[PATCH] build-many-glibcs: don't crash if email is not configured

[Zack Weinberg]

The 'bot-cycle' action for build-many-glibcs is a convenient way to
not have to remember all the steps in keeping a many-glibcs tree up
to date ... or it would be, if the script could send mail _optionally_.
Make it so by skipping the mail step if mail isn't configured.

OK?

	* scripts/build-many-glibcs.py (bot_build_mail):  If the
	bot_config does not contain all of the necessary email-
	related settings, just print a warning and continue.
---
 scripts/build-many-glibcs.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index d2947e676b..4f724ced6f 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -122,6 +122,7 @@ class Context(object):
         self.load_versions_json()
         self.load_build_state_json()
         self.status_log_list = []
+        self.email_warning = False
 
     def get_script_text(self):
         """Return the text of this script."""
@@ -1003,6 +1004,15 @@ class Context(object):
 
     def bot_build_mail(self, action, build_time):
         """Send email with the results of a build."""
+        if not ('email-from' in self.bot_config and
+                'email-server' in self.bot_config and
+                'email-subject' in self.bot_config and
+                'email-to' in self.bot_config):
+            if not self.email_warning:
+                print("Email not configured, not sending.")
+                self.email_warning = True
+            return
+
         build_time = build_time.replace(microsecond=0)
         subject = (self.bot_config['email-subject'] %
                    {'action': action,
-- 
2.11.0