From d7b5f102319bb0389c5248e9ecf533eae4163424 Mon Sep 17 00:00:00 2001
From: James Morris <6653392+J-M0@users.noreply.github.com>
Date: Mon, 11 Dec 2023 12:27:15 -0500
Subject: [PATCH] gh-112507: Detect Cygwin and MSYS with `uname` instead of
 `$OSTYPE` (GH-112508)

Detect Cygwin and MSYS with `uname` instead of `$OSTYPE`

`$OSTYPE` is not defined by POSIX and may not be present in other shells.
`uname` is always available in any shell.
---
 Lib/venv/scripts/common/activate | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/Lib/venv/scripts/common/activate b/Lib/venv/scripts/common/activate
index 6fdf423a1c5..a4e0609045a 100644
--- a/Lib/venv/scripts/common/activate
+++ b/Lib/venv/scripts/common/activate
@@ -36,14 +36,18 @@ deactivate () {
 deactivate nondestructive
 
 # on Windows, a path can contain colons and backslashes and has to be converted:
-if [ "${OSTYPE:-}" = "cygwin" ] || [ "${OSTYPE:-}" = "msys" ] ; then
-    # transform D:\path\to\venv to /d/path/to/venv on MSYS
-    # and to /cygdrive/d/path/to/venv on Cygwin
-    export VIRTUAL_ENV=$(cygpath "__VENV_DIR__")
-else
-    # use the path as-is
-    export VIRTUAL_ENV="__VENV_DIR__"
-fi
+case "$(uname)" in
+    CYGWIN*|MSYS*)
+        # transform D:\path\to\venv to /d/path/to/venv on MSYS
+        # and to /cygdrive/d/path/to/venv on Cygwin
+        VIRTUAL_ENV=$(cygpath "__VENV_DIR__")
+        export VIRTUAL_ENV
+        ;;
+    *)
+        # use the path as-is
+        export VIRTUAL_ENV="__VENV_DIR__"
+        ;;
+esac
 
 _OLD_VIRTUAL_PATH="$PATH"
 PATH="$VIRTUAL_ENV/__VENV_BIN_NAME__:$PATH"