Description of problem:
No warning appears if create with local file as source secret for option --build-secret; Only the build stays in New state and below warning appears when describe build:
Build has error: failed to create build pod: Pod "build-secret-1-build" is invalid: [spec.volumes[2].name: invalid value '/root/test-build', Details: must be a DNS label (at most 63 characters, matching regex [a-z0-9]([-a-z0-9]*[a-z0-9])?): e.g. "my-name", spec.containers[0].volumeMounts[2].name: not found '/root/test-build']

Version-Release number of selected component (if applicable):
openshift v1.1.1-287-g313292a
kubernetes v1.2.0-alpha.4-851-g4a65fa1
etcd 2.2.2

How reproducible:
always

Steps to Reproduce:
1.Create a project
2.Create resources with a file as secret
$oc new-build --image=ruby:22 https://github.com/wzheng1/build-secret.git --build-secret /local/src/file:/destination/dir

Actual results:
No warning appears during creating resources, only build stays New. When try to describe the build, below error appears:
[root@ip-172-18-8-18 ~]# oc describe builds build-secret-1
Name:		build-secret-1
Created:	15 seconds ago
Labels:		build=build-secret,buildconfig=build-secret,openshift.io/build-config.name=build-secret
Annotations:	openshift.io/build.number=1
Build Config:	build-secret
Duration:	waiting for 15s
Build Pod:	build-secret-1-build
Strategy:	Source
URL:		https://github.com/wzheng1/build-secret.git
Build Secrets:	/root/test->/destination/dir
From Image:	DockerImage registry.access.redhat.com/rhscl/ruby-22-rhel7:latest
Output to:	ImageStreamTag build-secret:latest
Push Secret:	builder-dockercfg-4jfnh
Status:		New (Failed to create build pod: Pod "build-secret-1-build" is invalid: [spec.volumes[2].name: invalid value '/root/test-build', Details: must be a DNS label (at most 63 characters, matching regex [a-z0-9]([-a-z0-9]*[a-z0-9])?): e.g. "my-name", spec.containers[0].volumeMounts[2].name: not found '/root/test-build'].)
Events:
  FirstSeen	LastSeen	Count	From			SubobjectPath	Type		Reason			Message
  ---------	--------	-----	----			-------------	--------	------			-------
  15s		15s		1	{build-controller }			Warning		HandleBuildError	Build has error: failed to create build pod: Pod "build-secret-1-build" is invalid: [spec.volumes[2].name: invalid value '/root/test-build', Details: must be a DNS label (at most 63 characters, matching regex [a-z0-9]([-a-z0-9]*[a-z0-9])?): e.g. "my-name", spec.containers[0].volumeMounts[2].name: not found '/root/test-build']
  15s		1s		8	{build-controller }			Warning		FailedCreate		Error creating: Pod "build-secret-1-build" is invalid: [spec.volumes[2].name: invalid value '/root/test-build', Details: must be a DNS label (at most 63 characters, matching regex [a-z0-9]([-a-z0-9]*[a-z0-9])?): e.g. "my-name", spec.containers[0].volumeMounts[2].name: not found '/root/test-build']


Expected results:
It should show clear warning on local file cannot be used as secret input for build-secret right when creating resources.

Additional info: