xref: /openbmc/linux/tools/perf/builtin-config.c (revision 370ce164)
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 
set_config(struct perf_config_set * set,const char * file_name)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 
show_spec_config(struct perf_config_set * set,const char * var)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 
show_config(struct perf_config_set * set)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 
parse_config_arg(char * arg,char ** var,char ** value)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 
cmd_config(int argc,const char ** argv)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