[Buildroot] [git commit branch/next] package/busybox: add systemd service for telnetd

[Yann E. MORIN]

commit: https://git.buildroot.net/buildroot/commit/?id=e1ddac352de6c86511a1a27efd8e79495519bcd8
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

Signed-off-by: Sam Voss <sam.voss at collins.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
[yann.morin.1998 at free.fr:
  - introduce BUSYBOX_INSTALL_TELNET_SERVICE
  - move _INSTALL_INIT_SYSTEMD alphabetically between openrc and sysv
  - drop the comment about Type=simple  (Arnout)
]
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
 package/busybox/busybox.mk      | 10 ++++++++++
 package/busybox/telnetd.service | 10 ++++++++++
 2 files changed, 20 insertions(+)

diff --git a/package/busybox/busybox.mk b/package/busybox/busybox.mk
index 4b1fbade1d..560c4fe7b6 100644
--- a/package/busybox/busybox.mk
+++ b/package/busybox/busybox.mk
@@ -332,6 +332,12 @@ define BUSYBOX_INSTALL_TELNET_SCRIPT
 			$(TARGET_DIR)/etc/init.d/S50telnet ; \
 	fi
 endef
+define BUSYBOX_INSTALL_TELNET_SERVICE
+	if grep -q CONFIG_FEATURE_TELNETD_STANDALONE=y $(@D)/.config; then \
+		$(INSTALL) -D -m 0644 package/busybox/telnetd.service \
+			$(TARGET_DIR)/usr/lib/systemd/system/telnetd.service ; \
+	fi
+endef
 
 # Add /bin/{a,hu}sh to /etc/shells otherwise some login tools like dropbear
 # can reject the user connection. See man shells.
@@ -384,6 +390,10 @@ define BUSYBOX_INSTALL_INIT_OPENRC
 	$(BUSYBOX_INSTALL_TELNET_SCRIPT)
 endef
 
+define BUSYBOX_INSTALL_INIT_SYSTEMD
+	$(BUSYBOX_INSTALL_TELNET_SERVICE)
+endef
+
 define BUSYBOX_INSTALL_INIT_SYSV
 	$(BUSYBOX_INSTALL_MDEV_SCRIPT)
 	$(BUSYBOX_INSTALL_LOGGING_SCRIPT)
diff --git a/package/busybox/telnetd.service b/package/busybox/telnetd.service
new file mode 100644
index 0000000000..8a640b761f
--- /dev/null
+++ b/package/busybox/telnetd.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Telnetd Service
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/sbin/telnetd -F
+
+[Install]
+WantedBy=multi-user.target