bpo-32409: Fix regression in activate.bat on international Windows (GH-10295) (GH-10377)

miss-islington · samstagern · vsajip · commit 881e273c795f · 2018-11-07T19:26:15.000Z
Handle Unicode contents on localised Windows systems when activating a venv. activate.bat currently breaks on German Windows systems, as chcp.com does not return a plain number as on English systems, but (arbitrarily) appends a dot at the end (for example "Aktive Codepage: 850." instead of "Active Codepage: 850"). The dependency to chcp.com is removed and ctypes is used to get, set and restore the console output code page. The code page for console input is not changed. We can't use __VENV_PYTHON__ to find python.exe, since it's UTF-8. cmd.exe decodes the script using the console output code page. (cherry picked from commit c64583b) Co-authored-by: samstagern <30337691+samstagern@users.noreply.github.com>
diff --git a/Lib/venv/scripts/nt/activate.bat b/Lib/venv/scripts/nt/activate.bat
@@ -1,11 +1,10 @@
 @echo off
 
-rem This file is UTF-8 encoded, so we need to update the current code page while executing it
-for /f "tokens=2 delims=:" %%a in ('"%SystemRoot%\System32\chcp.com"') do (
-    set "_OLD_CODEPAGE=%%a"
-)
+rem This file is UTF-8 encoded, so we need to update the current code page while executing it.
+for /f %%a in ('%~dp0python.exe -Ic "import ctypes; print(ctypes.windll.kernel32.GetConsoleOutputCP())"') do (set "_OLD_CODEPAGE=%%a")
+
 if defined _OLD_CODEPAGE (
-    "%SystemRoot%\System32\chcp.com" 65001 > nul
+    %~dp0python.exe -Ic "import ctypes; ctypes.windll.kernel32.SetConsoleOutputCP(65001)"
 )
 
 set "VIRTUAL_ENV=__VENV_DIR__"
@@ -40,6 +39,6 @@ set "PATH=%VIRTUAL_ENV%\__VENV_BIN_NAME__;%PATH%"
 
 :END
 if defined _OLD_CODEPAGE (
-    "%SystemRoot%\System32\chcp.com" %_OLD_CODEPAGE% > nul
+    %~dp0python.exe -Ic "import ctypes; ctypes.windll.kernel32.SetConsoleOutputCP(%_OLD_CODEPAGE%)"
     set "_OLD_CODEPAGE="
 )
diff --git a/Misc/NEWS.d/next/Library/2018-11-02-12-01-00.bpo-32409.MFRX2Q.rst b/Misc/NEWS.d/next/Library/2018-11-02-12-01-00.bpo-32409.MFRX2Q.rst
@@ -0,0 +1,2 @@
+Fixed implementation of :file:`activate.bat` to handle Unicode contents on
+localized Windows systems (eg. German). Patch by Martin Bijl.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fixed implementation of :file:`activate.bat` to handle Unicode contents on
	`2`	`+localized Windows systems (eg. German). Patch by Martin Bijl.`