[PATCH 3 of 6 V3] archive: migrate to the fileprefetch callback mechanism

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1518328183 18000
#      Sun Feb 11 00:49:43 2018 -0500
# Node ID 243fe0926905286bbce9078de38ea1565b03028a
# Parent  f5461e496adbb52ed35e71e8a00c9f0b6b5b9c0f
archive: migrate to the fileprefetch callback mechanism

diff --git a/mercurial/archival.py b/mercurial/archival.py
--- a/mercurial/archival.py
+++ b/mercurial/archival.py
@@ -22,6 +22,7 @@
     error,
     formatter,
     match as matchmod,
+    scmutil,
     util,
     vfs as vfsmod,
 )
@@ -338,7 +339,7 @@
     total = len(files)
     if total:
         files.sort()
-        cmdutil._prefetchfiles(repo, ctx, files)
+        scmutil.fileprefetchhooks(repo, ctx, files)
         repo.ui.progress(_('archiving'), 0, unit=_('files'), total=total)
         for i, f in enumerate(files):
             ff = ctx.flags(f)
diff --git a/mercurial/subrepo.py b/mercurial/subrepo.py
--- a/mercurial/subrepo.py
+++ b/mercurial/subrepo.py
@@ -556,7 +556,7 @@
             files = [f for f in files if match(f)]
         rev = self._state[1]
         ctx = self._repo[rev]
-        cmdutil._prefetchfiles(self._repo, ctx, files)
+        scmutil.fileprefetchhooks(self._repo, ctx, files)
         total = abstractsubrepo.archive(self, archiver, prefix, match)
         for subpath in ctx.substate:
             s = subrepo(ctx, subpath, True)