Better error message running with -c and pywin32 is not importable.

Atempting to do this. It should work on windows, but I can't test.

Author: rouilj

CHANGES.txt

@@ -12,6 +12,16 @@ v2.7.2 or later are required to run newer releases of Roundup.  From v2.0
 onwards Python 3.4 and later are also supported.
 
 
+2019-xx-xx 2.0.0...
+
+Features:
+
+Fixed:
+
+- issue2550996 - Give better error message when running with -c
+ (install as windows service) and pywin32 is not importable. Could use
+ better testing on a windows box. (John Rouillard)
+
 2019-10-23 2.0.0 alpha 0
 
 Features:

roundup/scripts/roundup_server.py

@@ -951,9 +951,7 @@ def run(port=undefined, success_message=None):
     '''
     config = ServerConfig()
     # additional options
-    short_options = "hvS"
-    if RoundupService:
-        short_options += 'c'
+    short_options = "hvSc"
     try:
         (optlist, args) = config.getopt(sys.argv[1:],
             short_options, ("help", "version", "save-config",))
@@ -963,6 +961,17 @@ def run(port=undefined, success_message=None):
 
     # if running in windows service mode, don't do any other stuff
     if ("-c", "") in optlist:
+        global RoundupService
+        if not RoundupService:
+            RoundupService = True  # make sure usage displays -c help text
+            error_m = """
+ERROR: -c is not available because roundup couldn't import
+   win32serviceutil from pywin32. See Installation docs
+   for pywin32 details.
+            """
+            usage(error_m)
+            return
+
         # acquire command line options recognized by service
         short_options = "cC:"
         long_options = ["config"]