Repository: spark
Updated Branches:
  refs/heads/master 729952a5e -> c42912606


[Build] Diff from branch point

Sometimes Jenkins posts [spurious reports of new classes being 
added](https://github.com/apache/spark/pull/2339#issuecomment-56570170). I 
believe this stems from diffing the patch against `master`, as opposed to 
against `master...`, which starts from the commit the PR was branched from.

This patch fixes that behavior.

Author: Nicholas Chammas <nicholas.cham...@gmail.com>

Closes #2512 from nchammas/diff-only-commits-ahead and squashes the following 
commits:

c065599 [Nicholas Chammas] comment typo fix
a453c67 [Nicholas Chammas] diff from branch point


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/c4291260
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/c4291260
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/c4291260

Branch: refs/heads/master
Commit: c429126066f766396b706894b6942f1ca7fcb528
Parents: 729952a
Author: Nicholas Chammas <nicholas.cham...@gmail.com>
Authored: Wed Sep 24 11:33:58 2014 -0700
Committer: Patrick Wendell <pwend...@gmail.com>
Committed: Wed Sep 24 11:33:58 2014 -0700

----------------------------------------------------------------------
 dev/run-tests-jenkins | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/spark/blob/c4291260/dev/run-tests-jenkins
----------------------------------------------------------------------
diff --git a/dev/run-tests-jenkins b/dev/run-tests-jenkins
index 06c3781..a6ecf31 100755
--- a/dev/run-tests-jenkins
+++ b/dev/run-tests-jenkins
@@ -92,13 +92,13 @@ function post_message () {
     merge_note=" * This patch merges cleanly."
 
     source_files=$(
-        git diff master --name-only \
+        git diff master... --name-only              `# diff patch against 
master from branch point` \
       | grep -v -e "\/test"                         `# ignore files in test 
directories` \
       | grep -e "\.py$" -e "\.java$" -e "\.scala$"  `# include only code 
files` \
       | tr "\n" " "
     )
     new_public_classes=$(
-        git diff master ${source_files}         `# diff this patch against 
master and...` \
+        git diff master... ${source_files}      `# diff patch against master 
from branch point` \
       | grep "^\+"                              `# filter in only added lines` 
\
       | sed -r -e "s/^\+//g"                    `# remove the leading +` \
       | grep -e "trait " -e "class "            `# filter in lines with these 
key words` \


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