Initial hotplug support (#936)

Adds a udev script which will invoke a hotplug hook script on all net
add events. The script will write some udev arguments to a systemd FIFO
socket (to ensure we have only instance of cloud-init running at a
time), which is then read by a new service that calls a new 'cloud-init
devel hotplug-hook' command to handle the new event.

This hotplug-hook command will:
- Fetch the pickled datsource
- Verify that the hotplug event is supported/enabled
- Update the metadata for the datasource
- Ensure the hotplugged device exists within the datasource
- Apply the config change on the datasource metadata
- Bring up the new interface (or apply global network configuration)
- Save the updated metadata back to the pickle cache

Also scattered in some unrelated typing where helpful

1 files changed, 2 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index dcbe0843..7fa03e63 100755
--- a/setup.py
+++ b/setup.py
@@ -128,6 +128,7 @@ INITSYS_FILES = {
     'systemd': [render_tmpl(f)
                 for f in (glob('systemd/*.tmpl') +
                           glob('systemd/*.service') +
+                          glob('systemd/*.socket') +
                           glob('systemd/*.target'))
                 if (is_f(f) and not is_generator(f))],
     'systemd.generators': [
@@ -249,6 +250,7 @@ data_files = [
     (ETC + '/cloud/cloud.cfg.d', glob('config/cloud.cfg.d/*')),
     (ETC + '/cloud/templates', glob('templates/*')),
     (USR_LIB_EXEC + '/cloud-init', ['tools/ds-identify',
+                                    'tools/hook-hotplug',
                                     'tools/uncloud-init',
                                     'tools/write-ssh-key-fingerprints']),
     (USR + '/share/bash-completion/completions',