Moving scsi pkg away from errors.New

pkg/os/scsi/errors.go

@@ -0,0 +1,47 @@
+/*
+ * Mini Object Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package scsi
+
+type NoDiskAttributesFound struct{}
+
+func (self NoDiskAttributesFound) Error() string {
+	return "No Disk Attributes Found"
+}
+
+type NoDiskQueueAttributesFound struct{}
+
+func (self NoDiskQueueAttributesFound) Error() string {
+	return "No Disk Queue Attributes Found"
+}
+
+type NoScsiDevicesFoundOnSystem struct{}
+
+func (self NoScsiDevicesFoundOnSystem) Error() string {
+	return "No scsi devices found on the system"
+}
+
+type ScsiAddressPointsToMultipleBlockDevices struct{}
+
+func (self ScsiAddressPointsToMultipleBlockDevices) Error() string {
+	return "Scsi address points to multiple block devices"
+}
+
+type NoScsiAttributesFound struct{}
+
+func (self NoScsiAttributesFound) Error() string {
+	return "No Scsi Attributes Found"
+}

pkg/os/scsi/scsi_linux.go

@@ -19,7 +19,6 @@
 package scsi
 
 import (
-	"errors"
 	"io/ioutil"
 	"path"
 )
@@ -86,11 +85,11 @@ func (d *Devices) getInfo(disk string) (map[string][]byte, error) {
 	}
 
 	if len(diskAttrsList) == 0 {
-		return nil, errors.New("No disk attributes found")
+		return nil, NoDiskAttributesFound{}
 	}
 
 	if len(diskQueueAttrs) == 0 {
-		return nil, errors.New("No disk queue attributes found")
+		return nil, NoDiskQueueAttributesFound{}
 	}
 
 	diskAttrMap := getattrs(sysfs_block_dev, diskAttrsList)
@@ -118,7 +117,7 @@ func (d *Devices) Get() error {
 
 	scsidevices = filterdevices(sysFiles)
 	if len(scsidevices) == 0 {
-		return errors.New("No scsi devices found on the system")
+		return NoScsiDevicesFoundOnSystem{}
 	}
 
 	for _, scsi := range scsidevices {
@@ -135,7 +134,7 @@ func (d *Devices) Get() error {
 		}
 
 		if len(scsidevList) > 1 {
-			return errors.New("Scsi address points to multiple block devices")
+			return ScsiAddressPointsToMultipleBlockDevices{}
 		}
 
 		_scsi.Disk = UDEV + scsidevList[0].Name()
@@ -156,7 +155,7 @@ func (d *Devices) Get() error {
 		}
 
 		if len(scsiAttrList) == 0 {
-			return errors.New("No scsi attributes found")
+			return NoScsiAttributesFound{}
 		}
 		attrMap := getattrs(scsiAttrPath, scsiAttrList)
 		_scsi.Scsiattrmap = attrMap