1// SPDX-License-Identifier: GPL-2.0
2/*
3 * builtin-config.c
4 *
5 * Copyright (C) 2015, Taeung Song <treeze.taeung@gmail.com>
6 *
7 */
8#include "builtin.h"
9
10#include "util/cache.h"
11#include <subcmd/parse-options.h>
12#include "util/debug.h"
13#include "util/config.h"
14#include <linux/string.h>
15#include <limits.h>
16#include <stdio.h>
17#include <stdlib.h>
18
19static bool use_system_config, use_user_config;
20
21static const char * const config_usage[] = {
22 "perf config [<file-option>] [options] [section.name[=value] ...]",
23 NULL
24};
25
26enum actions {
27 ACTION_LIST = 1
28} actions;
29
30static struct option config_options[] = {
31 OPT_SET_UINT('l', "list", &actions,
32 "show current config variables", ACTION_LIST),
33 OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
34 OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
35 OPT_END()
36};
37
38static int set_config(struct perf_config_set *set, const char *file_name)
39{
40 struct perf_config_section *section = NULL;
41 struct perf_config_item *item = NULL;
42 const char *first_line = "# this file is auto-generated.";
43 FILE *fp;
44
45 if (set == NULL)
46 return -1;
47
48 fp = fopen(file_name, "w");
49 if (!fp)
50 return -1;
51
52 fprintf(fp, "%s\n", first_line);
53
54 /* overwrite configvariables */
55 perf_config_items__for_each_entry(&set->sections, section) {
56 if (!use_system_config && section->from_system_config)
57 continue;
58 fprintf(fp, "[%s]\n", section->name);
59
60 perf_config_items__for_each_entry(&section->items, item) {
61 if (!use_system_config && item->from_system_config)
62 continue;
63 if (item->value)
64 fprintf(fp, "\t%s = %s\n",
65 item->name, item->value);
66 }
67 }
68 fclose(fp);
69
70 return 0;
71}
72
73static int show_spec_config(struct perf_config_set *set, const char *var)
74{
75 struct perf_config_section *section;
76 struct perf_config_item *item;
77
78 if (set == NULL)
79 return -1;
80
81 perf_config_items__for_each_entry(&set->sections, section) {
82 if (!strstarts(str: var, prefix: section->name))
83 continue;
84
85 perf_config_items__for_each_entry(&section->items, item) {
86 const char *name = var + strlen(section->name) + 1;
87
88 if (strcmp(name, item->name) == 0) {
89 char *value = item->value;
90
91 if (value) {
92 printf("%s=%s\n", var, value);
93 return 0;
94 }
95 }
96
97 }
98 }
99
100 return 0;
101}
102
103static int show_config(struct perf_config_set *set)
104{
105 struct perf_config_section *section;
106 struct perf_config_item *item;
107
108 if (set == NULL)
109 return -1;
110
111 perf_config_set__for_each_entry(set, section, item) {
112 char *value = item->value;
113
114 if (value)
115 printf("%s.%s=%s\n", section->name,
116 item->name, value);
117 }
118
119 return 0;
120}
121
122static int parse_config_arg(char *arg, char **var, char **value)
123{
124 const char *last_dot = strchr(arg, '.');
125
126 /*
127 * Since "var" actually contains the section name and the real
128 * config variable name separated by a dot, we have to know where the dot is.
129 */
130 if (last_dot == NULL || last_dot == arg) {
131 pr_err("The config variable does not contain a section name: %s\n", arg);
132 return -1;
133 }
134 if (!last_dot[1]) {
135 pr_err("The config variable does not contain a variable name: %s\n", arg);
136 return -1;
137 }
138
139 *value = strchr(arg, '=');
140 if (*value == NULL)
141 *var = arg;
142 else if (!strcmp(*value, "=")) {
143 pr_err("The config variable does not contain a value: %s\n", arg);
144 return -1;
145 } else {
146 *value = *value + 1; /* excluding a first character '=' */
147 *var = strsep(&arg, "=");
148 if (*var[0] == '\0') {
149 pr_err("invalid config variable: %s\n", arg);
150 return -1;
151 }
152 }
153
154 return 0;
155}
156
157int perf_config__set_variable(const char *var, const char *value)
158{
159 char path[PATH_MAX];
160 char *user_config = mkpath(path_buf: path, sz: sizeof(path), fmt: "%s/.perfconfig", getenv("HOME"));
161 const char *config_filename;
162 struct perf_config_set *set;
163 int ret = -1;
164
165 if (use_system_config)
166 config_exclusive_filename = perf_etc_perfconfig();
167 else if (use_user_config)
168 config_exclusive_filename = user_config;
169
170 if (!config_exclusive_filename)
171 config_filename = user_config;
172 else
173 config_filename = config_exclusive_filename;
174
175 set = perf_config_set__new();
176 if (!set)
177 goto out_err;
178
179 if (perf_config_set__collect(set, file_name: config_filename, var, value) < 0) {
180 pr_err("Failed to add '%s=%s'\n", var, value);
181 goto out_err;
182 }
183
184 if (set_config(set, file_name: config_filename) < 0) {
185 pr_err("Failed to set the configs on %s\n", config_filename);
186 goto out_err;
187 }
188
189 ret = 0;
190out_err:
191 perf_config_set__delete(set);
192 return ret;
193}
194
195int cmd_config(int argc, const char **argv)
196{
197 int i, ret = -1;
198 struct perf_config_set *set;
199 char path[PATH_MAX];
200 char *user_config = mkpath(path_buf: path, sz: sizeof(path), fmt: "%s/.perfconfig", getenv("HOME"));
201 const char *config_filename;
202 bool changed = false;
203
204 argc = parse_options(argc, argv, config_options, config_usage,
205 PARSE_OPT_STOP_AT_NON_OPTION);
206
207 if (use_system_config && use_user_config) {
208 pr_err("Error: only one config file at a time\n");
209 parse_options_usage(config_usage, config_options, "user", 0);
210 parse_options_usage(NULL, config_options, "system", 0);
211 return -1;
212 }
213
214 if (use_system_config)
215 config_exclusive_filename = perf_etc_perfconfig();
216 else if (use_user_config)
217 config_exclusive_filename = user_config;
218
219 if (!config_exclusive_filename)
220 config_filename = user_config;
221 else
222 config_filename = config_exclusive_filename;
223
224 /*
225 * At only 'config' sub-command, individually use the config set
226 * because of reinitializing with options config file location.
227 */
228 set = perf_config_set__new();
229 if (!set)
230 goto out_err;
231
232 switch (actions) {
233 case ACTION_LIST:
234 if (argc) {
235 pr_err("Error: takes no arguments\n");
236 parse_options_usage(config_usage, config_options, "l", 1);
237 } else {
238do_action_list:
239 if (show_config(set) < 0) {
240 pr_err("Nothing configured, "
241 "please check your %s \n", config_filename);
242 goto out_err;
243 }
244 }
245 break;
246 default:
247 if (!argc)
248 goto do_action_list;
249
250 for (i = 0; argv[i]; i++) {
251 char *var, *value;
252 char *arg = strdup(argv[i]);
253
254 if (!arg) {
255 pr_err("%s: strdup failed\n", __func__);
256 goto out_err;
257 }
258
259 if (parse_config_arg(arg, var: &var, value: &value) < 0) {
260 free(arg);
261 goto out_err;
262 }
263
264 if (value == NULL) {
265 if (show_spec_config(set, var) < 0) {
266 pr_err("%s is not configured: %s\n",
267 var, config_filename);
268 free(arg);
269 goto out_err;
270 }
271 } else {
272 if (perf_config_set__collect(set, file_name: config_filename,
273 var, value) < 0) {
274 pr_err("Failed to add '%s=%s'\n",
275 var, value);
276 free(arg);
277 goto out_err;
278 }
279 changed = true;
280 }
281 free(arg);
282 }
283
284 if (!changed)
285 break;
286
287 if (set_config(set, file_name: config_filename) < 0) {
288 pr_err("Failed to set the configs on %s\n",
289 config_filename);
290 goto out_err;
291 }
292 }
293
294 ret = 0;
295out_err:
296 perf_config_set__delete(set);
297 return ret;
298}
299

source code of linux/tools/perf/builtin-config.c