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Avoid bootloader to run the migration
Instead of a reboot the customer should run the migration by calling run_migration. This commit adds a service utility to run the migration. The concept is based on kexec and avoids the modification to the bootloader setup. This allows more flexibility for clouds that runs instances not directly through a bootloader and also avoids infinite boot/reboot cycles in case of an early error of the migration mount service. This Fixes #108
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| #!/bin/bash | ||
| # Copyright (c) 2019 SUSE Software Solutions Germany GmbH. All rights reserved. | ||
| # | ||
| # This file is part of suse-migration-services. | ||
| # | ||
| # suse-migration-services is free software: you can redistribute it and/or | ||
| # modify it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # suse-migration-services is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with suse-migration-services. If not, see <http://www.gnu.org/licenses/> | ||
| # | ||
| # Enable shell globbing | ||
| set +o noglob | ||
|
|
||
| logfile=/var/log/migration_startup.log | ||
|
|
||
| function setup_logging { | ||
| rm -f "${logfile}" | ||
| exec 2>>"${logfile}" | ||
| set -x | ||
| } | ||
|
|
||
| function cleanup { | ||
| # shellcheck disable=SC2181 | ||
| if [ ! $? = 0 ];then | ||
| echo "Migration run failed: see ${logfile} for details" | ||
| fi | ||
| umount /mnt &>/dev/null | ||
| } | ||
|
|
||
| function get_migration_image { | ||
| # """ | ||
| # Search for migration ISO file | ||
| # """ | ||
| echo /usr/share/migration-image/*-Migration.*.iso | ||
| } | ||
|
|
||
| function get_system_root_device { | ||
| # """ | ||
| # Looking for running system root device | ||
| # """ | ||
| lsblk -p -n -r -o NAME,MOUNTPOINT | grep -E "/$" | uniq | cut -f1 -d" " | ||
| } | ||
|
|
||
| function get_boot_options { | ||
| # """ | ||
| # Create boot options list for kexec | ||
| # """ | ||
| local boot_options | ||
| boot_options="iso-scan/filename=$1 root=live:CDLABEL=CDROM rd.live.image" | ||
| if mdadm --detail "$(get_system_root_device)" &>/dev/null; then | ||
| boot_options="${boot_options} rd.auto" | ||
| fi | ||
| echo "${boot_options}" | ||
| } | ||
|
|
||
| function extract_kernel_and_initrd { | ||
| # """ | ||
| # Extract kernel and initrd for kexec load operation | ||
| # | ||
| # The method assumes EFI layout of the live image | ||
| # """ | ||
| local migration_image=$1 | ||
| local boot_data_dir | ||
| if mount -o ro "${migration_image}" /mnt; then | ||
| boot_data_dir=$(mktemp -d -t migration_XXXX) | ||
| if \ | ||
| cp /mnt/boot/*/loader/initrd /mnt/boot/*/loader/linux \ | ||
| "${boot_data_dir}" | ||
| then | ||
| umount /mnt &>/dev/null | ||
| echo "${boot_data_dir}" | ||
| fi | ||
| fi | ||
| } | ||
|
|
||
| # Check on permissions | ||
| if (( EUID != 0 )); then | ||
| echo "Migration startup requires root permissions" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Set signal handler on EXIT | ||
| trap cleanup EXIT | ||
|
|
||
| # Setup logging | ||
| setup_logging | ||
|
|
||
| # Lookup installed migration ISO image | ||
| migration_iso=$(get_migration_image) | ||
| if [ ! -e "${migration_iso}" ];then | ||
| echo "Migration image ISO file not found: ${migration_iso}" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Extract kexec boot data from migration ISO image | ||
| boot_dir=$(extract_kernel_and_initrd "${migration_iso}") | ||
| if [ ! -e "${boot_dir}" ];then | ||
| echo "Failed to extract boot files" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Run Migration | ||
| kexec \ | ||
| --load "${boot_dir}/linux" \ | ||
| --initrd "${boot_dir}/initrd" \ | ||
| --command-line "$(get_boot_options "${migration_iso}")" | ||
| kexec --exec |
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