From: Jiri Benc <jbenc@redhat.com>
Subject: Build correctly with z-stream kernels

In brew, there's usually a newer kernel installed than the one used for
installation. Handle this situation correctly by allowing the spec file to
define kernel_version to be used in rpm dependencies, while building against
a compatible newer (z-stream) kernel.

Signed-off-by: Jiri Benc <jbenc@redhat.com>

---
 kmodtool |   31 ++++++++++++++++++++++++++++---
 macros   |    2 +-
 2 files changed, 29 insertions(+), 4 deletions(-)

--- a/kmodtool
+++ b/kmodtool
@@ -9,6 +9,7 @@
 # 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
@@ -49,9 +50,25 @@ 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 "$verrel"
+}
+
 get_verrel ()
 {
-  verrel=${1:-$(uname -r)}
+  verrel=$(get_kernel_release "$1")
   verrel=${verrel/%.$knownvariants/}
 }
 
@@ -61,10 +78,16 @@ print_verrel ()
   echo "${verrel}"
 }
 
+get_verrel_for_deps ()
+{
+  verrel_dep=${1:-$(uname -r)}
+  verrel_dep=${verrel_dep/%.$knownvariants/}
+}
+
 get_variant ()
 {
   get_verrel $@
-  variant=${1:-$(uname -r)}
+  variant=$(get_kernel_release "$1")
   variant=${variant/#$verrel?(.)/}
   variant=${variant:-'""'}
 }
@@ -129,7 +152,7 @@ get_rpmtemplate ()
     echo "%global _use_internal_dependency_generator 0"
 
     cat <<EOF
-Provides:         kernel-modules >= ${verrel}${dotvariant}
+Provides:         kernel-modules >= ${verrel_dep}${dotvariant}
 Provides:         ${kmod_name}-kmod = %{?epoch:%{epoch}:}%{version}-%{release}
 Requires(post):   /sbin/depmod
 Requires(postun): /sbin/depmod
@@ -206,6 +229,8 @@ print_rpmtemplate ()
   shift
   kver="${1}"
   get_verrel "${1}"
+  get_verrel_for_deps "${1}"
+  [[ -z $kver ]] && kver=$verrel
   shift
   if [ -z "${kmod_name}" ] ; then
     echo "Please provide the kmodule-name as first parameter." >&2
--- a/macros
+++ b/macros
@@ -218,7 +218,7 @@ package or when debugging this package.\
 	then \
 		nobuildreqs="yes" \
 	fi \
-	override_filelist="$filelist" override_preamble="$preamble" nobuildreqs="$nobuildreqs" kmod_version=%kmod_version kmod_release=%kmod_release %{kmodtool} rpmtemplate %{-n*}%{!-n:%name} %{kverrel} $flavors_to_build 2>/dev/null \
+	override_filelist="$filelist" override_preamble="$preamble" nobuildreqs="$nobuildreqs" kmod_version=%kmod_version kmod_release=%kmod_release %{kmodtool} rpmtemplate %{-n*}%{!-n:%name} %{kernel_version} $flavors_to_build 2>/dev/null \
 )}
 
 #==============================================================================