kexec-tools/kdump-lib.sh
Pingfan Liu 14ec322b4b kdump-lib.sh: fix incorrect usage with pipe as input for grep -q in is_pcs_fence_kdump()
For -q option, as man grep says:  Exit immediately with zero status if
any match is found, even if an error was detected.
So when matching, the read side of pipe is closed by "grep -q", while
the write side still try to write more data, which cause SIGPIPE to the
process, and the shell can not exit with 0. It depends on the kernel's
implementation of pipe to decide how much data written by the producer
can trigger the bug.

Bash test script:
  #!/bin/sh
  set -o pipefail
  dd if=/dev/zero of=text.file bs=1M count=1
  sed -i '1s/^/keyword /' text.file
  cat text.file | grep -q keyword
  echo $?

Notice the "set -o pipefail" is set by dracut, so
mkdumprd -> dracut -> dracut-module-setup.sh -> is_pcs_fence_kdump()
trigger the bug.

Signed-off-by: Pingfan Liu <piliu@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Pratyush Anand <panand@redhat.com>
2017-03-08 13:07:20 +08:00

409 lines
9.6 KiB
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#!/bin/sh
#
# Kdump common variables and functions
#
DEFAULT_PATH="/var/crash/"
FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
perror_exit() {
echo $@ >&2
exit 1
}
perror() {
echo $@ >&2
}
is_ssh_dump_target()
{
grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf
}
is_nfs_dump_target()
{
grep -q "^nfs" /etc/kdump.conf || \
[[ $(get_dracut_args_fstype "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)") = nfs* ]]
}
is_raw_dump_target()
{
grep -q "^raw" /etc/kdump.conf
}
is_fs_type_nfs()
{
local _fstype=$1
[ $_fstype = "nfs" ] || [ $_fstype = "nfs4" ] && return 0
return 1
}
is_fs_dump_target()
{
egrep -q "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf
}
is_user_configured_dump_target()
{
return $(is_mount_in_dracut_args || is_ssh_dump_target || is_nfs_dump_target || \
is_raw_dump_target || is_fs_dump_target)
}
strip_comments()
{
echo $@ | sed -e 's/\(.*\)#.*/\1/'
}
# Check if fence kdump is configured in Pacemaker cluster
is_pcs_fence_kdump()
{
# no pcs or fence_kdump_send executables installed?
type -P pcs > /dev/null || return 1
[ -x $FENCE_KDUMP_SEND ] || return 1
# fence kdump not configured?
(pcs cluster cib | grep 'type="fence_kdump"') &> /dev/null || return 1
}
# Check if fence_kdump is configured using kdump options
is_generic_fence_kdump()
{
[ -x $FENCE_KDUMP_SEND ] || return 1
grep -q "^fence_kdump_nodes" /etc/kdump.conf
}
to_dev_name() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $dev
}
get_user_configured_dump_disk()
{
local _target
if is_ssh_dump_target || is_nfs_dump_target; then
return
fi
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw" /etc/kdump.conf 2>/dev/null |awk '{print $2}')
[ -n "$_target" ] && echo $_target
return
}
get_root_fs_device()
{
local _target
_target=$(findmnt -k -f -n -o SOURCE /)
[ -n "$_target" ] && echo $_target
return
}
# findmnt uses the option "-v, --nofsroot" to exclusive the [/dir]
# in the SOURCE column for bind-mounts, then if $_mntpoint equals to
# $_mntpoint_nofsroot, the mountpoint is not bind mounted directory.
is_bind_mount()
{
local _mntpoint=$(findmnt $1 | tail -n 1 | awk '{print $2}')
local _mntpoint_nofsroot=$(findmnt -v $1 | tail -n 1 | awk '{print $2}')
if [[ $_mntpoint = $_mntpoint_nofsroot ]]; then
return 1
else
return 0
fi
}
# Below is just an example for mount info
# /dev/mapper/atomicos-root[/ostree/deploy/rhel-atomic-host/var], if the
# directory is bind mounted. The former part represents the device path, rest
# part is the bind mounted directory which quotes by bracket "[]".
get_bind_mount_directory()
{
local _mntpoint=$(findmnt $1 | tail -n 1 | awk '{print $2}')
local _mntpoint_nofsroot=$(findmnt -v $1 | tail -n 1 | awk '{print $2}')
_mntpoint=${_mntpoint#*$_mntpoint_nofsroot}
_mntpoint=${_mntpoint#[}
_mntpoint=${_mntpoint%]}
echo $_mntpoint
}
get_mntpoint_from_path()
{
echo $(df $1 | tail -1 | awk '{print $NF}')
}
get_target_from_path()
{
local _target
_target=$(df $1 2>/dev/null | tail -1 | awk '{print $1}')
[[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
echo $_target
}
get_fs_type_from_target()
{
echo $(findmnt -k -f -n -r -o FSTYPE $1)
}
# input: device path
# output: the general mount point
# find the general mount point, not the bind mounted point in atomic
# As general system, Use the previous code
#
# ERROR and EXIT:
# the device can be umounted the general mount point, if one of the mount point is bind mounted
# For example:
# mount /dev/sda /mnt/
# mount -o bind /mnt/var /var
# umount /mnt
get_mntpoint_from_target()
{
if is_atomic; then
for _mnt in $(findmnt -k -n -r -o TARGET $1)
do
if ! is_bind_mount $_mnt; then
echo $_mnt
return
fi
done
echo "Mount $1 firstly, without the bind mode" >&2
exit 1
else
echo $(findmnt -k -f -n -r -o TARGET $1)
fi
}
# get_option_value <option_name>
# retrieves value of option defined in kdump.conf
get_option_value() {
echo $(strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\ -f2-`)
}
#This function compose a absolute path with the mount
#point and the relative $SAVE_PATH.
#target is passed in as argument, could be UUID, LABEL,
#block device or even nfs server export of the form of
#"my.server.com:/tmp/export"?
#And possibly this could be used for both default case
#as well as when dump taret is specified. When dump
#target is not specified, then $target would be null.
make_absolute_save_path()
{
local _target=$1
local _mnt
[ -n $_target ] && _mnt=$(get_mntpoint_from_target $1)
_mnt="${_mnt}/$SAVE_PATH"
# strip the duplicated "/"
echo "$_mnt" | tr -s /
}
check_save_path_fs()
{
local _path=$1
if [ ! -d $_path ]; then
perror_exit "Dump path $_path does not exist."
fi
}
is_atomic()
{
grep -q "ostree" /proc/cmdline
}
is_ipv6_address()
{
echo $1 | grep -q ":"
}
# get ip address or hostname from nfs/ssh config value
get_remote_host()
{
local _config_val=$1
# ipv6 address in kdump.conf is around with "[]",
# factor out the ipv6 address
_config_val=${_config_val#*@}
_config_val=${_config_val%:/*}
_config_val=${_config_val#[}
_config_val=${_config_val%]}
echo $_config_val
}
is_hostname()
{
local _hostname=`echo $1 | grep ":"`
if [ -n "$_hostname" ]; then
return 1
fi
echo $1 | grep -q "[a-zA-Z]"
}
# Copied from "/etc/sysconfig/network-scripts/network-functions"
get_hwaddr()
{
if [ -f "/sys/class/net/${1}/address" ]; then
awk '{ print toupper($0) }' < /sys/class/net/${1}/address
elif [ -d "/sys/class/net/${1}" ]; then
LC_ALL= LANG= ip -o link show ${1} 2>/dev/null | \
awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,
"\\1", 1)); }'
fi
}
get_ifcfg_by_device()
{
grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_hwaddr()
{
grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_uuid()
{
grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_name()
{
grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
is_nm_running()
{
[ "$(LANG=C nmcli -t --fields running general status 2>/dev/null)" = "running" ]
}
is_nm_handling()
{
LANG=C nmcli -t --fields device,state dev status 2>/dev/null \
| grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$"
}
# $1: netdev name
get_ifcfg_nmcli()
{
local nm_uuid nm_name
local ifcfg_file
# Get the active nmcli config name of $1
if is_nm_running && is_nm_handling "${1}" ; then
# The configuration "uuid" and "name" generated by nm is wrote to
# the ifcfg file as "UUID=<nm_uuid>" and "NAME=<nm_name>".
nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2>/dev/null \
| grep "${1}" | head -1 | cut -d':' -f1)
nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2>/dev/null \
| grep "${1}" | head -1 | cut -d':' -f1)
ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}")
[ -z "${ifcfg_file}" ] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}")
fi
echo -n "${ifcfg_file}"
}
# $1: netdev name
get_ifcfg_legacy()
{
local ifcfg_file
ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
ifcfg_file=$(get_ifcfg_by_name "${1}")
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
local hwaddr=$(get_hwaddr "${1}")
if [ -n "$hwaddr" ]; then
ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}")
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
fi
ifcfg_file=$(get_ifcfg_by_device "${1}")
echo -n "${ifcfg_file}"
}
# $1: netdev name
# Return the ifcfg file whole name(including the path) of $1 if any.
get_ifcfg_filename() {
local ifcfg_file
ifcfg_file=$(get_ifcfg_nmcli "${1}")
if [ -z "${ifcfg_file}" ]; then
ifcfg_file=$(get_ifcfg_legacy "${1}")
fi
echo -n "${ifcfg_file}"
}
# returns 0 when omission of watchdog module is desired in dracut_args
# returns 1 otherwise
is_wdt_mod_omitted() {
local dracut_args
local ret=1
dracut_args=$(grep "^dracut_args" /etc/kdump.conf)
[[ -z $dracut_args ]] && return $ret
eval set -- $dracut_args
while :; do
[[ -z $1 ]] && break
case $1 in
-o|--omit)
echo $2 | grep -qw "watchdog"
[[ $? == 0 ]] && ret=0
break
esac
shift
done
return $ret
}
# If "dracut_args" contains "--mount" information, use it
# directly without any check(users are expected to ensure
# its correctness).
is_mount_in_dracut_args()
{
grep -q "^dracut_args .*\-\-mount" /etc/kdump.conf
}
# 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
}