kexec-tools/kdump-lib-initramfs.sh

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#!/bin/sh
#
# The code in this file will be used in initramfs environment, bash may
# not be the default shell. Any code added must be POSIX compliant.
DEFAULT_PATH="/var/crash/"
KDUMP_CONFIG_FILE="/etc/kdump.conf"
FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
LVM_CONF="/etc/lvm/lvm.conf"
# Read kdump config in well formated style
kdump_read_conf()
{
# Following steps are applied in order: strip trailing comment, strip trailing space,
# strip heading space, match non-empty line, remove duplicated spaces between conf name and value
[ -f "$KDUMP_CONFIG_FILE" ] && sed -n -e "s/#.*//;s/\s*$//;s/^\s*//;s/\(\S\+\)\s*\(.*\)/\1 \2/p" $KDUMP_CONFIG_FILE
}
# Retrieves config value defined in kdump.conf
# $1: config name, sed regexp compatible
kdump_get_conf_val()
{
# For lines matching "^\s*$1\s+", remove matched part (config name including space),
# remove tailing comment, space, then store in hold space. Print out the hold buffer on last line.
[ -f "$KDUMP_CONFIG_FILE" ] &&
sed -n -e "/^\s*\($1\)\s\+/{s/^\s*\($1\)\s\+//;s/#.*//;s/\s*$//;h};\${x;p}" $KDUMP_CONFIG_FILE
}
is_mounted()
{
findmnt -k -n "$1" > /dev/null 2>&1
}
# $1: info type
# $2: mount source type
# $3: mount source
# $4: extra args
get_mount_info()
{
__kdump_mnt=$(findmnt -k -n -r -o "$1" "--$2" "$3" $4)
[ -z "$__kdump_mnt" ] && [ -e "/etc/fstab" ] && __kdump_mnt=$(findmnt -s -n -r -o "$1" "--$2" "$3" $4)
echo "$__kdump_mnt"
}
is_ipv6_address()
{
echo "$1" | grep -q ":"
}
is_fs_type_nfs()
{
[ "$1" = "nfs" ] || [ "$1" = "nfs4" ]
}
is_fs_type_virtiofs()
{
[ "$1" = "virtiofs" ]
}
# If $1 contains dracut_args "--mount", return <filesystem type>
get_dracut_args_fstype()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f3
}
# If $1 contains dracut_args "--mount", return <device>
get_dracut_args_target()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f1
}
get_save_path()
{
__kdump_path=$(kdump_get_conf_val path)
[ -z "$__kdump_path" ] && __kdump_path=$DEFAULT_PATH
# strip the duplicated "/"
echo "$__kdump_path" | tr -s /
}
get_root_fs_device()
{
findmnt -k -f -n -o SOURCE /
}
# Return the current underlying device of a path, ignore bind mounts
get_target_from_path()
{
__kdump_target=$(df "$1" 2> /dev/null | tail -1 | awk '{print $1}')
[ "$__kdump_target" = "/dev/root" ] && [ ! -e /dev/root ] && __kdump_target=$(get_root_fs_device)
echo "$__kdump_target"
}
get_fs_type_from_target()
{
get_mount_info FSTYPE source "$1" -f
}
get_mntpoint_from_target()
{
# --source is applied to ensure non-bind mount is returned
get_mount_info TARGET source "$1" -f
}
is_ssh_dump_target()
{
kdump_get_conf_val ssh | grep -q @
}
is_raw_dump_target()
{
[ -n "$(kdump_get_conf_val raw)" ]
}
is_virtiofs_dump_target()
{
if [ -n "$(kdump_get_conf_val virtiofs)" ]; then
return 0
fi
if is_fs_type_virtiofs "$(get_dracut_args_fstype "$(kdump_get_conf_val dracut_args)")"; then
return 0
fi
if is_fs_type_virtiofs "$(get_fs_type_from_target "$(get_target_from_path "$(get_save_path)")")"; then
return 0
fi
return 1
}
is_nfs_dump_target()
{
if [ -n "$(kdump_get_conf_val nfs)" ]; then
return 0
fi
if is_fs_type_nfs "$(get_dracut_args_fstype "$(kdump_get_conf_val dracut_args)")"; then
return 0
fi
if is_fs_type_nfs "$(get_fs_type_from_target "$(get_target_from_path "$(get_save_path)")")"; then
return 0
fi
return 1
}
is_fs_dump_target()
{
[ -n "$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|virtiofs")" ]
}
is_lvm2_thinp_device()
{
_device_path=$1
_lvm2_thin_device=$(lvm lvs -S 'lv_layout=sparse && lv_layout=thin' \
--nosuffix --noheadings -o vg_name,lv_name "$_device_path" 2> /dev/null)
[ -n "$_lvm2_thin_device" ]
}
Address the cases where a NIC has a different name in kdump kernel Resolves: bz2076416 Upstream: Fedora Conflict: None commit 568623e69a32266a3b00225b9de6a93435c44474 Author: Coiby Xu <coxu@redhat.com> Date: Thu Sep 23 14:25:01 2021 +0800 Address the cases where a NIC has a different name in kdump kernel A NIC may get a different name in the kdump kernel from 1st kernel in cases like, - kernel assigned network interface names are not persistent e.g. [1] - there is an udev rule to rename the NIC in the 1st kernel but the kdump initrd may not have that rule e.g. [2] If NM tries to match a NIC with a connection profile based on NIC name i.e. connection.interface-name, it will fail the above bases. A simple solution is to ask NM to match a connection profile by MAC address. Note we don't need to do this for user-created NICs like vlan, bridge and bond. An remaining issue is passing the name of a NIC via the kdumpnic dracut command line parameter which requires passing ifname=<interface>:<MAC> to have fixed NIC name. But we can simply drop this requirement. kdumpnic is needed because kdump needs to get the IP by NIC name and use the IP to created a dumping folder named "{IP}-{DATE}". We can simply pass the IP to the kdump kernel directly via a new dracut command line parameter kdumpip instead. In addition to the benefit of simplifying the code, there are other three benefits brought by this approach, - make use of whatever network to transfer the vmcore. Because as long as we have the network to we don't care which NIC is active. - if obtained IP in the kdump kernel is different from the one in the 1st kernel. "{IP}-{DATE}" would better tell where the dumped vmcore comes from. - without passing ifname=<interface>:<MAC> to kdump initrd, the issue of there are two interfaces with the same MAC address for Azure Hyper-V NIC SR-IOV [3] is resolved automatically. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1121778 [2] https://bugzilla.redhat.com/show_bug.cgi?id=810107 [3] https://bugzilla.redhat.com/show_bug.cgi?id=1962421 Signed-off-by: Coiby Xu <coxu@redhat.com> Reviewed-by: Thomas Haller <thaller@redhat.com> Reviewed-by: Philipp Rudo <prudo@redhat.com> Signed-off-by: Coiby Xu <coxu@redhat.com>
2022-11-23 01:42:18 +00:00
kdump_get_ip_route()
{
if ! _route=$(/sbin/ip -o route get to "$1" 2>&1); then
exit 1
fi
echo "$_route"
}
kdump_get_ip_route_field()
{
echo "$1" | sed -n -e "s/^.*\<$2\>\s\+\(\S\+\).*$/\1/p"
}