tests: stabilize test-persistent-nodemap.t on Windows Several issues here: - Hooks can't invoke shell scripts on Windows, so use `sh` to launch - `dd` in MSYS only recognizes `status=noxfer` - The `PATH` updating triggered a massive slowdown, but is no longer needed I have no idea why, but removing the `PATH` update substantially increased the speed of the test. It was running finishing at ~4:30 with `--debug` and ~14:50 without it, but now completes in ~2:20 on my Windows laptop. Differential Revision: https://phab.mercurial-scm.org/D10636

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# extension to emulate interrupting filemerge._filemerge

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from __future__ import absolute_import

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from mercurial import (

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    error,

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    extensions,

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    filemerge,

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)

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def failfilemerge(

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    filemergefn, premerge, repo, wctx, mynode, orig, fcd, fco, fca, labels=None

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):

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    raise error.Abort(b"^C")

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    return filemergefn(premerge, repo, mynode, orig, fcd, fco, fca, labels)

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def extsetup(ui):

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    extensions.wrapfunction(filemerge, '_filemerge', failfilemerge)