GetDisks returns a string slice containing the names of all the disks attached to the local instance.

GetIndex returns the trailing "document" in a URL.

InstanceID returns the instance ID for the local host.

IsGCEInstance returns a flag indicating whether the executing host is a GCE instance based on whether or not the metadata URL can be accessed.

IsValidDiskName returns a boolean of whether the given name is valid for a GCE disk.

DiskNameRX contains the regex pattern for matching a valid GCE disk name the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.

Disk holds the data returned in the disks metadata.