[PATCH windows] windows: add an experimental option for long paths support

[Pulkit Goyal]

On Tue, Oct 10, 2017 at 5:39 AM Matt Harbison <mharbison72 at gmail.com> wrote:

> On Mon, 09 Oct 2017 05:38:04 -0400, Kostia Balytskyi <ikostia at fb.com>
> wrote:
>
> > # HG changeset patch
> > # User Kostia Balytskyi <ikostia at fb.com>
> > # Date 1507541423 25200
> > #      Mon Oct 09 02:30:23 2017 -0700
> > # Node ID aa5c7de6a86ba8bbc7d46bb414ac7ee6fbde3a4a
> > # Parent  a57c938e7ac8f391a62de6c7c4d5cf0e81b2dcf4
> > windows: add an experimental option for long paths support
> >
> > +
> > +    def addlongpathsmanifest(self):
> > +        """Add manifest pieces so that hg.exe understands long paths
> > +
> > +        This is an EXPERIMENTAL feature, use with care.
> > +        To enable long paths support, one needs to do two things:
> > +        - build Mercurial with --long-paths-support option
> > +        - change HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\
> > +                 LongPathsEnabled to have value 1.
>
> The way I read the documentation[1], it seems like either one alone is
> sufficient.  Did you find different in testing?
>
> [1]
> https://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx#maxpath


I stumbled upon the same thing today. Then I read the 9th comment on
https://social.msdn.microsoft.com/Forums/en-US/fc85630e-5684-4df6-ad2f-5a128de3deef/260-character-explorer-path-length-limit?forum=windowsgeneraldevelopmentissues
which says you need to have the support enabled and also add the manifest
to hg.exe.

Matt any chance you checked whether we need the manifest or just enabling
the long path support on windows will work.
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