[mirror_ubuntu-bionic-kernel.git] / tools / perf / util / config.c

/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 * Copyright (C) Johannes Schindelin, 2005
 *
 */
#include "util.h"
#include "cache.h"
#include "exec_cmd.h"

#define MAXNAME (256)

#define DEBUG_CACHE_DIR ".debug"


char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */

static FILE *config_file;
static const char *config_file_name;
static int config_linenr;
static int config_file_eof;

static const char *config_exclusive_filename;

static int get_next_char(void)
{
	int c;
	FILE *f;

	c = '\n';
	if ((f = config_file) != NULL) {
		c = fgetc(f);
		if (c == '\r') {
			/* DOS like systems */
			c = fgetc(f);
			if (c != '\n') {
				ungetc(c, f);
				c = '\r';
			}
		}
		if (c == '\n')
			config_linenr++;
		if (c == EOF) {
			config_file_eof = 1;
			c = '\n';
		}
	}
	return c;
}

static char *parse_value(void)
{
	static char value[1024];
	int quote = 0, comment = 0, space = 0;
	size_t len = 0;

	for (;;) {
		int c = get_next_char();

		if (len >= sizeof(value) - 1)
			return NULL;
		if (c == '\n') {
			if (quote)
				return NULL;
			value[len] = 0;
			return value;
		}
		if (comment)
			continue;
		if (isspace(c) && !quote) {
			space = 1;
			continue;
		}
		if (!quote) {
			if (c == ';' || c == '#') {
				comment = 1;
				continue;
			}
		}
		if (space) {
			if (len)
				value[len++] = ' ';
			space = 0;
		}
		if (c == '\\') {
			c = get_next_char();
			switch (c) {
			case '\n':
				continue;
			case 't':
				c = '\t';
				break;
			case 'b':
				c = '\b';
				break;
			case 'n':
				c = '\n';
				break;
			/* Some characters escape as themselves */
			case '\\': case '"':
				break;
			/* Reject unknown escape sequences */
			default:
				return NULL;
			}
			value[len++] = c;
			continue;
		}
		if (c == '"') {
			quote = 1-quote;
			continue;
		}
		value[len++] = c;
	}
}

static inline int iskeychar(int c)
{
	return isalnum(c) || c == '-';
}

static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
{
	int c;
	char *value;

	/* Get the full name */
	for (;;) {
		c = get_next_char();
		if (config_file_eof)
			break;
		if (!iskeychar(c))
			break;
		name[len++] = c;
		if (len >= MAXNAME)
			return -1;
	}
	name[len] = 0;
	while (c == ' ' || c == '\t')
		c = get_next_char();

	value = NULL;
	if (c != '\n') {
		if (c != '=')
			return -1;
		value = parse_value();
		if (!value)
			return -1;
	}
	return fn(name, value, data);
}

static int get_extended_base_var(char *name, int baselen, int c)
{
	do {
		if (c == '\n')
			return -1;
		c = get_next_char();
	} while (isspace(c));

	/* We require the format to be '[base "extension"]' */
	if (c != '"')
		return -1;
	name[baselen++] = '.';

	for (;;) {
		int ch = get_next_char();

		if (ch == '\n')
			return -1;
		if (ch == '"')
			break;
		if (ch == '\\') {
			ch = get_next_char();
			if (ch == '\n')
				return -1;
		}
		name[baselen++] = ch;
		if (baselen > MAXNAME / 2)
			return -1;
	}

	/* Final ']' */
	if (get_next_char() != ']')
		return -1;
	return baselen;
}

static int get_base_var(char *name)
{
	int baselen = 0;

	for (;;) {
		int c = get_next_char();
		if (config_file_eof)
			return -1;
		if (c == ']')
			return baselen;
		if (isspace(c))
			return get_extended_base_var(name, baselen, c);
		if (!iskeychar(c) && c != '.')
			return -1;
		if (baselen > MAXNAME / 2)
			return -1;
		name[baselen++] = tolower(c);
	}
}

static int perf_parse_file(config_fn_t fn, void *data)
{
	int comment = 0;
	int baselen = 0;
	static char var[MAXNAME];

	/* U+FEFF Byte Order Mark in UTF8 */
	static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
	const unsigned char *bomptr = utf8_bom;

	for (;;) {
		int c = get_next_char();
		if (bomptr && *bomptr) {
			/* We are at the file beginning; skip UTF8-encoded BOM
			 * if present. Sane editors won't put this in on their
			 * own, but e.g. Windows Notepad will do it happily. */
			if ((unsigned char) c == *bomptr) {
				bomptr++;
				continue;
			} else {
				/* Do not tolerate partial BOM. */
				if (bomptr != utf8_bom)
					break;
				/* No BOM at file beginning. Cool. */
				bomptr = NULL;
			}
		}
		if (c == '\n') {
			if (config_file_eof)
				return 0;
			comment = 0;
			continue;
		}
		if (comment || isspace(c))
			continue;
		if (c == '#' || c == ';') {
			comment = 1;
			continue;
		}
		if (c == '[') {
			baselen = get_base_var(var);
			if (baselen <= 0)
				break;
			var[baselen++] = '.';
			var[baselen] = 0;
			continue;
		}
		if (!isalpha(c))
			break;
		var[baselen] = tolower(c);
		if (get_value(fn, data, var, baselen+1) < 0)
			break;
	}
	die("bad config file line %d in %s", config_linenr, config_file_name);
}

static int parse_unit_factor(const char *end, unsigned long *val)
{
	if (!*end)
		return 1;
	else if (!strcasecmp(end, "k")) {
		*val *= 1024;
		return 1;
	}
	else if (!strcasecmp(end, "m")) {
		*val *= 1024 * 1024;
		return 1;
	}
	else if (!strcasecmp(end, "g")) {
		*val *= 1024 * 1024 * 1024;
		return 1;
	}
	return 0;
}

static int perf_parse_long(const char *value, long *ret)
{
	if (value && *value) {
		char *end;
		long val = strtol(value, &end, 0);
		unsigned long factor = 1;
		if (!parse_unit_factor(end, &factor))
			return 0;
		*ret = val * factor;
		return 1;
	}
	return 0;
}

static void die_bad_config(const char *name)
{
	if (config_file_name)
		die("bad config value for '%s' in %s", name, config_file_name);
	die("bad config value for '%s'", name);
}

int perf_config_int(const char *name, const char *value)
{
	long ret = 0;
	if (!perf_parse_long(value, &ret))
		die_bad_config(name);
	return ret;
}

static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
{
	*is_bool = 1;
	if (!value)
		return 1;
	if (!*value)
		return 0;
	if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
		return 1;
	if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
		return 0;
	*is_bool = 0;
	return perf_config_int(name, value);
}

int perf_config_bool(const char *name, const char *value)
{
	int discard;
	return !!perf_config_bool_or_int(name, value, &discard);
}

const char *perf_config_dirname(const char *name, const char *value)
{
	if (!name)
		return NULL;
	return value;
}

static int perf_default_core_config(const char *var __used, const char *value __used)
{
	/* Add other config variables here. */
	return 0;
}

int perf_default_config(const char *var, const char *value, void *dummy __used)
{
	if (!prefixcmp(var, "core."))
		return perf_default_core_config(var, value);

	/* Add other config variables here. */
	return 0;
}

static int perf_config_from_file(config_fn_t fn, const char *filename, void *data)
{
	int ret;
	FILE *f = fopen(filename, "r");

	ret = -1;
	if (f) {
		config_file = f;
		config_file_name = filename;
		config_linenr = 1;
		config_file_eof = 0;
		ret = perf_parse_file(fn, data);
		fclose(f);
		config_file_name = NULL;
	}
	return ret;
}

static const char *perf_etc_perfconfig(void)
{
	static const char *system_wide;
	if (!system_wide)
		system_wide = system_path(ETC_PERFCONFIG);
	return system_wide;
}

static int perf_env_bool(const char *k, int def)
{
	const char *v = getenv(k);
	return v ? perf_config_bool(k, v) : def;
}

static int perf_config_system(void)
{
	return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
}

static int perf_config_global(void)
{
	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
}

int perf_config(config_fn_t fn, void *data)
{
	int ret = 0, found = 0;
	const char *home = NULL;

	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
	if (config_exclusive_filename)
		return perf_config_from_file(fn, config_exclusive_filename, data);
	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
		ret += perf_config_from_file(fn, perf_etc_perfconfig(),
					    data);
		found += 1;
	}

	home = getenv("HOME");
	if (perf_config_global() && home) {
		char *user_config = strdup(mkpath("%s/.perfconfig", home));
		struct stat st;

		if (user_config == NULL) {
			warning("Not enough memory to process %s/.perfconfig, "
				"ignoring it.", home);
			goto out;
		}

		if (stat(user_config, &st) < 0)
			goto out_free;

		if (st.st_uid && (st.st_uid != geteuid())) {
			warning("File %s not owned by current user or root, "
				"ignoring it.", user_config);
			goto out_free;
		}

		if (!st.st_size)
			goto out_free;

		ret += perf_config_from_file(fn, user_config, data);
		found += 1;
out_free:
		free(user_config);
	}
out:
	if (found == 0)
		return -1;
	return ret;
}

/*
 * Call this to report error for your variable that should not
 * get a boolean value (i.e. "[my] var" means "true").
 */
int config_error_nonbool(const char *var)
{
	return error("Missing value for '%s'", var);
}

struct buildid_dir_config {
	char *dir;
};

static int buildid_dir_command_config(const char *var, const char *value,
				      void *data)
{
	struct buildid_dir_config *c = data;
	const char *v;

	/* same dir for all commands */
	if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
		v = perf_config_dirname(var, value);
		if (!v)
			return -1;
		strncpy(c->dir, v, MAXPATHLEN-1);
		c->dir[MAXPATHLEN-1] = '\0';
	}
	return 0;
}

static void check_buildid_dir_config(void)
{
	struct buildid_dir_config c;
	c.dir = buildid_dir;
	perf_config(buildid_dir_command_config, &c);
}

void set_buildid_dir(void)
{
	buildid_dir[0] = '\0';

	/* try config file */
	check_buildid_dir_config();

	/* default to $HOME/.debug */
	if (buildid_dir[0] == '\0') {
		char *v = getenv("HOME");
		if (v) {
			snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
				 v, DEBUG_CACHE_DIR);
		} else {
			strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
		}
		buildid_dir[MAXPATHLEN-1] = '\0';
	}
	/* for communicating with external commands */
	setenv("PERF_BUILDID_DIR", buildid_dir, 1);
}
Commit	Line	Data
07800601 IM	1	/*
	2	* GIT - The information manager from hell
	3	*
	4	* Copyright (C) Linus Torvalds, 2005
	5	* Copyright (C) Johannes Schindelin, 2005
	6	*
	7	*/
	8	#include "util.h"
	9	#include "cache.h"
	10	#include "exec_cmd.h"
	11
	12	#define MAXNAME (256)
	13
45de34bb SE	14	#define DEBUG_CACHE_DIR ".debug"
	15
	16
	17	char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
	18
07800601 IM	19	static FILE *config_file;
	20	static const char *config_file_name;
	21	static int config_linenr;
	22	static int config_file_eof;
07800601	23
a41794cd	24	static const char *config_exclusive_filename;
07800601 IM	25
	26	static int get_next_char(void)
	27	{
	28	int c;
	29	FILE *f;
	30
	31	c = '\n';
	32	if ((f = config_file) != NULL) {
	33	c = fgetc(f);
	34	if (c == '\r') {
	35	/* DOS like systems */
	36	c = fgetc(f);
	37	if (c != '\n') {
	38	ungetc(c, f);
	39	c = '\r';
	40	}
	41	}
	42	if (c == '\n')
	43	config_linenr++;
	44	if (c == EOF) {
	45	config_file_eof = 1;
	46	c = '\n';
	47	}
	48	}
	49	return c;
	50	}
	51
	52	static char *parse_value(void)
	53	{
	54	static char value[1024];
f37a291c IM	55	int quote = 0, comment = 0, space = 0;
f37a291c IM	56	size_t len = 0;
07800601 IM	57
	58	for (;;) {
	59	int c = get_next_char();
f37a291c	60
07800601 IM	61	if (len >= sizeof(value) - 1)
	62	return NULL;
	63	if (c == '\n') {
	64	if (quote)
	65	return NULL;
	66	value[len] = 0;
	67	return value;
	68	}
	69	if (comment)
	70	continue;
	71	if (isspace(c) && !quote) {
	72	space = 1;
	73	continue;
	74	}
	75	if (!quote) {
	76	if (c == ';' \|\| c == '#') {
	77	comment = 1;
	78	continue;
	79	}
	80	}
	81	if (space) {
	82	if (len)
	83	value[len++] = ' ';
	84	space = 0;
	85	}
	86	if (c == '\\') {
	87	c = get_next_char();
	88	switch (c) {
	89	case '\n':
	90	continue;
	91	case 't':
	92	c = '\t';
	93	break;
	94	case 'b':
	95	c = '\b';
	96	break;
	97	case 'n':
	98	c = '\n';
	99	break;
	100	/* Some characters escape as themselves */
	101	case '\\': case '"':
	102	break;
	103	/* Reject unknown escape sequences */
	104	default:
	105	return NULL;
	106	}
	107	value[len++] = c;
	108	continue;
	109	}
	110	if (c == '"') {
	111	quote = 1-quote;
	112	continue;
	113	}
	114	value[len++] = c;
	115	}
	116	}
	117
	118	static inline int iskeychar(int c)
	119	{
	120	return isalnum(c) \|\| c == '-';
	121	}
	122
	123	static int get_value(config_fn_t fn, void data, char name, unsigned int len)
	124	{
125	int c;
126	char *value;
127
128	/* Get the full name */
129	for (;;) {
130	c = get_next_char();
131	if (config_file_eof)
132	break;
133	if (!iskeychar(c))
134	break;
45de34bb	135	name[len++] = c;
07800601 IM	136	if (len >= MAXNAME)
	137	return -1;
	138	}
	139	name[len] = 0;
	140	while (c == ' ' \|\| c == '\t')
	141	c = get_next_char();
	142
	143	value = NULL;
	144	if (c != '\n') {
	145	if (c != '=')
	146	return -1;
	147	value = parse_value();
	148	if (!value)
	149	return -1;
	150	}
	151	return fn(name, value, data);
	152	}
	153
	154	static int get_extended_base_var(char *name, int baselen, int c)
	155	{
	156	do {
	157	if (c == '\n')
	158	return -1;
	159	c = get_next_char();
	160	} while (isspace(c));
	161
	162	/* We require the format to be '[base "extension"]' */
	163	if (c != '"')
	164	return -1;
	165	name[baselen++] = '.';
	166
	167	for (;;) {
83a0944f IM	168	int ch = get_next_char();
	169
	170	if (ch == '\n')
07800601	171	return -1;
83a0944f	172	if (ch == '"')
07800601	173	break;
83a0944f IM	174	if (ch == '\\') {
	175	ch = get_next_char();
	176	if (ch == '\n')
07800601 IM	177	return -1;
07800601 IM	178	}
83a0944f	179	name[baselen++] = ch;
07800601 IM	180	if (baselen > MAXNAME / 2)
	181	return -1;
	182	}
	183
	184	/* Final ']' */
	185	if (get_next_char() != ']')
	186	return -1;
	187	return baselen;
	188	}
	189
	190	static int get_base_var(char *name)
	191	{
	192	int baselen = 0;
	193
	194	for (;;) {
	195	int c = get_next_char();
	196	if (config_file_eof)
	197	return -1;
	198	if (c == ']')
	199	return baselen;
	200	if (isspace(c))
	201	return get_extended_base_var(name, baselen, c);
	202	if (!iskeychar(c) && c != '.')
	203	return -1;
	204	if (baselen > MAXNAME / 2)
	205	return -1;
	206	name[baselen++] = tolower(c);
	207	}
	208	}
	209
	210	static int perf_parse_file(config_fn_t fn, void *data)
	211	{
	212	int comment = 0;
	213	int baselen = 0;
	214	static char var[MAXNAME];
	215
	216	/* U+FEFF Byte Order Mark in UTF8 */
	217	static const unsigned char utf8_bom = (unsigned char ) "\xef\xbb\xbf";
	218	const unsigned char *bomptr = utf8_bom;
	219
	220	for (;;) {
	221	int c = get_next_char();
	222	if (bomptr && *bomptr) {
	223	/* We are at the file beginning; skip UTF8-encoded BOM
	224	* if present. Sane editors won't put this in on their
	225	* own, but e.g. Windows Notepad will do it happily. */
	226	if ((unsigned char) c == *bomptr) {
	227	bomptr++;
	228	continue;
	229	} else {
	230	/* Do not tolerate partial BOM. */
	231	if (bomptr != utf8_bom)
	232	break;
	233	/* No BOM at file beginning. Cool. */
	234	bomptr = NULL;
	235	}
	236	}
	237	if (c == '\n') {
	238	if (config_file_eof)
	239	return 0;
	240	comment = 0;
	241	continue;
	242	}
	243	if (comment \|\| isspace(c))
244	continue;
245	if (c == '#' \|\| c == ';') {
246	comment = 1;
247	continue;
248	}
249	if (c == '[') {
250	baselen = get_base_var(var);
251	if (baselen <= 0)
252	break;
253	var[baselen++] = '.';
254	var[baselen] = 0;
255	continue;
256	}
257	if (!isalpha(c))
258	break;
259	var[baselen] = tolower(c);
260	if (get_value(fn, data, var, baselen+1) < 0)
261	break;
262	}
263	die("bad config file line %d in %s", config_linenr, config_file_name);
264	}
265
266	static int parse_unit_factor(const char end, unsigned long val)
267	{
268	if (!*end)
269	return 1;
270	else if (!strcasecmp(end, "k")) {
271	val = 1024;
272	return 1;
273	}
274	else if (!strcasecmp(end, "m")) {
275	val = 1024 * 1024;
276	return 1;
277	}
278	else if (!strcasecmp(end, "g")) {
279	val = 1024 * 1024 * 1024;
280	return 1;
281	}
282	return 0;
283	}
284
285	static int perf_parse_long(const char value, long ret)
286	{
287	if (value && *value) {
288	char *end;
289	long val = strtol(value, &end, 0);
290	unsigned long factor = 1;
291	if (!parse_unit_factor(end, &factor))
292	return 0;
293	ret = val factor;
294	return 1;
295	}
296	return 0;
297	}
298
07800601 IM	299	static void die_bad_config(const char *name)
	300	{
	301	if (config_file_name)
	302	die("bad config value for '%s' in %s", name, config_file_name);
	303	die("bad config value for '%s'", name);
	304	}
	305
	306	int perf_config_int(const char name, const char value)
	307	{
	308	long ret = 0;
	309	if (!perf_parse_long(value, &ret))
	310	die_bad_config(name);
	311	return ret;
	312	}
	313
a41794cd	314	static int perf_config_bool_or_int(const char name, const char value, int *is_bool)
07800601 IM	315	{
	316	*is_bool = 1;
	317	if (!value)
	318	return 1;
	319	if (!*value)
	320	return 0;
	321	if (!strcasecmp(value, "true") \|\| !strcasecmp(value, "yes") \|\| !strcasecmp(value, "on"))
	322	return 1;
	323	if (!strcasecmp(value, "false") \|\| !strcasecmp(value, "no") \|\| !strcasecmp(value, "off"))
	324	return 0;
	325	*is_bool = 0;
	326	return perf_config_int(name, value);
	327	}
	328
	329	int perf_config_bool(const char name, const char value)
	330	{
	331	int discard;
	332	return !!perf_config_bool_or_int(name, value, &discard);
	333	}
	334
45de34bb SE	335	const char perf_config_dirname(const char name, const char *value)
	336	{
	337	if (!name)
	338	return NULL;
	339	return value;
	340	}
	341
f37a291c	342	static int perf_default_core_config(const char var __used, const char value __used)
07800601	343	{
395cf969	344	/* Add other config variables here. */
07800601 IM	345	return 0;
	346	}
	347
f37a291c	348	int perf_default_config(const char var, const char value, void *dummy __used)
07800601 IM	349	{
	350	if (!prefixcmp(var, "core."))
	351	return perf_default_core_config(var, value);
	352
395cf969	353	/* Add other config variables here. */
07800601 IM	354	return 0;
	355	}
	356
a41794cd	357	static int perf_config_from_file(config_fn_t fn, const char filename, void data)
07800601 IM	358	{
	359	int ret;
	360	FILE *f = fopen(filename, "r");
	361
	362	ret = -1;
	363	if (f) {
	364	config_file = f;
	365	config_file_name = filename;
	366	config_linenr = 1;
	367	config_file_eof = 0;
	368	ret = perf_parse_file(fn, data);
	369	fclose(f);
	370	config_file_name = NULL;
	371	}
	372	return ret;
	373	}
	374
a41794cd	375	static const char *perf_etc_perfconfig(void)
07800601 IM	376	{
	377	static const char *system_wide;
	378	if (!system_wide)
	379	system_wide = system_path(ETC_PERFCONFIG);
	380	return system_wide;
	381	}
	382
	383	static int perf_env_bool(const char *k, int def)
	384	{
	385	const char *v = getenv(k);
	386	return v ? perf_config_bool(k, v) : def;
	387	}
	388
a41794cd	389	static int perf_config_system(void)
07800601 IM	390	{
	391	return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
	392	}
	393
a41794cd	394	static int perf_config_global(void)
07800601 IM	395	{
	396	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
	397	}
	398
	399	int perf_config(config_fn_t fn, void *data)
	400	{
	401	int ret = 0, found = 0;
07800601 IM	402	const char *home = NULL;
	403
	404	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
	405	if (config_exclusive_filename)
	406	return perf_config_from_file(fn, config_exclusive_filename, data);
	407	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
	408	ret += perf_config_from_file(fn, perf_etc_perfconfig(),
	409	data);
	410	found += 1;
	411	}
	412
	413	home = getenv("HOME");
	414	if (perf_config_global() && home) {
	415	char *user_config = strdup(mkpath("%s/.perfconfig", home));
069e3725 ACM	416	struct stat st;
	417
	418	if (user_config == NULL) {
	419	warning("Not enough memory to process %s/.perfconfig, "
	420	"ignoring it.", home);
	421	goto out;
	422	}
	423
	424	if (stat(user_config, &st) < 0)
	425	goto out_free;
	426
	427	if (st.st_uid && (st.st_uid != geteuid())) {
	428	warning("File %s not owned by current user or root, "
	429	"ignoring it.", user_config);
	430	goto out_free;
07800601	431	}
069e3725 ACM	432
	433	if (!st.st_size)
	434	goto out_free;
	435
	436	ret += perf_config_from_file(fn, user_config, data);
	437	found += 1;
	438	out_free:
07800601 IM	439	free(user_config);
07800601 IM	440	}
069e3725	441	out:
07800601 IM	442	if (found == 0)
	443	return -1;
	444	return ret;
	445	}
	446
07800601 IM	447	/*
	448	* Call this to report error for your variable that should not
	449	* get a boolean value (i.e. "[my] var" means "true").
	450	*/
	451	int config_error_nonbool(const char *var)
	452	{
	453	return error("Missing value for '%s'", var);
	454	}
45de34bb SE	455
	456	struct buildid_dir_config {
	457	char *dir;
	458	};
	459
	460	static int buildid_dir_command_config(const char var, const char value,
	461	void *data)
	462	{
	463	struct buildid_dir_config *c = data;
	464	const char *v;
	465
	466	/* same dir for all commands */
	467	if (!prefixcmp(var, "buildid.") && !strcmp(var + 8, "dir")) {
	468	v = perf_config_dirname(var, value);
	469	if (!v)
	470	return -1;
	471	strncpy(c->dir, v, MAXPATHLEN-1);
	472	c->dir[MAXPATHLEN-1] = '\0';
	473	}
	474	return 0;
	475	}
	476
	477	static void check_buildid_dir_config(void)
	478	{
	479	struct buildid_dir_config c;
	480	c.dir = buildid_dir;
	481	perf_config(buildid_dir_command_config, &c);
	482	}
	483
	484	void set_buildid_dir(void)
	485	{
	486	buildid_dir[0] = '\0';
	487
	488	/* try config file */
	489	check_buildid_dir_config();
	490
	491	/* default to $HOME/.debug */
	492	if (buildid_dir[0] == '\0') {
	493	char *v = getenv("HOME");
	494	if (v) {
	495	snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
	496	v, DEBUG_CACHE_DIR);
	497	} else {
	498	strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
	499	}
	500	buildid_dir[MAXPATHLEN-1] = '\0';
	501	}
	502	/* for communicating with external commands */
	503	setenv("PERF_BUILDID_DIR", buildid_dir, 1);
	504	}