Move openssh-server to its own module. Move the key onto the systemid device.

server/build_image.py

@@ -60,7 +60,6 @@ class ImageBuilder(object):
     'iputils-ping',
     'linux-firmware',
     'linux-firmware-nonfree',
-    'openssh-server',
     'ubuntu-minimal',
     'ubuntu-standard',
     'user-setup',

server/modules/openssh.py

@@ -0,0 +1,43 @@
+#!/usr/bin/python3
+
+import argparse
+import glob
+import os
+import subprocess
+
+
+parser = argparse.ArgumentParser(description='iconograph openssh')
+parser.add_argument(
+    '--chroot-path',
+    dest='chroot_path',
+    action='store',
+    required=True)
+FLAGS = parser.parse_args()
+
+
+def Exec(*args, **kwargs):
+  print('+', args)
+  subprocess.check_call(args, **kwargs)
+
+
+def ExecChroot(*args, **kwargs):
+  Exec('chroot', FLAGS.chroot_path, *args, **kwargs)
+
+
+def main():
+  ExecChroot(
+      'apt-get',
+      'install',
+      '--assume-yes',
+      'openssh-server')
+
+  for path in glob.glob(os.path.join(FLAGS.chroot_path, 'etc', 'ssh', 'ssh_host_*')):
+    os.unlink(path)
+
+  os.symlink(
+      '/systemid/ssh_host_ed25519_key',
+      os.path.join(FLAGS.chroot_path, 'etc', 'ssh', 'ssh_host_ed25519_key'))
+
+
+if __name__ == '__main__':
+  main()