This tool reads modules.devname from the current kernel directory and outputs
the information.
For now only the tmpfiles.d(5) format is supported, but more could easily be
added in the future if there is a need.
When booting with systemd, the new tool is called at boot to instruct
systemd-tmpfiles to create the necessary static modules before starting
systemd-udevd.
This means nothing but kmod needs to reads the private files under /lib/modules/.
Cc: <linux-hotplug@xxxxxxxxxxxxxxx>
Cc: <systemd-devel@xxxxxxxxxxxxxxxxxxxxx>
---
v2: adressed concerns raised by Dave, and made the tool a bit more generic so
more output formats may be added in the future as suggested by Lucas. Also
included the systemd unit file to hook this up with systemd.
Makefile.am | 20 ++++-
configure.ac | 8 ++
tools/kmod-static-nodes.service.in | 16 ++++
tools/kmod.c | 1 +
tools/kmod.h | 1 +
tools/static-nodes.c | 163 +++++++++++++++++++++++++++++++++++++
6 files changed, 207 insertions(+), 2 deletions(-)
create mode 100644 tools/kmod-static-nodes.service.in
create mode 100644 tools/static-nodes.c
diff --git a/Makefile.am b/Makefile.am
index 9feaf96..333e861 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -36,6 +36,9 @@ SED_PROCESS = \
%.pc: %.pc.in Makefile
$(SED_PROCESS)
+%.service: %.service.in Makefile
+ $(SED_PROCESS)
+
LIBKMOD_CURRENT=4
LIBKMOD_REVISION=2
LIBKMOD_AGE=2
@@ -88,6 +91,17 @@ pkgconfig_DATA = libkmod/libkmod.pc
EXTRA_DIST += libkmod/libkmod.pc.in
CLEANFILES += libkmod/libkmod.pc
+if HAVE_SYSTEMD
+systemdsystemunit_DATA = tools/kmod-static-nodes.service
+EXTRA_DIST += tools/kmod-static-nodes.service.in
+CLEANFILES += tools/kmod-static-nodes.service
+
+install-data-hook:
+ $(MKDIR_P) $(DESTDIR)$(systemdsystemunitdir)/sysinit.target.wants
+ ln -sf ../kmod-static-nodes.service \
+ $(DESTDIR)$(systemdsystemunitdir)/sysinit.target.wants/kmod-static-nodes.service
+endif
+
install-exec-hook:
if test "$(libdir)" != "$(rootlibdir)"; then \
$(MKDIR_P) $(DESTDIR)$(rootlibdir) && \
@@ -109,7 +123,8 @@ noinst_SCRIPTS = tools/insmod tools/rmmod tools/lsmod \
tools_kmod_SOURCES = tools/kmod.c tools/kmod.h tools/lsmod.c \
tools/rmmod.c tools/insmod.c \
tools/modinfo.c tools/modprobe.c \
- tools/depmod.c tools/log.h tools/log.c
+ tools/depmod.c tools/log.h tools/log.c \
+ tools/static-nodes.c
tools_kmod_LDADD = libkmod/libkmod-util.la \
libkmod/libkmod.la
@@ -211,7 +226,8 @@ testsuite-distclean:
DISTCLEAN_LOCAL_HOOKS += testsuite-distclean
EXTRA_DIST += testsuite/rootfs-pristine
-DISTCHECK_CONFIGURE_FLAGS=--enable-gtk-doc --sysconfdir=/etc --with-zlib
+DISTCHECK_CONFIGURE_FLAGS=--enable-gtk-doc --sysconfdir=/etc --with-zlib \
+ --with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)
distclean-local: $(DISTCLEAN_LOCAL_HOOKS)
diff --git a/configure.ac b/configure.ac
index 566b317..af5ed52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -76,6 +76,13 @@ AS_IF([test "x$with_zlib" != "xno"], [
AC_MSG_NOTICE([zlib support not requested])
])
+AC_ARG_WITH([systemdsystemunitdir],
+ AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
+ [], [with_systemdsystemunitdir=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)])
+if test "x$with_systemdsystemunitdir" != xno; then
+ AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
+fi
+AM_CONDITIONAL(HAVE_SYSTEMD, [test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ])
#####################################################################
# --enable-
@@ -200,6 +207,7 @@ AC_MSG_RESULT([
compiler: ${CC}
cflags: ${with_cflags} ${CFLAGS}
ldflags: ${with_ldflags} ${LDFLAGS}
+ systemdsystemunitdir: ${with_systemdsystemunitdir}
tools: ${enable_tools}
logging: ${enable_logging}
diff --git a/tools/kmod-static-nodes.service.in b/tools/kmod-static-nodes.service.in
new file mode 100644
index 0000000..be8482e
--- /dev/null
+++ b/tools/kmod-static-nodes.service.in
@@ -0,0 +1,16 @@
+# This file is part of kmod.
+#
+# kmod is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+[Unit]
+Description=Create list of static nodes to be created in /dev
+DefaultDependencies=no
+Before=sysinit.target systemd-static-nodes.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/mkdir -p /run/tmpfiles.d
+ExecStart=@prefix@/bin/kmod static-nodes tmpfiles --output=/run/tmpfiles.d/kmod.conf
diff --git a/tools/kmod.c b/tools/kmod.c
index ebb8875..347bb7d 100644
--- a/tools/kmod.c
+++ b/tools/kmod.c
@@ -37,6 +37,7 @@ static const struct kmod_cmd kmod_cmd_help;
static const struct kmod_cmd *kmod_cmds[] = {
&kmod_cmd_help,
&kmod_cmd_list,
+ &kmod_cmd_static_nodes,
};
static const struct kmod_cmd *kmod_compat_cmds[] = {
diff --git a/tools/kmod.h b/tools/kmod.h
index 80fa4c2..68a646a 100644
--- a/tools/kmod.h
+++ b/tools/kmod.h
@@ -35,5 +35,6 @@ extern const struct kmod_cmd kmod_cmd_compat_modprobe;
extern const struct kmod_cmd kmod_cmd_compat_depmod;
extern const struct kmod_cmd kmod_cmd_list;
+extern const struct kmod_cmd kmod_cmd_static_nodes;
#include "log.h"
diff --git a/tools/static-nodes.c b/tools/static-nodes.c
new file mode 100644
index 0000000..a79fc3d
--- /dev/null
+++ b/tools/static-nodes.c
@@ -0,0 +1,163 @@
+/*
+ * kmod-static-nodes - manage modules.devname
+ *
+ * Copyright (C) 2004-2012 Kay Sievers <kay@xxxxxxxx>
+ * Copyright (C) 2011-2013 ProFUSION embedded systems
+ * Copyright (C) 2013 Tom Gundersen <teg@xxxxxxx>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <getopt.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <sys/utsname.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "libkmod-util.h"
+
+#include "kmod.h"
+
+static const char cmdopts_s[] = "o:h";
+static const struct option cmdopts[] = {
+ { "output", required_argument, 0, 'o'},
+ { "help", no_argument, 0, 'h'},
+ { },
+};
+
+static void help(void)
+{
+ printf("Usage:\n"
+ "\t%s static-nodes format [options]\n"
+ "\n"
+ "kmod static-nodes outputs the static-node information of the currently running kernel.\n"
+ "\n"
+ "Options:\n"
+ "\t-o, --output=FILE write output to file\n"
+ "\t-h, --help show this help\n"
+ "\n"
+ "Formats:\n"
+ " tmpfiles the tmpfiles.d(5) used by systemd-tmpfiles.\n",
+ program_invocation_short_name);
+}
+
+static int write_tmpfile(FILE *in, FILE *out) {
+ char buf[4096];
+ int ret = EXIT_SUCCESS;
+
+ while (fgets(buf, sizeof(buf), in) != NULL) {
+ char devname[PATH_MAX];
+ char type;
+ unsigned int maj, min;
+ int matches;
+
+ if (buf[0] == '#')
+ continue;
+
+ matches = sscanf(buf, "%*s %s %c%u:%u", devname, &type, &maj, &min);
+ if (matches != 4 || (type != 'c' && type != 'b')) {
+ fprintf(stderr, "Error: invalid devname entry: %s", buf);
+ ret = EXIT_FAILURE;
+ continue;
+ }
+
+ fprintf(out, "%c /dev/%s 0600 - - - %u:%u\n", type, devname, maj, min);
+ }
+
+ return ret;
+}
+
+static int do_static_nodes(int argc, char *argv[])
+{
+ struct utsname kernel;
+ char modules[PATH_MAX];
+ FILE *in = NULL, *out = stdout;
+ int ret = EXIT_SUCCESS;
+
+ for (;;) {
+ int c, idx = 0;
+
+ c = getopt_long(argc - 1, argv + 1, cmdopts_s, cmdopts, &idx);
+ if (c == -1) {
+ break;
+ }
+ switch (c) {
+ case 'o':
+ out = fopen(optarg, "we");
+ if (out == NULL) {
+ fprintf(stderr, "Error: could not create %s!\n", optarg);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ break;
+ case 'h':
+ help();
+ goto finish;
+ case '?':
+ ret = EXIT_FAILURE;
+ goto finish;
+ default:
+ fprintf(stderr, "Unexpected commandline option '%c'.\n", c);
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ }
+
+ if (argc < 2) {
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ if (!streq(argv[1], "tmpfiles")) {
+ fprintf(stderr, "Unknown format: '%s'.\n", argv[1]);
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ if (uname(&kernel) < 0) {
+ fputs("Error: uname failed!\n", stderr);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ snprintf(modules, sizeof(modules), "/lib/modules/%s/modules.devname", kernel.release);
+ in = fopen(modules, "re");
+ if (in == NULL && errno != ENOENT) {
+ fprintf(stderr, "Error: could not open /lib/modules/%s/modules.devname!\n", kernel.release);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ ret = write_tmpfile(in, out);
+
+finish:
+ if (in)
+ fclose(in);
+ if (out)
+ fclose(out);
+ return ret;
+}
+
+const struct kmod_cmd kmod_cmd_static_nodes = {
+ .name = "static-nodes",
+ .cmd = do_static_nodes,
+ .help = "outputs the static-node information of the currently running kernel",
+};
--
1.8.2.1
--
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