aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/builtin-config.c
blob: 514f70f95b5788164ef11eb138e52eb6a2669b7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
// SPDX-License-Identifier: GPL-2.0
/*
 * builtin-config.c
 *
 * Copyright (C) 2015, Taeung Song <treeze.taeung@gmail.com>
 *
 */
#include "builtin.h"

#include "perf.h"

#include "util/cache.h"
#include <subcmd/parse-options.h>
#include "util/util.h"
#include "util/debug.h"
#include "util/config.h"
#include <linux/string.h>

static bool use_system_config, use_user_config;

static const char * const config_usage[] = {
	"perf config [<file-option>] [options] [section.name[=value] ...]",
	NULL
};

enum actions {
	ACTION_LIST = 1
} actions;

static struct option config_options[] = {
	OPT_SET_UINT('l', "list", &actions,
		     "show current config variables", ACTION_LIST),
	OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
	OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
	OPT_END()
};

static int set_config(struct perf_config_set *set, const char *file_name)
{
	struct perf_config_section *section = NULL;
	struct perf_config_item *item = NULL;
	const char *first_line = "# this file is auto-generated.";
	FILE *fp;

	if (set == NULL)
		return -1;

	fp = fopen(file_name, "w");
	if (!fp)
		return -1;

	fprintf(fp, "%s\n", first_line);

	/* overwrite configvariables */
	perf_config_items__for_each_entry(&set->sections, section) {
		if (!use_system_config && section->from_system_config)
			continue;
		fprintf(fp, "[%s]\n", section->name);

		perf_config_items__for_each_entry(&section->items, item) {
			if (!use_system_config && item->from_system_config)
				continue;
			if (item->value)
				fprintf(fp, "\t%s = %s\n",
					item->name, item->value);
		}
	}
	fclose(fp);

	return 0;
}

static int show_spec_config(struct perf_config_set *set, const char *var)
{
	struct perf_config_section *section;
	struct perf_config_item *item;

	if (set == NULL)
		return -1;

	perf_config_items__for_each_entry(&set->sections, section) {
		if (!strstarts(var, section->name))
			continue;

		perf_config_items__for_each_entry(&section->items, item) {
			const char *name = var + strlen(section->name) + 1;

			if (strcmp(name, item->name) == 0) {
				char *value = item->value;

				if (value) {
					printf("%s=%s\n", var, value);
					return 0;
				}
			}

		}
	}

	return 0;
}

static int show_config(struct perf_config_set *set)
{
	struct perf_config_section *section;
	struct perf_config_item *item;

	if (set == NULL)
		return -1;

	perf_config_set__for_each_entry(set, section, item) {
		char *value = item->value;

		if (value)
			printf("%s.%s=%s\n", section->name,
			       item->name, value);
	}

	return 0;
}

static int parse_config_arg(char *arg, char **var, char **value)
{
	const char *last_dot = strchr(arg, '.');

	/*
	 * Since "var" actually contains the section name and the real
	 * config variable name separated by a dot, we have to know where the dot is.
	 */
	if (last_dot == NULL || last_dot == arg) {
		pr_err("The config variable does not contain a section name: %s\n", arg);
		return -1;
	}
	if (!last_dot[1]) {
		pr_err("The config variable does not contain a variable name: %s\n", arg);
		return -1;
	}

	*value = strchr(arg, '=');
	if (*value == NULL)
		*var = arg;
	else if (!strcmp(*value, "=")) {
		pr_err("The config variable does not contain a value: %s\n", arg);
		return -1;
	} else {
		*value = *value + 1; /* excluding a first character '=' */
		*var = strsep(&arg, "=");
		if (*var[0] == '\0') {
			pr_err("invalid config variable: %s\n", arg);
			return -1;
		}
	}

	return 0;
}

int cmd_config(int argc, const char **argv)
{
	int i, ret = -1;
	struct perf_config_set *set;
	char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
	const char *config_filename;
	bool changed = false;

	argc = parse_options(argc, argv, config_options, config_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);

	if (use_system_config && use_user_config) {
		pr_err("Error: only one config file at a time\n");
		parse_options_usage(config_usage, config_options, "user", 0);
		parse_options_usage(NULL, config_options, "system", 0);
		return -1;
	}

	if (use_system_config)
		config_exclusive_filename = perf_etc_perfconfig();
	else if (use_user_config)
		config_exclusive_filename = user_config;

	if (!config_exclusive_filename)
		config_filename = user_config;
	else
		config_filename = config_exclusive_filename;

	/*
	 * At only 'config' sub-command, individually use the config set
	 * because of reinitializing with options config file location.
	 */
	set = perf_config_set__new();
	if (!set)
		goto out_err;

	switch (actions) {
	case ACTION_LIST:
		if (argc) {
			pr_err("Error: takes no arguments\n");
			parse_options_usage(config_usage, config_options, "l", 1);
		} else {
			if (show_config(set) < 0) {
				pr_err("Nothing configured, "
				       "please check your %s \n", config_filename);
				goto out_err;
			}
		}
		break;
	default:
		if (!argc) {
			usage_with_options(config_usage, config_options);
			break;
		}

		for (i = 0; argv[i]; i++) {
			char *var, *value;
			char *arg = strdup(argv[i]);

			if (!arg) {
				pr_err("%s: strdup failed\n", __func__);
				goto out_err;
			}

			if (parse_config_arg(arg, &var, &value) < 0) {
				free(arg);
				goto out_err;
			}

			if (value == NULL) {
				if (show_spec_config(set, var) < 0) {
					pr_err("%s is not configured: %s\n",
					       var, config_filename);
					free(arg);
					goto out_err;
				}
			} else {
				if (perf_config_set__collect(set, config_filename,
							     var, value) < 0) {
					pr_err("Failed to add '%s=%s'\n",
					       var, value);
					free(arg);
					goto out_err;
				}
				changed = true;
			}
			free(arg);
		}

		if (!changed)
			break;

		if (set_config(set, config_filename) < 0) {
			pr_err("Failed to set the configs on %s\n",
			       config_filename);
			goto out_err;
		}
	}

	ret = 0;
out_err:
	perf_config_set__delete(set);
	return ret;
}