[PATCH 7 of 7] largefiles: use readasstandin() to read hex hash directly from filectx

[Yuya Nishihara]

On Sat, 01 Apr 2017 02:41:52 +0900, FUJIWARA Katsunori wrote:
> # HG changeset patch
> # User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
> # Date 1490981569 -32400
> #      Sat Apr 01 02:32:49 2017 +0900
> # Node ID bd7e74372d5d3763b38717159a805cf557b07604
> # Parent  89507622f5b4cb8b8e9f99a02db43b64f10d95f3
> largefiles: use readasstandin() to read hex hash directly from filectx

Queued, thanks.

> BTW, C implementation of hexdigest() for SHA-1/256/512 returns hex
> hash in lower case, and doctest in Python standard hashlib assumes
> that, too. But it isn't explicitly described in API document or so.
> 
> Therefore, we can't assume that hexdigest() always returns hex hash in
> lower case, for any hash algorithms, on any Python runtimes and
> versions.

[...]

We'll need to stop using .hexdigest() for Py3 compatibility anyway, and
use node.hex() instead. node.hex() isn't documented to return lowercase
hex, but everything would be broken if it doesn't.