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package instance
import (
"errors"
"strings"
)
// IsRootDiskDevice returns true if the given device representation is configured as root disk for
// an instance. It typically get passed a specific entry of api.Instance.Devices.
func IsRootDiskDevice(device map[string]string) bool {
// Root disk devices also need a non-empty "pool" property, but we can't check that here
// because this function is used with clients talking to older servers where there was no
// concept of a storage pool, and also it is used for migrating from old to new servers.
// The validation of the non-empty "pool" property is done inside the disk device itself.
if device["type"] == "disk" && device["path"] == "/" && device["source"] == "" {
return true
}
return false
}
// ErrNoRootDisk means there is no root disk device found.
var ErrNoRootDisk = errors.New("No root device could be found")
// GetRootDiskDevice returns the instance device that is configured as root disk.
// Returns the device name and device config map.
func GetRootDiskDevice(devices map[string]map[string]string) (string, map[string]string, error) {
var devName string
var dev map[string]string
for n, d := range devices {
if IsRootDiskDevice(d) {
if devName != "" {
return "", nil, errors.New("More than one root device found")
}
devName = n
dev = d
}
}
if devName != "" {
return devName, dev, nil
}
return "", nil, ErrNoRootDisk
}
// SplitVolumeSource splits the volume name and any provided sub-path.
func SplitVolumeSource(source string) (string, string) {
volFields := strings.SplitN(source, "/", 2)
if len(volFields) == 1 {
return volFields[0], ""
}
return volFields[0], volFields[1]
}
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