Adds packages for test SA-05

Signed-off-by: garciaale <agarcia@whitestack.com>

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/config.yaml

+"options":
+  "ssh-hostname":
+    "type": "string"
+    "default": ""
+    "description": "The hostname or IP address of the machine to"
+  "ssh-username":
+    "type": "string"
+    "default": ""
+    "description": "The username to login as."
+  "ssh-password":
+    "type": "string"
+    "default": ""
+    "description": "The password used to authenticate."
+  "ssh-private-key":
+    "type": "string"
+    "default": ""
+    "description": "DEPRECATED. The private ssh key to be used to authenticate."
+  "ssh-public-key":
+    "type": "string"
+    "default": ""
+    "description": "The public key of this unit."
+  "ssh-key-type":
+    "type": "string"
+    "default": "rsa"
+    "description": "The type of encryption to use for the SSH key."
+  "ssh-key-bits":
+    "type": "int"
+    "default": !!int "4096"
+    "description": "The number of bits to use for the SSH key."
+  "string-option":
+    "type": "string"
+    "default": "Default Value"
+    "description": "A short description of the configuration option"
+  "boolean-option":
+    "type": "boolean"
+    "default": !!bool "false"
+    "description": "A short description of the configuration option"
+  "int-option":
+    "type": "int"
+    "default": !!int "9001"
+    "description": "A short description of the configuration option"

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/copyright

+Format: http://dep.debian.net/deps/dep5/
+
+Files: *
+Copyright: Copyright 2015-2017, Canonical Ltd., All Rights Reserved.
+License: Apache License 2.0
+ 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.

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/copyright.layer-options

+Format: http://dep.debian.net/deps/dep5/
+
+Files: *
+Copyright: Copyright 2015-2017, Canonical Ltd., All Rights Reserved.
+License: Apache License 2.0
+ 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.

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/collect-metrics

+#!/usr/bin/env python3
+"""Handle the collect-metrics hook via proxy.
+
+The normal metrics layer will only execute metrics collection against the local
+machine. This hook implements the same approach, but runs the collection code
+against the configured ssh proxy.
+
+Because the metrics hook runs in a restricted context, it can't be run as a
+normal reactive event, nor can it access things like config.
+"""
+
+import os
+import shlex
+from subprocess import check_call, CalledProcessError
+import sys
+import yaml
+
+# Load modules from $CHARM_DIR/lib
+sys.path.append('lib')
+import charms.sshproxy
+
+
+def build_command(doc):
+    """Build the commands to report metrics.
+
+    Build a list of `add-metric` commands to report the current metrics
+    back to the Juju controller.
+    """
+    values = {}
+    metrics = doc.get("metrics", {})
+    for metric, mdoc in metrics.items():
+        cmd = mdoc.get("command")
+        if cmd:
+            try:
+                value, err = charms.sshproxy._run(
+                    # The command may contain quotes that need to be preserved,
+                    # i.e., `awk '{print $1}' /proc/uptime`
+                    shlex.split(cmd, posix=False)
+                )
+            except Exception as e:
+                # Ignore all errors
+                with open("metrics.log", "a") as f:
+                    f.write("{}".format(e))
+                continue
+
+            value = value.strip()
+            if value:
+                values[metric] = value
+
+    if not values:
+        return None
+    command = ["add-metric"]
+    for metric, value in values.items():
+        command.append("%s=%s" % (metric, value))
+    return command
+
+
+if __name__ == '__main__':
+    charm_dir = os.path.dirname(os.path.abspath(os.path.join(__file__, "..")))
+    metrics_yaml = os.path.join(charm_dir, "metrics.yaml")
+    with open(metrics_yaml) as f:
+        doc = yaml.load(f)
+        command = build_command(doc)
+        if command:
+            check_call(command)

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/config-changed

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/hook.template

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/install

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/leader-elected

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/leader-settings-changed

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/post-series-upgrade

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/pre-series-upgrade

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/start

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/stop

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/update-status

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/hooks/upgrade-charm

+#!/usr/bin/env python3
+
+# Load modules from $JUJU_CHARM_DIR/lib
+import sys
+sys.path.append('lib')
+
+from charms.layer import basic  # noqa
+basic.bootstrap_charm_deps()
+
+from charmhelpers.core import hookenv  # noqa
+hookenv.atstart(basic.init_config_states)
+hookenv.atexit(basic.clear_config_states)
+
+
+# This will load and run the appropriate @hook and other decorated
+# handlers from $JUJU_CHARM_DIR/reactive, $JUJU_CHARM_DIR/hooks/reactive,
+# and $JUJU_CHARM_DIR/hooks/relations.
+#
+# See https://jujucharms.com/docs/stable/authors-charm-building
+# for more information on this pattern.
+from charms.reactive import main  # noqa
+main()

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ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/layer.yaml

+"includes":
+- "layer:options"
+- "layer:basic"
+- "layer:sshproxy"
+- "layer:vnfproxy"
+"options":
+  "basic":
+    "use_venv": !!bool "false"
+    "packages": []
+    "python_packages": []
+    "include_system_packages": !!bool "true"
+  "testmetrics": {}
+  "vnfproxy": {}
+  "sshproxy": {}
+"is": "testmetrics"

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/lib/charms/layer/__init__.py

+import sys
+from importlib import import_module
+from pathlib import Path
+
+
+def import_layer_libs():
+    """
+    Ensure that all layer libraries are imported.
+
+    This makes it possible to do the following:
+
+        from charms import layer
+
+        layer.foo.do_foo_thing()
+
+    Note: This function must be called after bootstrap.
+    """
+    for module_file in Path('lib/charms/layer').glob('*'):
+        module_name = module_file.stem
+        if module_name in ('__init__', 'basic', 'execd') or not (
+            module_file.suffix == '.py' or module_file.is_dir()
+        ):
+            continue
+        import_module('charms.layer.{}'.format(module_name))
+
+
+# Terrible hack to support the old terrible interface.
+# Try to get people to call layer.options.get() instead so
+# that we can remove this garbage.
+# Cribbed from https://stackoverfLow.com/a/48100440/4941864
+class OptionsBackwardsCompatibilityHack(sys.modules[__name__].__class__):
+    def __call__(self, section=None, layer_file=None):
+        if layer_file is None:
+            return self.get(section=section)
+        else:
+            return self.get(section=section,
+                            layer_file=Path(layer_file))
+
+
+def patch_options_interface():
+    from charms.layer import options
+    if sys.version_info.minor >= 5:
+        options.__class__ = OptionsBackwardsCompatibilityHack
+    else:
+        # Py 3.4 doesn't support changing the __class__, so we have to do it
+        # another way.  The last line is needed because we already have a
+        # reference that doesn't get updated with sys.modules.
+        name = options.__name__
+        hack = OptionsBackwardsCompatibilityHack(name)
+        hack.get = options.get
+        sys.modules[name] = hack
+        sys.modules[__name__].options = hack
+
+
+try:
+    patch_options_interface()
+except ImportError:
+    # This may fail if pyyaml hasn't been installed yet. But in that
+    # case, the bootstrap logic will try it again once it has.
+    pass

ubuntuvm_vnfmetric_autoscale_vnf/charms/testmetrics/lib/charms/layer/basic.py

+import os
+import sys
+import shutil
+from glob import glob
+from subprocess import check_call, CalledProcessError
+from time import sleep
+
+from charms import layer
+from charms.layer.execd import execd_preinstall
+
+
+def lsb_release():
+    """Return /etc/lsb-release in a dict"""
+    d = {}
+    with open('/etc/lsb-release', 'r') as lsb:
+        for l in lsb:
+            k, v = l.split('=')
+            d[k.strip()] = v.strip()
+    return d
+
+
+def bootstrap_charm_deps():
+    """
+    Set up the base charm dependencies so that the reactive system can run.
+    """
+    # execd must happen first, before any attempt to install packages or
+    # access the network, because sites use this hook to do bespoke
+    # configuration and install secrets so the rest of this bootstrap
+    # and the charm itself can actually succeed. This call does nothing
+    # unless the operator has created and populated $JUJU_CHARM_DIR/exec.d.
+    execd_preinstall()
+    # ensure that $JUJU_CHARM_DIR/bin is on the path, for helper scripts
+    charm_dir = os.environ['JUJU_CHARM_DIR']
+    os.environ['PATH'] += ':%s' % os.path.join(charm_dir, 'bin')
+    venv = os.path.abspath('../.venv')
+    vbin = os.path.join(venv, 'bin')
+    vpip = os.path.join(vbin, 'pip')
+    vpy = os.path.join(vbin, 'python')
+    hook_name = os.path.basename(sys.argv[0])
+    is_bootstrapped = os.path.exists('wheelhouse/.bootstrapped')
+    is_charm_upgrade = hook_name == 'upgrade-charm'
+    is_series_upgrade = hook_name == 'post-series-upgrade'
+    post_upgrade = os.path.exists('wheelhouse/.upgrade')
+    is_upgrade = not post_upgrade and (is_charm_upgrade or is_series_upgrade)
+    if is_bootstrapped and not is_upgrade:
+        activate_venv()
+        # the .upgrade file prevents us from getting stuck in a loop
+        # when re-execing to activate the venv; at this point, we've
+        # activated the venv, so it's safe to clear it
+        if post_upgrade:
+            os.unlink('wheelhouse/.upgrade')
+        return
+    if is_series_upgrade and os.path.exists(venv):
+        # series upgrade should do a full clear of the venv, rather than just
+        # updating it, to bring in updates to Python itself
+        shutil.rmtree(venv)
+    if is_upgrade:
+        if os.path.exists('wheelhouse/.bootstrapped'):
+            os.unlink('wheelhouse/.bootstrapped')
+        open('wheelhouse/.upgrade', 'w').close()
+    # bootstrap wheelhouse
+    if os.path.exists('wheelhouse'):
+        with open('/root/.pydistutils.cfg', 'w') as fp:
+            # make sure that easy_install also only uses the wheelhouse
+            # (see https://github.com/pypa/pip/issues/410)
+            fp.writelines([
+                "[easy_install]\n",
+                "allow_hosts = ''\n",
+                "find_links = file://{}/wheelhouse/\n".format(charm_dir),
+            ])
+        apt_install([
+            'python3-pip',
+            'python3-setuptools',
+            'python3-yaml',
+            'python3-dev',
+            'python3-wheel',
+            'build-essential',
+        ])
+        from charms.layer import options
+        cfg = options.get('basic')
+        # include packages defined in layer.yaml
+        apt_install(cfg.get('packages', []))
+        # if we're using a venv, set it up
+        if cfg.get('use_venv'):
+            if not os.path.exists(venv):
+                series = lsb_release()['DISTRIB_CODENAME']
+                if series in ('precise', 'trusty'):
+                    apt_install(['python-virtualenv'])
+                else:
+                    apt_install(['virtualenv'])
+                cmd = ['virtualenv', '-ppython3', '--never-download', venv]
+                if cfg.get('include_system_packages'):
+                    cmd.append('--system-site-packages')
+                check_call(cmd)
+            os.environ['PATH'] = ':'.join([vbin, os.environ['PATH']])
+            pip = vpip
+        else:
+            pip = 'pip3'
+            # save a copy of system pip to prevent `pip3 install -U pip`
+            # from changing it
+            if os.path.exists('/usr/bin/pip'):
+                shutil.copy2('/usr/bin/pip', '/usr/bin/pip.save')
+        # need newer pip, to fix spurious Double Requirement error:
+        # https://github.com/pypa/pip/issues/56
+        check_call([pip, 'install', '-U', '--no-index', '-f', 'wheelhouse',
+                    'pip'])
+        # per https://github.com/juju-solutions/layer-basic/issues/110
+        # this replaces the setuptools that was copied over from the system on
+        # venv create with latest setuptools and adds setuptools_scm
+        check_call([pip, 'install', '-U', '--no-index', '-f', 'wheelhouse',
+                    'setuptools', 'setuptools-scm'])
+        # install the rest of the wheelhouse deps
+        check_call([pip, 'install', '-U', '--no-index', '-f', 'wheelhouse'] +
+                   glob('wheelhouse/*'))
+        # re-enable installation from pypi
+        os.remove('/root/.pydistutils.cfg')
+        # install python packages from layer options
+        if cfg['python_packages']:
+            check_call([pip, 'install', '-U'] + cfg['python_packages'])
+        if not cfg.get('use_venv'):
+            # restore system pip to prevent `pip3 install -U pip`
+            # from changing it
+            if os.path.exists('/usr/bin/pip.save'):
+                shutil.copy2('/usr/bin/pip.save', '/usr/bin/pip')
+                os.remove('/usr/bin/pip.save')
+        # setup wrappers to ensure envs are used for scripts
+        shutil.copy2('bin/charm-env', '/usr/local/sbin/')
+        for wrapper in ('charms.reactive', 'charms.reactive.sh',
+                        'chlp', 'layer_option'):
+            src = os.path.join('/usr/local/sbin', 'charm-env')
+            dst = os.path.join('/usr/local/sbin', wrapper)
+            if not os.path.exists(dst):
+                os.symlink(src, dst)
+        if cfg.get('use_venv'):
+            shutil.copy2('bin/layer_option', vbin)
+        else:
+            shutil.copy2('bin/layer_option', '/usr/local/bin/')
+        # re-link the charm copy to the wrapper in case charms
+        # call bin/layer_option directly (as was the old pattern)
+        os.remove('bin/layer_option')
+        os.symlink('/usr/local/sbin/layer_option', 'bin/layer_option')
+        # flag us as having already bootstrapped so we don't do it again
+        open('wheelhouse/.bootstrapped', 'w').close()
+        # Ensure that the newly bootstrapped libs are available.
+        # Note: this only seems to be an issue with namespace packages.
+        # Non-namespace-package libs (e.g., charmhelpers) are available
+        # without having to reload the interpreter. :/
+        reload_interpreter(vpy if cfg.get('use_venv') else sys.argv[0])
+
+
+def activate_venv():
+    """
+    Activate the venv if enabled in ``layer.yaml``.
+
+    This is handled automatically for normal hooks, but actions might
+    need to invoke this manually, using something like:
+
+        # Load modules from $JUJU_CHARM_DIR/lib
+        import sys
+        sys.path.append('lib')
+
+        from charms.layer.basic import activate_venv
+        activate_venv()
+
+    This will ensure that modules installed in the charm's
+    virtual environment are available to the action.
+    """
+    from charms.layer import options
+    venv = os.path.abspath('../.venv')
+    vbin = os.path.join(venv, 'bin')
+    vpy = os.path.join(vbin, 'python')
+    use_venv = options.get('basic', 'use_venv')
+    if use_venv and '.venv' not in sys.executable:
+        # activate the venv
+        os.environ['PATH'] = ':'.join([vbin, os.environ['PATH']])
+        reload_interpreter(vpy)
+    layer.patch_options_interface()
+    layer.import_layer_libs()
+
+
+def reload_interpreter(python):
+    """
+    Reload the python interpreter to ensure that all deps are available.
+
+    Newly installed modules in namespace packages sometimes seemt to
+    not be picked up by Python 3.
+    """
+    os.execve(python, [python] + list(sys.argv), os.environ)
+
+
+def apt_install(packages):
+    """
+    Install apt packages.
+
+    This ensures a consistent set of options that are often missed but
+    should really be set.
+    """
+    if isinstance(packages, (str, bytes)):
+        packages = [packages]
+
+    env = os.environ.copy()
+
+    if 'DEBIAN_FRONTEND' not in env:
+        env['DEBIAN_FRONTEND'] = 'noninteractive'
+
+    cmd = ['apt-get',
+           '--option=Dpkg::Options::=--force-confold',
+           '--assume-yes',
+           'install']
+    for attempt in range(3):
+        try:
+            check_call(cmd + packages, env=env)
+        except CalledProcessError:
+            if attempt == 2:  # third attempt
+                raise
+            try:
+                # sometimes apt-get update needs to be run
+                check_call(['apt-get', 'update'])
+            except CalledProcessError:
+                # sometimes it's a dpkg lock issue
+                pass
+            sleep(5)
+        else:
+            break
+
+
+def init_config_states():
+    import yaml
+    from charmhelpers.core import hookenv
+    from charms.reactive import set_state
+    from charms.reactive import toggle_state
+    config = hookenv.config()
+    config_defaults = {}
+    config_defs = {}
+    config_yaml = os.path.join(hookenv.charm_dir(), 'config.yaml')
+    if os.path.exists(config_yaml):
+        with open(config_yaml) as fp:
+            config_defs = yaml.safe_load(fp).get('options', {})
+            config_defaults = {key: value.get('default')
+                               for key, value in config_defs.items()}
+    for opt in config_defs.keys():
+        if config.changed(opt):
+            set_state('config.changed')
+            set_state('config.changed.{}'.format(opt))
+        toggle_state('config.set.{}'.format(opt), config.get(opt))
+        toggle_state('config.default.{}'.format(opt),
+                     config.get(opt) == config_defaults[opt])
+
+
+def clear_config_states():
+    from charmhelpers.core import hookenv, unitdata
+    from charms.reactive import remove_state
+    config = hookenv.config()
+    remove_state('config.changed')
+    for opt in config.keys():
+        remove_state('config.changed.{}'.format(opt))
+        remove_state('config.set.{}'.format(opt))
+        remove_state('config.default.{}'.format(opt))
+    unitdata.kv().flush()