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readfiles.go
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/
readfiles.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package oci
import (
"archive/tar"
"io"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"namespacelabs.dev/foundation/internal/fnfs/tarfs"
)
func ImageAsFS(image v1.Image) tarfs.FS {
return tarfs.FS{TarStream: func() (io.ReadCloser, error) { return mutate.Extract(image), nil }}
}
func VisitFilesFromImage(img v1.Image, visitor func(layer, path string, typ byte, contents []byte) error) error {
layers, err := img.Layers()
if err != nil {
return err
}
for _, layer := range layers {
digest, err := layer.Digest()
if err != nil {
return err
}
r, err := layer.Uncompressed()
if err != nil {
return err
}
defer r.Close()
tr := tar.NewReader(r)
for {
h, err := tr.Next()
if err == io.EOF {
break
}
var contents []byte
if h.Typeflag == tar.TypeReg {
contents, err = io.ReadAll(tr)
if err != nil {
return err
}
} else if h.Typeflag == tar.TypeLink || h.Typeflag == tar.TypeSymlink {
contents = []byte(h.Linkname)
}
if err := visitor(digest.String(), h.Name, h.Typeflag, contents); err != nil {
return err
}
}
}
return nil
}