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path: root/modutils/depmod.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * depmod - generate modules.dep
4 * Copyright (c) 2008 Bernhard Reutner-Fischer
5 * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
6 * Copyright (c) 2008 Vladimir Dronnikov
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
10//config:config DEPMOD
11//config: bool "depmod"
12//config: default n
13//config: depends on !MODPROBE_SMALL
14//config: select PLATFORM_LINUX
15//config: help
16//config: depmod generates modules.dep (and potentially modules.alias
17//config: and modules.symbols) that contain dependency information
18//config: for modprobe.
19
20//applet:IF_DEPMOD(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP))
21
22//kbuild:lib-$(CONFIG_DEPMOD) += depmod.o modutils.o
23
24#include "libbb.h"
25#include "modutils.h"
26#include <sys/utsname.h> /* uname() */
27
28/*
29 * Theory of operation:
30 * - iterate over all modules and record their full path
31 * - iterate over all modules looking for "depends=" entries
32 * for each depends, look through our list of full paths and emit if found
33 */
34
35static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
36 void *data, int depth UNUSED_PARAM)
37{
38 module_db *modules = data;
39 char *image, *ptr;
40 module_entry *e;
41
42 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
43 size_t len = (64*1024*1024 - 4096);
44
45 if (strrstr(fname, ".ko") == NULL)
46 return TRUE;
47
48 image = xmalloc_open_zipped_read_close(fname, &len);
49
50 e = moddb_get_or_create(modules, bb_get_last_path_component_nostrip(fname));
51 e->name = xstrdup(fname + 2); /* skip "./" */
52
53 for (ptr = image; ptr < image + len - 10; ptr++) {
54 if (is_prefixed_with(ptr, "depends=")) {
55 char *u;
56
57 ptr += 8;
58 for (u = ptr; *u; u++)
59 if (*u == '-')
60 *u = '_';
61 ptr += string_to_llist(ptr, &e->deps, ",");
62 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
63 && is_prefixed_with(ptr, "alias=")
64 ) {
65 llist_add_to(&e->aliases, xstrdup(ptr + 6));
66 ptr += strlen(ptr);
67 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
68 && is_prefixed_with(ptr, "__ksymtab_")
69 ) {
70 ptr += 10;
71 if (is_prefixed_with(ptr, "gpl")
72 || strcmp(ptr, "strings") == 0
73 ) {
74 continue;
75 }
76 llist_add_to(&e->symbols, xstrdup(ptr));
77 ptr += strlen(ptr);
78 }
79 }
80 free(image);
81
82 return TRUE;
83}
84
85static void order_dep_list(module_db *modules, module_entry *start, llist_t *add)
86{
87 module_entry *m;
88 llist_t *n;
89
90 for (n = add; n != NULL; n = n->link) {
91 m = moddb_get(modules, n->data);
92 if (m == NULL)
93 continue;
94
95 /* unlink current entry */
96 m->dnext->dprev = m->dprev;
97 m->dprev->dnext = m->dnext;
98
99 /* and add it to tail */
100 m->dnext = start;
101 m->dprev = start->dprev;
102 start->dprev->dnext = m;
103 start->dprev = m;
104
105 /* recurse */
106 order_dep_list(modules, start, m->deps);
107 }
108}
109
110static void xfreopen_write(const char *file, FILE *f)
111{
112 if (freopen(file, "w", f) == NULL)
113 bb_perror_msg_and_die("can't open '%s'", file);
114}
115
116//usage:#if !ENABLE_MODPROBE_SMALL
117//usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
118//usage:#define depmod_full_usage "\n\n"
119//usage: "Generate modules.dep, alias, and symbols files"
120//usage: "\n"
121//usage: "\n -b BASE Use BASE/lib/modules/VERSION"
122//usage: "\n -n Dry run: print files to stdout"
123//usage:#endif
124
125/* Upstream usage:
126 * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
127 * -a --all
128 * Probe all modules. Default if no MODFILES.
129 * -A --quick
130 * Check modules.dep's mtime against module files' mtimes.
131 * -b --basedir BASE
132 * Use $BASE/lib/modules/VERSION
133 * -C --config FILE or DIR
134 * Path to /etc/depmod.conf or /etc/depmod.d/
135 * -e --errsyms
136 * When combined with the -F option, this reports any symbols
137 * which are not supplied by other modules or kernel.
138 * -F --filesyms System.map
139 * -n --dry-run
140 * Print modules.dep etc to standard output
141 * -v --verbose
142 * Print to stdout all the symbols each module depends on
143 * and the module's file name which provides that symbol.
144 * -r No-op
145 * -u No-op
146 * -q No-op
147 *
148 * So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]...
149 * Accepted but ignored:
150 * -aAe
151 * -F System.map
152 * -C FILE/DIR
153 *
154 * Not accepted: -v
155 */
156enum {
157 //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
158 //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
159 OPT_b = (1 << 2), /* base directory when modules are in staging area */
160 //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
161 //OPT_F = (1 << 4), /* System.map that contains the symbols */
162 OPT_n = (1 << 5), /* dry-run, print to stdout only */
163 OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
164 OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
165 OPT_q = (1 << 8), /* -q,--quiet: ignored */
166 OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
167};
168
169int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
170int depmod_main(int argc UNUSED_PARAM, char **argv)
171{
172 module_db modules;
173 module_entry *m, *dep;
174 const char *moddir_base = "/";
175 char *moddir, *version;
176 struct utsname uts;
177 unsigned i;
178 int tmp;
179
180 getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
181 argv += optind;
182
183 /* goto modules location */
184 xchdir(moddir_base);
185
186 /* If a version is provided, then that kernel version's module directory
187 * is used, rather than the current kernel version (as returned by
188 * "uname -r"). */
189 if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
190 version = *argv++;
191 } else {
192 uname(&uts);
193 version = uts.release;
194 }
195 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
196 xchdir(moddir);
197 if (ENABLE_FEATURE_CLEAN_UP)
198 free(moddir);
199
200 /* Scan modules */
201 memset(&modules, 0, sizeof(modules));
202 if (*argv) {
203 do {
204 parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
205 } while (*++argv);
206 } else {
207 recursive_action(".", ACTION_RECURSE,
208 parse_module, NULL, &modules, 0);
209 }
210
211 /* Generate dependency and alias files */
212 if (!(option_mask32 & OPT_n))
213 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
214
215 moddb_foreach_module(&modules, m, i) {
216 printf("%s:", m->name);
217
218 order_dep_list(&modules, m, m->deps);
219 while (m->dnext != m) {
220 dep = m->dnext;
221 printf(" %s", dep->name);
222
223 /* unlink current entry */
224 dep->dnext->dprev = dep->dprev;
225 dep->dprev->dnext = dep->dnext;
226 dep->dnext = dep->dprev = dep;
227 }
228 bb_putchar('\n');
229 }
230
231#if ENABLE_FEATURE_MODUTILS_ALIAS
232 if (!(option_mask32 & OPT_n))
233 xfreopen_write("modules.alias", stdout);
234 moddb_foreach_module(&modules, m, i) {
235 while (m->aliases) {
236 /*
237 * Last word used to be a basename
238 * (filename with path and .ko.* stripped)
239 * at the time of module-init-tools 3.4.
240 * kmod v.12 uses module name, i.e., s/-/_/g.
241 */
242 printf("alias %s %s\n",
243 (char*)llist_pop(&m->aliases),
244 m->modname);
245 }
246 }
247#endif
248#if ENABLE_FEATURE_MODUTILS_SYMBOLS
249 if (!(option_mask32 & OPT_n))
250 xfreopen_write("modules.symbols", stdout);
251 moddb_foreach_module(&modules, m, i) {
252 while (m->symbols) {
253 printf("alias symbol:%s %s\n",
254 (char*)llist_pop(&m->symbols),
255 m->modname);
256 }
257 }
258#endif
259
260 if (ENABLE_FEATURE_CLEAN_UP)
261 moddb_free(&modules);
262
263 return EXIT_SUCCESS;
264}
265
generated by cgit at 2024-05-14 15:03:10 (GMT)