Add Jenkins pipeline linter

Change-Id: I3ea496933837fd03423286a3c7c27ebd8672ae44

Author: ssbarnea

.gitignore

@@ -13,7 +13,6 @@ jenkins.war
 nosetests.xml
 coverage*/
 .idea/
-bin/
 include/
 lib/
 *.egg

bin/pipelint

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -eo pipefail
+
+INPUT=/dev/stdin
+if [ -t 0 ]; then
+    if [ "$#" -ne 1 ]; then
+        echo "ERROR: Illegal number of parameters."
+        echo "INFO:  Use 'pipefail Jenkinsfile' or 'cat Jenkinsfile | pipefail'"
+        exit 1
+    fi
+    INPUT=$1
+fi
+# put credentials inside ~/.netrc
+# define JENKINS_URL in your user profile
+JENKINS_URL=${JENKINS_URL:-http://localhost:8080}
+
+# failure to get crumb is ignored as this may be diabled on the server side
+CRUMB="-H `curl -nfs "$JENKINS_URL/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,%22:%22,//crumb)"`" || CRUMB=''
+
+# The tee+grep trick assures that the exit code is 0 only if the server replied with "successfully validated"
+curl -nfs -X POST $CRUMB -F "jenkinsfile=<-" $JENKINS_URL/pipeline-model-converter/validate <$INPUT \
+  | tee >(cat 1>&2) | grep 'successfully validated' >/dev/null