This tool reads modules.devname from the current kernel directory and outputs
the information. By default in a human-readable format, and optionally in
machine-readable formats.
For now only the tmpfiles.d(5) format is supported, but more could easily be
added in the future if there is a need.
This means nothing but kmod needs to reads the private files under
/lib/modules/. In particular systemd-udevd can stop reading modules.devname.
Cc: <linux-hotplug@xxxxxxxxxxxxxxx>
Cc: <systemd-devel@xxxxxxxxxxxxxxxxxxxxx>tools: static-nodes
---
v3: dropped the systemd integration for now, we can decide on that separately
added human-readable format and use this by default
added a --format= switch to get the tmpfiles format
Makefile.am | 3 +-
tools/kmod.c | 1 +
tools/kmod.h | 1 +
tools/static-nodes.c | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 180 insertions(+), 1 deletion(-)
create mode 100644 tools/static-nodes.c
diff --git a/Makefile.am b/Makefile.am
index fe4c769..b1bfd59 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -110,7 +110,8 @@ 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
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..3d0582a
--- /dev/null
+++ b/tools/static-nodes.c
@@ -0,0 +1,176 @@
+/*
+ * 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:f:h";
+static const struct option cmdopts[] = {
+ { "output", required_argument, 0, 'o'},
+ { "format", required_argument, 0, 'f'},
+ { "help", no_argument, 0, 'h'},
+ { },
+};
+
+static void help(void)
+{
+ printf("Usage:\n"
+ "\t%s static-nodes [options]\n"
+ "\n"
+ "kmod static-nodes outputs the static-node information of the currently running kernel.\n"
+ "\n"
+ "Options:\n"
+ "\t-f, --format=FORMAT use a machine-readable format\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) format used by systemd-tmpfiles.\n",
+ program_invocation_short_name);
+}
+
+static void write_human(FILE *out, char module[], char devname[], char type, unsigned int maj, unsigned int min)
+{
+ fprintf(out,
+ "Module: %s\n"
+ "\tDevice node: /dev/%s\n"
+ "\t\tType: %s device\n"
+ "\t\tMajor: %u\n"
+ "\t\tMinor: %u\n",
+ module, devname, (type == 'c') ? "character" : "block", maj, min);
+ return;
+}
+
+static void write_tmpfile(FILE *out, char devname[], char type, unsigned int maj, unsigned int min)
+{
+ fprintf(out, "%c /dev/%s 0600 - - - %u:%u\n", type, devname, maj, min);
+ return;
+}
+
+static int do_static_nodes(int argc, char *argv[])
+{
+ struct utsname kernel;
+ char modules[PATH_MAX];
+ FILE *in = NULL, *out = stdout;
+ bool human_readable = 1;
+ char buf[4096];
+ int ret = EXIT_SUCCESS;
+
+ for (;;) {
+ int c, idx = 0;
+
+ c = getopt_long(argc, argv, 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 'f':
+ if (!streq(optarg, "tmpfiles")) {
+ fprintf(stderr, "Unknown format: '%s'.\n", argv[1]);
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ human_readable = 0;
+ 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 (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;
+ }
+
+ while (fgets(buf, sizeof(buf), in) != NULL) {
+ char module[PATH_MAX];
+ char devname[PATH_MAX];
+ char type;
+ unsigned int maj, min;
+ int matches;
+
+ if (buf[0] == '#')
+ continue;
+
+ matches = sscanf(buf, "%s %s %c%u:%u", module, devname, &type, &maj, &min);
+ if (matches != 5 || (type != 'c' && type != 'b')) {
+ fprintf(stderr, "Error: invalid devname entry: %s", buf);
+ ret = EXIT_FAILURE;
+ continue;
+ }
+
+ if (human_readable)
+ write_human(out, module, devname, type, maj, min);
+ else
+ write_tmpfile(out, devname, type, maj, min);
+ }
+
+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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