handle fresh setup with mixed drives (#10273)

fresh drive setups when one of the drive is
a root drive, we should ignore such a root
drive and not proceed to format.

This PR handles this properly by marking
the disks which are root disk and they are
taken offline.

pkg/disk/root_disk_unix.go

@@ -31,18 +31,32 @@ func IsRootDisk(diskPath string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	rootInfo, err := os.Stat("/etc/hosts")
+	rootHostsInfo, err := os.Stat("/etc/hosts")
+	if err != nil {
+		return false, err
+	}
+	rootInfo, err := os.Stat("/")
 	if err != nil {
 		return false, err
 	}
 	diskStat, diskStatOK := diskInfo.Sys().(*syscall.Stat_t)
+	rootHostsStat, rootHostsStatOK := rootHostsInfo.Sys().(*syscall.Stat_t)
 	rootStat, rootStatOK := rootInfo.Sys().(*syscall.Stat_t)
-	if diskStatOK && rootStatOK {
-		if diskStat.Dev == rootStat.Dev {
+	if diskStatOK && rootHostsStatOK {
+		if diskStat.Dev == rootHostsStat.Dev {
 			// Indicate if the disk path is on root disk. This is used to indicate the healing
 			// process not to format the drive and end up healing it.
 			rootDisk = true
 		}
 	}
+	if !rootDisk {
+		if diskStatOK && rootStatOK {
+			if diskStat.Dev == rootStat.Dev {
+				// Indicate if the disk path is on root disk. This is used to indicate the healing
+				// process not to format the drive and end up healing it.
+				rootDisk = true
+			}
+		}
+	}
 	return rootDisk, nil
 }

pkg/madmin/info-commands.go

@@ -270,6 +270,7 @@ type ServerProperties struct {
 // Disk holds Disk information
 type Disk struct {
 	Endpoint        string  `json:"endpoint,omitempty"`
+	RootDisk        bool    `json:"rootDisk,omitempty"`
 	DrivePath       string  `json:"path,omitempty"`
 	State           string  `json:"state,omitempty"`
 	UUID            string  `json:"uuid,omitempty"`