pathspec.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "abspath.h"
   5 #include "parse.h"
   6 #include "dir.h"
   7 #include "environment.h"
   8 #include "gettext.h"
   9 #include "pathspec.h"
  10 #include "attr.h"
  11 #include "read-cache.h"
  12 #include "repository.h"
  13 #include "setup.h"
  14 #include "strvec.h"
  15 #include "symlinks.h"
  16 #include "quote.h"
  17 #include "wildmatch.h"
  18
  19 /*
  20  * Finds which of the given pathspecs match items in the index.
  21  *
  22  * For each pathspec, sets the corresponding entry in the seen[] array
  23  * (which should be specs items long, i.e. the same size as pathspec)
  24  * to the nature of the "closest" (i.e. most specific) match found for
  25  * that pathspec in the index, if it was a closer type of match than
  26  * the existing entry.  As an optimization, matching is skipped
  27  * altogether if seen[] already only contains non-zero entries.
  28  *
  29  * If seen[] has not already been written to, it may make sense
  30  * to use find_pathspecs_matching_against_index() instead.
  31  */
  32 void add_pathspec_matches_against_index(const struct pathspec *pathspec,
  33                                         struct index_state *istate,
  34                                         char *seen,
  35                                         enum ps_skip_worktree_action sw_action)
  36 {
  37         int num_unmatched = 0;
  38
  39         /*
  40          * Since we are walking the index as if we were walking the directory,
  41          * we have to mark the matched pathspec as seen; otherwise we will
  42          * mistakenly think that the user gave a pathspec that did not match
  43          * anything.
  44          */
  45         for (int i = 0; i < pathspec->nr; i++)
  46                 if (!seen[i])
  47                         num_unmatched++;
  48         if (!num_unmatched)
  49                 return;
  50         for (unsigned int i = 0; i < istate->cache_nr; i++) {
  51                 const struct cache_entry *ce = istate->cache[i];
  52                 if (sw_action == PS_IGNORE_SKIP_WORKTREE &&
  53                     (ce_skip_worktree(ce) || !path_in_sparse_checkout(ce->name, istate)))
  54                         continue;
  55                 ce_path_match(istate, ce, pathspec, seen);
  56         }
  57 }
  58
  59 /*
  60  * Finds which of the given pathspecs match items in the index.
  61  *
  62  * This is a one-shot wrapper around add_pathspec_matches_against_index()
  63  * which allocates, populates, and returns a seen[] array indicating the
  64  * nature of the "closest" (i.e. most specific) matches which each of the
  65  * given pathspecs achieves against all items in the index.
  66  */
  67 char *find_pathspecs_matching_against_index(const struct pathspec *pathspec,
  68                                             struct index_state *istate,
  69                                             enum ps_skip_worktree_action sw_action)
  70 {
  71         char *seen = xcalloc(pathspec->nr, 1);
  72         add_pathspec_matches_against_index(pathspec, istate, seen, sw_action);
  73         return seen;
  74 }
  75
  76 char *find_pathspecs_matching_skip_worktree(const struct pathspec *pathspec)
  77 {
  78         struct index_state *istate = the_repository->index;
  79         char *seen = xcalloc(pathspec->nr, 1);
  80         unsigned int i;
  81
  82         for (i = 0; i < istate->cache_nr; i++) {
  83                 struct cache_entry *ce = istate->cache[i];
  84                 if (ce_skip_worktree(ce) || !path_in_sparse_checkout(ce->name, istate))
  85                     ce_path_match(istate, ce, pathspec, seen);
  86         }
  87
  88         return seen;
  89 }
  90
  91 /*
  92  * Magic pathspec
  93  *
  94  * Possible future magic semantics include stuff like:
  95  *
  96  *      { PATHSPEC_RECURSIVE, '*', "recursive" },
  97  *      { PATHSPEC_REGEXP, '\0', "regexp" },
  98  *
  99  */
 100
 101 static struct pathspec_magic {
 102         unsigned bit;
 103         char mnemonic; /* this cannot be ':'! */
 104         const char *name;
 105 } pathspec_magic[] = {
 106         { PATHSPEC_FROMTOP,  '/', "top" },
 107         { PATHSPEC_LITERAL, '\0', "literal" },
 108         { PATHSPEC_GLOB,    '\0', "glob" },
 109         { PATHSPEC_ICASE,   '\0', "icase" },
 110         { PATHSPEC_EXCLUDE,  '!', "exclude" },
 111         { PATHSPEC_ATTR,    '\0', "attr" },
 112 };
 113
 114 static void prefix_magic(struct strbuf *sb, int prefixlen,
 115                          unsigned magic, const char *element)
 116 {
 117         /* No magic was found in element, just add prefix magic */
 118         if (!magic) {
 119                 strbuf_addf(sb, ":(prefix:%d)", prefixlen);
 120                 return;
 121         }
 122
 123         /*
 124          * At this point, we know that parse_element_magic() was able
 125          * to extract some pathspec magic from element. So we know
 126          * element is correctly formatted in either shorthand or
 127          * longhand form
 128          */
 129         if (element[1] != '(') {
 130                 /* Process an element in shorthand form (e.g. ":!/<match>") */
 131                 strbuf_addstr(sb, ":(");
 132                 for (unsigned int i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 133                         if ((magic & pathspec_magic[i].bit) &&
 134                             pathspec_magic[i].mnemonic) {
 135                                 if (sb->buf[sb->len - 1] != '(')
 136                                         strbuf_addch(sb, ',');
 137                                 strbuf_addstr(sb, pathspec_magic[i].name);
 138                         }
 139                 }
 140         } else {
 141                 /* For the longhand form, we copy everything up to the final ')' */
 142                 size_t len = strchr(element, ')') - element;
 143                 strbuf_add(sb, element, len);
 144         }
 145         strbuf_addf(sb, ",prefix:%d)", prefixlen);
 146 }
 147
 148 static size_t strcspn_escaped(const char *s, const char *stop)
 149 {
 150         const char *i;
 151
 152         for (i = s; *i; i++) {
 153                 /* skip the escaped character */
 154                 if (i[0] == '\\' && i[1]) {
 155                         i++;
 156                         continue;
 157                 }
 158
 159                 if (strchr(stop, *i))
 160                         break;
 161         }
 162         return i - s;
 163 }
 164
 165 static inline int invalid_value_char(const char ch)
 166 {
 167         if (isalnum(ch) || strchr(",-_", ch))
 168                 return 0;
 169         return -1;
 170 }
 171
 172 static char *attr_value_unescape(const char *value)
 173 {
 174         const char *src;
 175         char *dst, *ret;
 176
 177         ret = xmallocz(strlen(value));
 178         for (src = value, dst = ret; *src; src++, dst++) {
 179                 if (*src == '\\') {
 180                         if (!src[1])
 181                                 die(_("Escape character '\\' not allowed as "
 182                                       "last character in attr value"));
 183                         src++;
 184                 }
 185                 if (invalid_value_char(*src))
 186                         die("cannot use '%c' for value matching", *src);
 187                 *dst = *src;
 188         }
 189         *dst = '\0';
 190         return ret;
 191 }
 192
 193 static void parse_pathspec_attr_match(struct pathspec_item *item, const char *value)
 194 {
 195         struct string_list_item *si;
 196         struct string_list list = STRING_LIST_INIT_DUP;
 197
 198         if (item->attr_check || item->attr_match)
 199                 die(_("Only one 'attr:' specification is allowed."));
 200
 201         if (!value || !*value)
 202                 die(_("attr spec must not be empty"));
 203
 204         string_list_split(&list, value, ' ', -1);
 205         string_list_remove_empty_items(&list, 0);
 206
 207         item->attr_check = attr_check_alloc();
 208         CALLOC_ARRAY(item->attr_match, list.nr);
 209
 210         for_each_string_list_item(si, &list) {
 211                 size_t attr_len;
 212                 char *attr_name;
 213                 const struct git_attr *a;
 214
 215                 int j = item->attr_match_nr++;
 216                 const char *attr = si->string;
 217                 struct attr_match *am = &item->attr_match[j];
 218
 219                 switch (*attr) {
 220                 case '!':
 221                         am->match_mode = MATCH_UNSPECIFIED;
 222                         attr++;
 223                         attr_len = strlen(attr);
 224                         break;
 225                 case '-':
 226                         am->match_mode = MATCH_UNSET;
 227                         attr++;
 228                         attr_len = strlen(attr);
 229                         break;
 230                 default:
 231                         attr_len = strcspn(attr, "=");
 232                         if (attr[attr_len] != '=')
 233                                 am->match_mode = MATCH_SET;
 234                         else {
 235                                 const char *v = &attr[attr_len + 1];
 236                                 am->match_mode = MATCH_VALUE;
 237                                 am->value = attr_value_unescape(v);
 238                         }
 239                         break;
 240                 }
 241
 242                 attr_name = xmemdupz(attr, attr_len);
 243                 a = git_attr(attr_name);
 244                 if (!a)
 245                         die(_("invalid attribute name %s"), attr_name);
 246
 247                 attr_check_append(item->attr_check, a);
 248
 249                 free(attr_name);
 250         }
 251
 252         if (item->attr_check->nr != item->attr_match_nr)
 253                 BUG("should have same number of entries");
 254
 255         string_list_clear(&list, 0);
 256 }
 257
 258 static inline int get_literal_global(void)
 259 {
 260         static int literal = -1;
 261
 262         if (literal < 0)
 263                 literal = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0);
 264
 265         return literal;
 266 }
 267
 268 static inline int get_glob_global(void)
 269 {
 270         static int glob = -1;
 271
 272         if (glob < 0)
 273                 glob = git_env_bool(GIT_GLOB_PATHSPECS_ENVIRONMENT, 0);
 274
 275         return glob;
 276 }
 277
 278 static inline int get_noglob_global(void)
 279 {
 280         static int noglob = -1;
 281
 282         if (noglob < 0)
 283                 noglob = git_env_bool(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, 0);
 284
 285         return noglob;
 286 }
 287
 288 static inline int get_icase_global(void)
 289 {
 290         static int icase = -1;
 291
 292         if (icase < 0)
 293                 icase = git_env_bool(GIT_ICASE_PATHSPECS_ENVIRONMENT, 0);
 294
 295         return icase;
 296 }
 297
 298 static int get_global_magic(int element_magic)
 299 {
 300         int global_magic = 0;
 301
 302         if (get_literal_global())
 303                 global_magic |= PATHSPEC_LITERAL;
 304
 305         /* --glob-pathspec is overridden by :(literal) */
 306         if (get_glob_global() && !(element_magic & PATHSPEC_LITERAL))
 307                 global_magic |= PATHSPEC_GLOB;
 308
 309         if (get_glob_global() && get_noglob_global())
 310                 die(_("global 'glob' and 'noglob' pathspec settings are incompatible"));
 311
 312         if (get_icase_global())
 313                 global_magic |= PATHSPEC_ICASE;
 314
 315         if ((global_magic & PATHSPEC_LITERAL) &&
 316             (global_magic & ~PATHSPEC_LITERAL))
 317                 die(_("global 'literal' pathspec setting is incompatible "
 318                       "with all other global pathspec settings"));
 319
 320         /* --noglob-pathspec adds :(literal) _unless_ :(glob) is specified */
 321         if (get_noglob_global() && !(element_magic & PATHSPEC_GLOB))
 322                 global_magic |= PATHSPEC_LITERAL;
 323
 324         return global_magic;
 325 }
 326
 327 /*
 328  * Parse the pathspec element looking for long magic
 329  *
 330  * saves all magic in 'magic'
 331  * if prefix magic is used, save the prefix length in 'prefix_len'
 332  * returns the position in 'elem' after all magic has been parsed
 333  */
 334 static const char *parse_long_magic(unsigned *magic, int *prefix_len,
 335                                     struct pathspec_item *item,
 336                                     const char *elem)
 337 {
 338         const char *pos;
 339         const char *nextat;
 340
 341         for (pos = elem + 2; *pos && *pos != ')'; pos = nextat) {
 342                 size_t len = strcspn_escaped(pos, ",)");
 343                 unsigned int i;
 344
 345                 if (pos[len] == ',')
 346                         nextat = pos + len + 1; /* handle ',' */
 347                 else
 348                         nextat = pos + len; /* handle ')' and '\0' */
 349
 350                 if (!len)
 351                         continue;
 352
 353                 if (starts_with(pos, "prefix:")) {
 354                         char *endptr;
 355                         *prefix_len = strtol(pos + 7, &endptr, 10);
 356                         if ((size_t)(endptr - pos) != len)
 357                                 die(_("invalid parameter for pathspec magic 'prefix'"));
 358                         continue;
 359                 }
 360
 361                 if (starts_with(pos, "attr:")) {
 362                         char *attr_body = xmemdupz(pos + 5, len - 5);
 363                         parse_pathspec_attr_match(item, attr_body);
 364                         *magic |= PATHSPEC_ATTR;
 365                         free(attr_body);
 366                         continue;
 367                 }
 368
 369                 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 370                         if (strlen(pathspec_magic[i].name) == len &&
 371                             !strncmp(pathspec_magic[i].name, pos, len)) {
 372                                 *magic |= pathspec_magic[i].bit;
 373                                 break;
 374                         }
 375                 }
 376
 377                 if (ARRAY_SIZE(pathspec_magic) <= i)
 378                         die(_("Invalid pathspec magic '%.*s' in '%s'"),
 379                             (int) len, pos, elem);
 380         }
 381
 382         if (*pos != ')')
 383                 die(_("Missing ')' at the end of pathspec magic in '%s'"),
 384                     elem);
 385         pos++;
 386
 387         return pos;
 388 }
 389
 390 /*
 391  * Parse the pathspec element looking for short magic
 392  *
 393  * saves all magic in 'magic'
 394  * returns the position in 'elem' after all magic has been parsed
 395  */
 396 static const char *parse_short_magic(unsigned *magic, const char *elem)
 397 {
 398         const char *pos;
 399
 400         for (pos = elem + 1; *pos && *pos != ':'; pos++) {
 401                 char ch = *pos;
 402                 unsigned int i;
 403
 404                 /* Special case alias for '!' */
 405                 if (ch == '^') {
 406                         *magic |= PATHSPEC_EXCLUDE;
 407                         continue;
 408                 }
 409
 410                 if (!is_pathspec_magic(ch))
 411                         break;
 412
 413                 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 414                         if (pathspec_magic[i].mnemonic == ch) {
 415                                 *magic |= pathspec_magic[i].bit;
 416                                 break;
 417                         }
 418                 }
 419
 420                 if (ARRAY_SIZE(pathspec_magic) <= i)
 421                         die(_("Unimplemented pathspec magic '%c' in '%s'"),
 422                             ch, elem);
 423         }
 424
 425         if (*pos == ':')
 426                 pos++;
 427
 428         return pos;
 429 }
 430
 431 static const char *parse_element_magic(unsigned *magic, int *prefix_len,
 432                                        struct pathspec_item *item,
 433                                        const char *elem)
 434 {
 435         if (elem[0] != ':' || get_literal_global())
 436                 return elem; /* nothing to do */
 437         else if (elem[1] == '(')
 438                 /* longhand */
 439                 return parse_long_magic(magic, prefix_len, item, elem);
 440         else
 441                 /* shorthand */
 442                 return parse_short_magic(magic, elem);
 443 }
 444
 445 /*
 446  * Perform the initialization of a pathspec_item based on a pathspec element.
 447  */
 448 static void init_pathspec_item(struct pathspec_item *item, unsigned flags,
 449                                const char *prefix, int prefixlen,
 450                                const char *elt)
 451 {
 452         unsigned magic = 0, element_magic = 0;
 453         const char *copyfrom = elt;
 454         char *match;
 455         int pathspec_prefix = -1;
 456
 457         item->attr_check = NULL;
 458         item->attr_match = NULL;
 459         item->attr_match_nr = 0;
 460
 461         /* PATHSPEC_LITERAL_PATH ignores magic */
 462         if (flags & PATHSPEC_LITERAL_PATH) {
 463                 magic = PATHSPEC_LITERAL;
 464         } else {
 465                 copyfrom = parse_element_magic(&element_magic,
 466                                                &pathspec_prefix,
 467                                                item,
 468                                                elt);
 469                 magic |= element_magic;
 470                 magic |= get_global_magic(element_magic);
 471         }
 472
 473         item->magic = magic;
 474
 475         if (pathspec_prefix >= 0 &&
 476             (prefixlen || (prefix && *prefix)))
 477                 BUG("'prefix' magic is supposed to be used at worktree's root");
 478
 479         if ((magic & PATHSPEC_LITERAL) && (magic & PATHSPEC_GLOB))
 480                 die(_("%s: 'literal' and 'glob' are incompatible"), elt);
 481
 482         /* Create match string which will be used for pathspec matching */
 483         if (pathspec_prefix >= 0) {
 484                 match = xstrdup(copyfrom);
 485                 prefixlen = pathspec_prefix;
 486         } else if (magic & PATHSPEC_FROMTOP) {
 487                 match = xstrdup(copyfrom);
 488                 prefixlen = 0;
 489         } else {
 490                 match = prefix_path_gently(prefix, prefixlen,
 491                                            &prefixlen, copyfrom);
 492                 if (!match) {
 493                         const char *hint_path;
 494
 495                         if ((flags & PATHSPEC_NO_REPOSITORY) || !have_git_dir())
 496                                 die(_("'%s' is outside the directory tree"),
 497                                     copyfrom);
 498                         hint_path = repo_get_work_tree(the_repository);
 499                         if (!hint_path)
 500                                 hint_path = repo_get_git_dir(the_repository);
 501                         die(_("%s: '%s' is outside repository at '%s'"), elt,
 502                             copyfrom, absolute_path(hint_path));
 503                 }
 504         }
 505
 506         item->match = match;
 507         item->len = strlen(item->match);
 508         item->prefix = prefixlen;
 509
 510         /*
 511          * Prefix the pathspec (keep all magic) and assign to
 512          * original. Useful for passing to another command.
 513          */
 514         if ((flags & PATHSPEC_PREFIX_ORIGIN) &&
 515             !get_literal_global()) {
 516                 struct strbuf sb = STRBUF_INIT;
 517
 518                 /* Preserve the actual prefix length of each pattern */
 519                 prefix_magic(&sb, prefixlen, element_magic, elt);
 520
 521                 strbuf_addstr(&sb, match);
 522                 item->original = strbuf_detach(&sb, NULL);
 523         } else {
 524                 item->original = xstrdup(elt);
 525         }
 526
 527         if (magic & PATHSPEC_LITERAL) {
 528                 item->nowildcard_len = item->len;
 529         } else {
 530                 item->nowildcard_len = simple_length(item->match);
 531                 if (item->nowildcard_len < prefixlen)
 532                         item->nowildcard_len = prefixlen;
 533         }
 534
 535         item->flags = 0;
 536         if (magic & PATHSPEC_GLOB) {
 537                 /*
 538                  * FIXME: should we enable ONESTAR in _GLOB for
 539                  * pattern "* * / * . c"?
 540                  */
 541         } else {
 542                 if (item->nowildcard_len < item->len &&
 543                     item->match[item->nowildcard_len] == '*' &&
 544                     no_wildcard(item->match + item->nowildcard_len + 1))
 545                         item->flags |= PATHSPEC_ONESTAR;
 546         }
 547
 548         /* sanity checks, pathspec matchers assume these are sane */
 549         if (item->nowildcard_len > item->len ||
 550             item->prefix         > item->len) {
 551                 BUG("error initializing pathspec_item");
 552         }
 553 }
 554
 555 static int pathspec_item_cmp(const void *a_, const void *b_)
 556 {
 557         struct pathspec_item *a, *b;
 558
 559         a = (struct pathspec_item *)a_;
 560         b = (struct pathspec_item *)b_;
 561         return strcmp(a->match, b->match);
 562 }
 563
 564 void pathspec_magic_names(unsigned magic, struct strbuf *out)
 565 {
 566         unsigned int i;
 567         for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 568                 const struct pathspec_magic *m = pathspec_magic + i;
 569                 if (!(magic & m->bit))
 570                         continue;
 571                 if (out->len)
 572                         strbuf_addstr(out, ", ");
 573
 574                 if (m->mnemonic)
 575                         strbuf_addf(out, _("'%s' (mnemonic: '%c')"),
 576                                     m->name, m->mnemonic);
 577                 else
 578                         strbuf_addf(out, "'%s'", m->name);
 579         }
 580 }
 581
 582 static void NORETURN unsupported_magic(const char *pattern,
 583                                        unsigned magic)
 584 {
 585         struct strbuf sb = STRBUF_INIT;
 586         pathspec_magic_names(magic, &sb);
 587         /*
 588          * We may want to substitute "this command" with a command
 589          * name. E.g. when "git add -p" or "git add -i" dies when running
 590          * "checkout -p"
 591          */
 592         die(_("%s: pathspec magic not supported by this command: %s"),
 593             pattern, sb.buf);
 594 }
 595
 596 void parse_pathspec(struct pathspec *pathspec,
 597                     unsigned magic_mask, unsigned flags,
 598                     const char *prefix, const char **argv)
 599 {
 600         struct pathspec_item *item;
 601         const char *entry = argv ? *argv : NULL;
 602         int i, n, prefixlen, nr_exclude = 0;
 603
 604         memset(pathspec, 0, sizeof(*pathspec));
 605
 606         if (flags & PATHSPEC_MAXDEPTH_VALID)
 607                 pathspec->magic |= PATHSPEC_MAXDEPTH;
 608
 609         /* No arguments, no prefix -> no pathspec */
 610         if (!entry && !prefix)
 611                 return;
 612
 613         if ((flags & PATHSPEC_PREFER_CWD) &&
 614             (flags & PATHSPEC_PREFER_FULL))
 615                 BUG("PATHSPEC_PREFER_CWD and PATHSPEC_PREFER_FULL are incompatible");
 616
 617         if ((flags & PATHSPEC_NO_REPOSITORY) &&
 618             (~magic_mask & (PATHSPEC_ATTR | PATHSPEC_FROMTOP)))
 619                 BUG("PATHSPEC_NO_REPOSITORY is incompatible with PATHSPEC_ATTR and PATHSPEC_FROMTOP");
 620
 621         /* No arguments with prefix -> prefix pathspec */
 622         if (!entry) {
 623                 if (flags & PATHSPEC_PREFER_FULL)
 624                         return;
 625
 626                 if (!(flags & PATHSPEC_PREFER_CWD))
 627                         BUG("PATHSPEC_PREFER_CWD requires arguments");
 628
 629                 pathspec->items = CALLOC_ARRAY(item, 1);
 630                 item->match = xstrdup(prefix);
 631                 item->original = xstrdup(prefix);
 632                 item->nowildcard_len = item->len = strlen(prefix);
 633                 item->prefix = item->len;
 634                 pathspec->nr = 1;
 635                 return;
 636         }
 637
 638         n = 0;
 639         while (argv[n]) {
 640                 if (*argv[n] == '\0')
 641                         die("empty string is not a valid pathspec. "
 642                                   "please use . instead if you meant to match all paths");
 643                 n++;
 644         }
 645
 646         pathspec->nr = n;
 647         ALLOC_ARRAY(pathspec->items, n + 1);
 648         item = pathspec->items;
 649         prefixlen = prefix ? strlen(prefix) : 0;
 650
 651         for (i = 0; i < n; i++) {
 652                 entry = argv[i];
 653
 654                 init_pathspec_item(item + i, flags, prefix, prefixlen, entry);
 655
 656                 if (item[i].magic & PATHSPEC_EXCLUDE)
 657                         nr_exclude++;
 658                 if (item[i].magic & magic_mask)
 659                         unsupported_magic(entry, item[i].magic & magic_mask);
 660
 661                 if ((flags & PATHSPEC_SYMLINK_LEADING_PATH) &&
 662                     has_symlink_leading_path(item[i].match, item[i].len)) {
 663                         die(_("pathspec '%s' is beyond a symbolic link"), entry);
 664                 }
 665
 666                 if (item[i].nowildcard_len < item[i].len)
 667                         pathspec->has_wildcard = 1;
 668                 pathspec->magic |= item[i].magic;
 669         }
 670
 671         /*
 672          * If everything is an exclude pattern, add one positive pattern
 673          * that matches everything. We allocated an extra one for this.
 674          */
 675         if (nr_exclude == n) {
 676                 int plen = (!(flags & PATHSPEC_PREFER_CWD)) ? 0 : prefixlen;
 677                 init_pathspec_item(item + n, 0, prefix, plen, ".");
 678                 pathspec->nr++;
 679         }
 680
 681         if (pathspec->magic & PATHSPEC_MAXDEPTH) {
 682                 if (flags & PATHSPEC_KEEP_ORDER)
 683                         BUG("PATHSPEC_MAXDEPTH_VALID and PATHSPEC_KEEP_ORDER are incompatible");
 684                 QSORT(pathspec->items, pathspec->nr, pathspec_item_cmp);
 685         }
 686 }
 687
 688 void parse_pathspec_file(struct pathspec *pathspec, unsigned magic_mask,
 689                          unsigned flags, const char *prefix,
 690                          const char *file, int nul_term_line)
 691 {
 692         struct strvec parsed_file = STRVEC_INIT;
 693         strbuf_getline_fn getline_fn = nul_term_line ? strbuf_getline_nul :
 694                                                        strbuf_getline;
 695         struct strbuf buf = STRBUF_INIT;
 696         struct strbuf unquoted = STRBUF_INIT;
 697         FILE *in;
 698
 699         if (!strcmp(file, "-"))
 700                 in = stdin;
 701         else
 702                 in = xfopen(file, "r");
 703
 704         while (getline_fn(&buf, in) != EOF) {
 705                 if (!nul_term_line && buf.buf[0] == '"') {
 706                         strbuf_reset(&unquoted);
 707                         if (unquote_c_style(&unquoted, buf.buf, NULL))
 708                                 die(_("line is badly quoted: %s"), buf.buf);
 709                         strbuf_swap(&buf, &unquoted);
 710                 }
 711                 strvec_push(&parsed_file, buf.buf);
 712                 strbuf_reset(&buf);
 713         }
 714
 715         strbuf_release(&unquoted);
 716         strbuf_release(&buf);
 717         if (in != stdin)
 718                 fclose(in);
 719
 720         parse_pathspec(pathspec, magic_mask, flags, prefix, parsed_file.v);
 721         strvec_clear(&parsed_file);
 722 }
 723
 724 void copy_pathspec(struct pathspec *dst, const struct pathspec *src)
 725 {
 726         int i, j;
 727
 728         *dst = *src;
 729         DUP_ARRAY(dst->items, src->items, dst->nr);
 730
 731         for (i = 0; i < dst->nr; i++) {
 732                 struct pathspec_item *d = &dst->items[i];
 733                 struct pathspec_item *s = &src->items[i];
 734
 735                 d->match = xstrdup(s->match);
 736                 d->original = xstrdup(s->original);
 737
 738                 DUP_ARRAY(d->attr_match, s->attr_match, d->attr_match_nr);
 739                 for (j = 0; j < d->attr_match_nr; j++) {
 740                         const char *value = s->attr_match[j].value;
 741                         d->attr_match[j].value = xstrdup_or_null(value);
 742                 }
 743
 744                 d->attr_check = attr_check_dup(s->attr_check);
 745         }
 746 }
 747
 748 void clear_pathspec(struct pathspec *pathspec)
 749 {
 750         int i, j;
 751
 752         for (i = 0; i < pathspec->nr; i++) {
 753                 free(pathspec->items[i].match);
 754                 free(pathspec->items[i].original);
 755
 756                 for (j = 0; j < pathspec->items[i].attr_match_nr; j++)
 757                         free(pathspec->items[i].attr_match[j].value);
 758                 free(pathspec->items[i].attr_match);
 759
 760                 if (pathspec->items[i].attr_check)
 761                         attr_check_free(pathspec->items[i].attr_check);
 762         }
 763
 764         FREE_AND_NULL(pathspec->items);
 765         pathspec->nr = 0;
 766 }
 767
 768 int match_pathspec_attrs(struct index_state *istate,
 769                          const char *name, int namelen,
 770                          const struct pathspec_item *item)
 771 {
 772         int i;
 773         char *to_free = NULL;
 774
 775         if (name[namelen])
 776                 name = to_free = xmemdupz(name, namelen);
 777
 778         git_check_attr(istate, name, item->attr_check);
 779
 780         free(to_free);
 781
 782         for (i = 0; i < item->attr_match_nr; i++) {
 783                 const char *value;
 784                 int matched;
 785                 enum attr_match_mode match_mode;
 786
 787                 value = item->attr_check->items[i].value;
 788                 match_mode = item->attr_match[i].match_mode;
 789
 790                 if (ATTR_TRUE(value))
 791                         matched = (match_mode == MATCH_SET);
 792                 else if (ATTR_FALSE(value))
 793                         matched = (match_mode == MATCH_UNSET);
 794                 else if (ATTR_UNSET(value))
 795                         matched = (match_mode == MATCH_UNSPECIFIED);
 796                 else
 797                         matched = (match_mode == MATCH_VALUE &&
 798                                    !strcmp(item->attr_match[i].value, value));
 799                 if (!matched)
 800                         return 0;
 801         }
 802
 803         return 1;
 804 }
 805
 806 int pathspec_needs_expanded_index(struct index_state *istate,
 807                                   const struct pathspec *pathspec)
 808 {
 809         unsigned int pos;
 810         int i, res = 0;
 811         char *skip_worktree_seen = NULL;
 812
 813         /*
 814          * If index is not sparse, no index expansion is needed.
 815          */
 816         if (!istate->sparse_index)
 817                 return 0;
 818
 819         /*
 820          * When using a magic pathspec, assume for the sake of simplicity that
 821          * the index needs to be expanded to match all matchable files.
 822          */
 823         if (pathspec->magic)
 824                 return 1;
 825
 826         for (i = 0; i < pathspec->nr; i++) {
 827                 struct pathspec_item item = pathspec->items[i];
 828
 829                 /*
 830                  * If the pathspec item has a wildcard, the index should be expanded
 831                  * if the pathspec has the possibility of matching a subset of entries inside
 832                  * of a sparse directory (but not the entire directory).
 833                  *
 834                  * If the pathspec item is a literal path, the index only needs to be expanded
 835                  * if a) the pathspec isn't in the sparse checkout cone (to make sure we don't
 836                  * expand for in-cone files) and b) it doesn't match any sparse directories
 837                  * (since we can reset whole sparse directories without expanding them).
 838                  */
 839                 if (item.nowildcard_len < item.len) {
 840                         /*
 841                          * Special case: if the pattern is a path inside the cone
 842                          * followed by only wildcards, the pattern cannot match
 843                          * partial sparse directories, so we know we don't need to
 844                          * expand the index.
 845                          *
 846                          * Examples:
 847                          * - in-cone/foo***: doesn't need expanded index
 848                          * - not-in-cone/bar*: may need expanded index
 849                          * - **.c: may need expanded index
 850                          */
 851                         if (strspn(item.original + item.nowildcard_len, "*") ==
 852                                     (unsigned int)(item.len - item.nowildcard_len) &&
 853                             path_in_cone_mode_sparse_checkout(item.original, istate))
 854                                 continue;
 855
 856                         for (pos = 0; pos < istate->cache_nr; pos++) {
 857                                 struct cache_entry *ce = istate->cache[pos];
 858
 859                                 if (!S_ISSPARSEDIR(ce->ce_mode))
 860                                         continue;
 861
 862                                 /*
 863                                  * If the pre-wildcard length is longer than the sparse
 864                                  * directory name and the sparse directory is the first
 865                                  * component of the pathspec, need to expand the index.
 866                                  */
 867                                 if ((unsigned int)item.nowildcard_len >
 868                                             ce_namelen(ce) &&
 869                                     !strncmp(item.original, ce->name,
 870                                              ce_namelen(ce))) {
 871                                         res = 1;
 872                                         break;
 873                                 }
 874
 875                                 /*
 876                                  * If the pre-wildcard length is shorter than the sparse
 877                                  * directory and the pathspec does not match the whole
 878                                  * directory, need to expand the index.
 879                                  */
 880                                 if (!strncmp(item.original, ce->name, item.nowildcard_len) &&
 881                                     wildmatch(item.original, ce->name, 0)) {
 882                                         res = 1;
 883                                         break;
 884                                 }
 885                         }
 886                 } else if (!path_in_cone_mode_sparse_checkout(item.original, istate) &&
 887                            !matches_skip_worktree(pathspec, i, &skip_worktree_seen))
 888                         res = 1;
 889
 890                 if (res > 0)
 891                         break;
 892         }
 893
 894         free(skip_worktree_seen);
 895         return res;
 896 }