mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
Sven Schnelle
01f74c75f5
For dasd devices, we need to enable the device before we can use it. Add the required dasd device to the kernel commandline when installing ngdump to a dasd device. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Acked-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
122 lines
2.9 KiB
Bash
Executable File
122 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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#
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# Copyright IBM Corp. 2021
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#
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# s390-tools is free software; you can redistribute it and/or modify
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# it under the terms of the MIT license. See LICENSE for details.
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#
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set -u
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DRACUT_OMIT_MODULES=(
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nfs network network-manager
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dbus dbus-broker dbus-daemon plymouth
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znet dash resume ifcfg earlykdump
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kdumpcore i18n lvm mdraid memstrack
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systemd-timedated systemd-timesyncd
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systemd-networkd systemd-network-manager systemd-coredump)
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function create_dumpfs()
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{
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[ "$dryrun" -eq 1 ] && { echo "/dev/null"; return 0; }
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mkfs -F "$device" >/dev/null || { echo "Couldn't create filesystem on $1." >&2; return 1; }
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local disk_path=/dev/disk/by-uuid/$(blkid -o value -s UUID "$device")
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for i in $(seq 0 30)
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do
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[ -e "$disk_path" ] && break;
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sleep 1
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done
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[ -e "$disk_path" ] || { echo "Filesystem device link missing." >&2; return 1; }
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echo "$disk_path"
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}
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device=$(readlink -f $1)
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disk_path=/dev/disk/by-partuuid/$(blkid -o value -s PARTUUID "$device")
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[ -e "$disk_path" ] || { echo "Couldn't find disk by PARTUUID." >&2; exit 1; }
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function get_kernel_version()
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{
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local version=$(uname -r)
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echo $version
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}
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function get_kernel_image()
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{
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local version=$1
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if [ -e "/boot/image-$version" ]; then
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# SLES kernel image
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echo "/boot/image-$version"
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else
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# Fedora/RHEL kernel image
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echo "/boot/vmlinuz-$version"
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fi
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}
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#
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# dracut is the standard tool for building initramfs images
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# on Fedora, RHEL, and SLES.
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#
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function create_initrd()
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{
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local disk=$1
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local kver=$2
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local initrd=$3
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local omit_modules=$(echo ${DRACUT_OMIT_MODULES[@]})
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command -v dracut >/dev/null ||
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{ echo "Please install dracut." >&2; return 1; }
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dracut -v --hostonly --no-hostonly-cmdline --hostonly-i18n \
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-o "$omit_modules" --add ngdump \
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--mount "$disk /ngdump ext4 defaults" \
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--kver "$kver" -f "$initrd" 2>&1
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}
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[ $# -gt 1 ] || { echo "Usage: $0 <dump partition device> <dryrun>" >&2; exit 1; }
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dasd=
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device=$(readlink -f $1)
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dryrun=$2
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type=$(lsblk -dno type "$device")
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[ "$type" != "part" ] && { echo "$device with type $type is not a partition." >&2; exit 1; }
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case "${device##*/}" in
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dasd*)
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dasd=$(dasdview -i "$1"|sed -n 's/busid\s*:\s*\([0-9a-fA-F.]\)/dasd=\1/p')
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;;
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nvme*)
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;;
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*)
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echo "Unsupported device $device." >&2
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exit 1
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;;
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esac
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disk_path=$(create_dumpfs $device)
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kernel_version=$(get_kernel_version)
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kernel=$(get_kernel_image "$kernel_version")
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[ -e "$kernel" ] || { echo "Couldn't find kernel image." >&2; exit 1; }
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initrd=$(mktemp)
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create_initrd "$disk_path" "$kernel_version" "$initrd"
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[ $? -eq 0 ] || { echo "Failed to create initramfs image" >&2; exit 1; }
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#
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# zipl expects this script to output three variables to stdout:
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# * kernel: path to bzImage file of Linux kernel
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# * initrd: path to dumper initramfs image
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# * cmdline: command-line for dumper's kernel
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#
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# The output order is irrelevant.
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#
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echo "kernel=$kernel"
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echo "initrd=$initrd"
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echo "cmdline=reset_devices cgroup_disable=memory nokaslr numa=off irqpoll nr_cpus=1 $dasd"
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exit 0
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