Initial version of SteamOS kdump

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

kdump_collect.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+#
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  Copyright (c) 2021 Valve.
+#
+#  Kdump script that should effectively collect the core dump/dmesg from
+#  within a Dracut-generated initramfs on SteamOS kdump.
+#  The most fail-prone operations are guarded with conditionals to bail
+#  in case we indeed fail - worst thing here would be to have a bad condition
+#  and get stuck in this minimal initramfs with no output for the user.
+#
+
+. /usr/lib/kdump/kdump.etc
+
+VMCORE="/proc/vmcore"
+KDUMP_TIMESTAMP=$(date +"%Y%m%d%H%M")
+KDUMP_FOLDER="/kdump_path/${KDUMP_FOLDER}/crash/${KDUMP_TIMESTAMP}"
+
+# Bail out in case we don't have a vmcore, i.e. either we're not kdumping
+# or something is pretty wrong and we wouldn't be able to progress.
+#
+if [ ! -f $VMCORE ]; then
+	reboot -f
+fi
+
+mkdir -p "/kdump_path"
+if ! mount "/dev/${MOUNT_DEVNODE}" /kdump_path; then
+	reboot -f
+fi
+
+mkdir -p "${KDUMP_FOLDER}"
+
+/usr/lib/kdump/makedumpfile ${MAKEDUMPFILE_DMESG_CMD} $VMCORE "${KDUMP_FOLDER}/dmesg.txt"
+sync "${KDUMP_FOLDER}/dmesg.txt"
+
+if [ ${FULL_COREDUMP} -ne 0 ]; then
+	/usr/lib/kdump/makedumpfile ${MAKEDUMPFILE_COREDUMP_CMD} $VMCORE "${KDUMP_FOLDER}/vmcore.compressed"
+	sync "${KDUMP_FOLDER}/vmcore.compressed"
+fi
+
+umount "/dev/${MOUNT_DEVNODE}"
+sync
+
+reboot -f