pythonPackages.magic-wormhole: patch the call to 'locale'

pkgs/development/python-modules/magic-wormhole/default.nix

@@ -17,6 +17,7 @@
 , ipaddress
 , txtorcon
 , nettools
+, glibc
 , glibcLocales
 , mock
 , magic-wormhole-transit-relay
@@ -38,6 +39,12 @@ buildPythonPackage rec {
   postPatch = ''
     sed -i -e "s|'ifconfig'|'${nettools}/bin/ifconfig'|" src/wormhole/ipaddrs.py
     sed -i -e "s|if (os.path.dirname(os.path.abspath(wormhole))|if not os.path.abspath(wormhole).startswith('/nix/store') and (os.path.dirname(os.path.abspath(wormhole))|" src/wormhole/test/test_cli.py
+
+    # magic-wormhole will attempt to find all available locales by running
+    # 'locale -a'.  If we're building on Linux, then this may result in us
+    # running the system's locale binary instead of the one from Nix, so let's
+    # ensure we patch this.
+    sed -i -e 's|getProcessOutputAndValue("locale"|getProcessOutputAndValue("${glibc}/bin/locale"|' src/wormhole/test/test_cli.py
   '' + lib.optionalString (pythonAtLeast "3.3") ''
     sed -i -e 's|"ipaddress",||' setup.py
   '';