Support images larger than 2GiB in docker_session.upload()

[eshiroma]

This library has been extremely useful for jobs that run docker commands!

One such job recently started failing with OverflowError: string longer than 2147483647 bytes when it tried to copy a 2.6GB image.

I'm sure that there are reasons behind the 2GiB limit, but would it be possible to increase this limit? (e.g. to 4GiB or 8GiB)

[eshiroma]

It looks like the root cause of the library failure is the limitation of the SSL wrapped HTTP client - a similar issue discussed at https://github.com/psf/requests/issues/2717

[Bevisy]

When I upload an image larger than 2GiB, I see that the reason is that zlib.crc32() does not support more than (2^32-1) bytes in python version 2.7.5, resulting in an error.zlib.crc32() is called here https://github.com/google/containerregistry/blob/8a11dc8c53003ecf5b72ffaf035ba280109356ac/client/v2_2/docker_image_.py#L461

$ python2 -c "import zlib;zlib.crc32('a'*(1<<31))"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
OverflowError: size does not fit in an int

This means that the size of the uploaded image should not exceed 2GiB per layer. We should upgrade python2 to 2.7.18 or python3

[jonjohnsonjr]

We should upgrade python2 to 2.7.18 or python3

You're saying this is fixed with just a version bump?