mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
Alexander Egorenkov
b4142a9966
The purpose of the new zipl helper script is to build a dumper initramfs for NGDump stand-alone dump. zipl executes the helper script when preparing a NVMe dump partition for stand-alone dump. The zipl helper script expects a single parameter - a path to the dump partition to store a dump on. The helper script terminates with 0 on success and a positive value otherwise. The zipl helper script performs the following steps: - It builds an initramfs image suitable for dumping. To perform this step, the script employs the dracut tool on Fedora/RHEL/SLES and the initramfs-tools on Ubuntu/Debian. - It outputs the path to the newly built initramfs image and the currently active kernel bzImage on the standard output. - It prints the kernel command-line to be used by the dumper on the standard output. On success, zipl expects the helper script to return at least three lines containing: - initrd=<path to an initramfs image> - kernel=<path to a kernel bzImage> - cmdline=<kernel command-line parameters> Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Tested-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
74 lines
1.7 KiB
Bash
Executable File
74 lines
1.7 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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[ $# -gt 0 ] || { echo "Usage: $0 <dump partition device>" >&2; exit 1; }
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#
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# Retrieve partition UUID
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#
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# We use PARTUUID because zipl re-formats the given partition after
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# calling us, therefore, a UUID will change.
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#
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device=$(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=$1
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echo "/boot/vmlinuz-$version"
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}
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#
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# initramfs-tools is the standard tool for building initramfs images
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# on Ubuntu and Debian.
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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=$3
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command -v mkinitramfs >/dev/null ||
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{ echo "Please install mkinitramfs." >&2; return 1; }
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NGDUMP=y NGDUMP_DEVICE="$disk" mkinitramfs -o "$initrd" "$kver" 2>&1
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}
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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"
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exit 0
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