[green-dragon-migration] update the tasktool files to python3 (#147)

## In This PR

* Update tasktool files to python3 and allow task tool to be able to run
independently from source repo without having to rely on external
systems (CI) to set PYTHONPATH


This code has been tested on https://green.lab.llvm.org/

Author: justice-adams-apple

tasks/tasktool/bin/build

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import os.path
 sys.path = ['%s/..' % os.path.dirname(os.path.realpath(__file__))] + sys.path

tasks/tasktool/bin/task

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import os.path
 sys.path = ['%s/..' % os.path.dirname(os.path.realpath(__file__))] + sys.path

tasks/tasktool/tasktool/build.py

@@ -1,3 +1,8 @@
+import os
+import sys
+
+sys.path.append(os.path.dirname(__file__))
+
 from pipes import quote
 import json
 import os

tasks/tasktool/tasktool/task.py

@@ -1,6 +1,12 @@
 '''
 Task runner.
 '''
+
+import os
+import sys
+
+sys.path.append(os.path.dirname(__file__))
+
 import argparse
 import copy
 import json
@@ -150,8 +156,8 @@ def _rewrite_local_git_urls(buildconfig):
     Prefix all git repository urls in buildconfig that start with a slash
     (they reference local files) with a prefix of the local machine/user.
     '''
-    hostname = utils.check_output(['hostname', '-f']).strip()
-    user = utils.check_output(['whoami']).strip()
+    hostname = utils.check_output(['hostname', '-f'], encoding='utf8').strip()
+    user = utils.check_output(['whoami'], encoding='utf8').strip()
     for name, config in buildconfig.items():
         if not isinstance(config, dict):
             continue
@@ -294,7 +300,7 @@ def _make_buildscript(hook, buildconfig, keep_buildconfig=False):
         buildconfig_file.close()
         build = utils.check_output([hook, _userdir, buildconfig.taskfilename,
                                     buildconfig_filename,
-                                    buildconfig.taskname], cwd=_hooksdir)
+                                    buildconfig.taskname], cwd=_hooksdir, encoding='utf8')
         if not keep_buildconfig:
             os.unlink(buildconfig_filename)
 
@@ -307,7 +313,7 @@ def _make_buildscript(hook, buildconfig, keep_buildconfig=False):
 
 def _mk_submit_results(buildname):
     return utils.check_output(['./mk-submit-results', _userdir, buildname],
-                              cwd=_hooksdir)
+                              cwd=_hooksdir, encoding='utf8')
 
 
 def _command_try(args):
@@ -322,7 +328,7 @@ def _command_try(args):
         tempf.write(build)
         tempf.close()
         utils.check_call(['./exec-try-build', _userdir, tempf.name, buildname],
-                         cwd=_hooksdir)
+                         cwd=_hooksdir, encoding='utf8')
         os.unlink(tempf.name)
 
 
@@ -339,7 +345,7 @@ def _command_submit(args):
         tempf.write(build)
         tempf.close()
         utils.check_call(['./submit', _userdir, tempf.name, buildname],
-                         cwd=_hooksdir)
+                         cwd=_hooksdir, encoding='utf8')
         os.unlink(tempf.name)
 
 
@@ -368,7 +374,7 @@ def _command_jenkinsrun(args):
         repro_script = os.path.join(taskdir, 'repro_message.sh')
         if os.access(repro_script, os.X_OK):
             utils.check_call([repro_script, _userdir,
-                              buildconfig.taskfilename])
+                              buildconfig.taskfilename], encoding='utf8')
     sys.exit(retcode)
 
 
@@ -387,7 +393,7 @@ def _command_sshrun(args):
         run_file.close()
         try:
             utils.check_call(['./sshrun', argconfig.hostname, run_file.name],
-                             cwd=_hooksdir)
+                             cwd=_hooksdir, encoding='utf8')
         finally:
             os.unlink(run_file.name)