revert: allow configuring the .orig file location

mercurial/cmdutil.py

@@ -3082,7 +3082,7 b' def revert(ui, repo, ctx, parents, *pats'
                     xlist.append(abs)
                     if dobackup and (backup <= dobackup
                                      or wctx[abs].cmp(ctx[abs])):
-                            bakname = "%s.orig" % rel
+                            bakname = origpath(ui, repo, rel)
                             ui.note(_('saving current version of %s as %s\n') %
                                     (rel, bakname))
                             if not opts.get('dry_run'):

tests/test-revert.t

@@ -86,6 +86,16 b' Test creation of backup (.orig) files'
   saving current version of e as e.orig
   reverting e
 
+Test creation of backup (.orig) file in configured file location
+----------------------------------------------------------------
+
+  $ echo z > e
+  $ hg revert --all -v --config 'ui.origbackuppath=.hg/origbackups'
+  creating directory: $TESTTMP/repo/.hg/origbackups
+  saving current version of e as $TESTTMP/repo/.hg/origbackups/e.orig
+  reverting e
+  $ rm -rf .hg/origbackups
+
 revert on clean file (no change)
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