Remove some luigi config if using newer package

apparently some of these settings are no longer used by latest luigi,
and it complains when they're present

rattail_fabric2/deploy/luigi/luigi.cfg.mako

@@ -12,6 +12,8 @@
 [core]
 logging_conf_file = ${appdir}/luigi/logging.conf
 
+% if LUIGI2:
+
 # Number of seconds to wait before timing out when making an API call. Defaults
 # to 10.0
 # (sometimes things can lag for us and we simply need to give it more time)
@@ -27,6 +29,8 @@ rpc_retry_attempts = 10
 # (occasional network issues seem to cause us to need more/longer retries)
 rpc_retry_wait = 60
 
+% endif
+
 [retcode]
 # cf. https://luigi.readthedocs.io/en/stable/configuration.html#retcode-config
 # The following return codes are the recommended exit codes for Luigi

rattail_fabric2/luigi.py

@@ -25,6 +25,8 @@ Fabric library for Luigi apps
 """
 
 import os
+import re
+from pkg_resources import parse_version
 
 from rattail_fabric2 import postgresql, make_deploy, mkdir
 
@@ -48,6 +50,14 @@ def install_luigi(c, envroot, luigi='luigi', user='rattail',
     c.sudo("""bash -lc "workon {} && pip install '{}'" """.format(envname, luigi),
            user=user)
 
+    # detect luigi version
+    LUIGI2 = False
+    output = c.sudo("bash -lc 'workon {} && pip show luigi | grep Version'".format(envname), user=user).stdout.strip()
+    match = re.match(r'^Version: (\d+\S+)$', output)
+    if match:
+        if parse_version(match.group(1)) < parse_version('3'):
+            LUIGI2 = True
+
     # dirs
     mkdir(c, ['{}/luigi'.format(appdir),
               '{}/luigi/log'.format(appdir),