Bug 1637381: Use python3 for repack_rust.py r=glandium

repack_rust.py was the only toolchain build using a python script directly. we
don't need it to use the `mach python` wrapper, so remove that special casing
from the transform.

Differential Revision: https://phabricator.services.mozilla.com/D75702

taskcluster/docker/toolchain-build/Dockerfile

@@ -39,6 +39,8 @@ RUN apt-get update && \
       python-setuptools \
       python-virtualenv \
       python3-distutils-extra \
+      python3-requests \
+      python3-pytoml \
       subversion \
       tar \
       unzip \

taskcluster/scripts/misc/repack_rust.py

@@ -1,4 +1,4 @@
-#!/bin/env python
+#!/usr/bin/env python3
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
@@ -70,7 +70,7 @@ def setup_gpg():
     signature checks can succeed or fail cleanly.'''
     keyid = '0x85AB96E6FA1BE5FE'
     log('Importing signing key %s...' % keyid)
-    key = '''
+    key = b'''
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 
 mQINBFJEwMkBEADlPACa2K7reD4x5zd8afKx75QYKmxqZwywRbgeICeD4bKiQoJZ
@@ -159,7 +159,7 @@ Mve696B5tlHyc1KxjHR6w9GRsh4=
 '''
     check_call_with_input(['gpg', '--import'], key)
     check_call_with_input(['gpg', '--command-fd', '0', '--edit-key', keyid],
-                          'trust\n5\ny\n')
+                          b'trust\n5\ny\n')
 
 
 def verify_sha(filename, sha):
@@ -432,7 +432,7 @@ def args():
     if not args.host:
         args.host = 'linux64'
     args.host = expand_platform(args.host)
-    args.targets = map(expand_platform, args.targets)
+    args.targets = [expand_platform(t) for t in args.targets]
 
     return args
 

taskcluster/taskgraph/transforms/job/toolchain.py

@@ -8,7 +8,6 @@ Support for running toolchain-building jobs via dedicated scripts
 from __future__ import absolute_import, print_function, unicode_literals
 
 from mozbuild.shellutil import quote as shell_quote
-from mozpack import path
 
 from six import text_type
 from taskgraph.util.schema import Schema
@@ -149,17 +148,10 @@ def docker_worker_toolchain(config, job, taskdesc):
             'digest-data': get_digest_data(config, run, taskdesc),
         }
 
-    # Use `mach` to invoke python scripts so in-tree libraries are available.
-    if run['script'].endswith('.py'):
-        wrapper = [path.join(gecko_path, 'mach'), 'python']
-    else:
-        wrapper = []
-
     run['using'] = 'run-task'
     run['cwd'] = run['workdir']
     run["command"] = (
-        wrapper
-        + ["workspace/build/src/taskcluster/scripts/misc/{}".format(run.pop("script"))]
+        ["workspace/build/src/taskcluster/scripts/misc/{}".format(run.pop("script"))]
         + run.pop("arguments", [])
     )