Add RHEL style kmod packages

Provide a Redhat specific zfs-kmod.spec file which uses the old style
kmods (not kmods2) packaging.  By using the provided kmodtool script
packages can be built which support weak modules.  This allows for the
kernel to be updated without having to rebuild the ZFS kernel modules.

Packages for RHEL/Centos/SL/TOSS which use this spec file can by built
as follows:

$ ./configure --with-spec=redhat
$ make rpms

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

config/zfs-build.m4

@@ -151,7 +151,7 @@ AC_DEFUN([ZFS_AC_RPM], [
 	RPM_SPEC_DIR="rpm/generic"
 	AC_ARG_WITH([spec],
 		AS_HELP_STRING([--with-spec=SPEC],
-		[Spec files 'generic']),
+		[Spec files 'generic|redhat']),
 		[RPM_SPEC_DIR="rpm/$withval"])
 
 	AC_MSG_CHECKING([whether spec files are available])

configure.ac

@@ -134,6 +134,10 @@ AC_CONFIG_FILES([
 	scripts/zpool-config/Makefile
 	scripts/common.sh
 	rpm/Makefile
+	rpm/redhat/Makefile
+	rpm/redhat/zfs.spec
+	rpm/redhat/zfs-kmod.spec
+	rpm/redhat/zfs-dkms.spec
 	rpm/generic/Makefile
 	rpm/generic/zfs.spec
 	rpm/generic/zfs-kmod.spec

rpm/Makefile.am

@@ -1 +1 @@
-SUBDIRS = generic
+SUBDIRS = generic redhat

rpm/redhat/.gitignore

@@ -0,0 +1,3 @@
+/zfs-dkms.spec
+/zfs-kmod.spec
+/zfs.spec

rpm/redhat/Makefile.am

@@ -0,0 +1 @@
+EXTRA_DIST = zfs.spec.in zfs-kmod.spec.in zfs-dkms.spec.in

rpm/redhat/zfs-dkms.spec.in

@@ -0,0 +1 @@
+../generic/zfs-dkms.spec.in

rpm/redhat/zfs-kmod.spec.in

@@ -0,0 +1,86 @@
+%bcond_with     debug
+%bcond_with     debug_dmu_tx
+
+Name:           @PACKAGE@-kmod
+Version:        @VERSION@
+Release:        @RELEASE@%{?dist}
+
+Summary:        Kernel module(s)
+Group:          System Environment/Kernel
+License:        @ZFS_META_LICENSE@
+URL:            http://zfsonlinux.org/
+BuildRequires:  %kernel_module_package_buildreqs
+BuildRequires:  kmod-spl-devel = %{version}
+Source0:        @PACKAGE@-%{version}.tar.gz
+BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+
+# Additional dependency information for the kmod sub-package must be specified
+# by generating a preamble text file which kmodtool can append to the spec file.
+%(/bin/echo -e "\
+Requires:       spl-kmod\n\
+Requires:       @PACKAGE@ = %{version}\n\
+Conflicts:      @PACKAGE@-dkms\n\n" > %{_sourcedir}/kmod-preamble)
+
+%description
+This package contains the ZFS kernel modules.
+
+%define kmod_name @PACKAGE@
+%define debug_package %{nil}
+
+%kernel_module_package -n %{kmod_name} -p %{_sourcedir}/kmod-preamble
+
+%define ksrc %{_usrsrc}/kernels/%{kverrel}
+%define kobj %{ksrc}
+%define splsrc %{_usrsrc}/spl-%{version}
+%define splobj %{splsrc}/%{kverrel}
+
+%package -n kmod-%{kmod_name}-devel
+Summary:        ZFS kernel module(s) devel common
+Group:          System Environment/Kernel
+Requires:       kmod-spl-devel = %{version}
+
+%description -n  kmod-%{kmod_name}-devel
+This package provides the header files and objects to build kernel modules
+which depend on the spl kernel module.
+
+%prep
+if ! [ -d "%{ksrc}"  ]; then
+        echo "Kernel build directory isn't set properly, cannot continue"
+        exit 1
+fi
+
+%if %{with debug}
+%define debug --enable-debug
+%else
+%define debug --disable-debug
+%endif
+
+%if %{with debug_dmu_tx}
+%define debug_dmu_tx --enable-debug-dmu-tx
+%else
+%define debug_dmu_tx --disable-debug-dmu-tx
+%endif
+
+%setup -n %{kmod_name}-%{version}
+%build
+%configure \
+        --with-config=kernel \
+        --with-linux=%{ksrc} \
+        --with-linux-obj=%{kobj} \
+        --with-spl="%{splsrc}" \
+        --with-spl-obj="%{splobj}" \
+        %{debug} \
+        %{debug_dmu_tx}
+make %{?_smp_mflags}
+
+%install
+make install \
+        DESTDIR=${RPM_BUILD_ROOT} \
+        INSTALL_MOD_DIR=extra/%{kmod_name}
+%{__rm} -f %{buildroot}/lib/modules/%{kverrel}/modules.*
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files -n kmod-%{kmod_name}-devel
+%{_usrsrc}/%{kmod_name}-%{version}

rpm/redhat/zfs.spec.in

@@ -0,0 +1 @@
+../generic/zfs.spec.in