2 * kmod-static-nodes - manage modules.devname
4 * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
5 * Copyright (C) 2011-2013 ProFUSION embedded systems
6 * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include <sys/utsname.h>
32 #include <sys/types.h>
34 #include <shared/util.h>
38 struct static_nodes_format
{
40 int (*write
)(FILE *, char[], char[], char, unsigned int, unsigned int);
41 const char *description
;
44 static const struct static_nodes_format static_nodes_format_human
;
45 static const struct static_nodes_format static_nodes_format_tmpfiles
;
46 static const struct static_nodes_format static_nodes_format_devname
;
48 static const struct static_nodes_format
*static_nodes_formats
[] = {
49 &static_nodes_format_human
,
50 &static_nodes_format_tmpfiles
,
51 &static_nodes_format_devname
,
54 static const char cmdopts_s
[] = "o:f:h";
55 static const struct option cmdopts
[] = {
56 { "output", required_argument
, 0, 'o'},
57 { "format", required_argument
, 0, 'f'},
58 { "help", no_argument
, 0, 'h'},
62 static int write_human(FILE *out
, char modname
[], char devname
[], char type
, unsigned int maj
, unsigned int min
)
68 "\tDevice node: /dev/%s\n"
69 "\t\tType: %s device\n"
73 (type
== 'c') ? "character" : "block", maj
, min
);
80 static const struct static_nodes_format static_nodes_format_human
= {
83 .description
= "(default) a human readable format. Do not parse.",
86 static int write_tmpfiles(FILE *out
, char modname
[], char devname
[], char type
, unsigned int maj
, unsigned int min
)
91 dir
= strrchr(devname
, '/');
93 ret
= fprintf(out
, "d /dev/%.*s 0755 - - -\n",
94 (int)(dir
- devname
), devname
);
99 ret
= fprintf(out
, "%c /dev/%s 0600 - - - %u:%u\n",
100 type
, devname
, maj
, min
);
107 static const struct static_nodes_format static_nodes_format_tmpfiles
= {
109 .write
= write_tmpfiles
,
110 .description
= "the tmpfiles.d(5) format used by systemd-tmpfiles.",
113 static int write_devname(FILE *out
, char modname
[], char devname
[], char type
, unsigned int maj
, unsigned int min
)
117 ret
= fprintf(out
, "%s %s %c%u:%u\n", modname
, devname
, type
, maj
, min
);
124 static const struct static_nodes_format static_nodes_format_devname
= {
126 .write
= write_devname
,
127 .description
= "the modules.devname format.",
130 static void help(void)
135 "\t%s static-nodes [options]\n"
137 "kmod static-nodes outputs the static-node information of the currently running kernel.\n"
140 "\t-f, --format=FORMAT choose format to use: see \"Formats\"\n"
141 "\t-o, --output=FILE write output to file\n"
142 "\t-h, --help show this help\n"
145 program_invocation_short_name
);
147 for (i
= 0; i
< ARRAY_SIZE(static_nodes_formats
); i
++) {
148 if (static_nodes_formats
[i
]->description
!= NULL
) {
149 printf("\t%-12s %s\n", static_nodes_formats
[i
]->name
,
150 static_nodes_formats
[i
]->description
);
155 static int do_static_nodes(int argc
, char *argv
[])
157 struct utsname kernel
;
158 char modules
[PATH_MAX
], buf
[4096];
159 const char *output
= "/dev/stdout";
160 FILE *in
= NULL
, *out
= NULL
;
161 const struct static_nodes_format
*format
= &static_nodes_format_human
;
162 int r
, ret
= EXIT_SUCCESS
;
165 int c
, idx
= 0, valid
;
168 c
= getopt_long(argc
, argv
, cmdopts_s
, cmdopts
, &idx
);
179 for (i
= 0; i
< ARRAY_SIZE(static_nodes_formats
); i
++) {
180 if (streq(static_nodes_formats
[i
]->name
, optarg
)) {
181 format
= static_nodes_formats
[i
];
187 fprintf(stderr
, "Unknown format: '%s'.\n",
201 fprintf(stderr
, "Unexpected commandline option '%c'.\n",
209 if (uname(&kernel
) < 0) {
210 fputs("Error: uname failed!\n", stderr
);
215 snprintf(modules
, sizeof(modules
), "/lib/modules/%s/modules.devname", kernel
.release
);
216 in
= fopen(modules
, "re");
218 if (errno
== ENOENT
) {
219 fprintf(stderr
, "Warning: /lib/modules/%s/modules.devname not found - ignoring\n",
223 fprintf(stderr
, "Error: could not open /lib/modules/%s/modules.devname - %m\n",
230 r
= mkdir_parents(output
, 0755);
232 fprintf(stderr
, "Error: could not create parent directory for %s - %m.\n", output
);
237 out
= fopen(output
, "we");
239 fprintf(stderr
, "Error: could not create %s - %m\n", output
);
244 while (fgets(buf
, sizeof(buf
), in
) != NULL
) {
245 char modname
[PATH_MAX
];
246 char devname
[PATH_MAX
];
248 unsigned int maj
, min
;
254 matches
= sscanf(buf
, "%s %s %c%u:%u", modname
, devname
,
256 if (matches
!= 5 || (type
!= 'c' && type
!= 'b')) {
257 fprintf(stderr
, "Error: invalid devname entry: %s", buf
);
262 format
->write(out
, modname
, devname
, type
, maj
, min
);
273 const struct kmod_cmd kmod_cmd_static_nodes
= {
274 .name
= "static-nodes",
275 .cmd
= do_static_nodes
,
276 .help
= "outputs the static-node information installed with the currently running kernel",