$ oc secrets new-sshauth mysecret --ssh-privatekey=.ssh/id_rsa 

$ oc create -f - <<'EOF'
kind: List
apiVersion: v1
items:
- kind: ImageStream
  apiVersion: v1
  metadata:
    name: nodejs

- kind: BuildConfig
  apiVersion: v1
  metadata:
    name: nodejs
  spec:
    output:
      to:
        kind: ImageStreamTag
        name: nodejs:latest
    source:
      type: Git
      git:
        ref: master
        uri: https://github.com/openshift/nodejs-ex.git
      sourceSecret:
        name: mysecret
    strategy:
      type: Source
      sourceStrategy:
        from:
          kind: ImageStreamTag
          name: nodejs:4
          namespace: openshift
EOF

$ oc start-build nodejs

wait...

$ oc get build nodejs-1
NAME       TYPE      FROM         STATUS                        STARTED         DURATION
nodejs-1   Source    Git@master   Failed (GenericBuildFailed)   3 minutes ago   1s

$ oc logs build/nodejs-1
error: cannot setup source secret: open : no such file or directory


Cause: the SOURCE_SECRET_PATH environment variable is missing in the build pod.