Added warning about user existence.

fix #74

modoboa_installer/scripts/__init__.py

@@ -11,7 +11,7 @@ def install(appname, config):
     if (config.has_option(appname, "enabled") and
             not config.getboolean(appname, "enabled")):
         return
-    utils.printcolor("Installing {}".format(appname), utils.YELLOW)
+    utils.printcolor("Installing {}".format(appname), utils.MAGENTA)
     try:
         script = importlib.import_module(
             "modoboa_installer.scripts.{}".format(appname))

modoboa_installer/system.py

@@ -14,6 +14,14 @@ def create_user(name, home=None):
     except KeyError:
         pass
     else:
+        extra_message = "."
+        if home:
+            extra_message = (
+                " but please make sure the {} directory exists.".format(
+                    home))
+        utils.printcolor(
+            "User {} already exists, skipping creation{}".format(
+                name, extra_message), utils.YELLOW)
         return
     cmd = "useradd -m "
     if home: