recipies-devtools: Add net-kexec package

This installs a script which is able to kexec a kernel through the network from
user space. As the proprietary bootloader is limited and does not offer such a
feature, this is a good alternative for developers.

recipes-devtools/net-kexec/files/net-kexec.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+# Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+GATEWAY=$(route | grep default | sed 's/ [ ]*/:/g' | cut -d ':' -f 2)
+
+fail() {
+    echo $1
+    exit 1
+}
+
+# If we are not already connected, connect eth0 with DHCP
+ifconfig eth0 | grep 'inet addr:[0-9]*\.[0-9]*\.[0-9]*\.[0-9]* ' >/dev/null
+if [ $? -ne 0 ]; then
+    echo "* Starting DHCP on eth0"
+    udhcpc -n -i eth0 || fail "Unable to establish a DHCP session with eth0"
+fi
+
+tftp -g -r zImage $GATEWAY >/dev/null || fail "Unable to get zImage throught TFTP"
+echo "* Found zImage on $TFTP_SERVER"
+echo -n "Do you want to reboot to the new kernel on the fly ? [y/n] "
+read boot
+
+if [ "$boot" = "y" ]; then
+    kexec -l zImage
+    kexec -e
+fi

recipes-devtools/net-kexec/net-kexec_1.0.bb

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+# Copyright (C) 2014 Romain Perier <romain.perier@gmail.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+SUMMARY = "Extremely basic script to kexec over the network"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+SRC_URI = "file://net-kexec.sh"
+
+PR = "r1"
+
+RDEPENDS_${PN} += "kexec"
+
+do_install() {
+        install -d ${D}/sbin
+        install -m 0755 ${WORKDIR}/net-kexec.sh ${D}/sbin/net-kexec
+}
+
+inherit allarch
+
+FILES_${PN} += "/sbin/net-kexec"