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�r�|dk�s |d |k �r(|dk�r(|�r t�d|� t#�$|� W Y d} ~ q�d} ~ 0 0 q�|d �dS )a+ Wrapper around requests.Session to read the url and retry if necessary
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:param headers_cb: Optional callable returning a dict of values to send as
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cert_file keys for use on in ssl connections.
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msg and exception and returns a boolean True if retries are permitted.
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:param infinite: Bool, set True to retry indefinitely. Default: False.
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the idea of this routine is to wait for the EC2 metadata service to
come up. On both Eucalyptus and EC2 we have seen the case where
the instance hit the MD before the MD service was up. EC2 seems
to have permanently fixed this, though.
In openstack, the metadata service might be painfully slow, and
unable to avoid hitting a timeout of even up to 10 seconds or more
(LP: #894279) for a simple GET.
Offset those needs with the need to not hang forever (and block boot)
on a system where cloud-init is configured to look for EC2 Metadata
service but is not going to find one. It is possible that the instance
data host (169.254.169.254) may be firewalled off Entirely for a system,
meaning that the connection will block forever unless a timeout is set.
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