Add disk detection for Linux, add new RPC service GetDiskInfoService(), remove dummy HelloService()

pkg/utils/scsi/scsi.go

@@ -0,0 +1,101 @@
+// +build linux,amd64
+
+/*
+ * Minimalist 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
+
+import (
+	"errors"
+	"io/ioutil"
+	"path/filepath"
+
+	"github.com/minio/minio/pkg/iodine"
+)
+
+// NOTE : supporting virtio based scsi devices is out of scope for this implementation
+
+// Attributes Scsi device attributes
+type Attributes map[string]string
+
+// Disks is a list of scsis disks and attributes
+type Disks map[string]Attributes
+
+// Get get disk scsi params
+func (d Disks) Get(disk string) Attributes {
+	return d[disk]
+}
+
+// Len return len of total disks
+func (d Disks) Len() int {
+	return len(d)
+}
+
+// GetDisks - get system devices list
+func GetDisks() (Disks, error) {
+	var scsidevices []string
+	var scsiAttrList []string
+	d := Disks{}
+
+	sysFiles, err := ioutil.ReadDir(sysFSDEVICES)
+	if err != nil {
+		return Disks{}, iodine.New(err, nil)
+	}
+
+	scsidevices = filterdisks(sysFiles)
+	if len(scsidevices) == 0 {
+		// may be a docker instance, ignore this
+		return Disks{}, nil
+	}
+
+	for _, s := range scsidevices {
+		scsiAttrPath := filepath.Join(sysFSDEVICES, s)
+		scsiAttrs, err := ioutil.ReadDir(scsiAttrPath)
+		if err != nil {
+			return Disks{}, iodine.New(err, nil)
+		}
+		scsiBlockPath := filepath.Join(sysFSDEVICES, s, sysFSBLOCK)
+		scsidevList, err := ioutil.ReadDir(scsiBlockPath)
+		if err != nil {
+			return Disks{}, iodine.New(err, nil)
+		}
+		if len(scsidevList) > 1 {
+			return Disks{}, iodine.New(errors.New("Scsi address points to multiple block devices"), nil)
+		}
+		device := filepath.Join(udev, scsidevList[0].Name())
+		for _, sa := range scsiAttrs {
+			// Skip directories
+			if sa.IsDir() {
+				continue
+			}
+			// Skip symlinks
+			if !sa.Mode().IsRegular() {
+				continue
+			}
+			// Skip, not readable, write-only
+			if sa.Mode().Perm() == 128 {
+				continue
+			}
+			scsiAttrList = append(scsiAttrList, sa.Name())
+		}
+
+		if len(scsiAttrList) == 0 {
+			return Disks{}, iodine.New(errors.New("No scsi attributes found"), nil)
+		}
+		d[device] = getattrs(scsiAttrPath, scsiAttrList)
+	}
+	return d, nil
+}