Make CLI throw an error if it cannot find tor binary

cli/onionshare_cli/__init__.py

@@ -22,7 +22,7 @@ import os, sys, time, argparse, threading
 from datetime import datetime
 from datetime import timedelta
 
-from .common import Common
+from .common import Common, CannotFindTor
 from .web import Web
 from .onion import *
 from .onionshare import OnionShare
@@ -320,7 +320,15 @@ def main(cwd=None):
     web = Web(common, False, mode_settings, mode)
 
     # Start the Onion object
-    onion = Onion(common, use_tmp_dir=True)
+    try:
+        onion = Onion(common, use_tmp_dir=True)
+    except CannotFindTor:
+        print("You must install tor to use OnionShare from the command line")
+        if common.platform == "Darwin":
+            print("In macOS, you can do this with Homebrew (https://brew.sh):")
+            print("  brew install tor")
+        sys.exit()
+
     try:
         onion.connect(
             custom_settings=False,

cli/onionshare_cli/common.py

@@ -34,6 +34,12 @@ from pkg_resources import resource_filename
 from .settings import Settings
 
 
+class CannotFindTor(Exception):
+    """
+    OnionShare can't find a tor binary
+    """
+
+
 class Common:
     """
     The Common object is shared amongst all parts of OnionShare.
@@ -82,6 +88,8 @@ class Common:
     def get_tor_paths(self):
         if self.platform == "Linux":
             tor_path = shutil.which("tor")
+            if not tor_path:
+                raise CannotFindTor()
             obfs4proxy_file_path = shutil.which("obfs4proxy")
             prefix = os.path.dirname(os.path.dirname(tor_path))
             tor_geo_ip_file_path = os.path.join(prefix, "share/tor/geoip")
@@ -94,6 +102,8 @@ class Common:
             tor_geo_ipv6_file_path = os.path.join(base_path, "Data", "Tor", "geoip6")
         elif self.platform == "Darwin":
             tor_path = shutil.which("tor")
+            if not tor_path:
+                raise CannotFindTor()
             obfs4proxy_file_path = shutil.which("obfs4proxy")
             prefix = os.path.dirname(os.path.dirname(tor_path))
             tor_geo_ip_file_path = os.path.join(prefix, "share/tor/geoip")

cli/onionshare_cli/onion.py

@@ -32,7 +32,6 @@ import getpass
 import psutil
 
 from distutils.version import LooseVersion as Version
-from . import common
 from .settings import Settings
 
 # TODO: Figure out how to localize this for the GUI
@@ -44,40 +43,30 @@ class TorErrorAutomatic(Exception):
     using automatic settings that should work with Tor Browser.
     """
 
-    pass
-
 
 class TorErrorInvalidSetting(Exception):
     """
     This exception is raised if the settings just don't make sense.
     """
 
-    pass
-
 
 class TorErrorSocketPort(Exception):
     """
     OnionShare can't connect to the Tor controller using the supplied address and port.
     """
 
-    pass
-
 
 class TorErrorSocketFile(Exception):
     """
     OnionShare can't connect to the Tor controller using the supplied socket file.
     """
 
-    pass
-
 
 class TorErrorMissingPassword(Exception):
     """
     OnionShare connected to the Tor controller, but it requires a password.
     """
 
-    pass
-
 
 class TorErrorUnreadableCookieFile(Exception):
     """
@@ -85,8 +74,6 @@ class TorErrorUnreadableCookieFile(Exception):
     to access the cookie file.
     """
 
-    pass
-
 
 class TorErrorAuthError(Exception):
     """
@@ -94,8 +81,6 @@ class TorErrorAuthError(Exception):
     that a Tor controller isn't listening on this port.
     """
 
-    pass
-
 
 class TorErrorProtocolError(Exception):
     """
@@ -103,8 +88,6 @@ class TorErrorProtocolError(Exception):
     isn't acting like a Tor controller (such as in Whonix).
     """
 
-    pass
-
 
 class TorTooOld(Exception):
     """
@@ -113,8 +96,6 @@ class TorTooOld(Exception):
     is too old.
     """
 
-    pass
-
 
 class BundledTorTimeout(Exception):
     """