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I am already downloaded docker images by other tools.

it is possiable to add one images layer to docker?

direct copy it to /var/lib/docker/overlay2 ?

dowload file example:

> docker_pull.py  node
...
~/docker-drag/tmp_node_latest$ ls
819b8d6a0f6367138cb4eed4abbd3c01b64699001aaba31037584077b26e2b52
8200215dd1e2b384c4444b0bdafaf94044ed4286d7d68c62d32cdcd49b1a8216
93cbc70f645f4787918fb30634da8ea26e65fdae581fcff2510ec1be4ddad8c1
b8b32f5baa9203b12975c49e3f02b7fbefd6caae6df5ab598f9d3bad18c576ac
d2850632b60222a2c2a4848d6482d69e26435be1718c8de1f946d1f597117133.json
...

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