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Merge pull request #45311 from vmware/fix_fetch_VM_UUID

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Automatic merge from submit-queue (batch tested with PRs 41903, 45311, 45474, 45472, 45501)

Fetch VM UUID from - /sys/class/dmi/id/product_serial

**What this PR does / why we need it**:
Current code fetch VM uuid using uuid reported at `'/sys/devices/virtual/dmi/id/product_uuid'.` This doesn't work with all the distros like Ubuntu 16.04 and Fedora. 

updating code to fetch VM uuid from `/sys/class/dmi/id/product_serial`



**Which issue this PR fixes**
fixes #

**Special notes for your reviewer**:
Verified UUID  is matching with VM UUID on ubuntu 16.04, Cent OS 7.3 , and Photon OS

@BaluDontu @tusharnt

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-05-08 15:46:37 -07:00 committed by GitHub
commit 52903829b1
1 changed files with 28 additions and 4 deletions
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32
pkg/cloudprovider/providers/vsphere/vsphere.go
View File

@ -80,6 +80,8 @@ const (
NonSupportedControllerTypeErrMsg = "Disk is attached to non-supported controller type"
FileAlreadyExistErrMsg = "File requested already exist"
CleanUpDummyVMRoutine_Interval = 5
UUIDPath = "/sys/class/dmi/id/product_serial"
UUIDPrefix = "VMware-"
)
// Controller types that are currently supported for hot attach of disks
@ -227,24 +229,46 @@ func init() {
})
}
// UUID gets the BIOS UUID via the sys interface. This UUID is known by vsphere
func getvmUUID() (string, error) {
id, err := ioutil.ReadFile(UUIDPath)
if err != nil {
return "", fmt.Errorf("error retrieving vm uuid: %s", err)
}
uuidFromFile := string(id[:])
//strip leading and trailing white space and new line char
uuid := strings.TrimSpace(uuidFromFile)
// check the uuid starts with "VMware-"
if !strings.HasPrefix(uuid, UUIDPrefix) {
return "", fmt.Errorf("Failed to match Prefix, UUID read from the file is %v", uuidFromFile)
}
// Strip the prefix and while spaces and -
uuid = strings.Replace(uuid[len(UUIDPrefix):(len(uuid))], " ", "", -1)
uuid = strings.Replace(uuid, "-", "", -1)
if len(uuid) != 32 {
return "", fmt.Errorf("Length check failed, UUID read from the file is %v", uuidFromFile)
}
// need to add dashes, e.g. "564d395e-d807-e18a-cb25-b79f65eb2b9f"
uuid = fmt.Sprintf("%s-%s-%s-%s-%s", uuid[0:8], uuid[8:12], uuid[12:16], uuid[16:20], uuid[20:32])
return uuid, nil
}
// Returns the name of the VM on which this code is running.
// Prerequisite: this code assumes VMWare vmtools or open-vm-tools to be installed in the VM.
// Will attempt to determine the machine's name via it's UUID in this precedence order, failing if neither have a UUID:
// * cloud config value VMUUID
// * sysfs entry
func getVMName(client *govmomi.Client, cfg *VSphereConfig) (string, error) {
var vmUUID string
var err error
if cfg.Global.VMUUID != "" {
vmUUID = cfg.Global.VMUUID
} else {
// This needs root privileges on the host, and will fail otherwise.
vmUUIDbytes, err := ioutil.ReadFile("/sys/devices/virtual/dmi/id/product_uuid")
vmUUID, err = getvmUUID()
if err != nil {
return "", err
}
vmUUID = string(vmUUIDbytes)
cfg.Global.VMUUID = vmUUID
}