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diff --git a/resources/libraries/bash/function/common.sh b/resources/libraries/bash/function/common.sh
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+# Copyright (c) 2020 Cisco and/or its affiliates.
+# Copyright (c) 2020 PANTHEON.tech and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -exuo pipefail
+
+# This library defines functions used by multiple entry scripts.
+# Keep functions ordered alphabetically, please.
+
+function activate_virtualenv () {
+
+    # Update virtualenv pip package, delete and create virtualenv directory,
+    # activate the virtualenv, install requirements, set PYTHONPATH.
+
+    # Arguments:
+    # - ${1} - Path to existing directory for creating virtualenv in.
+    #          If missing or empty, ${ROOT_DIR} is used.
+    # - ${2} - Path to requirements file, ${ROOT_DIR}/requirements.txt if empty.
+    # Variables read:
+    # - ROOT_DIR - Path to existing root of local git repository.
+    # Functions called:
+    # - die - Print to stderr and exit.
+
+    set -exuo pipefail
+
+    root_path="${1-$ROOT_DIR}"
+    env_dir="${root_path}/env"
+    req_path=${2-$ROOT_DIR/requirements.txt}
+    rm -rf "${env_dir}" || die "Failed to clean previous virtualenv."
+    pip3 install virtualenv==20.0.20 || {
+        die "Virtualenv package install failed."
+    }
+    virtualenv --no-download --python=$(which python3) "${env_dir}" || {
+        die "Virtualenv creation for $(which python3) failed."
+    }
+    set +u
+    source "${env_dir}/bin/activate" || die "Virtualenv activation failed."
+    set -u
+    pip3 install -r "${req_path}" || {
+        die "Requirements installation failed."
+    }
+}
+
+
+function common_dirs () {
+
+    # Set global variables, create some directories (without touching content).
+
+    # Variables set:
+    # - BASH_FUNCTION_DIR - Path to existing directory this file is located in.
+    # - ROOT_DIR - Path to existing root of local git repository.
+    # - RESOURCES_DIR - Path to existing CSIT subdirectory "resources".
+    # Functions called:
+    # - die - Print to stderr and exit.
+
+    set -exuo pipefail
+
+    this_file=$(readlink -e "${BASH_SOURCE[0]}") || {
+        die "Some error during locating of this source file."
+    }
+    BASH_FUNCTION_DIR=$(dirname "${this_file}") || {
+        die "Some error during dirname call."
+    }
+    # Current working directory could be in a different repo, e.g. VPP.
+    pushd "${BASH_FUNCTION_DIR}" || die "Pushd failed"
+    relative_csit_dir=$(git rev-parse --show-toplevel) || {
+        die "Git rev-parse failed."
+    }
+    ROOT_DIR=$(readlink -e "${relative_csit_dir}") || die "Readlink failed."
+    popd || die "Popd failed."
+}
+
+function die () {
+
+    # Print the message to standard error end exit with error code specified
+    # by the second argument.
+    #
+    # Hardcoded values:
+    # - The default error message.
+    # Arguments:
+    # - ${1} - The whole error message, be sure to quote. Optional
+    # - ${2} - the code to exit with, default: 1.
+
+    set -x
+    set +eu
+    warn "${1:-Unspecified run-time error occurred!}"
+    exit "${2:-1}"
+}
+
+function warn () {
+
+    # Print the message to standard error.
+    #
+    # Arguments:
+    # - ${@} - The text of the message.
+
+    set -exuo pipefail
+
+    echo "$@" >&2
+}