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Avoid returning nil, nil when fetching a manifest by tag by introducing a new

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error ErrManifestNotModified which can be checked by clients.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
This commit is contained in:
Richard Scothern 2015-09-18 11:00:44 -07:00
parent ece8e132bf
commit 924913b4c3
4 changed files with 11 additions and 9 deletions
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7
errors.go
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@ -1,15 +1,20 @@
package distribution
import (
"errors"
"fmt"
"strings"
"github.com/docker/distribution/digest"
)
// ErrManifestNotModified is returned when a conditional manifest GetByTag
// returns nil due to the client indicating it has the latest version
var ErrManifestNotModified = errors.New("manifest not modified")
// ErrUnsupported is returned when an unimplemented or unsupported action is
// performed
var ErrUnsupported = fmt.Errorf("operation unsupported")
var ErrUnsupported = errors.New("operation unsupported")
// ErrRepositoryUnknown is returned if the named repository is not known by
// the registry.