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Merge pull request #21076 from calavera/fix_builtin_graphdriver_init 

Make sure we call every graph init with the same root path.
This commit is contained in:
Alexander Morozov 2016-03-11 14:20:39 -08:00
parent 81b7a1b756 ed6e33eede
commit e2d245ad81
1 changed files with 42 additions and 44 deletions
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86
daemon/graphdriver/driver.go
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@ -146,46 +146,53 @@ func getBuiltinDriver(name, home string, options []string, uidMaps, gidMaps []id
}
// New creates the driver and initializes it at the specified root.
func New(root string, name string, options []string, uidMaps, gidMaps []idtools.IDMap) (driver Driver, err error) {
func New(root string, name string, options []string, uidMaps, gidMaps []idtools.IDMap) (Driver, error) {
if name != "" {
logrus.Debugf("[graphdriver] trying provided driver %q", name) // so the logs show specified driver
return GetDriver(name, root, options, uidMaps, gidMaps)
}
// Guess for prior driver
priorDrivers := scanPriorDrivers(root)
driversMap := scanPriorDrivers(root)
for _, name := range priority {
if name == "vfs" {
// don't use vfs even if there is state present.
continue
}
for _, prior := range priorDrivers {
if _, prior := driversMap[name]; prior {
// of the state found from prior drivers, check in order of our priority
// which we would prefer
if prior == name {
driver, err = getBuiltinDriver(name, root, options, uidMaps, gidMaps)
if err != nil {
// unlike below, we will return error here, because there is prior
// state, and now it is no longer supported/prereq/compatible, so
// something changed and needs attention. Otherwise the daemon's
// images would just "disappear".
logrus.Errorf("[graphdriver] prior storage driver %q failed: %s", name, err)
return nil, err
}
if err := checkPriorDriver(name, root); err != nil {
return nil, err
}
logrus.Infof("[graphdriver] using prior storage driver %q", name)
return driver, nil
driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
if err != nil {
// unlike below, we will return error here, because there is prior
// state, and now it is no longer supported/prereq/compatible, so
// something changed and needs attention. Otherwise the daemon's
// images would just "disappear".
logrus.Errorf("[graphdriver] prior storage driver %q failed: %s", name, err)
return nil, err
}
// abort starting when there are other prior configured drivers
// to ensure the user explicitly selects the driver to load
if len(driversMap)-1 > 0 {
var driversSlice []string
for name := range driversMap {
driversSlice = append(driversSlice, name)
}
return nil, fmt.Errorf("%q contains several valid graphdrivers: %s; Please cleanup or explicitly choose storage driver (-s <DRIVER>)", root, strings.Join(driversSlice, ", "))
}
logrus.Infof("[graphdriver] using prior storage driver %q", name)
return driver, nil
}
}
// Check for priority drivers first
for _, name := range priority {
driver, err = getBuiltinDriver(name, root, options, uidMaps, gidMaps)
driver, err := getBuiltinDriver(name, root, options, uidMaps, gidMaps)
if err != nil {
if err == ErrNotSupported || err == ErrPrerequisites || err == ErrIncompatibleFS {
if isDriverNotSupported(err) {
continue
}
return nil, err
@ -194,9 +201,10 @@ func New(root string, name string, options []string, uidMaps, gidMaps []idtools.
}
// Check all registered drivers if no priority driver is found
for _, initFunc := range drivers {
if driver, err = initFunc(root, options, uidMaps, gidMaps); err != nil {
if err == ErrNotSupported || err == ErrPrerequisites || err == ErrIncompatibleFS {
for name, initFunc := range drivers {
driver, err := initFunc(filepath.Join(root, name), options, uidMaps, gidMaps)
if err != nil {
if isDriverNotSupported(err) {
continue
}
return nil, err
@ -206,31 +214,21 @@ func New(root string, name string, options []string, uidMaps, gidMaps []idtools.
return nil, fmt.Errorf("No supported storage backend found")
}
// isDriverNotSupported returns true if the error initializing
// the graph driver is a non-supported error.
func isDriverNotSupported(err error) bool {
return err == ErrNotSupported || err == ErrPrerequisites || err == ErrIncompatibleFS
}
// scanPriorDrivers returns an un-ordered scan of directories of prior storage drivers
func scanPriorDrivers(root string) []string {
priorDrivers := []string{}
func scanPriorDrivers(root string) map[string]bool {
driversMap := make(map[string]bool)
for driver := range drivers {
p := filepath.Join(root, driver)
if _, err := os.Stat(p); err == nil && driver != "vfs" {
priorDrivers = append(priorDrivers, driver)
driversMap[driver] = true
}
}
return priorDrivers
}
func checkPriorDriver(name, root string) error {
priorDrivers := []string{}
for _, prior := range scanPriorDrivers(root) {
if prior != name && prior != "vfs" {
if _, err := os.Stat(filepath.Join(root, prior)); err == nil {
priorDrivers = append(priorDrivers, prior)
}
}
}
if len(priorDrivers) > 0 {
return fmt.Errorf("%q contains other graphdrivers: %s; Please cleanup or explicitly choose storage driver (-s <DRIVER>)", root, strings.Join(priorDrivers, ","))
}
return nil
return driversMap
}