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Linux/tools/perf/builtin-config.c

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

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