Contrib: Hook to verify modules match assembled fragments

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diff --git a/hack/hooks/README.md b/hack/hooks/README.md
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+# OpenShift-Ansible Git Hooks
+
+## Introduction
+
+This `hack` sub-directory holds
+[git commit hooks](https://www.atlassian.com/git/tutorials/git-hooks#conceptual-overview)
+you may use when working on openshift-ansible contributions. See the
+README in each sub-directory for an overview of what each hook does
+and if the hook has any specific usage or setup instructions.
+
+## Usage
+
+Basic git hook usage is simple:
+
+1) Copy (or symbolic link) the hook to the `$REPO_ROOT/.git/hooks/` directory
+2) Make the hook executable (`chmod +x $PATH_TO_HOOK`)
+
+## Multiple Hooks of the Same Type
+
+If you want to install multiple hooks of the same type, for example:
+multiple `pre-commit` hooks, you will need some kind of *hook
+dispatcher*. For an example of an easy to use hook dispatcher check
+out this gist by carlos-jenkins:
+
+* [multihooks.py](https://gist.github.com/carlos-jenkins/89da9dcf9e0d528ac978311938aade43)
+
+## Contributing Hooks
+
+If you want to contribute a new hook there are only a few criteria
+that must be met:
+
+* The hook **MUST** include a README describing the purpose of the hook
+* The README **MUST** describe special setup instructions if they are required
+* The hook **MUST** be in a sub-directory of this directory
+* The hook file **MUST** be named following the standard git hook
+  naming pattern (i.e., pre-commit hooks **MUST** be called
+  `pre-commit`)
diff --git a/hack/hooks/verify_generated_modules/README.md b/hack/hooks/verify_generated_modules/README.md
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+# Verify Generated Modules
+
+Pre-commit hook for verifying that generated library modules match
+their EXPECTED content. Library modules are generated from fragments
+under the `roles/lib_(openshift|utils)/src/` directories.
+
+If the attempted commit modified files under the
+`roles/lib_(openshift|utils)/` directories this script will run the
+`generate.py --verify` command.
+
+This script will **NOT RUN** if module source fragments are modified
+but *not part of the commit*. I.e., you can still make commits if you
+modified module fragments AND other files but are *not comitting the
+the module fragments*.
+
+# Setup Instructions
+
+Standard installation procedure. Copy the hook to the `.git/hooks/`
+directory and ensure it is executable.
diff --git a/hack/hooks/verify_generated_modules/pre-commit b/hack/hooks/verify_generated_modules/pre-commit
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+#!/bin/sh
+
+######################################################################
+# Pre-commit hook for verifying that generated library modules match
+# their EXPECTED content. Library modules are generated from fragments
+# under the 'roles/lib_(openshift|utils)/src/' directories.
+#
+# If the attempted commit modified files under the
+# 'roles/lib_(openshift|utils)/' directories this script will run the
+# 'generate.py --verify' command.
+#
+# This script will NOT RUN if module source fragments are modified but
+# not part of the commit. I.e., you can still make commits if you
+# modified module fragments AND other files but are not comitting the
+# the module fragments.
+
+# Did the commit modify any source module files?
+CHANGES=`git diff-index --stat --cached HEAD | grep -E '^ roles/lib_(openshift|utils)/src/(class|doc|ansible|lib)/'`
+RET_CODE=$?
+ABORT=0
+
+if [ "${RET_CODE}" -eq "0" ]; then
+    # Modifications detected. Run the verification scripts.
+
+    # Which was it?
+    if $(echo $CHANGES | grep -q 'roles/lib_openshift/'); then
+	echo "Validating lib_openshift..."
+	./roles/lib_openshift/src/generate.py --verify
+	if [ "${?}" -ne "0" ]; then
+	    ABORT=1
+	fi
+    fi
+
+    if $(echo $CHANGES | grep -q 'roles/lib_utils/'); then
+	echo "Validating lib_utils..."
+	./roles/lib_utils/src/generate.py --verify
+	if [ "${?}" -ne "0" ]; then
+	    ABORT=1
+	fi
+    fi
+
+    if [ "${ABORT}" -eq "1" ]; then
+	cat <<EOF
+
+ERROR: Module verification failed. Generated files do not match fragments.
+
+Choices to continue:
+  1) Run './roles/lib_(openshift|utils)/src/generate.py' from the root of
+     the repo to regenerate the files
+  2) Skip verification with '--no-verify' option to 'git commit'
+EOF
+    fi
+fi
+
+exit $ABORT