From 672050727f836374f05f6fa3aa12f0150407ad8d Mon Sep 17 00:00:00 2001
From: jack1142 <6032823+jack1142@users.noreply.github.com>
Date: Sun, 8 Dec 2019 01:31:43 +0100
Subject: [PATCH] [Downloader] Ensure consistent output from git commands
 (#3160)

* fix(downloader): ensure consistent output from git commands

* chore(changelog): add towncrier entry
---
 changelog.d/downloader/3160.misc.rst   | 1 +
 redbot/cogs/downloader/repo_manager.py | 6 ++++++
 2 files changed, 7 insertions(+)
 create mode 100644 changelog.d/downloader/3160.misc.rst

diff --git a/changelog.d/downloader/3160.misc.rst b/changelog.d/downloader/3160.misc.rst
new file mode 100644
index 000000000..1093dc0ee
--- /dev/null
+++ b/changelog.d/downloader/3160.misc.rst
@@ -0,0 +1 @@
+Ensure consistent output from git commands for purpose of parsing.
\ No newline at end of file
diff --git a/redbot/cogs/downloader/repo_manager.py b/redbot/cogs/downloader/repo_manager.py
index 255ca8d67..51a01ae37 100644
--- a/redbot/cogs/downloader/repo_manager.py
+++ b/redbot/cogs/downloader/repo_manager.py
@@ -513,6 +513,12 @@ class Repo(RepoJSONMixin):
         """
         env = os.environ.copy()
         env["GIT_TERMINAL_PROMPT"] = "0"
+        # attempt to force all output to plain ascii english
+        # some methods that parse output may expect it
+        # according to gettext manual both variables have to be set:
+        # https://www.gnu.org/software/gettext/manual/gettext.html#Locale-Environment-Variables
+        env["LC_ALL"] = "C"
+        env["LANGUAGE"] = "C"
         kwargs["env"] = env
         async with self._repo_lock:
             p: CompletedProcess = await self._loop.run_in_executor(