Bug 1123821 - Use the build virtualenv for private local toolchain commands. r=firefox-build-system-reviewers,andi

Differential Revision: https://phabricator.services.mozilla.com/D175443

build/moz.configure/bootstrap.configure

@@ -237,6 +237,8 @@ def bootstrap_path(path, **kwargs):
                 command = (
                     [
                         "python",
+                        "--virtualenv",
+                        "build",
                         os.path.join(
                             build_env.topsrcdir,
                             "taskcluster/scripts/misc",

taskcluster/scripts/misc/private_local_toolchain.sh

@@ -9,6 +9,6 @@ shift
 artifact=$(basename $TOOLCHAIN_ARTIFACT)
 dir=${artifact%.tar.*}
 
-$GECKO_PATH/mach python $(dirname $0)/$script "$@" $dir
+$GECKO_PATH/mach python --virtualenv build $(dirname $0)/$script "$@" $dir
 
 $(dirname $0)/pack.sh $dir