#!/bin/bash

# kmodtool - Helper script for building kernel module RPMs
# Copyright (c) 2003-2012 Ville Skyttä <ville.skytta@iki.fi>,
#                         Thorsten Leemhuis <fedora@leemhuis.info>
# Copyright (c) 2012-2018 Nicolas Chauvet <kwizart@gmail.com>
# Copyright (c) 2017 Nicolas Vieville <nicolas.vieville@univ-valenciennes.fr>
#
# 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.

shopt -s extglob

myprog="kmodtool-${repo}"
myver="0.12.1"

kmodname=
build_kernels="current"
kernels_known_variants=
kernel_versions=
kernel_versions_to_build_for=
prefix=
filterfile=
target=

error_out()
{
	local errorlevel=${1}
	shift
	echo "Error: $@" >&2
	# the next line is not multi-line safe -- not needed *yet*
	echo "%global kmodtool_check echo \"kmodtool error: $@\"; exit ${errorlevel};"
	exit ${errorlevel}
}

print_rpmtemplate_header()
{
	echo
	echo '%global kmodinstdir_prefix  '${usr_lib_modules}/
	echo '%global kmodinstdir_postfix '/extra/${kmodname}/
	echo '%global kernel_versions     '${kernel_versions}
	echo '%global debug_package %{nil}'
	echo
}

print_akmodtemplate ()
{
	echo
	cat <<EOF

%global akmod_install mkdir -p \$RPM_BUILD_ROOT/%{_usrsrc}/akmods/; \\\
rpmbuild --define "_sourcedir %{_sourcedir}" \\\
--define "_srcrpmdir \$RPM_BUILD_ROOT/%{_usrsrc}/akmods/" \\\
-bs --nodeps %{_specdir}/%{name}.spec ; \\\
ln -s \$(ls \$RPM_BUILD_ROOT/%{_usrsrc}/akmods/) \$RPM_BUILD_ROOT/%{_usrsrc}/akmods/${kmodname}-kmod.latest

%package       -n akmod-${kmodname}
Summary:          Akmod package for ${kmodname} kernel module(s)
Requires:         kmodtool
Requires:         akmods
%{?AkmodsBuildRequires:Requires: %{AkmodsBuildRequires}}
# same requires and provides as a kmods package would have
Requires:         ${kmodname}-kmod-common >= %{?epoch:%{epoch}:}%{version}
Provides:         ${kmodname}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
EOF

	if [[ ${obsolete_name} ]] ; then
		echo "Provides:         akmod-${obsolete_name} = ${obsolete_version}"
		echo "Obsoletes:        akmod-${obsolete_name} < ${obsolete_version}"
	fi

	cat <<EOF

%description   -n akmod-${kmodname}
This package provides the akmod package for the ${kmodname} kernel modules.

%posttrans     -n akmod-${kmodname}
nohup /usr/sbin/akmods --from-akmod-posttrans --akmod ${kmodname} &> /dev/null &

%files         -n akmod-${kmodname}
%defattr(-,root,root,-)
%{_usrsrc}/akmods/*
EOF
}

print_akmodmeta ()
{
	cat <<EOF

%package       -n kmod-${kmodname}
Summary:          Metapackage which tracks in ${kmodname} kernel module for newest kernel${dashvariant}

Provides:         ${kmodname}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
Provides:         kmod-${kmodname}-xen = %{?epoch:%{epoch}:}%{version}-%{release}
Provides:         kmod-${kmodname}-smp = %{?epoch:%{epoch}:}%{version}-%{release}
Provides:         kmod-${kmodname}-PAE = %{?epoch:%{epoch}:}%{version}-%{release}
Requires:         akmod-${kmodname} = %{?epoch:%{epoch}:}%{version}-%{release}
EOF

	if [[ ${obsolete_name} ]] ; then
		echo "Provides:         kmod-${obsolete_name} = ${obsolete_version}"
		echo "Obsoletes:        kmod-${obsolete_name} < ${obsolete_version}"
	fi
	cat <<EOF

%description   -n kmod-${kmodname}${dashvariant}
This is a meta-package without payload which sole purpose is to require the
${kmodname} kernel module(s) for the newest kernel${dashvariant},
to make sure you get it together with a new kernel.

%files         -n kmod-${kmodname}${dashvariant}
%defattr(644,root,root,755)
EOF
}

print_rpmtemplate_per_kmodpkg ()
{
	if [[ "${1}" == "--custom" ]] ; then
		shift
		local customkernel=true
	elif [[ "${1}" == "--redhat" ]] ; then
		# this is needed for akmods
		shift
		local redhatkernel=true
	fi

	## Build some interesting strings with kernel uname -r
	## Examples:
	## kernel_uname_r                3.10.0-693.2.2.el7.x86_64
	## kernel_uname_r_wo_arch        3.10.0-693.2.2.el7
	## kernel_uname_r_short          3.10.0-693.el7
	## kernel_uname_r_rel            693
	## kernel_uname_r_rel_plus_one   694
	## kernel_uname_r_short_plus_one 3.10.0-694.el7
	local kernel_uname_r=${1}
	local kernel_uname_r_wo_arch=$(echo ${1} | sed -e "s/\.${target}//")
	local kernel_uname_r_short=$(echo ${1} | sed -e "s/\.${target}//" -e "s/\(.*-\)\([[:alnum:]]*\)\(\..*\)\(\.el.*\)/\1\2\4/")
	local kernel_uname_r_rel=$(echo ${1} | sed -e "s/.*-//" -e "s/\..*//")
	local kernel_uname_r_rel_plus_one=$(( kernel_uname_r_rel+1 ))
	local kernel_uname_r_short_plus_one=$(echo ${kernel_uname_r_short} | sed -e "s/(//" -e "s/-${kernel_uname_r_rel}\./-${kernel_uname_r_rel_plus_one}\./")
	local kernel_variant="${2:+-${2}}"

	if [[ -h /sbin ]] ; then
		echo '%global  _prefix_usr      '/usr
	fi

    # first part
	cat <<EOF

%if 0%{?rhel}
%package       -n kmod-${kmodname}
Summary:          ${kmodname} kernel module(s) for ${kernel_uname_r_short}
Provides:         kernel-modules = ${kernel_uname_r}
Provides:         ${kmodname}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
Requires:         ${kmodname}-kmod-common >= %{?epoch:%{epoch}:}%{version}
Requires(post):   %{?_prefix_usr}/sbin/weak-modules
Requires(post):   %{?_prefix_usr}/sbin/depmod
Requires(postun): %{?_prefix_usr}/sbin/weak-modules
Requires(postun): %{?_prefix_usr}/sbin/depmod
%else
%package       -n kmod-${kmodname}-${kernel_uname_r}
Summary:          ${kmodname} kernel module(s) for ${kernel_uname_r}
Provides:         kernel-modules-for-kernel = ${kernel_uname_r}
Provides:         ${kmodname}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
Requires:         ${kmodname}-kmod-common >= %{?epoch:%{epoch}:}%{version}
Requires(post):   %{?_prefix_usr}/sbin/depmod
Requires(postun): %{?_prefix_usr}/sbin/depmod
%endif
EOF

	if [[ ${obsolete_name} ]] ; then
		echo
		echo "Provides:         kmod-${obsolete_name}-${kernel_uname_r} = ${obsolete_version}"
		echo "Obsoletes:        kmod-${obsolete_name}-${kernel_uname_r} < ${obsolete_version}"
	fi

	# second part
	if [[ ! "${customkernel}" ]] ; then
		cat <<EOF

%if 0%{?rhel}
Requires:         kernel >= ${kernel_uname_r_short}
Requires:         kernel < ${kernel_uname_r_short_plus_one}
BuildRequires:    kernel-devel = ${kernel_uname_r_wo_arch} redhat-rpm-config kernel-abi-whitelists

%post          -n kmod-${kmodname}
%{?_prefix_usr}/sbin/depmod -aeF /boot/System.map-${kernel_uname_r} ${kernel_uname_r} > /dev/null || :

modules=( \$(find ${usr_lib_modules}/${kernel_uname_r}/extra/${kmodname}/ | grep -e '\.ko$') )
printf '%s\n' "\${modules[@]}" | %{?_prefix_usr}/sbin/weak-modules --add-modules

%preun         -n kmod-${kmodname}
rpm -ql kmod-${kmodname}-%{version}-%{release}.$(arch) | grep -e '\.ko$' > /var/run/rpm-kmod-${kmodname}-modules

%postun        -n kmod-${kmodname}
%{?_prefix_usr}/sbin/depmod -aeF /boot/System.map-${kernel_uname_r} ${kernel_uname_r} &> /dev/null || :

modules=( \$(cat /var/run/rpm-kmod-${kmodname}-modules) )
rm /var/run/rpm-kmod-${kmodname}-modules
printf '%s\n' "\${modules[@]}" | %{?_prefix_usr}/sbin/weak-modules --remove-modules
%else
Requires:         kernel-uname-r = ${kernel_uname_r}
BuildRequires:    kernel-devel-uname-r = ${kernel_uname_r}
%post          -n kmod-${kmodname}-${kernel_uname_r}
%{?_prefix_usr}/sbin/depmod -aeF /boot/System.map-${kernel_uname_r} ${kernel_uname_r} > /dev/null || :
%postun        -n kmod-${kmodname}-${kernel_uname_r}
%{?_prefix_usr}/sbin/depmod -aeF /boot/System.map-${kernel_uname_r} ${kernel_uname_r} &> /dev/null || :
%endif
EOF
	else
		cat <<EOF

%if 0%{?rhel}
%post          -n kmod-${kmodname}
[[ "\$(uname -r)" == "${kernel_uname_r}"  ]] && %{?_prefix_usr}/sbin/depmod -a > /dev/null || :

if [[ "\$(uname -r)" == "${kernel_uname_r}"  ]] ; then
  modules=( \$(find ${usr_lib_modules}/${kernel_uname_r}/extra/${kmodname}/ | grep -e '\.ko$') )
  printf '%s\n' "\${modules[@]}" | %{?_prefix_usr}/sbin/weak-modules --add-modules
fi

%preun         -n kmod-${kmodname}
if [[ "\$(uname -r)" == "${kernel_uname_r}"  ]] ; then
  rpm -ql kmod-${kmodname}-%{version}-%{release}.$(arch) | grep -e '\.ko$' > /var/run/rpm-kmod-${kmodname}-modules
fi

%postun        -n kmod-${kmodname}
[[ "\$(uname -r)" == "${kernel_uname_r}"  ]] && %{?_prefix_usr}/sbin/depmod -a > /dev/null || :

if [[ "\$(uname -r)" == "${kernel_uname_r}"  ]] ; then
  modules=( \$(cat /var/run/rpm-kmod-${kmodname}-modules) )
  rm /var/run/rpm-kmod-${kmodname}-modules
  printf '%s\n' "\${modules[@]}" | %{?_prefix_usr}/sbin/weak-modules --remove-modules
fi
%else
%post          -n kmod-${kmodname}-${kernel_uname_r}
[[ "\$(uname -r)" == "${kernel_uname_r}"  ]] && %{?_prefix_usr}/sbin/depmod -a > /dev/null || :
%postun        -n kmod-${kmodname}-${kernel_uname_r}
[[ "\$(uname -r)" == "${kernel_uname_r}"  ]] && %{?_prefix_usr}/sbin/depmod -a > /dev/null || :
%endif
EOF
	fi

	# third part
	cat <<EOF

%if 0%{?rhel}
%description   -n kmod-${kmodname}
This package provides the ${kmodname} kernel modules built for the Linux
kernel ${kernel_uname_r_short} for the %{_target_cpu} family of processors.
%files         -n kmod-${kmodname}
%defattr(644,root,root,755)
%dir ${usr_lib_modules}/${kernel_uname_r}/extra
${usr_lib_modules}/${kernel_uname_r}/extra/${kmodname}/
%else
%description   -n kmod-${kmodname}-${kernel_uname_r}
This package provides the ${kmodname} kernel modules built for the Linux
kernel ${kernel_uname_r} for the %{_target_cpu} family of processors.
%files         -n kmod-${kmodname}-${kernel_uname_r}
%defattr(644,root,root,755)
%dir ${usr_lib_modules}/${kernel_uname_r}/extra
${usr_lib_modules}/${kernel_uname_r}/extra/${kmodname}/
%endif
EOF
}

print_rpmtemplate_kmodmetapkg ()
{
		local kernel_uname_r=${1}
		local kernel_variant="${2:+-${2}}"

		cat <<EOF

%package       -n kmod-${kmodname}${kernel_variant}
Summary:          Metapackage which tracks in ${kmodname} kernel module for newest kernel${kernel_variant}

Provides:         ${kmodname}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
Requires:         kmod-${kmodname}-${kernel_uname_r} >= %{?epoch:%{epoch}:}%{version}-%{release}
EOF

		if [[ ${obsolete_name} ]] ; then
			echo "Provides:         kmod-${obsolete_name}${kernel_variant} = ${obsolete_version}"
			echo "Obsoletes:        kmod-${obsolete_name}${kernel_variant} < ${obsolete_version}"
		fi

		cat <<EOF

%description   -n kmod-${kmodname}${kernel_variant}
This is a meta-package without payload which sole purpose is to require the
${kmodname} kernel module(s) for the newest kernel${kernel_variant}.
to make sure you get it together with a new kernel.

%files         -n kmod-${kmodname}${kernel_variant}
%defattr(644,root,root,755)


EOF
}

print_customrpmtemplate ()
{
	for kernel in ${1}
	do
		if [[ -e "/usr/src/kernels/${kernel}" ]] ; then
			# this looks like a Fedora/RH kernel -- print a normal template (which includes the proper BR) and be happy :)
			kernel_versions="${kernel_versions}${kernel}___%{_usrsrc}/kernels/${kernel} "

			# parse kernel versions string and print template
			local kernel_verrelarch=${kernel%%${kernels_known_variants}}
			print_rpmtemplate_per_kmodpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
		elif [[ -e "${usr_lib_modules}"/"${kernel}"/build/Makefile ]] ; then
			# likely a user-build-kernel with available buildfiles
			# fixme: we should check if uname from Makefile is the same as ${kernel}

			kernel_versions="${kernel_versions}${kernel}___${usr_lib_modules}/${kernel}/build/ "
			print_rpmtemplate_per_kmodpkg --custom "${kernel}"
		else
			error_out 2 "Don't know how to handle ${kernel} -- ${usr_lib_modules}/${kernel}/build/Makefile not found"
		fi
	done

	# well, it's no header anymore, but who cares ;-)
	print_rpmtemplate_header
}


print_rpmtemplate ()
{
	# create kernel_versions var
	for kernel_version in ${kernel_versions_to_build_for}
	do
		kernel_versions="${kernel_versions}${kernel_version}___%{_usrsrc}/kernels/${kernel_version} "
	done

	# and print it and some other required stuff as macro
	print_rpmtemplate_header

	# now print the packages itselfs
	for kernel in ${kernel_versions_to_build_for} ; do

		local kernel_verrelarch=${kernel%%${kernels_known_variants}}

		# create metapackage
		print_rpmtemplate_kmodmetapkg ${kernel} ${kernel##${kernel_verrelarch}}

		# create package
		print_rpmtemplate_per_kmodpkg ${kernel} ${kernel##${kernel_verrelarch}}
	done
}

myprog_help ()
{
	echo "Usage: $(basename ${0}) [OPTIONS]"
	echo $'\n'"Creates a template to be used during kmod building"
	echo $'\n'"Available options:"
	# FIXME echo " --datadir <dir>     -- look for our shared files in <dir>"
	echo " --filterfile <file>  -- filter the results with grep --file <file>"
	echo " --for-kernels <list> -- created templates only for these kernels"
	echo " --kmodname <file>    -- name of the kmod (required)"
	echo " --noakmod            -- no akmod package"
	echo " --repo <name>        -- use buildsys-build-<name>-kerneldevpkgs"
	echo " --target <arch>      -- target-arch (required)"
}

while [ "${1}" ] ; do
	case "${1}" in
		--filterfile)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide path to a filter-file together with --filterfile" >&2
			elif [[ ! -e "${1}" ]] ; then
				error_out 2 "Filterfile ${1} not found" >&2
			fi
			filterfile="${1}"
			shift
			;;
		--kmodname)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide the name of the kmod together with --kmodname" >&2
			fi
			# strip pending -kmod
			kmodname="${1%%-kmod}"
			shift
			;;
		--repo)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide the name of the repo together with --repo" >&2
			fi
			repo=${1}
			shift
			;;
		--for-kernels)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide the name of the kmod together with --kmodname" >&2
			fi
			for_kernels="${1}"
			shift
			;;
		--noakmod)
			shift
			noakmod="true"
			;;
		--obsolete-name)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide the name of the kmod to obsolte together with --obsolete-name" >&2
			fi
			obsolete_name="${1}"
			shift
			;;
		--obsolete-version)
			shift
			if [[ ! "${1}" ]] ; then
				error_out 2 "Please provide the version of the kmod to obsolte together with --obsolete-version" >&2
			fi
			obsolete_version="${1}"
			shift
			;;
		--target)
			shift
			target="${1}"
			shift
			;;
		--akmod)
			shift
			build_kernels="akmod"
			;;
		--newest)
			shift
			build_kernels="newest"
			;;
		--current)
			shift
			build_kernels="current"
			;;
		--help)
			myprog_help
			exit 0
			;;
		--version)
			echo "${myprog} ${myver}"
			exit 0
			;;
		*)
			echo "Error: Unknown option '${1}'." >&2
			usage >&2
			exit 2
			;;
	esac
done

if [[ -h /lib ]] ; then
	usr_lib_modules=/usr/lib/modules
else
	usr_lib_modules=/lib/modules
fi

if [[ -e ./kmodtool-kernel-variants ]] ; then
	kernels_known_variants="$(cat ./kmodtool-kernel-variants)"
elif [[ -e /usr/share/kmodtool/kernel-variants ]] ; then
	kernels_known_variants="$(cat /usr/share/kmodtool/kernel-variants)"
else
	error_out 2  "Could not find /usr/share/kmodtool/kernel-variants"
fi

# general sanity checks
if [[ ! "${target}" ]] ; then
	error_out 2 "please pass target arch with --target"
elif [[ ! "${kmodname}" ]] ; then
	error_out 2 "please pass kmodname with --kmodname"
elif [[ ! "${kernels_known_variants}" ]] ; then
	error_out 2 "could not determine known variants"
elif ( [[ "${obsolete_name}" ]] && [[ ! "${obsolete_version}" ]] ) ||  ( [[ ! "${obsolete_name}" ]] && [[ "${obsolete_version}" ]] ) ; then
	error_out 2 "you need to provide both --obsolete-name and --obsolete-version"
fi

# go
if [[ "${for_kernels}" ]] ; then
	# this is easy:
	print_customrpmtemplate "${for_kernels}"
elif [[ "${build_kernels}" == "akmod" ]] ; then
	# do only a akmod package
	print_akmodtemplate
	print_akmodmeta
else
	# seems we are on out own to decide for which kernels to build

	# we need more sanity checks in this case
	if [[ ! "${repo}" ]] ; then
		error_out 2 "please provide repo name with --repo"
	elif ! $(which buildsys-build-${repo}-kerneldevpkgs &> /dev/null) ; then
		error_out 2 "buildsys-build-${repo}-kerneldevpkgs not found"
	fi

	# call buildsys-build-${repo}-kerneldevpkgs to get the list of kernels
	cmdoptions="--target ${target}"

	# filterfile to filter list of kernels?
	if [[ "${filterfile}" ]] ; then
		cmdoptions="${cmdoptions} --filterfile ${filterfile}"
	fi

	kernel_versions_to_build_for="$(buildsys-build-${repo}-kerneldevpkgs --${build_kernels} ${cmdoptions})"
	returncode=$?
	if (( ${returncode} != 0 )) ; then
		error_out 2 "buildsys-build-${repo}-kerneldevpkgs failed: $(buildsys-build-${repo}-kerneldevpkgs --${build_kernels} ${cmdoptions})"
	fi

	if [[ "${build_kernels}" == "current" ]] && [[ ! "${noakmod}" ]] ; then
		print_akmodtemplate
	fi

	print_rpmtemplate
fi