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