--- a/checker.py	Mon Jul 25 14:03:08 2016 +0800
+++ b/checker.py	Mon Jul 25 15:28:27 2016 +0800
@@ -48,6 +48,18 @@
         return False
 
 
+def run_git(args, **kwargs):
+    env = kwargs.pop('env', {})
+    env.update({'LC_ALL': 'en_US.UTF-8'})
+    return run(['git'] + args, env=env, **kwargs)
+
+
+def run_hg(args, **kwargs):
+    env = kwargs.pop('env', {})
+    env.update({'HGPLAIN': '1'})
+    return run(['hg'] + args, env=env, **kwargs)
+
+
 def read_linter_config(name, path=rel('linters')):
     try:
         fd = open(os.path.join(path, '{}.yml'.format(name)))
@@ -89,27 +101,27 @@
 
 
 def git_clone(url, dest):
-    return run(['git', 'clone', url, dest])
+    return run_git(['clone', url, dest])
 
 
 def hg_clone(url, dest):
-    return run(['hg', 'clone', url, dest])
+    return run_hg(['clone', url, dest])
 
 
 def git_checkout(commit):
-    return run(['git', 'checkout', commit])
+    return run_git(['checkout', commit])
 
 
 def hg_update(commit):
-    return run(['hg', 'update', commit])
+    return run_hg(['update', commit])
 
 
 def git_status():
-    return run(['git', 'status'])
+    return run_git(['status'])
 
 
 def hg_summary():
-    return run(['hg', 'sum'])
+    return run_hg(['summary'])
 
 
 def git_show():
@@ -118,7 +130,7 @@
                 r'# C&O commit date: %ai%n'
                 r'# C&O commit author: %aN%n'
                 r'# C&O commit message: %s%n')
-    return run(['git', 'show', '-q', '--format=format:' + template], silent=True)
+    return run_git(['show', '-q', '--format=format:' + template], silent=True)
 
 
 def hg_log():
@@ -127,13 +139,13 @@
                 r'# C&O commit date: {date|isodatesec}\n'
                 r'# C&O commit author: {author|person}\n'
                 r'# C&O commit message: {desc|firstline}\n')
-    return run(['hg', 'log', '-r', '.', '-T', template], silent=True)
+    return run_hg(['log', '-r', '.', '-T', template], silent=True)
 
 
 def git_files(include, exclude):
-    cmd = ['git', 'ls-files']
+    cmd = ['ls-files']
     cmd.extend(include)
-    files = run(cmd, silent=True, get_output=True)
+    files = run_git(cmd, silent=True, get_output=True)
     if files is not False:
         files = files.splitlines()
         for e in exclude:
@@ -142,12 +154,12 @@
 
 
 def hg_files(include, exclude):
-    cmd = ['hg', 'files']
+    cmd = ['files']
     for pat in include:
         cmd.extend(('-I', pat))
     for pat in exclude:
         cmd.extend(('-X', pat))
-    files = run(cmd, silent=True, get_output=True, ignore_codes=(1,))
+    files = run_hg(cmd, silent=True, get_output=True, ignore_codes=(1,))
     if files is not False:
         files = files.splitlines()
     return files
@@ -162,8 +174,6 @@
 
     print('# C&O task: clone')
     print('# C&O project URL: {}'.format(config['url']))
-    if config['scm'] == 'hg':
-        os.environ['HGPLAIN'] = '1'
 
     if config['scm'] == 'git':
         if not git_clone(config['url'], source):
@@ -263,7 +273,6 @@
 
 def wrapper(config, args):
     print('# C&O job started: {}'.format(timestamp()))
-    os.environ.update({'LC_ALL': 'en_US.UTF-8'})
     tmp = mkdtemp(prefix='candolint.')
 
     if not execute(tmp, config, args):