deleter.go

Documentation: cuelabs.dev/go/oci/ociregistry/ocimem

     1  // Copyright 2023 CUE Labs AG
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ocimem
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  
    21  	"cuelabs.dev/go/oci/ociregistry"
    22  )
    23  
    24  var (
    25  	errCannotDeleteTag            = fmt.Errorf("%w: tag deletion not permitted", ociregistry.ErrDenied)
    26  	errCannotDeleteTaggedBlob     = fmt.Errorf("%w: deletion of tagged blob not permitted", ociregistry.ErrDenied)
    27  	errCannotDeleteTaggedManifest = fmt.Errorf("%w: deletion of tagged manifest not permitted", ociregistry.ErrDenied)
    28  )
    29  
    30  func (r *Registry) DeleteBlob(ctx context.Context, repoName string, digest ociregistry.Digest) error {
    31  	r.mu.Lock()
    32  	defer r.mu.Unlock()
    33  	if _, err := r.blobForDigest(repoName, digest); err != nil {
    34  		return err
    35  	}
    36  	repo, ok := r.repos[repoName]
    37  	if !ok {
    38  		return nil
    39  	}
    40  	if r.cfg.ImmutableTags {
    41  		ok, err := refersTo(repo, repoTagIter(repo), digest)
    42  		if err != nil {
    43  			return err
    44  		}
    45  		if ok {
    46  			return errCannotDeleteTaggedBlob
    47  		}
    48  	}
    49  	// TODO if r.cfg.ImmutableTags, refuse to delete the blob
    50  	// if it's referred to, directly or indirectly, by a tag.
    51  	delete(r.repos[repoName].blobs, digest)
    52  	return nil
    53  }
    54  
    55  func (r *Registry) DeleteManifest(ctx context.Context, repoName string, digest ociregistry.Digest) error {
    56  	r.mu.Lock()
    57  	defer r.mu.Unlock()
    58  	if _, err := r.manifestForDigest(repoName, digest); err != nil {
    59  		return err
    60  	}
    61  	repo := r.repos[repoName]
    62  	if r.cfg.ImmutableTags {
    63  		ok, err := refersTo(repo, repoTagIter(repo), digest)
    64  		if err != nil {
    65  			return err
    66  		}
    67  		if ok {
    68  			return errCannotDeleteTaggedManifest
    69  		}
    70  	}
    71  	// TODO should this also delete any tags referring to this digest?
    72  	delete(repo.manifests, digest)
    73  	return nil
    74  }
    75  
    76  func (r *Registry) DeleteTag(ctx context.Context, repoName string, tagName string) error {
    77  	r.mu.Lock()
    78  	defer r.mu.Unlock()
    79  	repo, err := r.repo(repoName)
    80  	if err != nil {
    81  		return err
    82  	}
    83  	if _, ok := repo.tags[tagName]; !ok {
    84  		return fmt.Errorf("%w: tag does not exist", ociregistry.ErrManifestUnknown)
    85  	}
    86  	if r.cfg.ImmutableTags {
    87  		return errCannotDeleteTag
    88  	}
    89  	delete(repo.tags, tagName)
    90  	return nil
    91  }
    92
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