Ingo Molnar | 0780060 | 2009-04-20 15:00:56 +0200 | [diff] [blame^] | 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 | |
| 14 | static FILE *config_file; |
| 15 | static const char *config_file_name; |
| 16 | static int config_linenr; |
| 17 | static int config_file_eof; |
| 18 | static int zlib_compression_seen; |
| 19 | |
| 20 | const char *config_exclusive_filename = NULL; |
| 21 | |
| 22 | static int get_next_char(void) |
| 23 | { |
| 24 | int c; |
| 25 | FILE *f; |
| 26 | |
| 27 | c = '\n'; |
| 28 | if ((f = config_file) != NULL) { |
| 29 | c = fgetc(f); |
| 30 | if (c == '\r') { |
| 31 | /* DOS like systems */ |
| 32 | c = fgetc(f); |
| 33 | if (c != '\n') { |
| 34 | ungetc(c, f); |
| 35 | c = '\r'; |
| 36 | } |
| 37 | } |
| 38 | if (c == '\n') |
| 39 | config_linenr++; |
| 40 | if (c == EOF) { |
| 41 | config_file_eof = 1; |
| 42 | c = '\n'; |
| 43 | } |
| 44 | } |
| 45 | return c; |
| 46 | } |
| 47 | |
| 48 | static char *parse_value(void) |
| 49 | { |
| 50 | static char value[1024]; |
| 51 | int quote = 0, comment = 0, len = 0, space = 0; |
| 52 | |
| 53 | for (;;) { |
| 54 | int c = get_next_char(); |
| 55 | if (len >= sizeof(value) - 1) |
| 56 | return NULL; |
| 57 | if (c == '\n') { |
| 58 | if (quote) |
| 59 | return NULL; |
| 60 | value[len] = 0; |
| 61 | return value; |
| 62 | } |
| 63 | if (comment) |
| 64 | continue; |
| 65 | if (isspace(c) && !quote) { |
| 66 | space = 1; |
| 67 | continue; |
| 68 | } |
| 69 | if (!quote) { |
| 70 | if (c == ';' || c == '#') { |
| 71 | comment = 1; |
| 72 | continue; |
| 73 | } |
| 74 | } |
| 75 | if (space) { |
| 76 | if (len) |
| 77 | value[len++] = ' '; |
| 78 | space = 0; |
| 79 | } |
| 80 | if (c == '\\') { |
| 81 | c = get_next_char(); |
| 82 | switch (c) { |
| 83 | case '\n': |
| 84 | continue; |
| 85 | case 't': |
| 86 | c = '\t'; |
| 87 | break; |
| 88 | case 'b': |
| 89 | c = '\b'; |
| 90 | break; |
| 91 | case 'n': |
| 92 | c = '\n'; |
| 93 | break; |
| 94 | /* Some characters escape as themselves */ |
| 95 | case '\\': case '"': |
| 96 | break; |
| 97 | /* Reject unknown escape sequences */ |
| 98 | default: |
| 99 | return NULL; |
| 100 | } |
| 101 | value[len++] = c; |
| 102 | continue; |
| 103 | } |
| 104 | if (c == '"') { |
| 105 | quote = 1-quote; |
| 106 | continue; |
| 107 | } |
| 108 | value[len++] = c; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static inline int iskeychar(int c) |
| 113 | { |
| 114 | return isalnum(c) || c == '-'; |
| 115 | } |
| 116 | |
| 117 | static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) |
| 118 | { |
| 119 | int c; |
| 120 | char *value; |
| 121 | |
| 122 | /* Get the full name */ |
| 123 | for (;;) { |
| 124 | c = get_next_char(); |
| 125 | if (config_file_eof) |
| 126 | break; |
| 127 | if (!iskeychar(c)) |
| 128 | break; |
| 129 | name[len++] = tolower(c); |
| 130 | if (len >= MAXNAME) |
| 131 | return -1; |
| 132 | } |
| 133 | name[len] = 0; |
| 134 | while (c == ' ' || c == '\t') |
| 135 | c = get_next_char(); |
| 136 | |
| 137 | value = NULL; |
| 138 | if (c != '\n') { |
| 139 | if (c != '=') |
| 140 | return -1; |
| 141 | value = parse_value(); |
| 142 | if (!value) |
| 143 | return -1; |
| 144 | } |
| 145 | return fn(name, value, data); |
| 146 | } |
| 147 | |
| 148 | static int get_extended_base_var(char *name, int baselen, int c) |
| 149 | { |
| 150 | do { |
| 151 | if (c == '\n') |
| 152 | return -1; |
| 153 | c = get_next_char(); |
| 154 | } while (isspace(c)); |
| 155 | |
| 156 | /* We require the format to be '[base "extension"]' */ |
| 157 | if (c != '"') |
| 158 | return -1; |
| 159 | name[baselen++] = '.'; |
| 160 | |
| 161 | for (;;) { |
| 162 | int c = get_next_char(); |
| 163 | if (c == '\n') |
| 164 | return -1; |
| 165 | if (c == '"') |
| 166 | break; |
| 167 | if (c == '\\') { |
| 168 | c = get_next_char(); |
| 169 | if (c == '\n') |
| 170 | return -1; |
| 171 | } |
| 172 | name[baselen++] = c; |
| 173 | if (baselen > MAXNAME / 2) |
| 174 | return -1; |
| 175 | } |
| 176 | |
| 177 | /* Final ']' */ |
| 178 | if (get_next_char() != ']') |
| 179 | return -1; |
| 180 | return baselen; |
| 181 | } |
| 182 | |
| 183 | static int get_base_var(char *name) |
| 184 | { |
| 185 | int baselen = 0; |
| 186 | |
| 187 | for (;;) { |
| 188 | int c = get_next_char(); |
| 189 | if (config_file_eof) |
| 190 | return -1; |
| 191 | if (c == ']') |
| 192 | return baselen; |
| 193 | if (isspace(c)) |
| 194 | return get_extended_base_var(name, baselen, c); |
| 195 | if (!iskeychar(c) && c != '.') |
| 196 | return -1; |
| 197 | if (baselen > MAXNAME / 2) |
| 198 | return -1; |
| 199 | name[baselen++] = tolower(c); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | static int perf_parse_file(config_fn_t fn, void *data) |
| 204 | { |
| 205 | int comment = 0; |
| 206 | int baselen = 0; |
| 207 | static char var[MAXNAME]; |
| 208 | |
| 209 | /* U+FEFF Byte Order Mark in UTF8 */ |
| 210 | static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf"; |
| 211 | const unsigned char *bomptr = utf8_bom; |
| 212 | |
| 213 | for (;;) { |
| 214 | int c = get_next_char(); |
| 215 | if (bomptr && *bomptr) { |
| 216 | /* We are at the file beginning; skip UTF8-encoded BOM |
| 217 | * if present. Sane editors won't put this in on their |
| 218 | * own, but e.g. Windows Notepad will do it happily. */ |
| 219 | if ((unsigned char) c == *bomptr) { |
| 220 | bomptr++; |
| 221 | continue; |
| 222 | } else { |
| 223 | /* Do not tolerate partial BOM. */ |
| 224 | if (bomptr != utf8_bom) |
| 225 | break; |
| 226 | /* No BOM at file beginning. Cool. */ |
| 227 | bomptr = NULL; |
| 228 | } |
| 229 | } |
| 230 | if (c == '\n') { |
| 231 | if (config_file_eof) |
| 232 | return 0; |
| 233 | comment = 0; |
| 234 | continue; |
| 235 | } |
| 236 | if (comment || isspace(c)) |
| 237 | continue; |
| 238 | if (c == '#' || c == ';') { |
| 239 | comment = 1; |
| 240 | continue; |
| 241 | } |
| 242 | if (c == '[') { |
| 243 | baselen = get_base_var(var); |
| 244 | if (baselen <= 0) |
| 245 | break; |
| 246 | var[baselen++] = '.'; |
| 247 | var[baselen] = 0; |
| 248 | continue; |
| 249 | } |
| 250 | if (!isalpha(c)) |
| 251 | break; |
| 252 | var[baselen] = tolower(c); |
| 253 | if (get_value(fn, data, var, baselen+1) < 0) |
| 254 | break; |
| 255 | } |
| 256 | die("bad config file line %d in %s", config_linenr, config_file_name); |
| 257 | } |
| 258 | |
| 259 | static int parse_unit_factor(const char *end, unsigned long *val) |
| 260 | { |
| 261 | if (!*end) |
| 262 | return 1; |
| 263 | else if (!strcasecmp(end, "k")) { |
| 264 | *val *= 1024; |
| 265 | return 1; |
| 266 | } |
| 267 | else if (!strcasecmp(end, "m")) { |
| 268 | *val *= 1024 * 1024; |
| 269 | return 1; |
| 270 | } |
| 271 | else if (!strcasecmp(end, "g")) { |
| 272 | *val *= 1024 * 1024 * 1024; |
| 273 | return 1; |
| 274 | } |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int perf_parse_long(const char *value, long *ret) |
| 279 | { |
| 280 | if (value && *value) { |
| 281 | char *end; |
| 282 | long val = strtol(value, &end, 0); |
| 283 | unsigned long factor = 1; |
| 284 | if (!parse_unit_factor(end, &factor)) |
| 285 | return 0; |
| 286 | *ret = val * factor; |
| 287 | return 1; |
| 288 | } |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | int perf_parse_ulong(const char *value, unsigned long *ret) |
| 293 | { |
| 294 | if (value && *value) { |
| 295 | char *end; |
| 296 | unsigned long val = strtoul(value, &end, 0); |
| 297 | if (!parse_unit_factor(end, &val)) |
| 298 | return 0; |
| 299 | *ret = val; |
| 300 | return 1; |
| 301 | } |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static void die_bad_config(const char *name) |
| 306 | { |
| 307 | if (config_file_name) |
| 308 | die("bad config value for '%s' in %s", name, config_file_name); |
| 309 | die("bad config value for '%s'", name); |
| 310 | } |
| 311 | |
| 312 | int perf_config_int(const char *name, const char *value) |
| 313 | { |
| 314 | long ret = 0; |
| 315 | if (!perf_parse_long(value, &ret)) |
| 316 | die_bad_config(name); |
| 317 | return ret; |
| 318 | } |
| 319 | |
| 320 | unsigned long perf_config_ulong(const char *name, const char *value) |
| 321 | { |
| 322 | unsigned long ret; |
| 323 | if (!perf_parse_ulong(value, &ret)) |
| 324 | die_bad_config(name); |
| 325 | return ret; |
| 326 | } |
| 327 | |
| 328 | int perf_config_bool_or_int(const char *name, const char *value, int *is_bool) |
| 329 | { |
| 330 | *is_bool = 1; |
| 331 | if (!value) |
| 332 | return 1; |
| 333 | if (!*value) |
| 334 | return 0; |
| 335 | if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on")) |
| 336 | return 1; |
| 337 | if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off")) |
| 338 | return 0; |
| 339 | *is_bool = 0; |
| 340 | return perf_config_int(name, value); |
| 341 | } |
| 342 | |
| 343 | int perf_config_bool(const char *name, const char *value) |
| 344 | { |
| 345 | int discard; |
| 346 | return !!perf_config_bool_or_int(name, value, &discard); |
| 347 | } |
| 348 | |
| 349 | int perf_config_string(const char **dest, const char *var, const char *value) |
| 350 | { |
| 351 | if (!value) |
| 352 | return config_error_nonbool(var); |
| 353 | *dest = strdup(value); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static int perf_default_core_config(const char *var, const char *value) |
| 358 | { |
| 359 | /* Add other config variables here and to Documentation/config.txt. */ |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | int perf_default_config(const char *var, const char *value, void *dummy) |
| 364 | { |
| 365 | if (!prefixcmp(var, "core.")) |
| 366 | return perf_default_core_config(var, value); |
| 367 | |
| 368 | /* Add other config variables here and to Documentation/config.txt. */ |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | int perf_config_from_file(config_fn_t fn, const char *filename, void *data) |
| 373 | { |
| 374 | int ret; |
| 375 | FILE *f = fopen(filename, "r"); |
| 376 | |
| 377 | ret = -1; |
| 378 | if (f) { |
| 379 | config_file = f; |
| 380 | config_file_name = filename; |
| 381 | config_linenr = 1; |
| 382 | config_file_eof = 0; |
| 383 | ret = perf_parse_file(fn, data); |
| 384 | fclose(f); |
| 385 | config_file_name = NULL; |
| 386 | } |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | const char *perf_etc_perfconfig(void) |
| 391 | { |
| 392 | static const char *system_wide; |
| 393 | if (!system_wide) |
| 394 | system_wide = system_path(ETC_PERFCONFIG); |
| 395 | return system_wide; |
| 396 | } |
| 397 | |
| 398 | static int perf_env_bool(const char *k, int def) |
| 399 | { |
| 400 | const char *v = getenv(k); |
| 401 | return v ? perf_config_bool(k, v) : def; |
| 402 | } |
| 403 | |
| 404 | int perf_config_system(void) |
| 405 | { |
| 406 | return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0); |
| 407 | } |
| 408 | |
| 409 | int perf_config_global(void) |
| 410 | { |
| 411 | return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0); |
| 412 | } |
| 413 | |
| 414 | int perf_config(config_fn_t fn, void *data) |
| 415 | { |
| 416 | int ret = 0, found = 0; |
| 417 | char *repo_config = NULL; |
| 418 | const char *home = NULL; |
| 419 | |
| 420 | /* Setting $PERF_CONFIG makes perf read _only_ the given config file. */ |
| 421 | if (config_exclusive_filename) |
| 422 | return perf_config_from_file(fn, config_exclusive_filename, data); |
| 423 | if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) { |
| 424 | ret += perf_config_from_file(fn, perf_etc_perfconfig(), |
| 425 | data); |
| 426 | found += 1; |
| 427 | } |
| 428 | |
| 429 | home = getenv("HOME"); |
| 430 | if (perf_config_global() && home) { |
| 431 | char *user_config = strdup(mkpath("%s/.perfconfig", home)); |
| 432 | if (!access(user_config, R_OK)) { |
| 433 | ret += perf_config_from_file(fn, user_config, data); |
| 434 | found += 1; |
| 435 | } |
| 436 | free(user_config); |
| 437 | } |
| 438 | |
| 439 | repo_config = perf_pathdup("config"); |
| 440 | if (!access(repo_config, R_OK)) { |
| 441 | ret += perf_config_from_file(fn, repo_config, data); |
| 442 | found += 1; |
| 443 | } |
| 444 | free(repo_config); |
| 445 | if (found == 0) |
| 446 | return -1; |
| 447 | return ret; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Find all the stuff for perf_config_set() below. |
| 452 | */ |
| 453 | |
| 454 | #define MAX_MATCHES 512 |
| 455 | |
| 456 | static struct { |
| 457 | int baselen; |
| 458 | char* key; |
| 459 | int do_not_match; |
| 460 | regex_t* value_regex; |
| 461 | int multi_replace; |
| 462 | size_t offset[MAX_MATCHES]; |
| 463 | enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state; |
| 464 | int seen; |
| 465 | } store; |
| 466 | |
| 467 | static int matches(const char* key, const char* value) |
| 468 | { |
| 469 | return !strcmp(key, store.key) && |
| 470 | (store.value_regex == NULL || |
| 471 | (store.do_not_match ^ |
| 472 | !regexec(store.value_regex, value, 0, NULL, 0))); |
| 473 | } |
| 474 | |
| 475 | static int store_aux(const char* key, const char* value, void *cb) |
| 476 | { |
| 477 | const char *ep; |
| 478 | size_t section_len; |
| 479 | |
| 480 | switch (store.state) { |
| 481 | case KEY_SEEN: |
| 482 | if (matches(key, value)) { |
| 483 | if (store.seen == 1 && store.multi_replace == 0) { |
| 484 | warning("%s has multiple values", key); |
| 485 | } else if (store.seen >= MAX_MATCHES) { |
| 486 | error("too many matches for %s", key); |
| 487 | return 1; |
| 488 | } |
| 489 | |
| 490 | store.offset[store.seen] = ftell(config_file); |
| 491 | store.seen++; |
| 492 | } |
| 493 | break; |
| 494 | case SECTION_SEEN: |
| 495 | /* |
| 496 | * What we are looking for is in store.key (both |
| 497 | * section and var), and its section part is baselen |
| 498 | * long. We found key (again, both section and var). |
| 499 | * We would want to know if this key is in the same |
| 500 | * section as what we are looking for. We already |
| 501 | * know we are in the same section as what should |
| 502 | * hold store.key. |
| 503 | */ |
| 504 | ep = strrchr(key, '.'); |
| 505 | section_len = ep - key; |
| 506 | |
| 507 | if ((section_len != store.baselen) || |
| 508 | memcmp(key, store.key, section_len+1)) { |
| 509 | store.state = SECTION_END_SEEN; |
| 510 | break; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * Do not increment matches: this is no match, but we |
| 515 | * just made sure we are in the desired section. |
| 516 | */ |
| 517 | store.offset[store.seen] = ftell(config_file); |
| 518 | /* fallthru */ |
| 519 | case SECTION_END_SEEN: |
| 520 | case START: |
| 521 | if (matches(key, value)) { |
| 522 | store.offset[store.seen] = ftell(config_file); |
| 523 | store.state = KEY_SEEN; |
| 524 | store.seen++; |
| 525 | } else { |
| 526 | if (strrchr(key, '.') - key == store.baselen && |
| 527 | !strncmp(key, store.key, store.baselen)) { |
| 528 | store.state = SECTION_SEEN; |
| 529 | store.offset[store.seen] = ftell(config_file); |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static int write_error(const char *filename) |
| 537 | { |
| 538 | error("failed to write new configuration file %s", filename); |
| 539 | |
| 540 | /* Same error code as "failed to rename". */ |
| 541 | return 4; |
| 542 | } |
| 543 | |
| 544 | static int store_write_section(int fd, const char* key) |
| 545 | { |
| 546 | const char *dot; |
| 547 | int i, success; |
| 548 | struct strbuf sb = STRBUF_INIT; |
| 549 | |
| 550 | dot = memchr(key, '.', store.baselen); |
| 551 | if (dot) { |
| 552 | strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key); |
| 553 | for (i = dot - key + 1; i < store.baselen; i++) { |
| 554 | if (key[i] == '"' || key[i] == '\\') |
| 555 | strbuf_addch(&sb, '\\'); |
| 556 | strbuf_addch(&sb, key[i]); |
| 557 | } |
| 558 | strbuf_addstr(&sb, "\"]\n"); |
| 559 | } else { |
| 560 | strbuf_addf(&sb, "[%.*s]\n", store.baselen, key); |
| 561 | } |
| 562 | |
| 563 | success = write_in_full(fd, sb.buf, sb.len) == sb.len; |
| 564 | strbuf_release(&sb); |
| 565 | |
| 566 | return success; |
| 567 | } |
| 568 | |
| 569 | static int store_write_pair(int fd, const char* key, const char* value) |
| 570 | { |
| 571 | int i, success; |
| 572 | int length = strlen(key + store.baselen + 1); |
| 573 | const char *quote = ""; |
| 574 | struct strbuf sb = STRBUF_INIT; |
| 575 | |
| 576 | /* |
| 577 | * Check to see if the value needs to be surrounded with a dq pair. |
| 578 | * Note that problematic characters are always backslash-quoted; this |
| 579 | * check is about not losing leading or trailing SP and strings that |
| 580 | * follow beginning-of-comment characters (i.e. ';' and '#') by the |
| 581 | * configuration parser. |
| 582 | */ |
| 583 | if (value[0] == ' ') |
| 584 | quote = "\""; |
| 585 | for (i = 0; value[i]; i++) |
| 586 | if (value[i] == ';' || value[i] == '#') |
| 587 | quote = "\""; |
| 588 | if (i && value[i - 1] == ' ') |
| 589 | quote = "\""; |
| 590 | |
| 591 | strbuf_addf(&sb, "\t%.*s = %s", |
| 592 | length, key + store.baselen + 1, quote); |
| 593 | |
| 594 | for (i = 0; value[i]; i++) |
| 595 | switch (value[i]) { |
| 596 | case '\n': |
| 597 | strbuf_addstr(&sb, "\\n"); |
| 598 | break; |
| 599 | case '\t': |
| 600 | strbuf_addstr(&sb, "\\t"); |
| 601 | break; |
| 602 | case '"': |
| 603 | case '\\': |
| 604 | strbuf_addch(&sb, '\\'); |
| 605 | default: |
| 606 | strbuf_addch(&sb, value[i]); |
| 607 | break; |
| 608 | } |
| 609 | strbuf_addf(&sb, "%s\n", quote); |
| 610 | |
| 611 | success = write_in_full(fd, sb.buf, sb.len) == sb.len; |
| 612 | strbuf_release(&sb); |
| 613 | |
| 614 | return success; |
| 615 | } |
| 616 | |
| 617 | static ssize_t find_beginning_of_line(const char* contents, size_t size, |
| 618 | size_t offset_, int* found_bracket) |
| 619 | { |
| 620 | size_t equal_offset = size, bracket_offset = size; |
| 621 | ssize_t offset; |
| 622 | |
| 623 | contline: |
| 624 | for (offset = offset_-2; offset > 0 |
| 625 | && contents[offset] != '\n'; offset--) |
| 626 | switch (contents[offset]) { |
| 627 | case '=': equal_offset = offset; break; |
| 628 | case ']': bracket_offset = offset; break; |
| 629 | } |
| 630 | if (offset > 0 && contents[offset-1] == '\\') { |
| 631 | offset_ = offset; |
| 632 | goto contline; |
| 633 | } |
| 634 | if (bracket_offset < equal_offset) { |
| 635 | *found_bracket = 1; |
| 636 | offset = bracket_offset+1; |
| 637 | } else |
| 638 | offset++; |
| 639 | |
| 640 | return offset; |
| 641 | } |
| 642 | |
| 643 | int perf_config_set(const char* key, const char* value) |
| 644 | { |
| 645 | return perf_config_set_multivar(key, value, NULL, 0); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * If value==NULL, unset in (remove from) config, |
| 650 | * if value_regex!=NULL, disregard key/value pairs where value does not match. |
| 651 | * if multi_replace==0, nothing, or only one matching key/value is replaced, |
| 652 | * else all matching key/values (regardless how many) are removed, |
| 653 | * before the new pair is written. |
| 654 | * |
| 655 | * Returns 0 on success. |
| 656 | * |
| 657 | * This function does this: |
| 658 | * |
| 659 | * - it locks the config file by creating ".perf/config.lock" |
| 660 | * |
| 661 | * - it then parses the config using store_aux() as validator to find |
| 662 | * the position on the key/value pair to replace. If it is to be unset, |
| 663 | * it must be found exactly once. |
| 664 | * |
| 665 | * - the config file is mmap()ed and the part before the match (if any) is |
| 666 | * written to the lock file, then the changed part and the rest. |
| 667 | * |
| 668 | * - the config file is removed and the lock file rename()d to it. |
| 669 | * |
| 670 | */ |
| 671 | int perf_config_set_multivar(const char* key, const char* value, |
| 672 | const char* value_regex, int multi_replace) |
| 673 | { |
| 674 | int i, dot; |
| 675 | int fd = -1, in_fd; |
| 676 | int ret; |
| 677 | char* config_filename; |
| 678 | const char* last_dot = strrchr(key, '.'); |
| 679 | |
| 680 | if (config_exclusive_filename) |
| 681 | config_filename = strdup(config_exclusive_filename); |
| 682 | else |
| 683 | config_filename = perf_pathdup("config"); |
| 684 | |
| 685 | /* |
| 686 | * Since "key" actually contains the section name and the real |
| 687 | * key name separated by a dot, we have to know where the dot is. |
| 688 | */ |
| 689 | |
| 690 | if (last_dot == NULL) { |
| 691 | error("key does not contain a section: %s", key); |
| 692 | ret = 2; |
| 693 | goto out_free; |
| 694 | } |
| 695 | store.baselen = last_dot - key; |
| 696 | |
| 697 | store.multi_replace = multi_replace; |
| 698 | |
| 699 | /* |
| 700 | * Validate the key and while at it, lower case it for matching. |
| 701 | */ |
| 702 | store.key = malloc(strlen(key) + 1); |
| 703 | dot = 0; |
| 704 | for (i = 0; key[i]; i++) { |
| 705 | unsigned char c = key[i]; |
| 706 | if (c == '.') |
| 707 | dot = 1; |
| 708 | /* Leave the extended basename untouched.. */ |
| 709 | if (!dot || i > store.baselen) { |
| 710 | if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) { |
| 711 | error("invalid key: %s", key); |
| 712 | free(store.key); |
| 713 | ret = 1; |
| 714 | goto out_free; |
| 715 | } |
| 716 | c = tolower(c); |
| 717 | } else if (c == '\n') { |
| 718 | error("invalid key (newline): %s", key); |
| 719 | free(store.key); |
| 720 | ret = 1; |
| 721 | goto out_free; |
| 722 | } |
| 723 | store.key[i] = c; |
| 724 | } |
| 725 | store.key[i] = 0; |
| 726 | |
| 727 | /* |
| 728 | * If .perf/config does not exist yet, write a minimal version. |
| 729 | */ |
| 730 | in_fd = open(config_filename, O_RDONLY); |
| 731 | if ( in_fd < 0 ) { |
| 732 | free(store.key); |
| 733 | |
| 734 | if ( ENOENT != errno ) { |
| 735 | error("opening %s: %s", config_filename, |
| 736 | strerror(errno)); |
| 737 | ret = 3; /* same as "invalid config file" */ |
| 738 | goto out_free; |
| 739 | } |
| 740 | /* if nothing to unset, error out */ |
| 741 | if (value == NULL) { |
| 742 | ret = 5; |
| 743 | goto out_free; |
| 744 | } |
| 745 | |
| 746 | store.key = (char*)key; |
| 747 | if (!store_write_section(fd, key) || |
| 748 | !store_write_pair(fd, key, value)) |
| 749 | goto write_err_out; |
| 750 | } else { |
| 751 | struct stat st; |
| 752 | char* contents; |
| 753 | size_t contents_sz, copy_begin, copy_end; |
| 754 | int i, new_line = 0; |
| 755 | |
| 756 | if (value_regex == NULL) |
| 757 | store.value_regex = NULL; |
| 758 | else { |
| 759 | if (value_regex[0] == '!') { |
| 760 | store.do_not_match = 1; |
| 761 | value_regex++; |
| 762 | } else |
| 763 | store.do_not_match = 0; |
| 764 | |
| 765 | store.value_regex = (regex_t*)malloc(sizeof(regex_t)); |
| 766 | if (regcomp(store.value_regex, value_regex, |
| 767 | REG_EXTENDED)) { |
| 768 | error("invalid pattern: %s", value_regex); |
| 769 | free(store.value_regex); |
| 770 | ret = 6; |
| 771 | goto out_free; |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | store.offset[0] = 0; |
| 776 | store.state = START; |
| 777 | store.seen = 0; |
| 778 | |
| 779 | /* |
| 780 | * After this, store.offset will contain the *end* offset |
| 781 | * of the last match, or remain at 0 if no match was found. |
| 782 | * As a side effect, we make sure to transform only a valid |
| 783 | * existing config file. |
| 784 | */ |
| 785 | if (perf_config_from_file(store_aux, config_filename, NULL)) { |
| 786 | error("invalid config file %s", config_filename); |
| 787 | free(store.key); |
| 788 | if (store.value_regex != NULL) { |
| 789 | regfree(store.value_regex); |
| 790 | free(store.value_regex); |
| 791 | } |
| 792 | ret = 3; |
| 793 | goto out_free; |
| 794 | } |
| 795 | |
| 796 | free(store.key); |
| 797 | if (store.value_regex != NULL) { |
| 798 | regfree(store.value_regex); |
| 799 | free(store.value_regex); |
| 800 | } |
| 801 | |
| 802 | /* if nothing to unset, or too many matches, error out */ |
| 803 | if ((store.seen == 0 && value == NULL) || |
| 804 | (store.seen > 1 && multi_replace == 0)) { |
| 805 | ret = 5; |
| 806 | goto out_free; |
| 807 | } |
| 808 | |
| 809 | fstat(in_fd, &st); |
| 810 | contents_sz = xsize_t(st.st_size); |
| 811 | contents = mmap(NULL, contents_sz, PROT_READ, |
| 812 | MAP_PRIVATE, in_fd, 0); |
| 813 | close(in_fd); |
| 814 | |
| 815 | if (store.seen == 0) |
| 816 | store.seen = 1; |
| 817 | |
| 818 | for (i = 0, copy_begin = 0; i < store.seen; i++) { |
| 819 | if (store.offset[i] == 0) { |
| 820 | store.offset[i] = copy_end = contents_sz; |
| 821 | } else if (store.state != KEY_SEEN) { |
| 822 | copy_end = store.offset[i]; |
| 823 | } else |
| 824 | copy_end = find_beginning_of_line( |
| 825 | contents, contents_sz, |
| 826 | store.offset[i]-2, &new_line); |
| 827 | |
| 828 | if (copy_end > 0 && contents[copy_end-1] != '\n') |
| 829 | new_line = 1; |
| 830 | |
| 831 | /* write the first part of the config */ |
| 832 | if (copy_end > copy_begin) { |
| 833 | if (write_in_full(fd, contents + copy_begin, |
| 834 | copy_end - copy_begin) < |
| 835 | copy_end - copy_begin) |
| 836 | goto write_err_out; |
| 837 | if (new_line && |
| 838 | write_in_full(fd, "\n", 1) != 1) |
| 839 | goto write_err_out; |
| 840 | } |
| 841 | copy_begin = store.offset[i]; |
| 842 | } |
| 843 | |
| 844 | /* write the pair (value == NULL means unset) */ |
| 845 | if (value != NULL) { |
| 846 | if (store.state == START) { |
| 847 | if (!store_write_section(fd, key)) |
| 848 | goto write_err_out; |
| 849 | } |
| 850 | if (!store_write_pair(fd, key, value)) |
| 851 | goto write_err_out; |
| 852 | } |
| 853 | |
| 854 | /* write the rest of the config */ |
| 855 | if (copy_begin < contents_sz) |
| 856 | if (write_in_full(fd, contents + copy_begin, |
| 857 | contents_sz - copy_begin) < |
| 858 | contents_sz - copy_begin) |
| 859 | goto write_err_out; |
| 860 | |
| 861 | munmap(contents, contents_sz); |
| 862 | } |
| 863 | |
| 864 | ret = 0; |
| 865 | |
| 866 | out_free: |
| 867 | free(config_filename); |
| 868 | return ret; |
| 869 | |
| 870 | write_err_out: |
| 871 | goto out_free; |
| 872 | |
| 873 | } |
| 874 | |
| 875 | static int section_name_match (const char *buf, const char *name) |
| 876 | { |
| 877 | int i = 0, j = 0, dot = 0; |
| 878 | for (; buf[i] && buf[i] != ']'; i++) { |
| 879 | if (!dot && isspace(buf[i])) { |
| 880 | dot = 1; |
| 881 | if (name[j++] != '.') |
| 882 | break; |
| 883 | for (i++; isspace(buf[i]); i++) |
| 884 | ; /* do nothing */ |
| 885 | if (buf[i] != '"') |
| 886 | break; |
| 887 | continue; |
| 888 | } |
| 889 | if (buf[i] == '\\' && dot) |
| 890 | i++; |
| 891 | else if (buf[i] == '"' && dot) { |
| 892 | for (i++; isspace(buf[i]); i++) |
| 893 | ; /* do_nothing */ |
| 894 | break; |
| 895 | } |
| 896 | if (buf[i] != name[j++]) |
| 897 | break; |
| 898 | } |
| 899 | return (buf[i] == ']' && name[j] == 0); |
| 900 | } |
| 901 | |
| 902 | /* if new_name == NULL, the section is removed instead */ |
| 903 | int perf_config_rename_section(const char *old_name, const char *new_name) |
| 904 | { |
| 905 | int ret = 0, remove = 0; |
| 906 | char *config_filename; |
| 907 | int out_fd; |
| 908 | char buf[1024]; |
| 909 | |
| 910 | if (config_exclusive_filename) |
| 911 | config_filename = strdup(config_exclusive_filename); |
| 912 | else |
| 913 | config_filename = perf_pathdup("config"); |
| 914 | if (out_fd < 0) { |
| 915 | ret = error("could not lock config file %s", config_filename); |
| 916 | goto out; |
| 917 | } |
| 918 | |
| 919 | if (!(config_file = fopen(config_filename, "rb"))) { |
| 920 | /* no config file means nothing to rename, no error */ |
| 921 | goto unlock_and_out; |
| 922 | } |
| 923 | |
| 924 | while (fgets(buf, sizeof(buf), config_file)) { |
| 925 | int i; |
| 926 | int length; |
| 927 | for (i = 0; buf[i] && isspace(buf[i]); i++) |
| 928 | ; /* do nothing */ |
| 929 | if (buf[i] == '[') { |
| 930 | /* it's a section */ |
| 931 | if (section_name_match (&buf[i+1], old_name)) { |
| 932 | ret++; |
| 933 | if (new_name == NULL) { |
| 934 | remove = 1; |
| 935 | continue; |
| 936 | } |
| 937 | store.baselen = strlen(new_name); |
| 938 | if (!store_write_section(out_fd, new_name)) { |
| 939 | goto out; |
| 940 | } |
| 941 | continue; |
| 942 | } |
| 943 | remove = 0; |
| 944 | } |
| 945 | if (remove) |
| 946 | continue; |
| 947 | length = strlen(buf); |
| 948 | if (write_in_full(out_fd, buf, length) != length) { |
| 949 | goto out; |
| 950 | } |
| 951 | } |
| 952 | fclose(config_file); |
| 953 | unlock_and_out: |
| 954 | out: |
| 955 | free(config_filename); |
| 956 | return ret; |
| 957 | } |
| 958 | |
| 959 | /* |
| 960 | * Call this to report error for your variable that should not |
| 961 | * get a boolean value (i.e. "[my] var" means "true"). |
| 962 | */ |
| 963 | int config_error_nonbool(const char *var) |
| 964 | { |
| 965 | return error("Missing value for '%s'", var); |
| 966 | } |