add BUILD_EXCLUSIVE_CONFIG

support build exclusion depending on kernel features being present/absent,
e.g. BUILD_EXCLUSIVE_CONFIG="CONFIG_FOO !CONFIG_BAR"

Closes dell#219

Author: anbe42

dkms.8.in

@@ -682,6 +682,16 @@ This optional directive functions very similarly to
 except that it matches against the kernel architecture. For example, if you set
 it to ="i.86", your module would not be built for ia32e, x86_64, amd64, s390, etc.
 .TP
+.B BUILD_EXCLUSIVE_CONFIG=
+This optional directive allows you to specify a space separated list of
+kernel configuration options ("CONFIG_FOO") that must be enabled in the
+targeted kernels ".config" file (either to be compiled in or to be built
+as a module) or absent (if prefixed with an exclamation mark, e.g.
+"!CONFIG_BAR") in order to build the module.
+For example, if you set it as ="CONFIG_PCI !CONFIG_PREEMPT_RT", your module
+would only be built for kernels that have PCI enabled, but the RT patchset
+disabled.
+.TP
 .B POST_ADD=
 The name of the script to be run after an
 .B add

dkms.in

@@ -27,7 +27,7 @@ shopt -s extglob
 # The last group of variables has been deprecated
 readonly dkms_conf_variables="CLEAN PACKAGE_NAME
    PACKAGE_VERSION POST_ADD POST_BUILD POST_INSTALL POST_REMOVE PRE_BUILD
-   PRE_INSTALL BUILD_DEPENDS BUILD_EXCLUSIVE_ARCH
+   PRE_INSTALL BUILD_DEPENDS BUILD_EXCLUSIVE_ARCH BUILD_EXCLUSIVE_CONFIG
    BUILD_EXCLUSIVE_KERNEL BUILD_EXCLUSIVE_KERNEL_MIN BUILD_EXCLUSIVE_KERNEL_MAX
    build_exclude OBSOLETE_BY MAKE MAKE_MATCH
    PATCH PATCH_MATCH patch_array BUILT_MODULE_NAME
@@ -625,6 +625,15 @@ read_conf()
     [[ $BUILD_EXCLUSIVE_KERNEL_MIN && "$(VER "$1")" < "$(VER "$BUILD_EXCLUSIVE_KERNEL_MIN")" ]] && build_exclude="yes"
     [[ $BUILD_EXCLUSIVE_KERNEL_MAX && "$(VER "$1")" > "$(VER "$BUILD_EXCLUSIVE_KERNEL_MAX")" ]] && build_exclude="yes"
     [[ $BUILD_EXCLUSIVE_ARCH && ! $2 =~ $BUILD_EXCLUSIVE_ARCH ]] && build_exclude="yes"
+    if [[ $BUILD_EXCLUSIVE_CONFIG && -e "${kernel_config}" ]]; then
+        local kconf
+        for kconf in $BUILD_EXCLUSIVE_CONFIG ; do
+            case "$kconf" in
+                !*) grep -q -E "^${kconf#!}=[ym]" "${kernel_config}" && build_exclude="yes" ;;
+                *)  grep -q -E "^${kconf}=[ym]" "${kernel_config}" || build_exclude="yes" ;;
+            esac
+        done
+    fi
 
     # Fail if absolutely no DEST_MODULE_LOCATION
     if ((${#dest_module_location[@]} == 0)); then
@@ -1023,7 +1032,7 @@ prepare_build()
 
     # Error out if build_exclude is set
     [[ $build_exclude ]] && die 77 \
-        $"The $base_dir/dkms.conf for module $module includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch."\
+        $"The $base_dir/dkms.conf for module $module includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config."\
         $"This indicates that it should not be built."
 
     # Error out if source_tree is basically empty (binary-only dkms tarball w/ --force check)

run_test.sh

@@ -1247,7 +1247,7 @@ fi
 echo '(Not) building the build-exclusive test module'
 set_signing_message "dkms_build_exclusive_test" "1.0"
 run_with_expected_error 77 dkms build -k "${KERNEL_VER}" -m dkms_build_exclusive_test -v 1.0 << EOF
-Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
 EOF
 run_status_with_expected_output 'dkms_build_exclusive_test' << EOF
@@ -1256,7 +1256,7 @@ EOF
 
 echo "Running dkms autoinstall (1 x skip)"
 run_with_expected_output dkms autoinstall -k "${KERNEL_VER}" << EOF
-Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
 dkms autoinstall on ${KERNEL_VER}/${KERNEL_ARCH} was skipped for dkms_build_exclusive_test
 EOF
@@ -1274,7 +1274,7 @@ EOF
 
 echo "Running dkms autoinstall (1 x skip, 1 x pass)"
 run_with_expected_output dkms autoinstall -k "${KERNEL_VER}" << EOF
-Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
 
 Building module:
@@ -1323,7 +1323,7 @@ EOF
 
 echo "Running dkms autoinstall (1 x skip, 1 x fail, 1 x pass) (expected error)"
 run_with_expected_error 11 dkms autoinstall -k "${KERNEL_VER}" << EOF
-Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
 
 Building module:
@@ -1393,9 +1393,9 @@ fi
 
 echo "Running dkms autoinstall (2 x skip, with dependency)"
 run_with_expected_output dkms autoinstall -k "${KERNEL_VER}" << EOF
-Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
-Error! The /var/lib/dkms/dkms_build_exclusive_dependencies_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_dependencies_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch.
+Error! The /var/lib/dkms/dkms_build_exclusive_dependencies_test/1.0/${KERNEL_VER}/${KERNEL_ARCH}/dkms.conf for module dkms_build_exclusive_dependencies_test includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch/config.
 This indicates that it should not be built.
 dkms autoinstall on ${KERNEL_VER}/${KERNEL_ARCH} was skipped for dkms_build_exclusive_test dkms_build_exclusive_dependencies_test
 EOF