Add systemd unit files for the AUR sshd

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

INSTALL

@@ -37,6 +37,9 @@ Setup on Arch Linux
    # useradd -U -d /srv/http/aur -c 'AUR user' aur
    # chown aur:aur /srv/http/aur/.ssh/
 
-8) Run the sshd as the new user.
+8) Add, enable and start systemd unit files for the new sshd:
 
-   $ /srv/http/aur/openssh/sshd -f /srv/http/aur/.ssh/sshd_config
+   # cp /srv/http/aur/conf/aur-sshd.socket /etc/systemd/system/
+   # cp /srv/http/aur/conf/aur-sshd@.service /etc/systemd/system/
+   # systemctl enable aur-sshd.socket
+   # systemctl start aur-sshd.socket

conf/aur-sshd.socket

+[Socket]
+ListenStream=2222
+Accept=yes
+
+[Install]
+WantedBy=sockets.target

conf/aur-sshd@.service

+[Unit]
+Description=AUR OpenSSH Per-Connection Daemon
+
+[Service]
+ExecStart=-/srv/http/aur/openssh/sshd -i -f /srv/http/aur/.ssh/sshd_config
+User=aur
+StandardInput=socket
+StandardError=syslog