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driver.go
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driver.go
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package graphdriver
import (
"fmt"
)
type InitFunc func(root string) (Driver, error)
var (
// All registred drivers
drivers map[string]InitFunc
// Slice of drivers that should be used in an order
priority = []string{
"aufs",
"devicemapper",
}
)
func Register(name string, initFunc InitFunc) error {
if _, exists := drivers[name]; exists {
return fmt.Errorf("Name already registered %s", name)
}
drivers[name] = initFunc
return nil
}
func New(root string) (Driver, error) {
var driver Driver
var lastError error
// Check for priority drivers first
for _, name := range priority {
if initFunc, exists := drivers[name]; exists {
driver, lastError = initFunc(root)
if lastError != nil {
continue
}
return driver, nil
}
}
// Check all registered drivers if no priority driver is found
for _, initFunc := range drivers {
driver, lastError = initFunc(root)
if lastError != nil {
continue
}
return driver, nil
}
return nil, lastError
}
type Image interface {
Layers() ([]string, error)
}
type Driver interface {
// Create(img *Image) error
// Delete(img *Image) error
Mount(img Image, root string) error
Unmount(root string) error
Mounted(root string) (bool, error)
// UnmountAll(img *Image) error
// Changes(img *Image, dest string) ([]Change, error)
// Layer(img *Image, dest string) (Archive, error)
}