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
19 static bool use_system_config, use_user_config;
20
21 static const char * const config_usage[] = {
22 "perf config [<file-option>] [options] [section.name[=value] ...]",
23 NULL
24 };
25
26 enum actions {
27 ACTION_LIST = 1
28 } actions;
29
30 static 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
38 static 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(§ion->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
73 static 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(var, section->name))
83 continue;
84
85 perf_config_items__for_each_entry(§ion->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
103 static 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
122 static 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
157 int cmd_config(int argc, const char **argv)
158 {
159 int i, ret = -1;
160 struct perf_config_set *set;
161 char path[PATH_MAX];
162 char *user_config = mkpath(path, sizeof(path), "%s/.perfconfig", getenv("HOME"));
163 const char *config_filename;
164 bool changed = false;
165
166 argc = parse_options(argc, argv, config_options, config_usage,
167 PARSE_OPT_STOP_AT_NON_OPTION);
168
169 if (use_system_config && use_user_config) {
170 pr_err("Error: only one config file at a time\n");
171 parse_options_usage(config_usage, config_options, "user", 0);
172 parse_options_usage(NULL, config_options, "system", 0);
173 return -1;
174 }
175
176 if (use_system_config)
177 config_exclusive_filename = perf_etc_perfconfig();
178 else if (use_user_config)
179 config_exclusive_filename = user_config;
180
181 if (!config_exclusive_filename)
182 config_filename = user_config;
183 else
184 config_filename = config_exclusive_filename;
185
186 /*
187 * At only 'config' sub-command, individually use the config set
188 * because of reinitializing with options config file location.
189 */
190 set = perf_config_set__new();
191 if (!set)
192 goto out_err;
193
194 switch (actions) {
195 case ACTION_LIST:
196 if (argc) {
197 pr_err("Error: takes no arguments\n");
198 parse_options_usage(config_usage, config_options, "l", 1);
199 } else {
200 do_action_list:
201 if (show_config(set) < 0) {
202 pr_err("Nothing configured, "
203 "please check your %s \n", config_filename);
204 goto out_err;
205 }
206 }
207 break;
208 default:
209 if (!argc)
210 goto do_action_list;
211
212 for (i = 0; argv[i]; i++) {
213 char *var, *value;
214 char *arg = strdup(argv[i]);
215
216 if (!arg) {
217 pr_err("%s: strdup failed\n", __func__);
218 goto out_err;
219 }
220
221 if (parse_config_arg(arg, &var, &value) < 0) {
222 free(arg);
223 goto out_err;
224 }
225
226 if (value == NULL) {
227 if (show_spec_config(set, var) < 0) {
228 pr_err("%s is not configured: %s\n",
229 var, config_filename);
230 free(arg);
231 goto out_err;
232 }
233 } else {
234 if (perf_config_set__collect(set, config_filename,
235 var, value) < 0) {
236 pr_err("Failed to add '%s=%s'\n",
237 var, value);
238 free(arg);
239 goto out_err;
240 }
241 changed = true;
242 }
243 free(arg);
244 }
245
246 if (!changed)
247 break;
248
249 if (set_config(set, config_filename) < 0) {
250 pr_err("Failed to set the configs on %s\n",
251 config_filename);
252 goto out_err;
253 }
254 }
255
256 ret = 0;
257 out_err:
258 perf_config_set__delete(set);
259 return ret;
260 }
261
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.