build-sys: make loadable module support optional

kmod is unecessary if loadable module support is disabled in the kernel,
so make the dependency optional.

Makefile.am

@@ -234,7 +234,6 @@ rootlibexec_PROGRAMS = \
 	systemd-update-utmp \
 	systemd-shutdownd \
 	systemd-shutdown \
-	systemd-modules-load \
 	systemd-remount-fs \
 	systemd-reply-password \
 	systemd-fsck \
@@ -243,6 +242,11 @@ rootlibexec_PROGRAMS = \
 	systemd-sysctl \
 	systemd-sleep
 
+if HAVE_KMOD
+rootlibexec_PROGRAMS += \
+	systemd-modules-load
+endif
+
 systemgenerator_PROGRAMS = \
 	systemd-getty-generator \
 	systemd-fstab-generator \
@@ -323,7 +327,6 @@ nodist_systemunit_DATA = \
 	units/console-getty.service \
 	units/systemd-initctl.service \
 	units/systemd-shutdownd.service \
-	units/systemd-modules-load.service \
 	units/systemd-remount-fs.service \
 	units/systemd-update-utmp-runlevel.service \
 	units/systemd-update-utmp-shutdown.service \
@@ -349,6 +352,11 @@ nodist_systemunit_DATA = \
 	units/systemd-udev-settle.service \
 	units/debug-shell.service
 
+if HAVE_KMOD
+nodist_systemunit_DATA += \
+	units/systemd-modules-load.service
+endif
+
 dist_userunit_DATA = \
 	units/user/default.target \
 	units/user/exit.target
@@ -364,7 +372,6 @@ EXTRA_DIST += \
 	units/rescue.service.m4.in \
 	units/systemd-initctl.service.in \
 	units/systemd-shutdownd.service.in \
-	units/systemd-modules-load.service.in \
 	units/systemd-remount-fs.service.in \
 	units/systemd-update-utmp-runlevel.service.in \
 	units/systemd-update-utmp-shutdown.service.in \
@@ -393,6 +400,11 @@ EXTRA_DIST += \
 	introspect.awk \
 	man/custom-html.xsl
 
+if HAVE_KMOD
+EXTRA_DIST += \
+	units/systemd-modules-load.service.in
+endif
+
 if TARGET_FEDORA
 dist_systemunit_DATA += \
 	units/fedora/rc-local.service \
@@ -481,8 +493,6 @@ MANPAGES = \
 	man/locale.conf.5 \
 	man/os-release.5 \
 	man/machine-info.5 \
-	man/modules-load.d.5 \
-	man/systemd-modules-load.service.8 \
 	man/sysctl.d.5 \
 	man/systemd-sysctl.service.8 \
 	man/systemd-ask-password.1 \
@@ -531,7 +541,6 @@ MANPAGES_ALIAS = \
 	man/reboot.8 \
 	man/poweroff.8 \
 	man/init.1 \
-	man/systemd-modules-load.8 \
 	man/systemd-sysctl.8 \
 	man/systemd-journald.socket.8 \
 	man/systemd-journald.8 \
@@ -603,10 +612,18 @@ MANPAGES_ALIAS = \
 	man/sd_journal_restart_unique.3 \
 	man/SD_JOURNAL_FOREACH_UNIQUE.3
 
+if HAVE_KMOD
+MANPAGES += \
+	man/modules-load.d.5 \
+	man/systemd-modules-load.service.8
+MANPAGES_ALIAS += \
+	man/systemd-modules-load.8
+man/systemd-modules-load.8: man/systemd-modules-load.service.8
+endif
+
 man/reboot.8: man/halt.8
 man/poweroff.8: man/halt.8
 man/init.1: man/systemd.1
-man/systemd-modules-load.8: man/systemd-modules-load.service.8
 man/systemd-sysctl.8: man/systemd-sysctl.service.8
 man/systemd-journald.socket.8: man/systemd-journald.service.8
 man/systemd-journald.8: man/systemd-journald.service.8
@@ -1015,8 +1032,6 @@ libsystemd_core_la_SOURCES = \
 	src/core/selinux-setup.h \
 	src/core/ima-setup.c \
 	src/core/ima-setup.h \
-	src/core/kmod-setup.c \
-	src/core/kmod-setup.h \
 	src/core/locale-setup.h \
 	src/core/locale-setup.c \
 	src/core/hostname-setup.c \
@@ -1052,6 +1067,12 @@ libsystemd_core_la_SOURCES = \
 	src/core/audit-fd.c \
 	src/core/audit-fd.h
 
+if HAVE_KMOD
+libsystemd_core_la_SOURCES += \
+	src/core/kmod-setup.c \
+	src/core/kmod-setup.h
+endif
+
 nodist_libsystemd_core_la_SOURCES = \
 	src/core/load-fragment-gperf.c \
 	src/core/load-fragment-gperf-nulstr.c \
@@ -1406,6 +1427,7 @@ systemd_shutdown_LDADD = \
 	libsystemd-shared.la \
 	libudev.la
 
+if HAVE_KMOD
 # ------------------------------------------------------------------------------
 systemd_modules_load_SOURCES = \
 	src/modules-load/modules-load.c
@@ -1417,6 +1439,7 @@ systemd_modules_load_CFLAGS = \
 systemd_modules_load_LDADD = \
 	libsystemd-shared.la \
 	$(KMOD_LIBS)
+endif
 
 # ------------------------------------------------------------------------------
 systemd_tmpfiles_SOURCES = \
@@ -1836,9 +1859,13 @@ dist_udevrules_DATA += \
 	rules/75-net-description.rules \
 	rules/75-tty-description.rules \
 	rules/78-sound-card.rules \
-	rules/80-drivers.rules \
 	rules/95-udev-late.rules
 
+if HAVE_KMOD
+dist_udevrules_DATA += \
+	rules/80-drivers.rules
+endif
+
 dist_udevhwdb_DATA = \
 	hwdb/20-pci-vendor-product.hwdb \
 	hwdb/20-pci-classes.hwdb \
@@ -1904,7 +1931,6 @@ libudev_core_la_SOURCES = \
 	src/udev/udev-builtin-firmware.c \
 	src/udev/udev-builtin-hwdb.c \
 	src/udev/udev-builtin-input_id.c \
-	src/udev/udev-builtin-kmod.c \
 	src/udev/udev-builtin-net_id.c \
 	src/udev/udev-builtin-path_id.c \
 	src/udev/udev-builtin-usb_id.c \
@@ -1926,6 +1952,11 @@ libudev_core_la_CPPFLAGS = \
 	$(AM_CPPFLAGS) \
 	-DFIRMWARE_PATH="$(FIRMWARE_PATH)"
 
+if HAVE_KMOD
+libudev_core_la_SOURCES += \
+	src/udev/udev-builtin-kmod.c
+endif
+
 if HAVE_BLKID
 libudev_core_la_SOURCES += \
 	src/udev/udev-builtin-blkid.c
@@ -4026,7 +4057,6 @@ systemd-install-data-hook:
 			sys-kernel-config.mount \
 			sys-kernel-debug.mount \
 			sys-fs-fuse-connections.mount \
-			systemd-modules-load.service \
 			systemd-tmpfiles-setup.service \
 			systemd-sysctl.service \
 			systemd-ask-password-console.path && \
@@ -4035,7 +4065,6 @@ systemd-install-data-hook:
 		$(LN_S) ../sys-kernel-config.mount sys-kernel-config.mount && \
 		$(LN_S) ../sys-kernel-debug.mount sys-kernel-debug.mount && \
 		$(LN_S) ../sys-fs-fuse-connections.mount sys-fs-fuse-connections.mount && \
-		$(LN_S) ../systemd-modules-load.service systemd-modules-load.service && \
 		$(LN_S) ../systemd-tmpfiles-setup.service systemd-tmpfiles-setup.service && \
 		$(LN_S) ../systemd-sysctl.service systemd-sysctl.service && \
 		$(LN_S) ../systemd-ask-password-console.path systemd-ask-password-console.path )
@@ -4046,6 +4075,13 @@ systemd-install-data-hook:
 		rm -f org.freedesktop.systemd1.service && \
 		$(LN_S) ../system-services/org.freedesktop.systemd1.service org.freedesktop.systemd1.service )
 
+if HAVE_KMOD
+	( cd $(DESTDIR)$(systemunitdir)/sysinit.target.wants && \
+		rm -f systemd-modules-load.service && \
+		$(LN_S) ../systemd-modules-load.service systemd-modules-load.service )
+endif
+
+
 if TARGET_FEDORA
 	( cd $(DESTDIR)$(systemunitdir) && \
 		rm -f display-manager.service single.service && \

README

@@ -40,8 +40,8 @@ REQUIREMENTS:
                 optional but strongly recommended: autofs4, ipv6
         dbus >= 1.4.0
         libcap
-        libblkid >= 2.20 (from util-linux)
+        libblkid >= 2.20 (from util-linux) (optional)
-        libkmod >= 5
+        libkmod >= 5 (optional)
         PAM >= 1.1.2 (optional)
         libcryptsetup (optional)
         libaudit (optional)

configure.ac

@@ -193,7 +193,18 @@ AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at], [], [], [[#include <sys/
 m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])
 
 PKG_CHECK_MODULES(DBUS, [dbus-1 >= 1.3.2])
-PKG_CHECK_MODULES(KMOD, [libkmod >= 5])
+
+# ------------------------------------------------------------------------------
+have_kmod=no
+AC_ARG_ENABLE(kmod, AS_HELP_STRING([--disable-kmod], [disable loadable modules support]))
+if test "x$enable_kmod" != "xno"; then
+        PKG_CHECK_MODULES(KMOD, [ libkmod >= 5 ],
+                [AC_DEFINE(HAVE_KMOD, 1, [Define if kmod is available]) have_kmod=yes], have_kmod=no)
+        if test "x$have_kmod" = xno -a "x$enable_kmod" = xyes; then
+                AC_MSG_ERROR([*** kmod support requested but libraries not found])
+        fi
+fi
+AM_CONDITIONAL(HAVE_KMOD, [test "$have_kmod" = "yes"])
 
 # ------------------------------------------------------------------------------
 have_blkid=no
@@ -860,6 +871,7 @@ AC_MSG_RESULT([
         timedated:               ${have_timedated}
         localed:                 ${have_localed}
         coredump:                ${have_coredump}
+        kmod:                    ${have_kmod}
         blkid:                   ${have_blkid}
         firmware path:           ${FIRMWARE_PATH}
         gudev:                   ${enable_gudev}

rules/75-probe_mtd.rules

@@ -3,6 +3,5 @@
 ACTION!="add", GOTO="mtd_probe_end"
 
 KERNEL=="mtd*ro", IMPORT{program}="mtd_probe $devnode"
-KERNEL=="mtd*ro", ENV{MTD_FTL}=="smartmedia", IMPORT{builtin}="kmod load sm_ftl"
 
 LABEL="mtd_probe_end"

rules/80-drivers.rules

@@ -8,5 +8,6 @@ SUBSYSTEM=="tifm", ENV{TIFM_CARD_TYPE}=="MS", IMPORT{builtin}="kmod load tifm_ms
 SUBSYSTEM=="memstick", IMPORT{builtin}="kmod load ms_block mspro_block"
 SUBSYSTEM=="i2o", IMPORT{builtin}="kmod load i2o_block"
 SUBSYSTEM=="module", KERNEL=="parport_pc", RUN{builtin}="kmod load ppdev"
+KERNEL=="mtd*ro", ENV{MTD_FTL}=="smartmedia", IMPORT{builtin}="kmod load sm_ftl"
 
 LABEL="drivers_end"

src/core/main.c

@@ -55,7 +55,9 @@
 
 #include "mount-setup.h"
 #include "loopback-setup.h"
+#ifdef HAVE_KMOD
 #include "kmod-setup.h"
+#endif
 #include "hostname-setup.h"
 #include "machine-id-setup.h"
 #include "locale-setup.h"
@@ -1574,7 +1576,9 @@ int main(int argc, char *argv[]) {
                 if (arg_show_status || plymouth_running())
                         status_welcome();
 
+#ifdef HAVE_KMOD
                 kmod_setup();
+#endif
                 hostname_setup();
                 machine_id_setup();
                 loopback_setup();

src/udev/udev-builtin.c

@@ -37,7 +37,9 @@ static const struct udev_builtin *builtins[] = {
         [UDEV_BUILTIN_FIRMWARE] = &udev_builtin_firmware,
         [UDEV_BUILTIN_HWDB] = &udev_builtin_hwdb,
         [UDEV_BUILTIN_INPUT_ID] = &udev_builtin_input_id,
+#ifdef HAVE_KMOD
         [UDEV_BUILTIN_KMOD] = &udev_builtin_kmod,
+#endif
         [UDEV_BUILTIN_NET_ID] = &udev_builtin_net_id,
         [UDEV_BUILTIN_PATH_ID] = &udev_builtin_path_id,
         [UDEV_BUILTIN_USB_ID] = &udev_builtin_usb_id,

src/udev/udev.h

@@ -141,7 +141,9 @@ enum udev_builtin_cmd {
         UDEV_BUILTIN_FIRMWARE,
         UDEV_BUILTIN_HWDB,
         UDEV_BUILTIN_INPUT_ID,
+#ifdef HAVE_KMOD
         UDEV_BUILTIN_KMOD,
+#endif
         UDEV_BUILTIN_NET_ID,
         UDEV_BUILTIN_PATH_ID,
         UDEV_BUILTIN_USB_ID,
@@ -166,7 +168,9 @@ extern const struct udev_builtin udev_builtin_btrfs;
 extern const struct udev_builtin udev_builtin_firmware;
 extern const struct udev_builtin udev_builtin_hwdb;
 extern const struct udev_builtin udev_builtin_input_id;
+#ifdef HAVE_KMOD
 extern const struct udev_builtin udev_builtin_kmod;
+#endif
 extern const struct udev_builtin udev_builtin_net_id;
 extern const struct udev_builtin udev_builtin_path_id;
 extern const struct udev_builtin udev_builtin_usb_id;