nil {
-		return err
-	}
-
-	return nil
+	return config.ValidatePlatformConfig()
 }
 
 // ModifiedDiscoverySettings returns whether the discovery configuration has been modified or not.

daemon/daemon.go

@@ -1046,11 +1046,7 @@ func (daemon *Daemon) Shutdown() error {
 		daemon.netController.Stop()
 	}
 
-	if err := daemon.cleanupMounts(); err != nil {
-		return err
-	}
-
-	return nil
+	return daemon.cleanupMounts()
 }
 
 // Mount sets container.BaseFS

daemon/daemon_unix.go

@@ -1501,10 +1501,7 @@ func (daemon *Daemon) initCgroupsPath(path string) error {
 	if err := maybeCreateCPURealTimeFile(sysinfo.CPURealtimePeriod, daemon.configStore.CPURealtimePeriod, "cpu.rt_period_us", path); err != nil {
 		return err
 	}
-	if err := maybeCreateCPURealTimeFile(sysinfo.CPURealtimeRuntime, daemon.configStore.CPURealtimeRuntime, "cpu.rt_runtime_us", path); err != nil {
-		return err
-	}
-	return nil
+	return maybeCreateCPURealTimeFile(sysinfo.CPURealtimeRuntime, daemon.configStore.CPURealtimeRuntime, "cpu.rt_runtime_us", path)
 }
 
 func maybeCreateCPURealTimeFile(sysinfoPresent bool, configValue int64, file string, path string) error {

daemon/graphdriver/aufs/aufs.go

@@ -579,10 +579,7 @@ func (a *Driver) unmount(mountPath string) error {
 	if mounted, err := a.mounted(mountPath); err != nil || !mounted {
 		return err
 	}
-	if err := Unmount(mountPath); err != nil {
-		return err
-	}
-	return nil
+	return Unmount(mountPath)
 }
 
 func (a *Driver) mounted(mountpoint string) (bool, error) {

daemon/graphdriver/aufs/mount.go

@@ -14,8 +14,5 @@ func Unmount(target string) error {
 	if err := exec.Command("auplink", target, "flush").Run(); err != nil {
 		logrus.Warnf("Couldn't run auplink before unmount %s: %s", target, err)
 	}
-	if err := unix.Unmount(target, 0); err != nil {
-		return err
-	}
-	return nil
+	return unix.Unmount(target, 0)
 }

daemon/graphdriver/btrfs/btrfs.go

@@ -598,16 +598,10 @@ func (d *Driver) setStorageSize(dir string, driver *Driver) error {
 	if d.options.minSpace > 0 && driver.options.size < d.options.minSpace {
 		return fmt.Errorf("btrfs: storage size cannot be less than %s", units.HumanSize(float64(d.options.minSpace)))
 	}
-
 	if err := d.subvolEnableQuota(); err != nil {
 		return err
 	}
-
-	if err := subvolLimitQgroup(dir, driver.options.size); err != nil {
-		return err
-	}
-
-	return nil
+	return subvolLimitQgroup(dir, driver.options.size)
 }
 
 // Remove the filesystem with given id.
@@ -634,10 +628,7 @@ func (d *Driver) Remove(id string) error {
 	if err := system.EnsureRemoveAll(dir); err != nil {
 		return err
 	}
-	if err := d.subvolRescanQuota(); err != nil {
-		return err
-	}
-	return nil
+	return d.subvolRescanQuota()
 }
 
 // Get the requested filesystem id.

daemon/graphdriver/copy/copy.go

@@ -273,8 +273,5 @@ func doCopyXattrs(srcPath, dstPath string) error {
 	// this function is used to copy those. It is set by overlay if a directory
 	// is removed and then re-created and should not inherit anything from the
 	// same dir in the lower dir.
-	if err := copyXattr(srcPath, dstPath, "trusted.overlay.opaque"); err != nil {
-		return err
-	}
-	return nil
+	return copyXattr(srcPath, dstPath, "trusted.overlay.opaque")
 }

daemon/graphdriver/devmapper/device_setup.go

@@ -129,15 +129,10 @@ func verifyBlockDevice(dev string, force bool) error {
 	if err := checkDevInVG(dev); err != nil {
 		return err
 	}
-
 	if force {
 		return nil
 	}
-
-	if err := checkDevHasFS(dev); err != nil {
-		return err
-	}
-	return nil
+	return checkDevHasFS(dev)
 }
 
 func readLVMConfig(root string) (directLVMConfig, error) {

daemon/graphdriver/devmapper/deviceset.go

@@ -355,10 +355,7 @@ func (devices *DeviceSet) saveMetadata(info *devInfo) error {
 	if err != nil {
 		return fmt.Errorf("devmapper: Error encoding metadata to json: %s", err)
 	}
-	if err := devices.writeMetaFile(jsonData, devices.metadataFile(info)); err != nil {
-		return err
-	}
-	return nil
+	return devices.writeMetaFile(jsonData, devices.metadataFile(info))
 }
 
 func (devices *DeviceSet) markDeviceIDUsed(deviceID int) {
@@ -889,11 +886,7 @@ func (devices *DeviceSet) takeSnapshot(hash string, baseInfo *devInfo, size uint
 		defer devicemapper.ResumeDevice(baseInfo.Name())
 	}
 
-	if err = devices.createRegisterSnapDevice(hash, baseInfo, size); err != nil {
-		return err
-	}
-
-	return nil
+	return devices.createRegisterSnapDevice(hash, baseInfo, size)
 }
 
 func (devices *DeviceSet) createRegisterSnapDevice(hash string, baseInfo *devInfo, size uint64) error {
@@ -1233,12 +1226,7 @@ func (devices *DeviceSet) setupBaseImage() error {
 			if err := devices.setupVerifyBaseImageUUIDFS(oldInfo); err != nil {
 				return err
 			}
-
-			if err := devices.checkGrowBaseDeviceFS(oldInfo); err != nil {
-				return err
-			}
-
-			return nil
+			return devices.checkGrowBaseDeviceFS(oldInfo)
 		}
 
 		logrus.Debug("devmapper: Removing uninitialized base image")
@@ -1259,11 +1247,7 @@ func (devices *DeviceSet) setupBaseImage() error {
 	}
 
 	// Create new base image device
-	if err := devices.createBaseImage(); err != nil {
-		return err
-	}
-
-	return nil
+	return devices.createBaseImage()
 }
 
 func setCloseOnExec(name string) {
@@ -2082,11 +2066,7 @@ func (devices *DeviceSet) deleteDevice(info *devInfo, syncDelete bool) error {
 		return err
 	}
 
-	if err := devices.deleteTransaction(info, syncDelete); err != nil {
-		return err
-	}
-
-	return nil
+	return devices.deleteTransaction(info, syncDelete)
 }
 
 // DeleteDevice will return success if device has been marked for deferred

daemon/graphdriver/devmapper/driver.go

@@ -146,12 +146,7 @@ func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {
 	if opts != nil {
 		storageOpt = opts.StorageOpt
 	}
-
-	if err := d.DeviceSet.AddDevice(id, parent, storageOpt); err != nil {
-		return err
-	}
-
-	return nil
+	return d.DeviceSet.AddDevice(id, parent, storageOpt)
 }
 
 // Remove removes a device with a given id, unmounts the filesystem.

daemon/graphdriver/graphtest/testutil.go

@@ -263,11 +263,7 @@ func addLayerFiles(drv graphdriver.Driver, layer, parent string, i int) error {
 	if err := driver.WriteFile(root, root.Join(layerDir, "layer-id"), []byte(layer), 0755); err != nil {
 		return err
 	}
-	if err := driver.WriteFile(root, root.Join(layerDir, "parent-id"), []byte(parent), 0755); err != nil {
-		return err
-	}
-
-	return nil
+	return driver.WriteFile(root, root.Join(layerDir, "parent-id"), []byte(parent), 0755)
 }
 
 func addManyLayers(drv graphdriver.Driver, baseLayer string, count int) (string, error) {

daemon/graphdriver/overlay/overlay.go

@@ -309,10 +309,7 @@ func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) (retErr
 		if err := idtools.MkdirAndChown(path.Join(dir, "work"), 0700, root); err != nil {
 			return err
 		}
-		if err := ioutil.WriteFile(path.Join(dir, "lower-id"), []byte(parent), 0666); err != nil {
-			return err
-		}
-		return nil
+		return ioutil.WriteFile(path.Join(dir, "lower-id"), []byte(parent), 0666)
 	}
 
 	// Otherwise, copy the upper and the lower-id from the parent

daemon/pause.go

@@ -14,12 +14,7 @@ func (daemon *Daemon) ContainerPause(name string) error {
 	if err != nil {
 		return err
 	}
-
-	if err := daemon.containerPause(container); err != nil {
-		return err
-	}
-
-	return nil
+	return daemon.containerPause(container)
 }
 
 // containerPause pauses the container execution without stopping the process.

daemon/start.go

@@ -90,11 +90,7 @@ func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.Hos
 			return validationError{err}
 		}
 	}
-
-	if err := daemon.containerStart(container, checkpoint, checkpointDir, true); err != nil {
-		return err
-	}
-	return nil
+	return daemon.containerStart(container, checkpoint, checkpointDir, true)
 }
 
 // containerStart prepares the container to run by setting up everything the

daemon/unpause.go

@@ -14,12 +14,7 @@ func (daemon *Daemon) ContainerUnpause(name string) error {
 	if err != nil {
 		return err
 	}
-
-	if err := daemon.containerUnpause(container); err != nil {
-		return err
-	}
-
-	return nil
+	return daemon.containerUnpause(container)
 }
 
 // containerUnpause resumes the container execution after the container is paused.

image/fs.go

@@ -133,10 +133,7 @@ func (s *fs) Delete(dgst digest.Digest) error {
 	if err := os.RemoveAll(s.metadataDir(dgst)); err != nil {
 		return err
 	}
-	if err := os.Remove(s.contentFile(dgst)); err != nil {
-		return err
-	}
-	return nil
+	return os.Remove(s.contentFile(dgst))
 }
 
 // SetMetadata sets metadata for a given ID. It fails if there's no base file.

integration-cli/daemon/daemon.go

@@ -348,11 +348,7 @@ func (d *Daemon) Kill() error {
 		return err
 	}
 
-	if err := os.Remove(fmt.Sprintf("%s/docker.pid", d.Folder)); err != nil {
-		return err
-	}
-
-	return nil
+	return os.Remove(fmt.Sprintf("%s/docker.pid", d.Folder))
 }
 
 // Pid returns the pid of the daemon
@@ -459,11 +455,7 @@ out2:
 
 	d.cmd.Wait()
 
-	if err := os.Remove(fmt.Sprintf("%s/docker.pid", d.Folder)); err != nil {
-		return err
-	}
-
-	return nil
+	return os.Remove(fmt.Sprintf("%s/docker.pid", d.Folder))
 }
 
 // Restart will restart the daemon by first stopping it and the starting it.

integration-cli/docker_api_network_test.go

@@ -328,9 +328,8 @@ func createNetwork(c *check.C, config types.NetworkCreateRequest, expectedStatus
 		c.Assert(err, checker.IsNil)
 
 		return nr.ID
-	} else {
-		return ""
 	}
+	return ""
 }
 
 func connectNetwork(c *check.C, nid, cid string) {

layer/layer_test.go

@@ -153,10 +153,7 @@ func (tf *testFile) ApplyFile(root containerfs.ContainerFS) error {
 			return err
 		}
 	}
-	if err := driver.WriteFile(root, fullPath, tf.content, tf.permission); err != nil {
-		return err
-	}
-	return nil
+	return driver.WriteFile(root, fullPath, tf.content, tf.permission)
 }
 
 func initWithFiles(files ...FileApplier) layerInit {

layer/migration.go

@@ -68,11 +68,7 @@ func (ls *layerStore) CreateRWLayerByGraphID(name string, graphID string, parent
 		m.initID = initID
 	}
 
-	if err = ls.saveMount(m); err != nil {
-		return err
-	}
-
-	return nil
+	return ls.saveMount(m)
 }
 
 func (ls *layerStore) ChecksumForGraphID(id, parent, oldTarDataPath, newTarDataPath string) (diffID DiffID, size int64, err error) {

layer/ro_layer.go

@@ -143,11 +143,7 @@ func storeLayer(tx MetadataTransaction, layer *roLayer) error {
 			return err
 		}
 	}
-	if err := tx.SetOS(layer.os); err != nil {
-		return err
-	}
-
-	return nil
+	return tx.SetOS(layer.os)
 }
 
 func newVerifiedReadCloser(rc io.ReadCloser, dgst digest.Digest) (io.ReadCloser, error) {