packaging: stage files and dynamically generate WiX installer

Like we did for Inno, we want to make the WiX installer
"dumb" and simply consume source files from a directory
tree rather than have to define every single file in
installer files. This will greatly decrease the amount of
effort required to maintain the WiX installer since we don't
have to think that much about keeping files in sync.

This commit changes the WiX packager to populate a staging
directory as part of packaging. After it does so, it scans
that directory and dynamically generates WiX XML defining the
content within.

The IDs and GUIDs being generated are deterministic. So,
upgrades should work as expected in Windows Installer land.
(WiX has a "heat" tool that can generate XML by walking the
filesystem but it doesn't have this deterministic property,
sadly.)

As part of this change, GUIDs are now effectively reset.
So the next upgrade should be a complete wipe and replace.
This could potentially cause issues. But in my local testing,
I was able to upgrade an existing 5.1.2 install without
issue.

Compared to the previous commit, the installed files differ
in the following:

* A ReleaseNotes.txt file is now included
* A hgrc.d/editor.rc file is now generated (mercurial.rc has been
  updated to reflect this logical change to the content source)
* All files are marked as read-only. Previously, only a subset
  of files were. This should help prevent unwanted tampering.
  Although we may want to consider use cases like modifying
  template files...

This change also means that Inno and WiX are now using very
similar code for managing the install layout. This means
that on disk both packages are nearly identical. The
differences in install layout are as follows:

* Inno has a Copying.txt vs a COPYING.rtf for WiX.
  (The WiX installer wants to use RTF.)
* Inno has a Mercurial.url file that is an internet shortcut
  to www.mercurial-scm.org. (This could potentially be
  removed.)
* Inno includes msvc[mpr]90.dll files and WiX does not.
  (WiX installs the MSVC runtime via merge modules.)
* Inno includes unins000.{dat,exe} files. (WiX's state is
  managed by Windows Installer, which places things elsewhere.)

Because file lists are dynamically generated now, the test
ensuring things remain in sync has been deleted. Good riddance.

While this is a huge step towards unifying the Windows installers,
there's still some improvements that can be made. But I think
it is worth celebrating the milestone of getting both Inno
and WiX to essentially share core packaging code and workflows.
That should make it much easier to change the installers going
forward. This will aid support of Python 3.

Differential Revision: https://phab.mercurial-scm.org/D7173

contrib/packaging/hgpackaging/py2exe.py

@@ -209,13 +209,26 b' def build_py2exe('
     )
 
 
-def stage_install(source_dir: pathlib.Path, staging_dir: pathlib.Path):
+def stage_install(
+    source_dir: pathlib.Path, staging_dir: pathlib.Path, lower_case=False
+):
     """Copy all files to be installed to a directory.
 
     This allows packaging to simply walk a directory tree to find source
     files.
     """
-    process_install_rules(STAGING_RULES, source_dir, staging_dir)
+    if lower_case:
+        rules = []
+        for source, dest in STAGING_RULES:
+            # Only lower directory names.
+            if '/' in dest:
+                parent, leaf = dest.rsplit('/', 1)
+                dest = '%s/%s' % (parent.lower(), leaf)
+            rules.append((source, dest))
+    else:
+        rules = STAGING_RULES
+
+    process_install_rules(rules, source_dir, staging_dir)
 
     # Write out a default editor.rc file to configure notepad as the
     # default editor.

contrib/packaging/hgpackaging/wix.py

@@ -7,38 +7,60 b''
 
 # no-check-code because Python 3 native.
 
+import collections
 import os
 import pathlib
 import re
+import shutil
 import subprocess
-import tempfile
 import typing
+import uuid
 import xml.dom.minidom
 
 from .downloads import download_entry
-from .py2exe import build_py2exe
+from .py2exe import (
+    build_py2exe,
+    stage_install,
+)
 from .util import (
     extract_zip_to_directory,
+    process_install_rules,
     sign_with_signtool,
 )
 
 
-SUPPORT_WXS = [
-    ('contrib.wxs', r'contrib'),
-    ('dist.wxs', r'dist'),
-    ('doc.wxs', r'doc'),
-    ('help.wxs', r'mercurial\help'),
-    ('locale.wxs', r'mercurial\locale'),
-    ('templates.wxs', r'mercurial\templates'),
-]
-
-
 EXTRA_PACKAGES = {
     'distutils',
     'pygments',
 }
 
 
+EXTRA_INSTALL_RULES = [
+    ('contrib/packaging/wix/COPYING.rtf', 'COPYING.rtf'),
+    ('contrib/win32/mercurial.ini', 'hgrc.d/mercurial.rc'),
+]
+
+STAGING_REMOVE_FILES = [
+    # We use the RTF variant.
+    'copying.txt',
+]
+
+SHORTCUTS = {
+    # hg.1.html'
+    'hg.file.5d3e441c_28d9_5542_afd0_cdd4234f12d5': {
+        'Name': 'Mercurial Command Reference',
+    },
+    # hgignore.5.html
+    'hg.file.5757d8e0_f207_5e10_a2ec_3ba0a062f431': {
+        'Name': 'Mercurial Ignore Files',
+    },
+    # hgrc.5.html
+    'hg.file.92e605fd_1d1a_5dc6_9fc0_5d2998eb8f5e': {
+        'Name': 'Mercurial Configuration Files',
+    },
+}
+
+
 def find_version(source_dir: pathlib.Path):
     version_py = source_dir / 'mercurial' / '__version__.py'
 
@@ -147,49 +169,165 b' def make_post_build_signing_fn('
     return post_build_sign
 
 
-LIBRARIES_XML = '''
-<?xml version="1.0" encoding="utf-8"?>
-<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
-
-  <?include {wix_dir}/guids.wxi ?>
-  <?include {wix_dir}/defines.wxi ?>
+def make_files_xml(staging_dir: pathlib.Path, is_x64) -> str:
+    """Create XML string listing every file to be installed."""
 
-  <Fragment>
-    <DirectoryRef Id="INSTALLDIR" FileSource="$(var.SourceDir)">
-      <Directory Id="libdir" Name="lib" FileSource="$(var.SourceDir)/lib">
-        <Component Id="libOutput" Guid="$(var.lib.guid)" Win64='$(var.IsX64)'>
-        </Component>
-      </Directory>
-    </DirectoryRef>
-  </Fragment>
-</Wix>
-'''.lstrip()
+    # We derive GUIDs from a deterministic file path identifier.
+    # We shoehorn the name into something that looks like a URL because
+    # the UUID namespaces are supposed to work that way (even though
+    # the input data probably is never validated).
 
-
-def make_libraries_xml(wix_dir: pathlib.Path, dist_dir: pathlib.Path):
-    """Make XML data for library components WXS."""
-    # We can't use ElementTree because it doesn't handle the
-    # <?include ?> directives.
     doc = xml.dom.minidom.parseString(
-        LIBRARIES_XML.format(wix_dir=str(wix_dir))
+        '<?xml version="1.0" encoding="utf-8"?>'
+        '<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">'
+        '</Wix>'
     )
 
-    component = doc.getElementsByTagName('Component')[0]
+    # Assemble the install layout by directory. This makes it easier to
+    # emit XML, since each directory has separate entities.
+    manifest = collections.defaultdict(dict)
+
+    for root, dirs, files in os.walk(staging_dir):
+        dirs.sort()
+
+        root = pathlib.Path(root)
+        rel_dir = root.relative_to(staging_dir)
+
+        for i in range(len(rel_dir.parts)):
+            parent = '/'.join(rel_dir.parts[0 : i + 1])
+            manifest.setdefault(parent, {})
+
+        for f in sorted(files):
+            full = root / f
+            manifest[str(rel_dir).replace('\\', '/')][full.name] = full
+
+    component_groups = collections.defaultdict(list)
+
+    # Now emit a <Fragment> for each directory.
+    # Each directory is composed of a <DirectoryRef> pointing to its parent
+    # and defines child <Directory>'s and a <Component> with all the files.
+    for dir_name, entries in sorted(manifest.items()):
+        # The directory id is derived from the path. But the root directory
+        # is special.
+        if dir_name == '.':
+            parent_directory_id = 'INSTALLDIR'
+        else:
+            parent_directory_id = 'hg.dir.%s' % dir_name.replace('/', '.')
 
-    f = doc.createElement('File')
-    f.setAttribute('Name', 'library.zip')
-    f.setAttribute('KeyPath', 'yes')
-    component.appendChild(f)
+        fragment = doc.createElement('Fragment')
+        directory_ref = doc.createElement('DirectoryRef')
+        directory_ref.setAttribute('Id', parent_directory_id)
+
+        # Add <Directory> entries for immediate children directories.
+        for possible_child in sorted(manifest.keys()):
+            if (
+                dir_name == '.'
+                and '/' not in possible_child
+                and possible_child != '.'
+            ):
+                child_directory_id = 'hg.dir.%s' % possible_child
+                name = possible_child
+            else:
+                if not possible_child.startswith('%s/' % dir_name):
+                    continue
+                name = possible_child[len(dir_name) + 1 :]
+                if '/' in name:
+                    continue
+
+                child_directory_id = 'hg.dir.%s' % possible_child.replace(
+                    '/', '.'
+                )
+
+            directory = doc.createElement('Directory')
+            directory.setAttribute('Id', child_directory_id)
+            directory.setAttribute('Name', name)
+            directory_ref.appendChild(directory)
+
+        # Add <Component>s for files in this directory.
+        for rel, source_path in sorted(entries.items()):
+            if dir_name == '.':
+                full_rel = rel
+            else:
+                full_rel = '%s/%s' % (dir_name, rel)
 
-    lib_dir = dist_dir / 'lib'
+            component_unique_id = (
+                'https://www.mercurial-scm.org/wix-installer/0/component/%s'
+                % full_rel
+            )
+            component_guid = uuid.uuid5(uuid.NAMESPACE_URL, component_unique_id)
+            component_id = 'hg.component.%s' % str(component_guid).replace(
+                '-', '_'
+            )
+
+            component = doc.createElement('Component')
+
+            component.setAttribute('Id', component_id)
+            component.setAttribute('Guid', str(component_guid).upper())
+            component.setAttribute('Win64', 'yes' if is_x64 else 'no')
+
+            # Assign this component to a top-level group.
+            if dir_name == '.':
+                component_groups['ROOT'].append(component_id)
+            elif '/' in dir_name:
+                component_groups[dir_name[0 : dir_name.index('/')]].append(
+                    component_id
+                )
+            else:
+                component_groups[dir_name].append(component_id)
+
+            unique_id = (
+                'https://www.mercurial-scm.org/wix-installer/0/%s' % full_rel
+            )
+            file_guid = uuid.uuid5(uuid.NAMESPACE_URL, unique_id)
+
+            # IDs have length limits. So use GUID to derive them.
+            file_guid_normalized = str(file_guid).replace('-', '_')
+            file_id = 'hg.file.%s' % file_guid_normalized
 
-    for p in sorted(lib_dir.iterdir()):
-        if not p.name.endswith(('.dll', '.pyd')):
-            continue
+            file_element = doc.createElement('File')
+            file_element.setAttribute('Id', file_id)
+            file_element.setAttribute('Source', str(source_path))
+            file_element.setAttribute('KeyPath', 'yes')
+            file_element.setAttribute('ReadOnly', 'yes')
+
+            component.appendChild(file_element)
+            directory_ref.appendChild(component)
+
+        fragment.appendChild(directory_ref)
+        doc.documentElement.appendChild(fragment)
+
+    for group, component_ids in sorted(component_groups.items()):
+        fragment = doc.createElement('Fragment')
+        component_group = doc.createElement('ComponentGroup')
+        component_group.setAttribute('Id', 'hg.group.%s' % group)
+
+        for component_id in component_ids:
+            component_ref = doc.createElement('ComponentRef')
+            component_ref.setAttribute('Id', component_id)
+            component_group.appendChild(component_ref)
 
-        f = doc.createElement('File')
-        f.setAttribute('Name', p.name)
-        component.appendChild(f)
+        fragment.appendChild(component_group)
+        doc.documentElement.appendChild(fragment)
+
+    # Add <Shortcut> to files that have it defined.
+    for file_id, metadata in sorted(SHORTCUTS.items()):
+        els = doc.getElementsByTagName('File')
+        els = [el for el in els if el.getAttribute('Id') == file_id]
+
+        if not els:
+            raise Exception('could not find File[Id=%s]' % file_id)
+
+        for el in els:
+            shortcut = doc.createElement('Shortcut')
+            shortcut.setAttribute('Id', 'hg.shortcut.%s' % file_id)
+            shortcut.setAttribute('Directory', 'ProgramMenuDir')
+            shortcut.setAttribute('Icon', 'hgIcon.ico')
+            shortcut.setAttribute('IconIndex', '0')
+            shortcut.setAttribute('Advertise', 'yes')
+            for k, v in sorted(metadata.items()):
+                shortcut.setAttribute(k, v)
+
+            el.appendChild(shortcut)
 
     return doc.toprettyxml()
 
@@ -248,9 +386,27 b' def build_installer('
         post_build_fn(source_dir, hg_build_dir, dist_dir, version)
 
     build_dir = hg_build_dir / ('wix-%s' % arch)
+    staging_dir = build_dir / 'stage'
 
     build_dir.mkdir(exist_ok=True)
 
+    # Purge the staging directory for every build so packaging is pristine.
+    if staging_dir.exists():
+        print('purging %s' % staging_dir)
+        shutil.rmtree(staging_dir)
+
+    stage_install(source_dir, staging_dir, lower_case=True)
+
+    # We also install some extra files.
+    process_install_rules(EXTRA_INSTALL_RULES, source_dir, staging_dir)
+
+    # And remove some files we don't want.
+    for f in STAGING_REMOVE_FILES:
+        p = staging_dir / f
+        if p.exists():
+            print('removing %s' % p)
+            p.unlink()
+
     wix_pkg, wix_entry = download_entry('wix', hg_build_dir)
     wix_path = hg_build_dir / ('wix-%s' % wix_entry['version'])
 
@@ -263,25 +419,16 b' def build_installer('
 
     defines = {'Platform': arch}
 
-    for wxs, rel_path in SUPPORT_WXS:
-        wxs = wix_dir / wxs
-        wxs_source_dir = source_dir / rel_path
-        run_candle(wix_path, build_dir, wxs, wxs_source_dir, defines=defines)
+    # Derive a .wxs file with the staged files.
+    manifest_wxs = build_dir / 'stage.wxs'
+    with manifest_wxs.open('w', encoding='utf-8') as fh:
+        fh.write(make_files_xml(staging_dir, is_x64=arch == 'x64'))
+
+    run_candle(wix_path, build_dir, manifest_wxs, staging_dir, defines=defines)
 
     for source, rel_path in sorted((extra_wxs or {}).items()):
         run_candle(wix_path, build_dir, source, rel_path, defines=defines)
 
-    # candle.exe doesn't like when we have an open handle on the file.
-    # So use TemporaryDirectory() instead of NamedTemporaryFile().
-    with tempfile.TemporaryDirectory() as td:
-        td = pathlib.Path(td)
-
-        tf = td / 'library.wxs'
-        with tf.open('w') as fh:
-            fh.write(make_libraries_xml(wix_dir, dist_dir))
-
-        run_candle(wix_path, build_dir, tf, dist_dir, defines=defines)
-
     source = wix_dir / 'mercurial.wxs'
     defines['Version'] = version
     defines['Comments'] = 'Installs Mercurial version %s' % version
@@ -307,20 +454,13 b' def build_installer('
         str(msi_path),
     ]
 
-    for source, rel_path in SUPPORT_WXS:
-        assert source.endswith('.wxs')
-        args.append(str(build_dir / ('%s.wixobj' % source[:-4])))
-
     for source, rel_path in sorted((extra_wxs or {}).items()):
         assert source.endswith('.wxs')
         source = os.path.basename(source)
         args.append(str(build_dir / ('%s.wixobj' % source[:-4])))
 
     args.extend(
-        [
-            str(build_dir / 'library.wixobj'),
-            str(build_dir / 'mercurial.wixobj'),
-        ]
+        [str(build_dir / 'stage.wixobj'), str(build_dir / 'mercurial.wixobj'),]
     )
 
     subprocess.run(args, cwd=str(source_dir), check=True)

contrib/packaging/wix/guids.wxi

@@ -4,46 +4,9 b''
        and replace 'Mercurial' in this notice with the name of
        your project. Component GUIDs have global namespace!      -->
 
-  <!-- contrib.wxs -->
-  <?define contrib.guid = {4E11FFC2-E2F7-482A-8460-9394B5489F02} ?>
-  <?define contrib.vim.guid = {BB04903A-652D-4C4F-9590-2BD07A2304F2} ?>
-
-  <!-- dist.wxs -->
-  <?define dist.guid = {CE405FE6-CD1E-4873-9C9A-7683AE5A3D90} ?>
-  <?define lib.guid = {877633b5-0b7e-4b46-8f1c-224a61733297} ?>
-
-  <!-- doc.wxs -->
-  <?define doc.hg.1.html.guid = {AAAA3FDA-EDC5-4220-B59D-D342722358A2} ?>
-  <?define doc.hgignore.5.html.guid = {AA9118C4-F3A0-4429-A5F4-5A1906B2D67F} ?>
-  <?define doc.hgrc.5.html = {E0CEA1EB-FA01-408c-844B-EE5965165BAE} ?>
-  <?define doc.style.css = {172F8262-98E0-4711-BD39-4DAE0D77EF05} ?>
-
-  <!-- help.wxs -->
-  <?define help.root.guid = {9FA957DB-6DFE-44f2-AD03-293B2791CF17} ?>
-  <?define help.internals.guid = {2DD7669D-0DB8-4C39-9806-78E6475E7ACC} ?>
-
-  <!-- templates.wxs -->
-  <?define templates.root.guid = {437FD55C-7756-4EA0-87E5-FDBE75DC8595} ?>
-  <?define templates.atom.guid = {D30E14A5-8AF0-4268-8B00-00BEE9E09E39} ?>
-  <?define templates.coal.guid = {B63CCAAB-4EAF-43b4-901E-4BD13F5B78FC} ?>
-  <?define templates.gitweb.guid = {827334AF-1EFD-421B-962C-5660A068F612} ?>
-  <?define templates.json.guid = {F535BE7A-EC34-46E0-B9BE-013F3DBAFB19} ?>
-  <?define templates.monoblue.guid = {8060A1E4-BD4C-453E-92CB-9536DC44A9E3} ?>
-  <?define templates.paper.guid = {61AB1DE9-645F-46ED-8AF8-0CF02267FFBB} ?>
-  <?define templates.raw.guid = {834DF8D7-9784-43A6-851D-A96CE1B3575B} ?>
-  <?define templates.rss.guid = {9338FA09-E128-4B1C-B723-1142DBD09E14} ?>
-  <?define templates.spartan.guid = {80222625-FA8F-44b1-86CE-1781EF375D09} ?>
-  <?define templates.static.guid = {6B3D7C24-98DA-4B67-9F18-35F77357B0B4} ?>
-
   <!-- mercurial.wxs -->
   <?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
-
   <?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
-
-  <?define ReadMe.guid = {56A8E372-991D-4DCA-B91D-93D775974CF5} ?>
-  <?define COPYING.guid = {B7801DBA-1C49-4BF4-91AD-33C65F5C7895} ?>
-  <?define mercurial.rc.guid = {52BBF223-58F6-47F5-9353-8FDEA88D9B8D} ?>
-  <?define mergetools.rc.guid = {5AF0430B-2B76-4BC6-91EE-E771B74A0214} ?>
   <?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
 
 </Include>

contrib/packaging/wix/mercurial.wxs

@@ -60,30 +60,10 b''
       <Directory Id='$(var.PFolder)' Name='PFiles'>
         <Directory Id='INSTALLDIR' Name='Mercurial'>
           <Component Id='MainExecutable' Guid='$(var.ComponentMainExecutableGUID)' Win64='$(var.IsX64)'>
-            <File Id='hgEXE' Name='hg.exe' Source='dist\hg.exe' KeyPath='yes' />
+            <CreateFolder />
             <Environment Id="Environment" Name="PATH" Part="last" System="yes"
                          Permanent="no" Value="[INSTALLDIR]" Action="set" />
           </Component>
-          <Component Id='ReadMe' Guid='$(var.ReadMe.guid)' Win64='$(var.IsX64)'>
-              <File Id='ReadMe' Name='ReadMe.html' Source='contrib\win32\ReadMe.html'
-                    KeyPath='yes'/>
-          </Component>
-          <Component Id='COPYING' Guid='$(var.COPYING.guid)' Win64='$(var.IsX64)'>
-            <File Id='COPYING' Name='COPYING.rtf' Source='contrib\packaging\wix\COPYING.rtf'
-                  KeyPath='yes'/>
-          </Component>
-
-          <Directory Id='HGRCD' Name='hgrc.d'>
-            <Component Id='mercurial.rc' Guid='$(var.mercurial.rc.guid)' Win64='$(var.IsX64)'>
-              <File Id='mercurial.rc' Name='mercurial.rc' Source='contrib\win32\mercurial.ini'
-                    ReadOnly='yes' KeyPath='yes'/>
-            </Component>
-            <Component Id='mergetools.rc' Guid='$(var.mergetools.rc.guid)' Win64='$(var.IsX64)'>
-              <File Id='mergetools.rc' Name='mergetools.rc' Source='mercurial\default.d\mergetools.rc'
-                    ReadOnly='yes' KeyPath='yes'/>
-            </Component>
-          </Directory>
-
         </Directory>
       </Directory>
 
@@ -117,15 +97,12 b''
       <Feature Id='MainProgram' Title='Program' Description='Mercurial command line app'
              Level='1' Absent='disallow' >
         <ComponentRef Id='MainExecutable' />
-        <ComponentRef Id='distOutput' />
-        <ComponentRef Id='libOutput' />
         <ComponentRef Id='ProgramMenuDir' />
-        <ComponentRef Id='ReadMe' />
-        <ComponentRef Id='COPYING' />
-        <ComponentRef Id='mercurial.rc' />
-        <ComponentRef Id='mergetools.rc' />
-        <ComponentGroupRef Id='helpFolder' />
-        <ComponentGroupRef Id='templatesFolder' />
+        <ComponentGroupRef Id="hg.group.ROOT" />
+        <ComponentGroupRef Id="hg.group.hgrc.d" />
+        <ComponentGroupRef Id="hg.group.help" />
+        <ComponentGroupRef Id="hg.group.lib" />
+        <ComponentGroupRef Id="hg.group.templates" />
         <MergeRef Id='VCRuntime' />
         <MergeRef Id='VCRuntimePolicy' />
       </Feature>
@@ -135,13 +112,13 b''
         <?endforeach?>
       <?endif?>
       <Feature Id='Locales' Title='Translations' Description='Translations' Level='1'>
-        <ComponentGroupRef Id='localeFolder' />
+        <ComponentGroupRef Id="hg.group.locale" />
       </Feature>
       <Feature Id='Documentation' Title='Documentation' Description='HTML man pages' Level='1'>
-        <ComponentGroupRef Id='docFolder' />
+        <ComponentGroupRef Id="hg.group.doc" />
       </Feature>
       <Feature Id='Misc' Title='Miscellaneous' Description='Contributed scripts' Level='1'>
-        <ComponentGroupRef Id='contribFolder' />
+        <ComponentGroupRef Id="hg.group.contrib" />
       </Feature>
     </Feature>
 

contrib/win32/mercurial.ini

@@ -16,7 +16,7 b''
 
 [ui]
 ; editor used to enter commit logs, etc.  Most text editors will work.
-editor = notepad
+; editor = notepad
 ; show changed files and be a bit more verbose if True
 ; verbose = True
 ; colorize commands output

tests/test-install.t

@@ -162,75 +162,6 b' Verify the json works too:'
     "fsmonitor-watchman": "false",
     "fsmonitor-watchman-error": "warning: Watchman unavailable: watchman exited with code 1",
 
-
-#if test-repo
-  $ . "$TESTDIR/helpers-testrepo.sh"
-
-  $ cat >> wixxml.py << EOF
-  > import os
-  > import subprocess
-  > import sys
-  > import xml.etree.ElementTree as ET
-  > from mercurial import pycompat
-  > 
-  > # MSYS mangles the path if it expands $TESTDIR
-  > testdir = os.environ['TESTDIR']
-  > ns = {'wix' : 'http://schemas.microsoft.com/wix/2006/wi'}
-  > 
-  > def directory(node, relpath):
-  >     '''generator of files in the xml node, rooted at relpath'''
-  >     dirs = node.findall('./{%(wix)s}Directory' % ns)
-  > 
-  >     for d in dirs:
-  >         for subfile in directory(d, relpath + d.attrib['Name'] + '/'):
-  >             yield subfile
-  > 
-  >     files = node.findall('./{%(wix)s}Component/{%(wix)s}File' % ns)
-  > 
-  >     for f in files:
-  >         yield pycompat.sysbytes(relpath + f.attrib['Name'])
-  > 
-  > def hgdirectory(relpath):
-  >     '''generator of tracked files, rooted at relpath'''
-  >     hgdir = "%s/../mercurial" % (testdir)
-  >     args = ['hg', '--cwd', hgdir, 'files', relpath]
-  >     proc = subprocess.Popen(args, stdout=subprocess.PIPE,
-  >                             stderr=subprocess.PIPE)
-  >     output = proc.communicate()[0]
-  > 
-  >     for line in output.splitlines():
-  >         if os.name == 'nt':
-  >             yield line.replace(pycompat.sysbytes(os.sep), b'/')
-  >         else:
-  >             yield line
-  > 
-  > tracked = [f for f in hgdirectory(sys.argv[1])]
-  > 
-  > xml = ET.parse("%s/../contrib/packaging/wix/%s.wxs" % (testdir, sys.argv[1]))
-  > root = xml.getroot()
-  > dir = root.find('.//{%(wix)s}DirectoryRef' % ns)
-  > 
-  > installed = [f for f in directory(dir, '')]
-  > 
-  > print('Not installed:')
-  > for f in sorted(set(tracked) - set(installed)):
-  >     print('  %s' % pycompat.sysstr(f))
-  > 
-  > print('Not tracked:')
-  > for f in sorted(set(installed) - set(tracked)):
-  >     print('  %s' % pycompat.sysstr(f))
-  > EOF
-
-  $ ( testrepohgenv; "$PYTHON" wixxml.py help )
-  Not installed:
-  Not tracked:
-
-  $ ( testrepohgenv; "$PYTHON" wixxml.py templates )
-  Not installed:
-  Not tracked:
-
-#endif
-
 Verify that Mercurial is installable with pip. Note that this MUST be
 the last test in this file, because we do some nasty things to the
 shell environment in order to make the virtualenv work reliably.