tools/perf/builtin-buildid-cache.c - linux/kernel/git/paulmck/linux-rcu - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * builtin-buildid-cache.c
  *
  * Builtin buildid-cache command: Manages build-id cache
  *
  * Copyright (C) 2010, Red Hat Inc.
  * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
  */
 #include <sys/types.h>
 #include <sys/time.h>
 #include <time.h>
 #include <dirent.h>
 #include <errno.h>
 #include <unistd.h>
 #include "builtin.h"
 #include "namespaces.h"
 #include "util/debug.h"
 #include "util/header.h"
 #include <subcmd/pager.h>
 #include <subcmd/parse-options.h>
 #include "util/strlist.h"
 #include "util/build-id.h"
 #include "util/session.h"
 #include "util/dso.h"
 #include "util/symbol.h"
 #include "util/time-utils.h"
 #include "util/util.h"
 #include "util/probe-file.h"
 #include "util/config.h"
 #include <linux/string.h>
 #include <linux/err.h>

 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
 {
 	char root_dir[PATH_MAX];
 	char *p;

 	strlcpy(root_dir, proc_dir, sizeof(root_dir));

 	p = strrchr(root_dir, '/');
 	if (!p)
 		return -1;
 	*p = '\0';
 	return sysfs__sprintf_build_id(root_dir, sbuildid);
 }

 static int build_id_cache__kcore_dir(char *dir, size_t sz)
 {
 	return fetch_current_timestamp(dir, sz);
 }

 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)
 {
 	char from[PATH_MAX];
 	char to[PATH_MAX];
 	const char *name;
 	u64 addr1 = 0, addr2 = 0;
 	int i, err = -1;

 	scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
 	scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);

 	for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 		err = kallsyms__get_function_start(from, name, &addr1);
 		if (!err)
 			break;
 	}

 	if (err)
 		return false;

 	if (kallsyms__get_function_start(to, name, &addr2))
 		return false;

 	return addr1 == addr2;
 }

 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir,
 					  size_t to_dir_sz)
 {
 	char from[PATH_MAX];
 	char to[PATH_MAX];
 	char to_subdir[PATH_MAX];
 	struct dirent *dent;
 	int ret = -1;
 	DIR *d;

 	d = opendir(to_dir);
 	if (!d)
 		return -1;

 	scnprintf(from, sizeof(from), "%s/modules", from_dir);

 	while (1) {
 		dent = readdir(d);
 		if (!dent)
 			break;
 		if (dent->d_type != DT_DIR)
 			continue;
 		scnprintf(to, sizeof(to), "%s/%s/modules", to_dir,
 			  dent->d_name);
 		scnprintf(to_subdir, sizeof(to_subdir), "%s/%s",
 			  to_dir, dent->d_name);
 		if (!compare_proc_modules(from, to) &&
 		    same_kallsyms_reloc(from_dir, to_subdir)) {
 			strlcpy(to_dir, to_subdir, to_dir_sz);
 			ret = 0;
 			break;
 		}
 	}

 	closedir(d);

 	return ret;
 }

 static int build_id_cache__add_kcore(const char *filename, bool force)
 {
 	char dir[32], sbuildid[SBUILD_ID_SIZE];
 	char from_dir[PATH_MAX], to_dir[PATH_MAX];
 	char *p;

 	strlcpy(from_dir, filename, sizeof(from_dir));

 	p = strrchr(from_dir, '/');
 	if (!p || strcmp(p + 1, "kcore"))
 		return -1;
 	*p = '\0';

 	if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
 		return -1;

 	scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
 		  buildid_dir, DSO__NAME_KCORE, sbuildid);

 	if (!force &&
 	    !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
 		pr_debug("same kcore found in %s\n", to_dir);
 		return 0;
 	}

 	if (build_id_cache__kcore_dir(dir, sizeof(dir)))
 		return -1;

 	scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
 		  buildid_dir, DSO__NAME_KCORE, sbuildid, dir);

 	if (mkdir_p(to_dir, 0755))
 		return -1;

 	if (kcore_copy(from_dir, to_dir)) {
 		/* Remove YYYYmmddHHMMSShh directory */
 		if (!rmdir(to_dir)) {
 			p = strrchr(to_dir, '/');
 			if (p)
 				*p = '\0';
 			/* Try to remove buildid directory */
 			if (!rmdir(to_dir)) {
 				p = strrchr(to_dir, '/');
 				if (p)
 					*p = '\0';
 				/* Try to remove [kernel.kcore] directory */
 				rmdir(to_dir);
 			}
 		}
 		return -1;
 	}

 	pr_debug("kcore added to build-id cache directory %s\n", to_dir);

 	return 0;
 }

 static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
 {
 	char sbuild_id[SBUILD_ID_SIZE];
 	struct build_id bid;
 	int err;
 	struct nscookie nsc;

 	nsinfo__mountns_enter(nsi, &nsc);
 	err = filename__read_build_id(filename, &bid);
 	nsinfo__mountns_exit(&nsc);
 	if (err < 0) {
 		pr_debug("Couldn't read a build-id in %s\n", filename);
 		return -1;
 	}

 	build_id__sprintf(&bid, sbuild_id);
 	err = build_id_cache__add_s(sbuild_id, filename, nsi,
 				    false, false);
 	pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
 		 err ? "FAIL" : "Ok");
 	return err;
 }

 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
 {
 	char sbuild_id[SBUILD_ID_SIZE];
 	struct build_id bid;
 	struct nscookie nsc;

 	int err;

 	nsinfo__mountns_enter(nsi, &nsc);
 	err = filename__read_build_id(filename, &bid);
 	nsinfo__mountns_exit(&nsc);
 	if (err < 0) {
 		pr_debug("Couldn't read a build-id in %s\n", filename);
 		return -1;
 	}

 	build_id__sprintf(&bid, sbuild_id);
 	err = build_id_cache__remove_s(sbuild_id);
 	pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
 		 err ? "FAIL" : "Ok");

 	return err;
 }

 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
 {
 	struct strlist *list;
 	struct str_node *pos;
 	int err;

 	err = build_id_cache__list_build_ids(pathname, nsi, &list);
 	if (err)
 		goto out;

 	strlist__for_each_entry(pos, list) {
 		err = build_id_cache__remove_s(pos->s);
 		pr_debug("Removing %s %s: %s\n", pos->s, pathname,
 			 err ? "FAIL" : "Ok");
 		if (err)
 			break;
 	}
 	strlist__delete(list);

 out:
 	pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");

 	return err;
 }

 static int build_id_cache__purge_all(void)
 {
 	struct strlist *list;
 	struct str_node *pos;
 	int err = 0;
 	char *buf;

 	list = build_id_cache__list_all(false);
 	if (!list) {
 		pr_debug("Failed to get buildids: -%d\n", errno);
 		return -EINVAL;
 	}

 	strlist__for_each_entry(pos, list) {
 		buf = build_id_cache__origname(pos->s);
 		err = build_id_cache__remove_s(pos->s);
 		pr_debug("Removing %s (%s): %s\n", buf, pos->s,
 			 err ? "FAIL" : "Ok");
 		free(buf);
 		if (err)
 			break;
 	}
 	strlist__delete(list);

 	pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
 	return err;
 }

 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
 {
 	char filename[PATH_MAX];
 	struct build_id bid;

 	if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
 	    filename__read_build_id(filename, &bid) == -1) {
 		if (errno == ENOENT)
 			return false;

 		pr_warning("Problems with %s file, consider removing it from the cache\n",
 			   filename);
 	} else if (memcmp(dso->bid.data, bid.data, bid.size)) {
 		pr_warning("Problems with %s file, consider removing it from the cache\n",
 			   filename);
 	}

 	return true;
 }

 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp)
 {
 	perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
 	return 0;
 }

 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
 {
 	char sbuild_id[SBUILD_ID_SIZE];
 	struct build_id bid;
 	struct nscookie nsc;

 	int err;

 	nsinfo__mountns_enter(nsi, &nsc);
 	err = filename__read_build_id(filename, &bid);
 	nsinfo__mountns_exit(&nsc);
 	if (err < 0) {
 		pr_debug("Couldn't read a build-id in %s\n", filename);
 		return -1;
 	}
 	err = 0;

 	build_id__sprintf(&bid, sbuild_id);
 	if (build_id_cache__cached(sbuild_id))
 		err = build_id_cache__remove_s(sbuild_id);

 	if (!err)
 		err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
 					    false);

 	pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
 		 err ? "FAIL" : "Ok");

 	return err;
 }

 static int build_id_cache__show_all(void)
 {
 	struct strlist *bidlist;
 	struct str_node *nd;
 	char *buf;

 	bidlist = build_id_cache__list_all(true);
 	if (!bidlist) {
 		pr_debug("Failed to get buildids: -%d\n", errno);
 		return -1;
 	}
 	strlist__for_each_entry(nd, bidlist) {
 		buf = build_id_cache__origname(nd->s);
 		fprintf(stdout, "%s %s\n", nd->s, buf);
 		free(buf);
 	}
 	strlist__delete(bidlist);
 	return 0;
 }

 static int perf_buildid_cache_config(const char *var, const char *value, void *cb)
 {
 	struct perf_debuginfod *di = cb;

 	if (!strcmp(var, "buildid-cache.debuginfod")) {
 		di->urls = strdup(value);
 		if (!di->urls)
 			return -ENOMEM;
 		di->set = true;
 	}

 	return 0;
 }

 int cmd_buildid_cache(int argc, const char **argv)
 {
 	struct strlist *list;
 	struct str_node *pos;
 	int ret, ns_id = -1;
 	bool force = false;
 	bool list_files = false;
 	bool opts_flag = false;
 	bool purge_all = false;
 	char const *add_name_list_str = NULL,
 		   *remove_name_list_str = NULL,
 		   *purge_name_list_str = NULL,
 		   *missing_filename = NULL,
 		   *update_name_list_str = NULL,
 		   *kcore_filename = NULL;
 	struct perf_debuginfod debuginfod = { };
 	char sbuf[STRERR_BUFSIZE];

 	struct perf_data data = {
 		.mode  = PERF_DATA_MODE_READ,
 	};
 	struct perf_session *session = NULL;
 	struct nsinfo *nsi = NULL;

 	const struct option buildid_cache_options[] = {
 	OPT_STRING('a', "add", &add_name_list_str,
 		   "file list", "file(s) to add"),
 	OPT_STRING('k', "kcore", &kcore_filename,
 		   "file", "kcore file to add"),
 	OPT_STRING('r', "remove", &remove_name_list_str, "file list",
 		    "file(s) to remove"),
 	OPT_STRING('p', "purge", &purge_name_list_str, "file list",
 		    "file(s) to remove (remove old caches too)"),
 	OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
 	OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
 	OPT_STRING('M', "missing", &missing_filename, "file",
 		   "to find missing build ids in the cache"),
 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 	OPT_STRING('u', "update", &update_name_list_str, "file list",
 		    "file(s) to update"),
 	OPT_STRING_OPTARG_SET(0, "debuginfod", &debuginfod.urls,
 			&debuginfod.set, "debuginfod urls",
 			"Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
 			"system"),
 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
 	OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
 	OPT_END()
 	};
 	const char * const buildid_cache_usage[] = {
 		"perf buildid-cache [<options>]",
 		NULL
 	};

 	ret = perf_config(perf_buildid_cache_config, &debuginfod);
 	if (ret)
 		return ret;

 	argc = parse_options(argc, argv, buildid_cache_options,
 			     buildid_cache_usage, 0);

 	opts_flag = add_name_list_str || kcore_filename ||
 		remove_name_list_str || purge_name_list_str ||
 		missing_filename || update_name_list_str ||
 		purge_all;

 	if (argc || !(list_files || opts_flag))
 		usage_with_options(buildid_cache_usage, buildid_cache_options);

 	perf_debuginfod_setup(&debuginfod);

 	/* -l is exclusive. It can not be used with other options. */
 	if (list_files && opts_flag) {
 		usage_with_options_msg(buildid_cache_usage,
 			buildid_cache_options, "-l is exclusive.\n");
 	}

 	if (ns_id > 0)
 		nsi = nsinfo__new(ns_id);

 	if (missing_filename) {
 		data.path  = missing_filename;
 		data.force = force;

 		session = perf_session__new(&data, NULL);
 		if (IS_ERR(session))
 			return PTR_ERR(session);
 	}

 	if (symbol__init(session ? &session->header.env : NULL) < 0)
 		goto out;

 	setup_pager();

 	if (list_files) {
 		ret = build_id_cache__show_all();
 		goto out;
 	}

 	if (add_name_list_str) {
 		list = strlist__new(add_name_list_str, NULL);
 		if (list) {
 			strlist__for_each_entry(pos, list)
 				if (build_id_cache__add_file(pos->s, nsi)) {
 					if (errno == EEXIST) {
 						pr_debug("%s already in the cache\n",
 							 pos->s);
 						continue;
 					}
 					pr_warning("Couldn't add %s: %s\n",
 						   pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 				}

 			strlist__delete(list);
 		}
 	}

 	if (remove_name_list_str) {
 		list = strlist__new(remove_name_list_str, NULL);
 		if (list) {
 			strlist__for_each_entry(pos, list)
 				if (build_id_cache__remove_file(pos->s, nsi)) {
 					if (errno == ENOENT) {
 						pr_debug("%s wasn't in the cache\n",
 							 pos->s);
 						continue;
 					}
 					pr_warning("Couldn't remove %s: %s\n",
 						   pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 				}

 			strlist__delete(list);
 		}
 	}

 	if (purge_name_list_str) {
 		list = strlist__new(purge_name_list_str, NULL);
 		if (list) {
 			strlist__for_each_entry(pos, list)
 				if (build_id_cache__purge_path(pos->s, nsi)) {
 					if (errno == ENOENT) {
 						pr_debug("%s wasn't in the cache\n",
 							 pos->s);
 						continue;
 					}
 					pr_warning("Couldn't remove %s: %s\n",
 						   pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 				}

 			strlist__delete(list);
 		}
 	}

 	if (purge_all) {
 		if (build_id_cache__purge_all()) {
 			pr_warning("Couldn't remove some caches. Error: %s.\n",
 				str_error_r(errno, sbuf, sizeof(sbuf)));
 		}
 	}

 	if (missing_filename)
 		ret = build_id_cache__fprintf_missing(session, stdout);

 	if (update_name_list_str) {
 		list = strlist__new(update_name_list_str, NULL);
 		if (list) {
 			strlist__for_each_entry(pos, list)
 				if (build_id_cache__update_file(pos->s, nsi)) {
 					if (errno == ENOENT) {
 						pr_debug("%s wasn't in the cache\n",
 							 pos->s);
 						continue;
 					}
 					pr_warning("Couldn't update %s: %s\n",
 						   pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 				}

 			strlist__delete(list);
 		}
 	}

 	if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
 		pr_warning("Couldn't add %s\n", kcore_filename);

 out:
 	perf_session__delete(session);
 	nsinfo__zput(nsi);

 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* builtin-buildid-cache.c
	*
	* Builtin buildid-cache command: Manages build-id cache
	*
	* Copyright (C) 2010, Red Hat Inc.
	* Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
	*/
	#include <sys/types.h>
	#include <sys/time.h>
	#include <time.h>
	#include <dirent.h>
	#include <errno.h>
	#include <unistd.h>
	#include "builtin.h"
	#include "namespaces.h"
	#include "util/debug.h"
	#include "util/header.h"
	#include <subcmd/pager.h>
	#include <subcmd/parse-options.h>
	#include "util/strlist.h"
	#include "util/build-id.h"
	#include "util/session.h"
	#include "util/dso.h"
	#include "util/symbol.h"
	#include "util/time-utils.h"
	#include "util/util.h"
	#include "util/probe-file.h"
	#include "util/config.h"
	#include <linux/string.h>
	#include <linux/err.h>

	static int build_id_cache__kcore_buildid(const char proc_dir, char sbuildid)
	{
	char root_dir[PATH_MAX];
	char *p;

	strlcpy(root_dir, proc_dir, sizeof(root_dir));

	p = strrchr(root_dir, '/');
	if (!p)
	return -1;
	*p = '\0';
	return sysfs__sprintf_build_id(root_dir, sbuildid);
	}

	static int build_id_cache__kcore_dir(char *dir, size_t sz)
	{
	return fetch_current_timestamp(dir, sz);
	}

	static bool same_kallsyms_reloc(const char from_dir, char to_dir)
	{
	char from[PATH_MAX];
	char to[PATH_MAX];
	const char *name;
	u64 addr1 = 0, addr2 = 0;
	int i, err = -1;

	scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
	scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);

	for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
	err = kallsyms__get_function_start(from, name, &addr1);
	if (!err)
	break;
	}

	if (err)
	return false;

	if (kallsyms__get_function_start(to, name, &addr2))
	return false;

	return addr1 == addr2;
	}

	static int build_id_cache__kcore_existing(const char from_dir, char to_dir,
	size_t to_dir_sz)
	{
	char from[PATH_MAX];
	char to[PATH_MAX];
	char to_subdir[PATH_MAX];
	struct dirent *dent;
	int ret = -1;
	DIR *d;

	d = opendir(to_dir);
	if (!d)
	return -1;

	scnprintf(from, sizeof(from), "%s/modules", from_dir);

	while (1) {
	dent = readdir(d);
	if (!dent)
	break;
	if (dent->d_type != DT_DIR)
	continue;
	scnprintf(to, sizeof(to), "%s/%s/modules", to_dir,
	dent->d_name);
	scnprintf(to_subdir, sizeof(to_subdir), "%s/%s",
	to_dir, dent->d_name);
	if (!compare_proc_modules(from, to) &&
	same_kallsyms_reloc(from_dir, to_subdir)) {
	strlcpy(to_dir, to_subdir, to_dir_sz);
	ret = 0;
	break;
	}
	}

	closedir(d);

	return ret;
	}

	static int build_id_cache__add_kcore(const char *filename, bool force)
	{
	char dir[32], sbuildid[SBUILD_ID_SIZE];
	char from_dir[PATH_MAX], to_dir[PATH_MAX];
	char *p;

	strlcpy(from_dir, filename, sizeof(from_dir));

	p = strrchr(from_dir, '/');
	if (!p \|\| strcmp(p + 1, "kcore"))
	return -1;
	*p = '\0';

	if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
	return -1;

	scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
	buildid_dir, DSO__NAME_KCORE, sbuildid);

	if (!force &&
	!build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
	pr_debug("same kcore found in %s\n", to_dir);
	return 0;
	}

	if (build_id_cache__kcore_dir(dir, sizeof(dir)))
	return -1;

	scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
	buildid_dir, DSO__NAME_KCORE, sbuildid, dir);

	if (mkdir_p(to_dir, 0755))
	return -1;

	if (kcore_copy(from_dir, to_dir)) {
	/* Remove YYYYmmddHHMMSShh directory */
	if (!rmdir(to_dir)) {
	p = strrchr(to_dir, '/');
	if (p)
	*p = '\0';
	/* Try to remove buildid directory */
	if (!rmdir(to_dir)) {
	p = strrchr(to_dir, '/');
	if (p)
	*p = '\0';
	/* Try to remove [kernel.kcore] directory */
	rmdir(to_dir);
	}
	}
	return -1;
	}

	pr_debug("kcore added to build-id cache directory %s\n", to_dir);

	return 0;
	}

	static int build_id_cache__add_file(const char filename, struct nsinfo nsi)
	{
	char sbuild_id[SBUILD_ID_SIZE];
	struct build_id bid;
	int err;
	struct nscookie nsc;

	nsinfo__mountns_enter(nsi, &nsc);
	err = filename__read_build_id(filename, &bid);
	nsinfo__mountns_exit(&nsc);
	if (err < 0) {
	pr_debug("Couldn't read a build-id in %s\n", filename);
	return -1;
	}

	build_id__sprintf(&bid, sbuild_id);
	err = build_id_cache__add_s(sbuild_id, filename, nsi,
	false, false);
	pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
	err ? "FAIL" : "Ok");
	return err;
	}

	static int build_id_cache__remove_file(const char filename, struct nsinfo nsi)
	{
	char sbuild_id[SBUILD_ID_SIZE];
	struct build_id bid;
	struct nscookie nsc;

	int err;

	nsinfo__mountns_enter(nsi, &nsc);
	err = filename__read_build_id(filename, &bid);
	nsinfo__mountns_exit(&nsc);
	if (err < 0) {
	pr_debug("Couldn't read a build-id in %s\n", filename);
	return -1;
	}

	build_id__sprintf(&bid, sbuild_id);
	err = build_id_cache__remove_s(sbuild_id);
	pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
	err ? "FAIL" : "Ok");

	return err;
	}

	static int build_id_cache__purge_path(const char pathname, struct nsinfo nsi)
	{
	struct strlist *list;
	struct str_node *pos;
	int err;

	err = build_id_cache__list_build_ids(pathname, nsi, &list);
	if (err)
	goto out;

	strlist__for_each_entry(pos, list) {
	err = build_id_cache__remove_s(pos->s);
	pr_debug("Removing %s %s: %s\n", pos->s, pathname,
	err ? "FAIL" : "Ok");
	if (err)
	break;
	}
	strlist__delete(list);

	out:
	pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");

	return err;
	}

	static int build_id_cache__purge_all(void)
	{
	struct strlist *list;
	struct str_node *pos;
	int err = 0;
	char *buf;

	list = build_id_cache__list_all(false);
	if (!list) {
	pr_debug("Failed to get buildids: -%d\n", errno);
	return -EINVAL;
	}

	strlist__for_each_entry(pos, list) {
	buf = build_id_cache__origname(pos->s);
	err = build_id_cache__remove_s(pos->s);
	pr_debug("Removing %s (%s): %s\n", buf, pos->s,
	err ? "FAIL" : "Ok");
	free(buf);
	if (err)
	break;
	}
	strlist__delete(list);

	pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
	return err;
	}

	static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
	{
	char filename[PATH_MAX];
	struct build_id bid;

	if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
	filename__read_build_id(filename, &bid) == -1) {
	if (errno == ENOENT)
	return false;

	pr_warning("Problems with %s file, consider removing it from the cache\n",
	filename);
	} else if (memcmp(dso->bid.data, bid.data, bid.size)) {
	pr_warning("Problems with %s file, consider removing it from the cache\n",
	filename);
	}

	return true;
	}

	static int build_id_cache__fprintf_missing(struct perf_session session, FILE fp)
	{
	perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
	return 0;
	}

	static int build_id_cache__update_file(const char filename, struct nsinfo nsi)
	{
	char sbuild_id[SBUILD_ID_SIZE];
	struct build_id bid;
	struct nscookie nsc;

	int err;

	nsinfo__mountns_enter(nsi, &nsc);
	err = filename__read_build_id(filename, &bid);
	nsinfo__mountns_exit(&nsc);
	if (err < 0) {
	pr_debug("Couldn't read a build-id in %s\n", filename);
	return -1;
	}
	err = 0;

	build_id__sprintf(&bid, sbuild_id);
	if (build_id_cache__cached(sbuild_id))
	err = build_id_cache__remove_s(sbuild_id);

	if (!err)
	err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
	false);

	pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
	err ? "FAIL" : "Ok");

	return err;
	}

	static int build_id_cache__show_all(void)
	{
	struct strlist *bidlist;
	struct str_node *nd;
	char *buf;

	bidlist = build_id_cache__list_all(true);
	if (!bidlist) {
	pr_debug("Failed to get buildids: -%d\n", errno);
	return -1;
	}
	strlist__for_each_entry(nd, bidlist) {
	buf = build_id_cache__origname(nd->s);
	fprintf(stdout, "%s %s\n", nd->s, buf);
	free(buf);
	}
	strlist__delete(bidlist);
	return 0;
	}

	static int perf_buildid_cache_config(const char var, const char value, void *cb)
	{
	struct perf_debuginfod *di = cb;

	if (!strcmp(var, "buildid-cache.debuginfod")) {
	di->urls = strdup(value);
	if (!di->urls)
	return -ENOMEM;
	di->set = true;
	}

	return 0;
	}

	int cmd_buildid_cache(int argc, const char **argv)
	{
	struct strlist *list;
	struct str_node *pos;
	int ret, ns_id = -1;
	bool force = false;
	bool list_files = false;
	bool opts_flag = false;
	bool purge_all = false;
	char const *add_name_list_str = NULL,
	*remove_name_list_str = NULL,
	*purge_name_list_str = NULL,
	*missing_filename = NULL,
	*update_name_list_str = NULL,
	*kcore_filename = NULL;
	struct perf_debuginfod debuginfod = { };
	char sbuf[STRERR_BUFSIZE];

	struct perf_data data = {
	.mode = PERF_DATA_MODE_READ,
	};
	struct perf_session *session = NULL;
	struct nsinfo *nsi = NULL;

	const struct option buildid_cache_options[] = {
	OPT_STRING('a', "add", &add_name_list_str,
	"file list", "file(s) to add"),
	OPT_STRING('k', "kcore", &kcore_filename,
	"file", "kcore file to add"),
	OPT_STRING('r', "remove", &remove_name_list_str, "file list",
	"file(s) to remove"),
	OPT_STRING('p', "purge", &purge_name_list_str, "file list",
	"file(s) to remove (remove old caches too)"),
	OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
	OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
	OPT_STRING('M', "missing", &missing_filename, "file",
	"to find missing build ids in the cache"),
	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
	OPT_STRING('u', "update", &update_name_list_str, "file list",
	"file(s) to update"),
	OPT_STRING_OPTARG_SET(0, "debuginfod", &debuginfod.urls,
	&debuginfod.set, "debuginfod urls",
	"Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
	"system"),
	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
	OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
	OPT_END()
	};
	const char * const buildid_cache_usage[] = {
	"perf buildid-cache [<options>]",
	NULL
	};

	ret = perf_config(perf_buildid_cache_config, &debuginfod);
	if (ret)
	return ret;

	argc = parse_options(argc, argv, buildid_cache_options,
	buildid_cache_usage, 0);

	opts_flag = add_name_list_str \|\| kcore_filename \|\|
	remove_name_list_str \|\| purge_name_list_str \|\|
	missing_filename \|\| update_name_list_str \|\|
	purge_all;

	if (argc \|\| !(list_files \|\| opts_flag))
	usage_with_options(buildid_cache_usage, buildid_cache_options);

	perf_debuginfod_setup(&debuginfod);

	/* -l is exclusive. It can not be used with other options. */
	if (list_files && opts_flag) {
	usage_with_options_msg(buildid_cache_usage,
	buildid_cache_options, "-l is exclusive.\n");
	}

	if (ns_id > 0)
	nsi = nsinfo__new(ns_id);

	if (missing_filename) {
	data.path = missing_filename;
	data.force = force;

	session = perf_session__new(&data, NULL);
	if (IS_ERR(session))
	return PTR_ERR(session);
	}

	if (symbol__init(session ? &session->header.env : NULL) < 0)
	goto out;

	setup_pager();

	if (list_files) {
	ret = build_id_cache__show_all();
	goto out;
	}

	if (add_name_list_str) {
	list = strlist__new(add_name_list_str, NULL);
	if (list) {
	strlist__for_each_entry(pos, list)
	if (build_id_cache__add_file(pos->s, nsi)) {
	if (errno == EEXIST) {
	pr_debug("%s already in the cache\n",
	pos->s);
	continue;
	}
	pr_warning("Couldn't add %s: %s\n",
	pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
	}

	strlist__delete(list);
	}
	}

	if (remove_name_list_str) {
	list = strlist__new(remove_name_list_str, NULL);
	if (list) {
	strlist__for_each_entry(pos, list)
	if (build_id_cache__remove_file(pos->s, nsi)) {
	if (errno == ENOENT) {
	pr_debug("%s wasn't in the cache\n",
	pos->s);
	continue;
	}
	pr_warning("Couldn't remove %s: %s\n",
	pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
	}

	strlist__delete(list);
	}
	}

	if (purge_name_list_str) {
	list = strlist__new(purge_name_list_str, NULL);
	if (list) {
	strlist__for_each_entry(pos, list)
	if (build_id_cache__purge_path(pos->s, nsi)) {
	if (errno == ENOENT) {
	pr_debug("%s wasn't in the cache\n",
	pos->s);
	continue;
	}
	pr_warning("Couldn't remove %s: %s\n",
	pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
	}

	strlist__delete(list);
	}
	}

	if (purge_all) {
	if (build_id_cache__purge_all()) {
	pr_warning("Couldn't remove some caches. Error: %s.\n",
	str_error_r(errno, sbuf, sizeof(sbuf)));
	}
	}

	if (missing_filename)
	ret = build_id_cache__fprintf_missing(session, stdout);

	if (update_name_list_str) {
	list = strlist__new(update_name_list_str, NULL);
	if (list) {
	strlist__for_each_entry(pos, list)
	if (build_id_cache__update_file(pos->s, nsi)) {
	if (errno == ENOENT) {
	pr_debug("%s wasn't in the cache\n",
	pos->s);
	continue;
	}
	pr_warning("Couldn't update %s: %s\n",
	pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
	}

	strlist__delete(list);
	}
	}

	if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
	pr_warning("Couldn't add %s\n", kcore_filename);

	out:
	perf_session__delete(session);
	nsinfo__zput(nsi);

	return ret;
	}