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graphdriver: Fail initialization if supported but got error

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If a graphdriver fails initialization due to ErrNotSupported we ignore
that and keep trying the next. But if some driver has a different
error (for instance if you specified an unknown option for it) we fail
the daemon startup, printing the error, rather than falling back to an
unexected driver (typically vfs) which may not match what you have run
earlier.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This commit is contained in:
Alexander Larsson 2014-03-27 17:41:06 +01:00
parent 27744062aa
commit 4bdb8c03fc
4 changed files with 18 additions and 10 deletions
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2
daemon/graphdriver/aufs/aufs.go
View file

@ -54,7 +54,7 @@ type Driver struct {
func Init(root string) (graphdriver.Driver, error) {
// Try to load the aufs kernel module
if err := supportsAufs(); err != nil {
return nil, err
return nil, graphdriver.ErrNotSupported
}
paths := []string{
"mnt",

2
daemon/graphdriver/aufs/aufs_test.go
View file

@ -19,7 +19,7 @@ var (
func testInit(dir string, t *testing.T) graphdriver.Driver {
d, err := Init(dir)
if err != nil {
if err == ErrAufsNotSupported {
if err == graphdriver.ErrNotSupported {
t.Skip(err)
} else {
t.Fatal(err)

2
daemon/graphdriver/btrfs/btrfs.go
View file

@ -31,7 +31,7 @@ func Init(home string) (graphdriver.Driver, error) {
}
if buf.Type != 0x9123683E {
return nil, fmt.Errorf("%s is not a btrfs filesystem", rootdir)
return nil, graphdriver.ErrNotSupported
}
return &Driver{

22
daemon/graphdriver/driver.go
View file

@ -1,9 +1,9 @@
package graphdriver
import (
"errors"
"fmt"
"github.com/dotcloud/docker/archive"
"github.com/dotcloud/docker/utils"
"os"
"path"
)
@ -43,6 +43,8 @@ var (
"devicemapper",
"vfs",
}
ErrNotSupported = errors.New("driver not supported")
)
func init() {
@ -62,7 +64,7 @@ func GetDriver(name, home string) (Driver, error) {
if initFunc, exists := drivers[name]; exists {
return initFunc(path.Join(home, name))
}
return nil, fmt.Errorf("No such driver: %s", name)
return nil, ErrNotSupported
}
func New(root string) (driver Driver, err error) {
@ -74,9 +76,12 @@ func New(root string) (driver Driver, err error) {
// Check for priority drivers first
for _, name := range priority {
if driver, err = GetDriver(name, root); err != nil {
utils.Debugf("Error loading driver %s: %s", name, err)
continue
driver, err = GetDriver(name, root)
if err != nil {
if err == ErrNotSupported {
continue
}
return nil, err
}
return driver, nil
}
@ -84,9 +89,12 @@ func New(root string) (driver Driver, err error) {
// Check all registered drivers if no priority driver is found
for _, initFunc := range drivers {
if driver, err = initFunc(root); err != nil {
continue
if err == ErrNotSupported {
continue
}
return nil, err
}
return driver, nil
}
return nil, err
return nil, fmt.Errorf("No supported storage backend found")
}