Inhibit sshd-keygen@.service if cloud-init is active (#1028)

In some cloud-init enabled images the sshd-keygen@.service
may race with cloud-init and prevent ssh host keys from being
generated or generating host keys twice slowing boot and  consuming
additional entropy during boot.  This drop-in unit adds a condition to
the sshd-keygen@.service which prevents running if cloud-init is active.

1 files changed, 4 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 100575ff..6e463bf8 100755
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,7 @@ def is_generator(p):
 def pkg_config_read(library, var):
     fallbacks = {
         'systemd': {
+            'systemdsystemconfdir': '/etc/systemd/system',
             'systemdsystemunitdir': '/lib/systemd/system',
             'systemdsystemgeneratordir': '/lib/systemd/system-generators',
         }
@@ -270,7 +271,9 @@ if not platform.system().endswith('BSD'):
         (ETC + '/NetworkManager/dispatcher.d/',
          ['tools/hook-network-manager']),
         (ETC + '/dhcp/dhclient-exit-hooks.d/', ['tools/hook-dhclient']),
-        (LIB + '/udev/rules.d', [f for f in glob('udev/*.rules')])
+        (LIB + '/udev/rules.d', [f for f in glob('udev/*.rules')]),
+        (ETC + '/systemd/system/sshd-keygen@.service.d/',
+         ['systemd/disable-sshd-keygen-if-cloud-init-active.conf']),
     ])
 # Use a subclass for install that handles
 # adding on the right init system configuration files