1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * builtin-buildid-cache.c
4 *
5 * Builtin buildid-cache command: Manages build-id cache
6 *
7 * Copyright (C) 2010, Red Hat Inc.
8 * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
9 */
10 #include <sys/types.h>
11 #include <sys/time.h>
12 #include <time.h>
13 #include <dirent.h>
14 #include <errno.h>
15 #include <unistd.h>
16 #include "builtin.h"
17 #include "namespaces.h"
18 #include "util/debug.h"
19 #include "util/header.h"
20 #include <subcmd/pager.h>
21 #include <subcmd/parse-options.h>
22 #include "util/strlist.h"
23 #include "util/build-id.h"
24 #include "util/session.h"
25 #include "util/dso.h"
26 #include "util/symbol.h"
27 #include "util/time-utils.h"
28 #include "util/util.h"
29 #include "util/probe-file.h"
30 #include "util/config.h"
31 #include <linux/string.h>
32 #include <linux/err.h>
33
build_id_cache__kcore_buildid(const char * proc_dir,char * sbuildid)34 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
35 {
36 char root_dir[PATH_MAX];
37 char *p;
38
39 strlcpy(root_dir, proc_dir, sizeof(root_dir));
40
41 p = strrchr(root_dir, '/');
42 if (!p)
43 return -1;
44 *p = '\0';
45 return sysfs__sprintf_build_id(root_dir, sbuildid);
46 }
47
build_id_cache__kcore_dir(char * dir,size_t sz)48 static int build_id_cache__kcore_dir(char *dir, size_t sz)
49 {
50 return fetch_current_timestamp(dir, sz);
51 }
52
same_kallsyms_reloc(const char * from_dir,char * to_dir)53 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)
54 {
55 char from[PATH_MAX];
56 char to[PATH_MAX];
57 const char *name;
58 u64 addr1 = 0, addr2 = 0;
59 int i, err = -1;
60
61 scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
62 scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);
63
64 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
65 err = kallsyms__get_function_start(from, name, &addr1);
66 if (!err)
67 break;
68 }
69
70 if (err)
71 return false;
72
73 if (kallsyms__get_function_start(to, name, &addr2))
74 return false;
75
76 return addr1 == addr2;
77 }
78
build_id_cache__kcore_existing(const char * from_dir,char * to_dir,size_t to_dir_sz)79 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir,
80 size_t to_dir_sz)
81 {
82 char from[PATH_MAX];
83 char to[PATH_MAX];
84 char to_subdir[PATH_MAX];
85 struct dirent *dent;
86 int ret = -1;
87 DIR *d;
88
89 d = opendir(to_dir);
90 if (!d)
91 return -1;
92
93 scnprintf(from, sizeof(from), "%s/modules", from_dir);
94
95 while (1) {
96 dent = readdir(d);
97 if (!dent)
98 break;
99 if (dent->d_type != DT_DIR)
100 continue;
101 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir,
102 dent->d_name);
103 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s",
104 to_dir, dent->d_name);
105 if (!compare_proc_modules(from, to) &&
106 same_kallsyms_reloc(from_dir, to_subdir)) {
107 strlcpy(to_dir, to_subdir, to_dir_sz);
108 ret = 0;
109 break;
110 }
111 }
112
113 closedir(d);
114
115 return ret;
116 }
117
build_id_cache__add_kcore(const char * filename,bool force)118 static int build_id_cache__add_kcore(const char *filename, bool force)
119 {
120 char dir[32], sbuildid[SBUILD_ID_SIZE];
121 char from_dir[PATH_MAX], to_dir[PATH_MAX];
122 char *p;
123
124 strlcpy(from_dir, filename, sizeof(from_dir));
125
126 p = strrchr(from_dir, '/');
127 if (!p || strcmp(p + 1, "kcore"))
128 return -1;
129 *p = '\0';
130
131 if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
132 return -1;
133
134 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
135 buildid_dir, DSO__NAME_KCORE, sbuildid);
136
137 if (!force &&
138 !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
139 pr_debug("same kcore found in %s\n", to_dir);
140 return 0;
141 }
142
143 if (build_id_cache__kcore_dir(dir, sizeof(dir)))
144 return -1;
145
146 scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
147 buildid_dir, DSO__NAME_KCORE, sbuildid, dir);
148
149 if (mkdir_p(to_dir, 0755))
150 return -1;
151
152 if (kcore_copy(from_dir, to_dir)) {
153 /* Remove YYYYmmddHHMMSShh directory */
154 if (!rmdir(to_dir)) {
155 p = strrchr(to_dir, '/');
156 if (p)
157 *p = '\0';
158 /* Try to remove buildid directory */
159 if (!rmdir(to_dir)) {
160 p = strrchr(to_dir, '/');
161 if (p)
162 *p = '\0';
163 /* Try to remove [kernel.kcore] directory */
164 rmdir(to_dir);
165 }
166 }
167 return -1;
168 }
169
170 pr_debug("kcore added to build-id cache directory %s\n", to_dir);
171
172 return 0;
173 }
174
build_id_cache__add_file(const char * filename,struct nsinfo * nsi)175 static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
176 {
177 char sbuild_id[SBUILD_ID_SIZE];
178 struct build_id bid;
179 int err;
180 struct nscookie nsc;
181
182 nsinfo__mountns_enter(nsi, &nsc);
183 err = filename__read_build_id(filename, &bid);
184 nsinfo__mountns_exit(&nsc);
185 if (err < 0) {
186 pr_debug("Couldn't read a build-id in %s\n", filename);
187 return -1;
188 }
189
190 build_id__sprintf(&bid, sbuild_id);
191 err = build_id_cache__add_s(sbuild_id, filename, nsi,
192 false, false);
193 pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
194 err ? "FAIL" : "Ok");
195 return err;
196 }
197
build_id_cache__remove_file(const char * filename,struct nsinfo * nsi)198 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
199 {
200 char sbuild_id[SBUILD_ID_SIZE];
201 struct build_id bid;
202 struct nscookie nsc;
203
204 int err;
205
206 nsinfo__mountns_enter(nsi, &nsc);
207 err = filename__read_build_id(filename, &bid);
208 nsinfo__mountns_exit(&nsc);
209 if (err < 0) {
210 pr_debug("Couldn't read a build-id in %s\n", filename);
211 return -1;
212 }
213
214 build_id__sprintf(&bid, sbuild_id);
215 err = build_id_cache__remove_s(sbuild_id);
216 pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
217 err ? "FAIL" : "Ok");
218
219 return err;
220 }
221
build_id_cache__purge_path(const char * pathname,struct nsinfo * nsi)222 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
223 {
224 struct strlist *list;
225 struct str_node *pos;
226 int err;
227
228 err = build_id_cache__list_build_ids(pathname, nsi, &list);
229 if (err)
230 goto out;
231
232 strlist__for_each_entry(pos, list) {
233 err = build_id_cache__remove_s(pos->s);
234 pr_debug("Removing %s %s: %s\n", pos->s, pathname,
235 err ? "FAIL" : "Ok");
236 if (err)
237 break;
238 }
239 strlist__delete(list);
240
241 out:
242 pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");
243
244 return err;
245 }
246
build_id_cache__purge_all(void)247 static int build_id_cache__purge_all(void)
248 {
249 struct strlist *list;
250 struct str_node *pos;
251 int err = 0;
252 char *buf;
253
254 list = build_id_cache__list_all(false);
255 if (!list) {
256 pr_debug("Failed to get buildids: -%d\n", errno);
257 return -EINVAL;
258 }
259
260 strlist__for_each_entry(pos, list) {
261 buf = build_id_cache__origname(pos->s);
262 err = build_id_cache__remove_s(pos->s);
263 pr_debug("Removing %s (%s): %s\n", buf, pos->s,
264 err ? "FAIL" : "Ok");
265 free(buf);
266 if (err)
267 break;
268 }
269 strlist__delete(list);
270
271 pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
272 return err;
273 }
274
dso__missing_buildid_cache(struct dso * dso,int parm __maybe_unused)275 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
276 {
277 char filename[PATH_MAX];
278 struct build_id bid;
279
280 if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
281 filename__read_build_id(filename, &bid) == -1) {
282 if (errno == ENOENT)
283 return false;
284
285 pr_warning("Problems with %s file, consider removing it from the cache\n",
286 filename);
287 } else if (memcmp(dso->bid.data, bid.data, bid.size)) {
288 pr_warning("Problems with %s file, consider removing it from the cache\n",
289 filename);
290 }
291
292 return true;
293 }
294
build_id_cache__fprintf_missing(struct perf_session * session,FILE * fp)295 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp)
296 {
297 perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
298 return 0;
299 }
300
build_id_cache__update_file(const char * filename,struct nsinfo * nsi)301 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
302 {
303 char sbuild_id[SBUILD_ID_SIZE];
304 struct build_id bid;
305 struct nscookie nsc;
306
307 int err;
308
309 nsinfo__mountns_enter(nsi, &nsc);
310 err = filename__read_build_id(filename, &bid);
311 nsinfo__mountns_exit(&nsc);
312 if (err < 0) {
313 pr_debug("Couldn't read a build-id in %s\n", filename);
314 return -1;
315 }
316 err = 0;
317
318 build_id__sprintf(&bid, sbuild_id);
319 if (build_id_cache__cached(sbuild_id))
320 err = build_id_cache__remove_s(sbuild_id);
321
322 if (!err)
323 err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
324 false);
325
326 pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
327 err ? "FAIL" : "Ok");
328
329 return err;
330 }
331
build_id_cache__show_all(void)332 static int build_id_cache__show_all(void)
333 {
334 struct strlist *bidlist;
335 struct str_node *nd;
336 char *buf;
337
338 bidlist = build_id_cache__list_all(true);
339 if (!bidlist) {
340 pr_debug("Failed to get buildids: -%d\n", errno);
341 return -1;
342 }
343 strlist__for_each_entry(nd, bidlist) {
344 buf = build_id_cache__origname(nd->s);
345 fprintf(stdout, "%s %s\n", nd->s, buf);
346 free(buf);
347 }
348 strlist__delete(bidlist);
349 return 0;
350 }
351
perf_buildid_cache_config(const char * var,const char * value,void * cb)352 static int perf_buildid_cache_config(const char *var, const char *value, void *cb)
353 {
354 struct perf_debuginfod *di = cb;
355
356 if (!strcmp(var, "buildid-cache.debuginfod")) {
357 di->urls = strdup(value);
358 if (!di->urls)
359 return -ENOMEM;
360 di->set = true;
361 }
362
363 return 0;
364 }
365
cmd_buildid_cache(int argc,const char ** argv)366 int cmd_buildid_cache(int argc, const char **argv)
367 {
368 struct strlist *list;
369 struct str_node *pos;
370 int ret, ns_id = -1;
371 bool force = false;
372 bool list_files = false;
373 bool opts_flag = false;
374 bool purge_all = false;
375 char const *add_name_list_str = NULL,
376 *remove_name_list_str = NULL,
377 *purge_name_list_str = NULL,
378 *missing_filename = NULL,
379 *update_name_list_str = NULL,
380 *kcore_filename = NULL;
381 struct perf_debuginfod debuginfod = { };
382 char sbuf[STRERR_BUFSIZE];
383
384 struct perf_data data = {
385 .mode = PERF_DATA_MODE_READ,
386 };
387 struct perf_session *session = NULL;
388 struct nsinfo *nsi = NULL;
389
390 const struct option buildid_cache_options[] = {
391 OPT_STRING('a', "add", &add_name_list_str,
392 "file list", "file(s) to add"),
393 OPT_STRING('k', "kcore", &kcore_filename,
394 "file", "kcore file to add"),
395 OPT_STRING('r', "remove", &remove_name_list_str, "file list",
396 "file(s) to remove"),
397 OPT_STRING('p', "purge", &purge_name_list_str, "file list",
398 "file(s) to remove (remove old caches too)"),
399 OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
400 OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
401 OPT_STRING('M', "missing", &missing_filename, "file",
402 "to find missing build ids in the cache"),
403 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
404 OPT_STRING('u', "update", &update_name_list_str, "file list",
405 "file(s) to update"),
406 OPT_STRING_OPTARG_SET(0, "debuginfod", &debuginfod.urls,
407 &debuginfod.set, "debuginfod urls",
408 "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
409 "system"),
410 OPT_INCR('v', "verbose", &verbose, "be more verbose"),
411 OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
412 OPT_END()
413 };
414 const char * const buildid_cache_usage[] = {
415 "perf buildid-cache [<options>]",
416 NULL
417 };
418
419 ret = perf_config(perf_buildid_cache_config, &debuginfod);
420 if (ret)
421 return ret;
422
423 argc = parse_options(argc, argv, buildid_cache_options,
424 buildid_cache_usage, 0);
425
426 opts_flag = add_name_list_str || kcore_filename ||
427 remove_name_list_str || purge_name_list_str ||
428 missing_filename || update_name_list_str ||
429 purge_all;
430
431 if (argc || !(list_files || opts_flag))
432 usage_with_options(buildid_cache_usage, buildid_cache_options);
433
434 perf_debuginfod_setup(&debuginfod);
435
436 /* -l is exclusive. It can not be used with other options. */
437 if (list_files && opts_flag) {
438 usage_with_options_msg(buildid_cache_usage,
439 buildid_cache_options, "-l is exclusive.\n");
440 }
441
442 if (ns_id > 0)
443 nsi = nsinfo__new(ns_id);
444
445 if (missing_filename) {
446 data.path = missing_filename;
447 data.force = force;
448
449 session = perf_session__new(&data, NULL);
450 if (IS_ERR(session))
451 return PTR_ERR(session);
452 }
453
454 if (symbol__init(session ? &session->header.env : NULL) < 0)
455 goto out;
456
457 setup_pager();
458
459 if (list_files) {
460 ret = build_id_cache__show_all();
461 goto out;
462 }
463
464 if (add_name_list_str) {
465 list = strlist__new(add_name_list_str, NULL);
466 if (list) {
467 strlist__for_each_entry(pos, list)
468 if (build_id_cache__add_file(pos->s, nsi)) {
469 if (errno == EEXIST) {
470 pr_debug("%s already in the cache\n",
471 pos->s);
472 continue;
473 }
474 pr_warning("Couldn't add %s: %s\n",
475 pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
476 }
477
478 strlist__delete(list);
479 }
480 }
481
482 if (remove_name_list_str) {
483 list = strlist__new(remove_name_list_str, NULL);
484 if (list) {
485 strlist__for_each_entry(pos, list)
486 if (build_id_cache__remove_file(pos->s, nsi)) {
487 if (errno == ENOENT) {
488 pr_debug("%s wasn't in the cache\n",
489 pos->s);
490 continue;
491 }
492 pr_warning("Couldn't remove %s: %s\n",
493 pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
494 }
495
496 strlist__delete(list);
497 }
498 }
499
500 if (purge_name_list_str) {
501 list = strlist__new(purge_name_list_str, NULL);
502 if (list) {
503 strlist__for_each_entry(pos, list)
504 if (build_id_cache__purge_path(pos->s, nsi)) {
505 if (errno == ENOENT) {
506 pr_debug("%s wasn't in the cache\n",
507 pos->s);
508 continue;
509 }
510 pr_warning("Couldn't remove %s: %s\n",
511 pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
512 }
513
514 strlist__delete(list);
515 }
516 }
517
518 if (purge_all) {
519 if (build_id_cache__purge_all()) {
520 pr_warning("Couldn't remove some caches. Error: %s.\n",
521 str_error_r(errno, sbuf, sizeof(sbuf)));
522 }
523 }
524
525 if (missing_filename)
526 ret = build_id_cache__fprintf_missing(session, stdout);
527
528 if (update_name_list_str) {
529 list = strlist__new(update_name_list_str, NULL);
530 if (list) {
531 strlist__for_each_entry(pos, list)
532 if (build_id_cache__update_file(pos->s, nsi)) {
533 if (errno == ENOENT) {
534 pr_debug("%s wasn't in the cache\n",
535 pos->s);
536 continue;
537 }
538 pr_warning("Couldn't update %s: %s\n",
539 pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
540 }
541
542 strlist__delete(list);
543 }
544 }
545
546 if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
547 pr_warning("Couldn't add %s\n", kcore_filename);
548
549 out:
550 perf_session__delete(session);
551 nsinfo__zput(nsi);
552
553 return ret;
554 }
555