changelog: add a method to get public/draft nodes from remotenames

Summary:
One step towards redefining heads with remote heads.

Debugshell was teached to skip IPython for non-interactive input.

(For some reason most part of this diff got folded into the previous one)

Reviewed By: sfilipco

Differential Revision: D17199842

fbshipit-source-id: 1594658e3e5f2f2c51f817bc1074d28329df7786

tests/test-changelog-remoteheads-t.py

@@ -0,0 +1,51 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from __future__ import absolute_import
+
+from testutil.dott import feature, sh, testtmp  # noqa: F401
+
+
+sh.enable("remotenames")
+sh.setconfig("infinitepush.branchpattern=re:draft.*")
+
+sh.newrepo("server")
+sh.setconfig("treemanifest.server=1")
+
+sh % "drawdag" << r"""
+B C
+|/
+A
+"""
+
+sh % "hg log -Gr 'all()' -T '{desc} {node}'" == r"""
+    o  C dc0947a82db884575bb76ea10ac97b08536bfa03
+    |
+    | o  B 112478962961147124edd43549aedd1a335e44bf
+    |/
+    o  A 426bada5c67598ca65036d57d9e4b64b0c1ce7a0"""
+
+sh % "hg book -r '$A' book/a"
+sh % "hg book -r '$B' book/b"
+sh % "hg book -r '$C' draft/c"
+
+sh % "cd '$TESTTMP'"
+sh % "hg clone -q --pull server client"
+sh % "cd client"
+
+sh % "hg pull -qr book/a"
+sh % "hg pull -qr draft/c"
+
+sh % "hg dbsh -y" << r"""
+publicnodes, draftnodes = cl._remotenodes()
+hex = m.node.hex
+for node in sorted(publicnodes):
+    ui.write("public %s\n" % hex(node))
+for node in draftnodes:
+    ui.write("draft  %s\n" % hex(node))
+""" == r"""
+    public 112478962961147124edd43549aedd1a335e44bf
+    public 426bada5c67598ca65036d57d9e4b64b0c1ce7a0
+    draft  dc0947a82db884575bb76ea10ac97b08536bfa03"""