tools: Create more consistent checks for venv.

This helps make the Zulip development environment somewhat more robust
to new contributors, since it will give them a nice warning if they
try running any of our development tools outside the Zulip virtualenv.

Fixes #3468.

frontend_tests/run-casper

@@ -5,15 +5,6 @@ import subprocess
 import sys
 import os
 import glob
-try:
-    # We don't actually need typing, but it's a good guard for being
-    # outside a Zulip virtualenv.
-    from typing import Iterable
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip tests inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 #
 # In order to use remote casperjs debugging, pass the --remote-debug flag
@@ -49,9 +40,15 @@ parser.add_option('--remote-debug',
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.dirname(TOOLS_DIR))
 
+# check for the venv
+from tools.lib import sanity_check
+sanity_check.check_venv(__file__)
+
 from tools.lib.test_script import get_provisioning_status
 from tools.lib.test_server import test_server_running
 
+from typing import Iterable
+
 if not options.force:
     ok, msg = get_provisioning_status()
     if not ok:

tools/check-css

@@ -6,14 +6,9 @@ import os
 import sys
 import glob
 
-try:
-    import lister
-    from typing import cast, Callable, Dict, Iterable, List
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip linters inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
 
 def validate(fn):
     # type: (str) -> None

tools/check-templates

@@ -8,14 +8,13 @@ import sys
 import logging
 
 from six.moves import filter
-try:
+
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 import lister
 from typing import cast, Callable, Dict, Iterable, List
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip linters inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 EXCLUDED_FILES = [
     ## Test data Files for testing modules in tests

tools/compile-handlebars-templates

@@ -8,6 +8,10 @@ import subprocess
 import sys
 import time
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
 from django.conf import settings

tools/create-test-api-docs

@@ -1,5 +1,10 @@
 #!/usr/bin/env python
 from __future__ import print_function
+from __future__ import absolute_import
+
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
 
 from collections import defaultdict
 from typing import Any, Dict, Iterable, Set

tools/diagnose

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 from __future__ import print_function
+from __future__ import absolute_import
 import os
 import platform
 import sys

tools/find-add-class

@@ -7,15 +7,9 @@ import glob
 import argparse
 import sys
 
-from six.moves import filter
-try:
-    import lister
-    from typing import cast, Callable, Dict, Iterable, List
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip linters inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
 
 def process_files():
     # type: () -> None

tools/get-handlebar-vars

@@ -1,9 +1,14 @@
 #!/usr/bin/env python
 from __future__ import print_function
+from __future__ import absolute_import
 import sys
 import re
 import json
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 from typing import Any, Dict, List
 
 def debug(obj):

tools/html-grep

@@ -6,13 +6,12 @@ import optparse
 import sys
 
 from six.moves import filter
-try:
+
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 import lister
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip linters inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 USAGE = '''
     This file greps HTML files for keywords in a context-sensitive manner.

tools/lib/sanity_check.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+from __future__ import print_function
+
+import sys
+
+def check_venv(filename):
+    # type: (str) -> None
+    try:
+        import ujson
+    except ImportError:
+        print("You need to run %s inside a Zulip dev environment." % (filename,))
+        print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
+        sys.exit(1)

tools/lint-all

@@ -10,14 +10,12 @@ import optparse
 import subprocess
 import traceback
 
-try:
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 import lister
 from typing import cast, Any, Callable, Dict, Iterator, List, Optional, Tuple
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip linters inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 # Exclude some directories and files from lint checking
 EXCLUDED_FILES = [

tools/lister.py

@@ -10,6 +10,7 @@ import re
 from collections import defaultdict
 import argparse
 from six.moves import filter
+
 from typing import Union, List, Dict
 
 def get_ftype(fpath, use_shebang):

tools/run-dev-queue-processors

@@ -5,12 +5,16 @@
 # separate script so that the import from zerver.worker.queue_processors (which
 # is slow) can be done in parallel with the rest of the work in bringing up the
 # dev server.
-
+from __future__ import absolute_import
 import sys
 import os
-import django
 import subprocess
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
+import django
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 django.setup()
 

tools/run-dev.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 from __future__ import print_function
+from __future__ import absolute_import
 
 import optparse
 import os
@@ -12,6 +13,10 @@ import traceback
 
 from six.moves.urllib.parse import urlunparse
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 from tornado import httpclient
 from tornado import httputil
 from tornado import gen

tools/run-mypy

@@ -5,11 +5,11 @@ from __future__ import print_function
 
 import os
 import sys
-import lister
 import argparse
 import subprocess
 import six
 
+import lister
 from typing import cast, Dict, List
 
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))

tools/test-api

@@ -1,17 +1,14 @@
 #!/usr/bin/env python
 from __future__ import print_function
-
+from __future__ import absolute_import
 import os
 import sys
 
-try:
-    import django
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip tests inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
 
+import django
 TOOLS_DIR = os.path.dirname(__file__)
 ROOT_DIR = os.path.dirname(TOOLS_DIR)
 sys.path.insert(0, ROOT_DIR)

tools/test-backend

@@ -1,23 +1,19 @@
 #!/usr/bin/env python
 
 from __future__ import print_function
+from __future__ import absolute_import
 import optparse
 import os
 import sys
 import subprocess
 
-try:
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 import django
 from django.conf import settings
 from django.test.utils import get_runner
-    # We don't actually need typing, but it's a good guard for being
-    # outside a Zulip virtualenv.
-    import typing
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip tests inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 if __name__ == "__main__":
     TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))

tools/test-help-documentation.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 from __future__ import print_function
+from __future__ import absolute_import
 import optparse
 import os
 import sys
@@ -7,16 +8,12 @@ import subprocess
 
 import time
 
-try:
-    # We don't actually need typing, but it's a good guard for being
-    # outside a Zulip virtualenv.
-    from typing import Iterable
+
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 import requests
-except ImportError as e:
-    print("ImportError: {}".format(e))
-    print("You need to run the Zulip tests inside a Zulip dev environment.")
-    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
-    sys.exit(1)
 
 parser = optparse.OptionParser()
 parser.add_option('--force', default=False,

tools/test-queue-worker-reload

@@ -11,6 +11,10 @@ import subprocess
 import re
 
 from six.moves import range
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 from typing import IO, Text
 
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))

tools/test-run-dev

@@ -10,6 +10,9 @@ import signal
 import subprocess
 
 from six.moves import range
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
 from typing import IO
 
 

tools/test-tools

@@ -8,6 +8,10 @@ import os
 import sys
 import unittest
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('--coverage', dest='coverage',

tools/update-authors-json

@@ -5,6 +5,11 @@ JSON data for the /authors page.
 """
 
 from __future__ import absolute_import, print_function
+
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 from typing import Any, Dict, List, Optional, Union, Text
 
 import os

tools/update-prod-static

@@ -9,6 +9,10 @@ import subprocess
 import argparse
 import sys
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 # We need settings so we can figure out where the prod-static directory is.
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 import scripts.lib.setup_path_on_import

tools/webpack

@@ -6,6 +6,10 @@ import os
 import subprocess
 import sys
 
+# check for the venv
+from lib import sanity_check
+sanity_check.check_venv(__file__)
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
 os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
 from django.conf import settings