mirror of
https://github.com/mudler/luet.git
synced 2025-07-12 22:59:58 +00:00
68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// 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 crane
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import (
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"archive/tar"
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"bytes"
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"sort"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/empty"
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"github.com/google/go-containerregistry/pkg/v1/mutate"
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"github.com/google/go-containerregistry/pkg/v1/tarball"
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)
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// Layer creates a layer from a single file map. These layers are reproducible and consistent.
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// A filemap is a path -> file content map representing a file system.
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func Layer(filemap map[string][]byte) (v1.Layer, error) {
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b := &bytes.Buffer{}
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w := tar.NewWriter(b)
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fn := []string{}
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for f := range filemap {
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fn = append(fn, f)
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}
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sort.Strings(fn)
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for _, f := range fn {
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c := filemap[f]
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if err := w.WriteHeader(&tar.Header{
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Name: f,
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Size: int64(len(c)),
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}); err != nil {
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return nil, err
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}
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if _, err := w.Write(c); err != nil {
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return nil, err
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}
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}
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if err := w.Close(); err != nil {
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return nil, err
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}
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return tarball.LayerFromReader(b)
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}
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// Image creates a image with the given filemaps as its contents. These images are reproducible and consistent.
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// A filemap is a path -> file content map representing a file system.
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func Image(filemap map[string][]byte) (v1.Image, error) {
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y, err := Layer(filemap)
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if err != nil {
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return nil, err
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}
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return mutate.AppendLayers(empty.Image, y)
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}
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