Index: Jenkinsfile
===================================================================
--- Jenkinsfile	(revision c7449ce22883517f74841b78f74816bed5141196)
+++ Jenkinsfile	(revision de62f0f090d4a8952ddc0739fdbbc5a6f1fb4454)
@@ -87,5 +87,5 @@
 			sh "git reflog > ${out_dir}/GIT_COMMIT"
 		}
-		git_reflog = readFile('${out_dir}/GIT_COMMIT')
+		git_reflog = readFile("${out_dir}/GIT_COMMIT")
 		gitRefOldValue = (git_reflog =~ /moving from (.+) to (.+)/)[0][1]
 		gitRefNewValue = (git_reflog =~ /moving from (.+) to (.+)/)[0][2]