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87a12421a9
Instead of having to create a bunch of custom error types that are doing
nothing but wrapping another error in sub-packages, use a common helper
to create errors of the requested type.
e.g. instead of re-implementing this over and over:
```go
type notFoundError struct {
cause error
}
func(e notFoundError) Error() string {
return e.cause.Error()
}
func(e notFoundError) NotFound() {}
func(e notFoundError) Cause() error {
return e.cause
}
```
Packages can instead just do:
```
errdefs.NotFound(err)
```
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
79 lines
2.1 KiB
Go
79 lines
2.1 KiB
Go
package daemon
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import (
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"fmt"
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"runtime"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/api/errdefs"
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"github.com/docker/docker/image"
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)
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// errImageDoesNotExist is error returned when no image can be found for a reference.
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type errImageDoesNotExist struct {
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ref reference.Reference
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}
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func (e errImageDoesNotExist) Error() string {
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ref := e.ref
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if named, ok := ref.(reference.Named); ok {
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ref = reference.TagNameOnly(named)
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}
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return fmt.Sprintf("No such image: %s", reference.FamiliarString(ref))
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}
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func (e errImageDoesNotExist) NotFound() {}
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// GetImageIDAndOS returns an image ID and operating system corresponding to the image referred to by
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// refOrID.
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func (daemon *Daemon) GetImageIDAndOS(refOrID string) (image.ID, string, error) {
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ref, err := reference.ParseAnyReference(refOrID)
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if err != nil {
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return "", "", errdefs.InvalidParameter(err)
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}
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namedRef, ok := ref.(reference.Named)
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if !ok {
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digested, ok := ref.(reference.Digested)
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if !ok {
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return "", "", errImageDoesNotExist{ref}
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}
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id := image.IDFromDigest(digested.Digest())
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for platform := range daemon.stores {
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if _, err = daemon.stores[platform].imageStore.Get(id); err == nil {
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return id, platform, nil
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}
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}
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return "", "", errImageDoesNotExist{ref}
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}
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if digest, err := daemon.referenceStore.Get(namedRef); err == nil {
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// Search the image stores to get the operating system, defaulting to host OS.
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imageOS := runtime.GOOS
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id := image.IDFromDigest(digest)
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for os := range daemon.stores {
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if img, err := daemon.stores[os].imageStore.Get(id); err == nil {
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imageOS = img.OperatingSystem()
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break
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}
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}
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return id, imageOS, nil
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}
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// Search based on ID
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for os := range daemon.stores {
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if id, err := daemon.stores[os].imageStore.Search(refOrID); err == nil {
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return id, os, nil
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}
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}
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return "", "", errImageDoesNotExist{ref}
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}
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// GetImage returns an image corresponding to the image referred to by refOrID.
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func (daemon *Daemon) GetImage(refOrID string) (*image.Image, error) {
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imgID, os, err := daemon.GetImageIDAndOS(refOrID)
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if err != nil {
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return nil, err
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}
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return daemon.stores[os].imageStore.Get(imgID)
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}
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