From efc8653ecd567197ef60ebd3386ffd77d5b74a4d Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Mon, 21 Dec 2015 09:24:18 +0100
Subject: make systemd unit require the network device

---
 Makefile                  |  2 +-
 dyndhcpd@.service         | 13 -------------
 systemd/dyndhcpd@.service | 14 ++++++++++++++
 3 files changed, 15 insertions(+), 14 deletions(-)
 delete mode 100644 dyndhcpd@.service
 create mode 100644 systemd/dyndhcpd@.service

diff --git a/Makefile b/Makefile
index 0553e0f..5ac0a4e 100644
--- a/Makefile
+++ b/Makefile
@@ -30,9 +30,9 @@ install: install-bin install-doc
 
 install-bin: dyndhcpd
 	$(INSTALL) -D -m0755 dyndhcpd $(DESTDIR)/usr/bin/dyndhcpd
-	$(INSTALL) -D -m0644 dyndhcpd@.service $(DESTDIR)/usr/lib/systemd/system/dyndhcpd@.service
 	$(INSTALL) -D -m0644 config/dhcpd.conf $(DESTDIR)/etc/dyndhcpd/dhcpd.conf
 	$(INSTALL) -D -m0644 config/ipxe-options.conf $(DESTDIR)/etc/dyndhcpd/ipxe-options.conf
+	$(INSTALL) -D -m0644 systemd/dyndhcpd@.service $(DESTDIR)/usr/lib/systemd/system/dyndhcpd@.service
 
 install-doc: README.html
 	$(INSTALL) -D -m0644 README.md $(DESTDIR)/usr/share/doc/dyndhcpd/README.md
diff --git a/dyndhcpd@.service b/dyndhcpd@.service
deleted file mode 100644
index ce49fd8..0000000
--- a/dyndhcpd@.service
+++ /dev/null
@@ -1,13 +0,0 @@
-[Unit]
-Description=IPv4 DHCP server for interface %i
-After=network.target
-
-[Service]
-ExecStart=/usr/bin/dyndhcpd -i%i
-ProtectSystem=full
-ProtectHome=on
-PrivateDevices=on
-NoNewPrivileges=on
-
-[Install]
-WantedBy=multi-user.target
diff --git a/systemd/dyndhcpd@.service b/systemd/dyndhcpd@.service
new file mode 100644
index 0000000..8eb1867
--- /dev/null
+++ b/systemd/dyndhcpd@.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=IPv4 DHCP server for interface %i
+After=network.target
+Requires=sys-subsystem-net-devices-%i.device
+
+[Service]
+ExecStart=/usr/bin/dyndhcpd -i%i
+ProtectSystem=full
+ProtectHome=on
+PrivateDevices=on
+NoNewPrivileges=on
+
+[Install]
+WantedBy=multi-user.target
-- 
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