#!/bin/bash

# kmodtool - Helper script for building kernel module RPMs
#            An original version appeared in Fedora. This version is
#            generally called only by the %kernel_module_package RPM macro
#            during the process of building Driver Update Packages (which
#            are also known as "kmods" in the Fedora community).
#
# Copyright (c) 2003-2010 Ville Skyttä <ville.skytta@iki.fi>,
#                         Thorsten Leemhuis <fedora@leemhuis.info>
#                         Jon Masters <jcm@redhat.com>
# Copyright (c) 2012-2013 Jiri Benc <jbenc@redhat.com>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# Changelog:
#
#            2010/07/28 - Add fixes for filelists in line with LF standard
#                       - Remove now defunct "framepointer" kernel variant
#                       - Change version to "rhel6-rh2" as a consequence.
#
#            2010/01/10 - Simplified for RHEL6. We are working on upstream
#                         moving to a newer format and in any case do not
#                         need to retain support for really old systems.

shopt -s extglob

myprog="kmodtool"
myver="0.10.10_kmp2"
knownvariants=@(debug|kdump)
kmod_name=
kver=
verrel=
variant=

get_kernel_release ()
{
  if [[ -z $1 ]]; then
    uname -r
    return
  fi
  local arch=$(arch)
  local verrel=${1%.$arch}
  local verprefix=${verrel%.*}
  local versuffix=${verrel#$verprefix}
  verrel=$(ls -Ud /usr/src/kernels/$verprefix*$versuffix.$arch | sort -V | tail -n 1)
  verrel=${verrel##*/}
  [[ -z $verrel ]] && verrel=$1.$arch
  echo "$verrel"
}

get_verrel ()
{
  verrel=$(get_kernel_release "$1")
  verrel=${verrel/%.$knownvariants/}
}

print_verrel ()
{
  get_verrel $@
  echo "${verrel}"
}

get_verrel_for_deps ()
{
  verrel_dep=${1:-$(uname -r)}
  verrel_dep=${verrel_dep/%.$knownvariants/}
}

get_variant ()
{
  get_verrel $@
  variant=$(get_kernel_release "$1")
  variant=${variant/#$verrel?(.)/}
  variant=${variant:-'""'}
}

print_variant ()
{
  get_variant $@
  echo "${variant}"
}

get_filelist() {
	local IFS=$'\n'
	filelist=($(cat))

	if [ ${#filelist[@]} -gt 0 ];
	then
		for ((n = 0; n < ${#filelist[@]}; n++));
		do
			line="${filelist[n]}"
			line=$(echo "$line" \
				| sed -e "s/%verrel/$verrel/g" \
				| sed -e "s/%variant/$variant/g" \
				| sed -e "s/%dashvariant/$dashvariant/g" \
				| sed -e "s/%dotvariant/$dotvariant/g" \
				| sed -e "s/\.%1/$dotvariant/g" \
				| sed -e "s/\-%1/$dotvariant/g" \
				| sed -e "s/%2/$verrel/g")
			echo "$line"
		done
	else
		echo "%defattr(644,root,root,755)"
		echo "/lib/modules/${verrel}${dotvariant}"
	fi
}

get_rpmtemplate ()
{
    local variant="${1}"
    local dashvariant="${variant:+-${variant}}"
    local dotvariant="${variant:+.${variant}}"

    echo "%package       -n kmod-${kmod_name}${dashvariant}"

    if [ -z "$kmod_provides_summary" ]; then
        echo "Summary:          ${kmod_name} kernel module(s)"
    fi

    if [ -z "$kmod_provides_group" ]; then
        echo "Group:            System Environment/Kernel"
    fi

    if [ ! -z "$kmod_version" ]; then
        echo "Version: %{kmod_version}"
    fi

    if [ ! -z "$kmod_release" ]; then
        echo "Release: %{kmod_release}"
    fi

    # Turn off the internal dep generator so we will use the kmod scripts.
    echo "%global _use_internal_dependency_generator 0"

    cat <<EOF
Provides:         kernel-modules >= ${verrel_dep}${dotvariant}
Provides:         ${kmod_name}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
Requires:         kernel >= 3.10.0-1160.el7
Requires(post):   /usr/sbin/depmod
Requires(postun): /usr/sbin/depmod
EOF

    if [ "yes" != "$nobuildreqs" ]
    then
        echo "BuildRequires: kernel${dashvariant}-devel"
    fi

    if [ "" != "$override_preamble" ]
    then
        cat "$override_preamble"
    fi

cat <<EOF
%description   -n kmod-${kmod_name}${dashvariant}
WireGuard is a novel VPN that runs inside the Linux Kernel and uses
state-of-the-art cryptography (the "Noise" protocol). It aims to be
faster, simpler, leaner, and more useful than IPSec, while avoiding
the massive headache. It intends to be considerably more performant
than OpenVPN. WireGuard is designed as a general purpose VPN for
running on embedded interfaces and super computers alike, fit for
many different circumstances. It runs over UDP.
EOF

##############################################################################
## The following are not part of this script directly, they are scripts     ##
## that will be executed by RPM during various stages of package processing ##
##############################################################################

cat <<EOF
%post          -n kmod-${kmod_name}${dashvariant}
echo "Working. This may take some time ..."
if [ -e "/boot/System.map-${verrel}${dotvariant}" ]; then
    /usr/sbin/depmod -aeF "/boot/System.map-${verrel}${dotvariant}" "${verrel}${dotvariant}" > /dev/null || :
fi
modules=( \$(find /lib/modules/${verrel}${dotvariant}/extra/${kmod_name} | grep '\.ko$') )
if [ -x "/sbin/weak-modules" ]; then
    printf '%s\n' "\${modules[@]}" | /sbin/weak-modules --add-modules
fi
echo "Done."
EOF

cat <<EOF
%preun         -n kmod-${kmod_name}${dashvariant}
rpm -ql kmod-${kmod_name}${dashvariant}-%{version}-%{release}.$(arch) | grep '\.ko$' > /var/run/rpm-kmod-${kmod_name}${dashvariant}-modules
EOF

cat <<EOF
%postun        -n kmod-${kmod_name}${dashvariant}
echo "Working. This may take some time ..."
if [ -e "/boot/System.map-${verrel}${dotvariant}" ]; then
    /usr/sbin/depmod -aeF "/boot/System.map-${verrel}${dotvariant}" "${verrel}${dotvariant}" > /dev/null || :
fi
modules=( \$(cat /var/run/rpm-kmod-${kmod_name}${dashvariant}-modules) )
rm /var/run/rpm-kmod-${kmod_name}${dashvariant}-modules
if [ -x "/sbin/weak-modules" ]; then
    printf '%s\n' "\${modules[@]}" | /sbin/weak-modules --remove-modules
fi
echo "Done."
EOF

echo "%files         -n kmod-${kmod_name}${dashvariant}"
if [ "" == "$override_filelist" ];
then
    echo "%defattr(644,root,root,755)"
    echo "/lib/modules/${verrel}${dotvariant}/"
    echo "%config /etc/depmod.d/kmod-${kmod_name}.conf"
    echo "%doc /usr/share/doc/kmod-${kmod_name}-%{version}/"
else
    cat "$override_filelist" | get_filelist
fi
}

print_rpmtemplate ()
{
  kmod_name="${1}"
  shift
  kver="${1}"
  get_verrel "${1}"
  get_verrel_for_deps "${1}"
  [[ -z $kver ]] && kver=$verrel
  shift
  if [ -z "${kmod_name}" ] ; then
    echo "Please provide the kmodule-name as first parameter." >&2
    exit 2
  elif [ -z "${kver}" ] ; then
    echo "Please provide the kver as second parameter." >&2
    exit 2
  elif [ -z "${verrel}" ] ; then
    echo "Couldn't find out the verrel." >&2
    exit 2
  fi

  for variant in "$@" ; do
      if [ "default" == "$variant" ];
      then
            get_rpmtemplate ""
      else
            get_rpmtemplate "${variant}"
      fi
  done
}

usage ()
{
  cat <<EOF
You called: ${invocation}

Usage: ${myprog} <command> <option>+
 Commands:
  verrel <uname>                               
    - Get "base" version-release.
  variant <uname>                               
    - Get variant from uname.
  rpmtemplate <mainpgkname> <uname> <variants> 
    - Return a template for use in a source RPM
  version  
    - Output version number and exit.
EOF
}

invocation="$(basename ${0}) $@"
while [ "${1}" ] ; do
  case "${1}" in
    verrel)
      shift
      print_verrel $@
      exit $?
      ;;
    variant)
      shift
      print_variant $@
      exit $?
      ;;
    rpmtemplate)
      shift
      print_rpmtemplate "$@"
      exit $?
      ;;
    version)
      echo "${myprog} ${myver}"
      exit 0
      ;;
    *)
      echo "Error: Unknown option '${1}'." >&2
      usage >&2
      exit 2
      ;;
  esac
done

# Local variables:
# mode: sh
# sh-indentation: 2
# indent-tabs-mode: nil
# End:
# ex: ts=2 sw=2 et
