[PATCH stable?] import: respect diff.noprefix config (issue4639)

[Matt Mackall]

On Fri, 2016-01-22 at 10:43 -0800, Siddharth Agarwal wrote:
> On 1/22/16 06:51, Ryan McElroy wrote:
> > # HG changeset patch
> > # User Ryan McElroy <rmcelroy at fb.com>
> > # Date 1453473839 28800
> > #      Fri Jan 22 06:43:59 2016 -0800
> > # Branch stable
> > # Node ID 40555a31b98b027c91b1ccf61477151b3307deb2
> > # Parent  158bdc8965720ca4061f8f8d806563cfc7cdb62e
> > import: respect diff.noprefix config (issue4639)
> > 
> > Previously export-import round-trips would not work if diff.nopreofix was
> > truthy, because import did not pay attention to that setting. Now we inspect
> > that setting unless an explicit strip level is specified.
> 
> I don't think this is the right solution here -- much of the time hg 
> import is used on a repository that's different from the one where hg 
> export was used. Could we figure out from the patch whether to use -p0 
> or -p1?

In fact I asked Sid to do the above when he added noprefix, so I still favor
this method. Detecting the lack of a/b prefixes is only a little tricky (you
have to consider the case of the repo which actually has "a" or "b" as directory
names).

But I don't think this is freeze-appropriate.

-- 
Mathematics is the supreme nostalgia of our time.