fastmanifest: fix test-check-code.t related errors

Summary:
D6685044 changed the location of fastmanifest which exposed it to the
additional test that failed. This commit fixes fastmanifest to address that
test.

Test Plan: Ran all the tests.

Reviewers: #mercurial, #sourcecontrol

Differential Revision: https://phabricator.intern.facebook.com/D6685170

hgext/fastmanifest/__init__.py

@@ -4,7 +4,7 @@
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
-"""
+'''
 This extension adds fastmanifest, a treemanifest disk cache for speeding up
 manifest comparison. It also contains utilities to investigate manifest access
 patterns.
@@ -92,7 +92,7 @@ is not normally accessible to manifests.
 `debugcachemanifest` is a command calling `_cachemanifest`, a function to add
 manifests to the cache and manipulate what is cached. It allows caching fast
 and flat manifest, asynchronously and synchronously.
-"""
+'''
 
 import sys
 

hgext/fastmanifest/cachemanager.py

@@ -8,7 +8,14 @@
 import os
 import errno
 
-from mercurial import extensions, revlog, scmutil, util, error
+from mercurial import (
+    encoding,
+    error,
+    extensions,
+    revlog,
+    scmutil,
+    util,
+)
 
 import cfastmanifest
 import concurrency
@@ -330,7 +337,7 @@ class triggers(object):
 
                 # see if the user wants us to invoke a specific instance of
                 # mercurial.
-                workerexe = os.environ.get("SCM_WORKER_EXE")
+                workerexe = encoding.environ.get("SCM_WORKER_EXE")
 
                 cmd = util.hgcmd()[:]
                 if workerexe is not None:

tests/test-check-code.t

@@ -84,12 +84,6 @@ New errors are not allowed. Warnings are strongly discouraged.
   hgext/fastannotate/commands.py:43:
    >         reldir = os.path.relpath(os.getcwd(), reporoot)
    use pycompat.getcwd instead (py3)
-  hgext/fastmanifest/__init__.py:7:
-   > """
-   don't capitalize docstring title
-  hgext/fastmanifest/cachemanager.py:333:
-   >                 workerexe = os.environ.get("SCM_WORKER_EXE")
-   use encoding.environ instead (py3)
   hgext/fbsparse.py:1177:
    >     cwd = util.normpath(os.getcwd())
    use pycompat.getcwd instead (py3)