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pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
#!/usr/bin/env bash

get_kernel_version() {
  r="$(uname -r | cut -f 1 -d '-')"

  read -r -a p <<< "$(echo "${r}" | tr '.' ' ')"

  printf "%03d%03d%03d" "${p[0]}" "${p[1]}" "${p[2]}"
}

get_rh_version() {
  if [ ! -f /etc/redhat-release ]; then
    printf "000000000"
    return
  fi

  r="$(cut -f 4 -d ' ' < /etc/redhat-release)"

  read -r -a p <<< "$(echo "${r}" | tr '.' ' ')"

  printf "%03d%03d%03d" "${p[0]}" "${p[1]}" "${p[2]}"
}

if [ "$(uname -s)" != "Linux" ]; then
  echo >&2 "This does not appear to be a Linux system."
  exit 1
fi

KERNEL_VERSION="$(uname -r)"

if [ "$(get_kernel_version)" -lt 004014000 ] && [ "$(get_rh_version)" -lt 0070061810 ]; then
  echo >&2 "WARNING: Your kernel appears to be older than 4.11 or you are using RH version older than 7.6.1810. This may still work in some cases, but probably won't."
fi

CONFIG_PATH=""
MODULE_LOADED=""

if modprobe configs 2> /dev/null; then
  MODULE_LOADED=1
fi

if [ -r /proc/config.gz ]; then
  CONFIG_PATH="/proc/config.gz"
elif [ -r "/lib/modules/${KERNEL_VERSION}/source/.config" ]; then
  CONFIG_PATH="/lib/modules/${KERNEL_VERSION}/source/.config"
elif [ -r "/lib/modules/${KERNEL_VERSION}.x86_64/source/.config" ]; then
  CONFIG_PATH="/lib/modules/${KERNEL_VERSION}.x86_64/source/.config"
elif [ -n "$(find /boot -name "config-${KERNEL_VERSION}*")" ]; then
  CONFIG_PATH="$(find /boot -name "config-${KERNEL_VERSION}*" | head -n 1)"
fi

if [ -n "${CONFIG_PATH}" ]; then
  GREP='grep'
  CAT='cat'

  if echo "${CONFIG_PATH}" | grep -q '.gz'; then
    CAT='zcat'
  fi

  REQUIRED_CONFIG="KPROBES KPROBES_ON_FTRACE HAVE_KPROBES BPF BPF_SYSCALL BPF_JIT"

  for required_config in ${REQUIRED_CONFIG}; do
    # Fix issue https://github.com/netdata/netdata/issues/14668
    # if ! "${GREP}" -q "CONFIG_${required_config}=y" "${CONFIG_PATH}"; then
    if ! { "${CAT}" "${CONFIG_PATH}" | "${GREP}" -q "CONFIG_${required_config}=y" >&2 >/dev/null; } ;then
      echo >&2 " Missing Kernel Config: ${required_config}"
      exit 1
    fi
  done
fi

if [ -n "${MODULE_LOADED}" ]; then
  modprobe -r configs 2> /dev/null || true # Ignore failures from CONFIGS being builtin
fi

exit 0