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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 "perf.h"
 11 
 12 #include "util/cache.h"
 13 #include <subcmd/parse-options.h>
 14 #include "util/util.h"
 15 #include "util/debug.h"
 16 #include "util/config.h"
 17 #include <linux/string.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(&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 
 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(&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 
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 *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
162         const char *config_filename;
163         bool changed = false;
164 
165         argc = parse_options(argc, argv, config_options, config_usage,
166                              PARSE_OPT_STOP_AT_NON_OPTION);
167 
168         if (use_system_config && use_user_config) {
169                 pr_err("Error: only one config file at a time\n");
170                 parse_options_usage(config_usage, config_options, "user", 0);
171                 parse_options_usage(NULL, config_options, "system", 0);
172                 return -1;
173         }
174 
175         if (use_system_config)
176                 config_exclusive_filename = perf_etc_perfconfig();
177         else if (use_user_config)
178                 config_exclusive_filename = user_config;
179 
180         if (!config_exclusive_filename)
181                 config_filename = user_config;
182         else
183                 config_filename = config_exclusive_filename;
184 
185         /*
186          * At only 'config' sub-command, individually use the config set
187          * because of reinitializing with options config file location.
188          */
189         set = perf_config_set__new();
190         if (!set)
191                 goto out_err;
192 
193         switch (actions) {
194         case ACTION_LIST:
195                 if (argc) {
196                         pr_err("Error: takes no arguments\n");
197                         parse_options_usage(config_usage, config_options, "l", 1);
198                 } else {
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                         usage_with_options(config_usage, config_options);
209                         break;
210                 }
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 

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