From 523aea31bb7a705860f488f3431dc20745c31c48 Mon Sep 17 00:00:00 2001
From: Luka Pivk <luka.pivk@toradex.com>
Date: Fri, 6 Mar 2020 16:01:52 +0100
Subject: hostname: generate a uniqe hostname on boot

This will generate a hostname based on machine name and serial number.
(E.g. colibri-imx7-031111777)
If serial number is not found it will say "no-serial-number" in host
name.
If machine is not supported hostname will include "unsupported-device"
string.
If /dev/device-tree does not exist it will say "recovery-mode"
as it assumes its in recovery mode of Toradex Easy Installer

To prevent openembedded from creating /etc/hostname file
add hostname_pn-base-files = "" to configration

Related-to: TEI-100, ELB-1322
Signed-off-by: Luka Pivk <luka.pivk@toradex.com>
---
 .../set-hostname/files/set-hostname.service        | 13 ++++++++++
 recipes-core/set-hostname/files/sethostname        | 19 ++++++++++++++
 recipes-core/set-hostname/set-hostname_1.0.bb      | 30 ++++++++++++++++++++++
 3 files changed, 62 insertions(+)
 create mode 100644 recipes-core/set-hostname/files/set-hostname.service
 create mode 100644 recipes-core/set-hostname/files/sethostname
 create mode 100644 recipes-core/set-hostname/set-hostname_1.0.bb

diff --git a/recipes-core/set-hostname/files/set-hostname.service b/recipes-core/set-hostname/files/set-hostname.service
new file mode 100644
index 0000000..306528b
--- /dev/null
+++ b/recipes-core/set-hostname/files/set-hostname.service
@@ -0,0 +1,13 @@
+[Unit]
+ConditionPathExists=|!/etc/hostname
+Wants=network-pre.target
+Before=network-pre.target
+After=local-fs.target
+After=sys-subsystem-net-devices-eth0.device
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/sethostname
+
+[Install]
+WantedBy=network.target
diff --git a/recipes-core/set-hostname/files/sethostname b/recipes-core/set-hostname/files/sethostname
new file mode 100644
index 0000000..87e6320
--- /dev/null
+++ b/recipes-core/set-hostname/files/sethostname
@@ -0,0 +1,19 @@
+#!/bin/sh
+if [ ! -f /proc/device-tree/serial-number ]; then
+    serial="recovery-mode"
+else
+    serial=$(tr -d '\0' </proc/device-tree/serial-number)
+
+    #if serial number is empty we append no-serial-number string
+    if [ -z "$serial" -a "$serial" != " "  ]; then
+        serial="no-serial-number"
+    fi
+fi
+
+hostname=@@MACHINE@@"-"${serial}
+
+if [ -f /usr/bin/hostnamectl ]; then
+    /usr/bin/hostnamectl set-hostname ${hostname}
+else
+    hostname ${hostname}
+fi
diff --git a/recipes-core/set-hostname/set-hostname_1.0.bb b/recipes-core/set-hostname/set-hostname_1.0.bb
new file mode 100644
index 0000000..15fa66b
--- /dev/null
+++ b/recipes-core/set-hostname/set-hostname_1.0.bb
@@ -0,0 +1,30 @@
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
+inherit systemd
+
+SRC_URI += " \
+    file://sethostname \
+    file://set-hostname.service \
+"
+
+FILES_${PN} = " \
+    ${bindir} \
+    ${systemd_system_unitdir} \
+"
+
+SYSTEMD_SERVICE_${PN} = " \
+    set-hostname.service \
+"
+
+do_install () {
+    install -d ${D}${bindir}
+    install -m 0755 ${WORKDIR}/sethostname ${D}${bindir}
+    sed -i "s/@@MACHINE@@/${MACHINE}/g" ${D}${bindir}/sethostname
+    if ${@bb.utils.contains('DISTRO_FEATURES','systemd','true','false',d)}; then
+        install -d ${D}${systemd_system_unitdir}
+        install -m 0644 ${WORKDIR}/set-hostname.service ${D}${systemd_system_unitdir}
+    fi
+}
-- 
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