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package path
import (
"fmt"
"path/filepath"
"github.com/opencontainers/go-digest"
)
// CleanAbsPath removes any ".." and "." from the path
// and ensures it starts with a "/". If the path refers to the root
// directory, it returns "/".
func CleanAbsPath(path string) string {
return filepath.Clean("/" + path)
}
// RegularFilePath returns the path used in the composefs backing store for a
// regular file with the provided content digest.
//
// The caller MUST ensure d is a valid digest (in particular, that it contains no path separators or .. entries)
func RegularFilePathForValidatedDigest(d digest.Digest) (string, error) {
if algo := d.Algorithm(); algo != digest.SHA256 {
return "", fmt.Errorf("unexpected digest algorithm %q", algo)
}
e := d.Encoded()
return e[0:2] + "/" + e[2:], nil
}
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