Simplify run-in-container script

After changes in k8s and sti-base/sti-python some hacks can be removed.

README.md

@@ -156,28 +156,22 @@ that make this script obsolete.
 
 Here is how you would run a command in a pod specified by label:
 
-1. Inpect the output of the command below to find the name of a pod that matches a given label:
+1. Inspect the output of the command below to find the name of a pod that matches a given label:
 
         oc get pods -l <your-label-selector>
 
-2. Open a shell in the pod of your choice:
+2. Open a shell in the pod of your choice. Because of how the images produced
+  with CentOS and RHEL work currently, we need to wrap commands with `bash` to
+  enable any Software Collections that may be used (done automatically inside
+  every bash shell).
 
         oc exec -p <pod-name> -it -- bash
 
-3. Because of how `kubectl exec` and `oc exec` work right now, your current working directory is root (/). Change it to where your code lives:
-
-        cd $HOME
-
-4. Because of how the images produced with CentOS and RHEL work currently, you need to manually enable any Software Collections you need to use:
-
-        source scl_source enable python33
-
-5. Finally, execute any command that you need and exit the shell.
+3. Finally, execute any command that you need and exit the shell.
 
 Related GitHub issues:
 1. https://github.com/GoogleCloudPlatform/kubernetes/issues/8876
-2. https://github.com/GoogleCloudPlatform/kubernetes/issues/7770
-3. https://github.com/openshift/origin/issues/2001
+2. https://github.com/openshift/origin/issues/2001
 
 
 The wrapper script combines the steps above into one. You can use it like this:

openshift/scripts/run-in-container.sh

@@ -9,9 +9,8 @@
 # that make this script obsolete.
 
 # Related GitHub issues:
-# [1] https://github.com/GoogleCloudPlatform/kubernetes/issues/8876
-# [2] https://github.com/GoogleCloudPlatform/kubernetes/issues/7770
-# [3] https://github.com/openshift/origin/issues/2001
+# - https://github.com/GoogleCloudPlatform/kubernetes/issues/8876
+# - https://github.com/openshift/origin/issues/2001
 
 
 # Usage examples:
@@ -39,5 +38,4 @@ POD_INSTANCE_NAME=`oc get pods \
   -t "{{ with index .items ${POD_INDEX:-0} }}{{ .metadata.name }}{{ end }}"`
 
 # Run command in a container of the specified pod:
-oc exec -p "$POD_INSTANCE_NAME" -it -- bash -c \
-  "cd \$HOME && source scl_source enable python33 && ${@:-echo}"
+oc exec -p "$POD_INSTANCE_NAME" -it -- bash -c "${@:-echo}"