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moby--moby/libnetwork/resolvconf/utils.go

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package resolvconf
import (
"crypto/sha256"
"encoding/hex"
"io"
)
// hashData returns the sha256 sum of src.
func hashData(src io.Reader) (string, error) {
h := sha256.New()
if _, err := io.Copy(h, src); err != nil {
return "", err
}
return "sha256:" + hex.EncodeToString(h.Sum(nil)), nil
}