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fix: pushing based on temporary file store path (oras-project#996)
Signed-off-by: Billy Zha <jinzha1@microsoft.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| Copyright The ORAS Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package contentutil | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "io" | ||
|
|
||
| ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "oras.land/oras-go/v2" | ||
| "oras.land/oras-go/v2/errdef" | ||
| ) | ||
|
|
||
| type multiReadOnlyTarget struct { | ||
| targets []oras.ReadOnlyTarget | ||
| } | ||
|
|
||
| // MultiReadOnlyTarget returns a ReadOnlyTarget that combines multiple targets. | ||
| func MultiReadOnlyTarget(targets ...oras.ReadOnlyTarget) oras.ReadOnlyTarget { | ||
| return &multiReadOnlyTarget{ | ||
| targets: targets, | ||
| } | ||
| } | ||
|
|
||
| // Fetch fetches the content from the targets in order and return first found | ||
| // content. If no content is found, it returns ErrNotFound. | ||
| func (m *multiReadOnlyTarget) Fetch(ctx context.Context, target ocispec.Descriptor) (io.ReadCloser, error) { | ||
| lastErr := errdef.ErrNotFound | ||
| for _, c := range m.targets { | ||
| rc, err := c.Fetch(ctx, target) | ||
| if err == nil { | ||
| return rc, nil | ||
| } | ||
| if !errors.Is(err, errdef.ErrNotFound) { | ||
| return nil, err | ||
| } | ||
| lastErr = err | ||
| } | ||
| return nil, lastErr | ||
| } | ||
|
|
||
| // Exists returns true if the content exists in any of the targets. | ||
| // multiReadOnlyTarget does not implement Exists() because it's read-only. | ||
| func (m *multiReadOnlyTarget) Exists(ctx context.Context, target ocispec.Descriptor) (bool, error) { | ||
| return false, errors.New("MultiReadOnlyTarget.Exists() is not implemented") | ||
| } | ||
|
|
||
| // Resolve resolves the reference to a descriptor from the targets in order and | ||
| // return first found descriptor. If no descriptor is found, it returns | ||
| // ErrNotFound. | ||
| func (m *multiReadOnlyTarget) Resolve(ctx context.Context, ref string) (ocispec.Descriptor, error) { | ||
| lastErr := errdef.ErrNotFound | ||
| for _, c := range m.targets { | ||
| desc, err := c.Resolve(ctx, ref) | ||
| if err == nil { | ||
| return desc, nil | ||
| } | ||
| if !errors.Is(err, errdef.ErrNotFound) { | ||
| return ocispec.Descriptor{}, err | ||
| } | ||
| lastErr = err | ||
| } | ||
| return ocispec.Descriptor{}, lastErr | ||
| } |