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43 lines
2.1 KiB
43 lines
2.1 KiB
1 year ago
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// Copyright 2018 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package name defines structured types for representing image references.
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//
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// What's in a name? For image references, not nearly enough!
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//
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// Image references look a lot like URLs, but they differ in that they don't
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// contain the scheme (http or https), they can end with a :tag or a @digest
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// (the latter being validated), and they perform defaulting for missing
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// components.
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//
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// Since image references don't contain the scheme, we do our best to infer
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// if we use http or https from the given hostname. We allow http fallback for
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// any host that looks like localhost (localhost, 127.0.0.1, ::1), ends in
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// ".local", or is in the "private" address space per RFC 1918. For everything
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// else, we assume https only. To override this heuristic, use the Insecure
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// option.
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//
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// Image references with a digest signal to us that we should verify the content
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// of the image matches the digest. E.g. when pulling a Digest reference, we'll
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// calculate the sha256 of the manifest returned by the registry and error out
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// if it doesn't match what we asked for.
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//
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// For defaulting, we interpret "ubuntu" as
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// "index.docker.io/library/ubuntu:latest" because we add the missing repo
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// "library", the missing registry "index.docker.io", and the missing tag
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// "latest". To disable this defaulting, use the StrictValidation option. This
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// is useful e.g. to only allow image references that explicitly set a tag or
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// digest, so that you don't accidentally pull "latest".
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package name
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