Add a simple installer!

Sortof re-invents what debian packages do a little bit.

MANIFEST.in

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+include tljh/systemd-units/*

tljh/installer.py

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+import sys
+import os
+import tljh.systemd as systemd
+import tljh.conda as conda
+
+INSTALL_PREFIX = os.environ.get('TLJH_INSTALL_PREFIX', '/opt/tljh')
+HUB_ENV_PREFIX = os.path.join(INSTALL_PREFIX, 'hub')
+USER_ENV_PREFIX = os.path.join(INSTALL_PREFIX, 'user')
+
+HERE = os.path.abspath(os.path.dirname(__file__))
+
+
+def ensure_jupyterhub_service(prefix):
+    with open(os.path.join(HERE, 'systemd-units', 'jupyterhub.service')) as f:
+        unit_template = f.read()
+
+    unit = unit_template.format(
+        python_interpreter_path=sys.executable,
+        jupyterhub_config_path=os.path.join(HERE, 'jupyterhub_config.py'),
+        prefix=prefix
+    )
+    systemd.install_unit('jupyterhub.service', unit)
+
+
+def ensure_jupyterhub_package(prefix):
+    """
+    Install JupyterHub into our conda environment if needed.
+
+    Conda constructor does not play well with conda-forge, so we can ship this
+    with constructor
+    """
+    # FIXME: Use fully deterministic package lists here
+    conda.ensure_conda_packages(prefix, ['jupyterhub==0.9.0'])
+    conda.ensure_pip_packages(prefix, [
+        'jupyterhub-dummyauthenticator==0.3.1',
+        'jupyterhub-systemdspawner==0.9.12'
+    ])
+
+
+ensure_jupyterhub_package(HUB_ENV_PREFIX)
+ensure_jupyterhub_service(HUB_ENV_PREFIX)
+
+conda.ensure_conda_env(USER_ENV_PREFIX)
+conda.ensure_conda_packages(USER_ENV_PREFIX, [
+    'jupyterhub==0.9.0',
+    'notebook==5.5.0'
+])
+systemd.reload_daemon()
+systemd.start_service('jupyterhub')

tljh/systemd-units/jupyterhub.service

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+# Template file for JupyterHub systemd service
+# Runs both JupyterHub and ConfigurableHTTPProxy
+# Uses simple string.format() for 'templating'
+[Unit]
+Wants=network-online.target
+
+[Service]
+User=root
+Restart=always
+StateDirectory=jupyterhub
+WorkingDirectory=/var/lib/jupyterhub
+ExecStart={python_interpreter_path} -m jupyterhub.app -f {jupyterhub_config_path}