https://git.ruby-lang.org/ruby.git/commit/?id=cf904d9f9f

From cf904d9f9fb18fd2982651946125db62066c3ff5 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Tue, 28 May 2019 10:02:30 +0900
Subject: Avoid doubly building Travis and AppVeyor

but on "master" branch.

For Pull Request, I changed the approach from
d9b338a53f520b2dbb05555f18b8de8072300f40 and
277e68825a8e4d0e6503a32e41f8b1b6c078b567.

diff --git a/.travis.yml b/.travis.yml
index 2d6ea86..6e1d15e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -438,8 +438,9 @@ script: https://github.com/ruby/ruby/blob/trunk/.travis.yml#L438
 # Branch matrix.  Not all branches are Travis-ready so we limit branches here.
 branches:
   only:
-    - master
-    - trunk # for pull request. TODO: use `fork = true` or something.
+    # Because default branch is still "trunk", we build only "trunk" to avoid
+    # doubly building on master and trigger CI on Pull Request.
+    - trunk # TODO: s/master/trunk/ when the default branch is switched to master on 7/1.
     - ruby_2_4
     - ruby_2_5
     - ruby_2_6
diff --git a/appveyor.yml b/appveyor.yml
index 9ecb083..029a0b6 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,10 +3,11 @@ version: '{build}' https://github.com/ruby/ruby/blob/trunk/appveyor.yml#L3
 shallow_clone: true
 platform:
   - x64
-## Still allowing trunk branch for pull request. TODO: Skip non-pull-request trunk build.
-# branches:
-#   except:
-#     - trunk # mirrored master runs CI
+branches:
+  except:
+    # Because default branch is still "trunk", we build only "trunk" to avoid
+    # doubly building on master and trigger CI on Pull Request.
+    - master # mirrored from trunk
 environment:
   ruby_version: "24-%Platform%"
   zlib_version: "1.2.11"
-- 
cgit v0.10.2


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