#!/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"

is_ssh_dump_target()

{

    grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf

}

is_nfs_dump_target()

{

    grep -q "^nfs" /etc/kdump.conf

}

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_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 -q '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

}

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()

{

    echo $(df $1 | tail -1 |  awk '{print $1}')

}

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 /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]"

}