hgserver: add test for fastannotate (bug 1504794); r=sheehan

fastannotate has broken before. Let's add test coverage to ensure
it continues to work.

We already have a helper script in the test environment to set hgrc
options. However, it doesn't work with %include, which is a special
directive. Rather than complicate that script with %include
functionality, I wrote a simple, non-generic script to accomplish
what we need.

Differential Revision: https://phabricator.services.mozilla.com/D11131

--HG--
extra : moz-landing-system : lando

ansible/roles/docker-hg-web/files/enable-fastannotate

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3.6
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+
+repo = sys.argv[1]
+
+with open(os.path.join(repo, '.hg', 'hgrc'), 'ab') as fh:
+    fh.write(b'\n%include /etc/mercurial/hgrc-fastannotate\n')

ansible/roles/docker-hg-web/tasks/main.yml

@@ -35,6 +35,7 @@
 - name: install Docker support files
   copy: src={{ item }} dest=/{{ item }} owner=root group=root mode=0755
   with_items:
+    - enable-fastannotate
     - entrypoint.py
     - entrypoint-solo
     - set-config-option

hgserver/tests/test-fastannotate.t

@@ -0,0 +1,60 @@
+#require hgmodocker
+
+  $ . $TESTDIR/hgserver/tests/helpers.sh
+  $ hgmoenv
+  $ standarduser
+
+  $ hgmo create-repo mozilla-central scm_level_1
+  (recorded repository creation in replication log)
+  $ hgmo exec hgweb0 /var/hg/venv_replication/bin/vcsreplicator-consumer --wait-for-no-lag /etc/mercurial/vcsreplicator.ini
+  $ hgmo exec hgweb0 /enable-fastannotate /repo/hg/mozilla/mozilla-central
+
+  $ hg -q clone ssh://$SSH_SERVER:$HGPORT/mozilla-central
+  $ cd mozilla-central
+  $ cat > foo << EOF
+  > line0
+  > line1
+  > line2
+  > line3
+  > EOF
+  $ hg add foo
+  $ hg commit -m 'commit 1'
+  $ cat > foo << EOF
+  > line0
+  > line1 modified
+  > line2
+  > line3
+  > EOF
+  $ hg commit -m 'commit 2'
+  $ cat > foo << EOF
+  > line0
+  > line1 modified
+  > line2 modified
+  > line3
+  > EOF
+  $ hg commit -m 'commit 3'
+  $ hg -q push
+
+  $ hgmo exec hgweb0 /var/hg/venv_replication/bin/vcsreplicator-consumer --wait-for-no-lag /etc/mercurial/vcsreplicator.ini
+
+  $ http ${HGWEB_0_URL}mozilla-central/annotate/f01fe54ccaa1/foo | grep '<pre>'
+  <td class="followlines-btn-parent"><pre><a class="linenr" href="#l1">     1</a></pre></td>
+  <td><pre>line0
+  <td class="followlines-btn-parent"><pre><a class="linenr" href="#l2">     2</a></pre></td>
+  <td><pre>line1 modified
+  <td class="followlines-btn-parent"><pre><a class="linenr" href="#l3">     3</a></pre></td>
+  <td><pre>line2
+  <td class="followlines-btn-parent"><pre><a class="linenr" href="#l4">     4</a></pre></td>
+  <td><pre>line3
+
+  $ hgmo exec hgweb0 /var/hg/venv_hgweb/bin/hg --cwd /repo/hg/mozilla/mozilla-central --config fastannotate.modes=fastannotate fastannotate -r f01fe54ccaa1 foo
+  0: line0
+  1: line1 modified
+  0: line2
+  0: line3
+
+  $ hgmo exec hgweb0 ls /repo/hg/mozilla/mozilla-central/.hg/fastannotate/default
+  foo.l
+  foo.m
+
+  $ hgmo clean