pathspec.c

   1 #include "cache.h"
   2 #include "dir.h"
   3 #include "pathspec.h"
   4
   5 /*
   6  * Finds which of the given pathspecs match items in the index.
   7  *
   8  * For each pathspec, sets the corresponding entry in the seen[] array
   9  * (which should be specs items long, i.e. the same size as pathspec)
  10  * to the nature of the "closest" (i.e. most specific) match found for
  11  * that pathspec in the index, if it was a closer type of match than
  12  * the existing entry.  As an optimization, matching is skipped
  13  * altogether if seen[] already only contains non-zero entries.
  14  *
  15  * If seen[] has not already been written to, it may make sense
  16  * to use find_pathspecs_matching_against_index() instead.
  17  */
  18 void add_pathspec_matches_against_index(const struct pathspec *pathspec,
  19                                         char *seen)
  20 {
  21         int num_unmatched = 0, i;
  22
  23         /*
  24          * Since we are walking the index as if we were walking the directory,
  25          * we have to mark the matched pathspec as seen; otherwise we will
  26          * mistakenly think that the user gave a pathspec that did not match
  27          * anything.
  28          */
  29         for (i = 0; i < pathspec->nr; i++)
  30                 if (!seen[i])
  31                         num_unmatched++;
  32         if (!num_unmatched)
  33                 return;
  34         for (i = 0; i < active_nr; i++) {
  35                 const struct cache_entry *ce = active_cache[i];
  36                 ce_path_match(ce, pathspec, seen);
  37         }
  38 }
  39
  40 /*
  41  * Finds which of the given pathspecs match items in the index.
  42  *
  43  * This is a one-shot wrapper around add_pathspec_matches_against_index()
  44  * which allocates, populates, and returns a seen[] array indicating the
  45  * nature of the "closest" (i.e. most specific) matches which each of the
  46  * given pathspecs achieves against all items in the index.
  47  */
  48 char *find_pathspecs_matching_against_index(const struct pathspec *pathspec)
  49 {
  50         char *seen = xcalloc(pathspec->nr, 1);
  51         add_pathspec_matches_against_index(pathspec, seen);
  52         return seen;
  53 }
  54
  55 /*
  56  * Magic pathspec
  57  *
  58  * Possible future magic semantics include stuff like:
  59  *
  60  *      { PATHSPEC_RECURSIVE, '*', "recursive" },
  61  *      { PATHSPEC_REGEXP, '\0', "regexp" },
  62  *
  63  */
  64
  65 static struct pathspec_magic {
  66         unsigned bit;
  67         char mnemonic; /* this cannot be ':'! */
  68         const char *name;
  69 } pathspec_magic[] = {
  70         { PATHSPEC_FROMTOP, '/', "top" },
  71         { PATHSPEC_LITERAL,   0, "literal" },
  72         { PATHSPEC_GLOB,   '\0', "glob" },
  73         { PATHSPEC_ICASE,  '\0', "icase" },
  74         { PATHSPEC_EXCLUDE, '!', "exclude" },
  75 };
  76
  77 static void prefix_magic(struct strbuf *sb, int prefixlen, unsigned magic)
  78 {
  79         int i;
  80         strbuf_addstr(sb, ":(");
  81         for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
  82                 if (magic & pathspec_magic[i].bit) {
  83                         if (sb->buf[sb->len - 1] != '(')
  84                                 strbuf_addch(sb, ',');
  85                         strbuf_addstr(sb, pathspec_magic[i].name);
  86                 }
  87         strbuf_addf(sb, ",prefix:%d)", prefixlen);
  88 }
  89
  90 static inline int get_literal_global(void)
  91 {
  92         static int literal = -1;
  93
  94         if (literal < 0)
  95                 literal = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0);
  96
  97         return literal;
  98 }
  99
 100 static inline int get_glob_global(void)
 101 {
 102         static int glob = -1;
 103
 104         if (glob < 0)
 105                 glob = git_env_bool(GIT_GLOB_PATHSPECS_ENVIRONMENT, 0);
 106
 107         return glob;
 108 }
 109
 110 static inline int get_noglob_global(void)
 111 {
 112         static int noglob = -1;
 113
 114         if (noglob < 0)
 115                 noglob = git_env_bool(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, 0);
 116
 117         return noglob;
 118 }
 119
 120 static inline int get_icase_global(void)
 121 {
 122         static int icase = -1;
 123
 124         if (icase < 0)
 125                 icase = git_env_bool(GIT_ICASE_PATHSPECS_ENVIRONMENT, 0);
 126
 127         return icase;
 128 }
 129
 130 static int get_global_magic(int element_magic)
 131 {
 132         int global_magic = 0;
 133
 134         if (get_literal_global())
 135                 global_magic |= PATHSPEC_LITERAL;
 136
 137         /* --glob-pathspec is overridden by :(literal) */
 138         if (get_glob_global() && !(element_magic & PATHSPEC_LITERAL))
 139                 global_magic |= PATHSPEC_GLOB;
 140
 141         if (get_glob_global() && get_noglob_global())
 142                 die(_("global 'glob' and 'noglob' pathspec settings are incompatible"));
 143
 144         if (get_icase_global())
 145                 global_magic |= PATHSPEC_ICASE;
 146
 147         if ((global_magic & PATHSPEC_LITERAL) &&
 148             (global_magic & ~PATHSPEC_LITERAL))
 149                 die(_("global 'literal' pathspec setting is incompatible "
 150                       "with all other global pathspec settings"));
 151
 152         /* --noglob-pathspec adds :(literal) _unless_ :(glob) is specified */
 153         if (get_noglob_global() && !(element_magic & PATHSPEC_GLOB))
 154                 global_magic |= PATHSPEC_LITERAL;
 155
 156         return global_magic;
 157 }
 158
 159 /*
 160  * Parse the pathspec element looking for long magic
 161  *
 162  * saves all magic in 'magic'
 163  * if prefix magic is used, save the prefix length in 'prefix_len'
 164  * returns the position in 'elem' after all magic has been parsed
 165  */
 166 static const char *parse_long_magic(unsigned *magic, int *prefix_len,
 167                                     const char *elem)
 168 {
 169         const char *pos;
 170         const char *nextat;
 171
 172         for (pos = elem + 2; *pos && *pos != ')'; pos = nextat) {
 173                 size_t len = strcspn(pos, ",)");
 174                 int i;
 175
 176                 if (pos[len] == ',')
 177                         nextat = pos + len + 1; /* handle ',' */
 178                 else
 179                         nextat = pos + len; /* handle ')' and '\0' */
 180
 181                 if (!len)
 182                         continue;
 183
 184                 if (starts_with(pos, "prefix:")) {
 185                         char *endptr;
 186                         *prefix_len = strtol(pos + 7, &endptr, 10);
 187                         if (endptr - pos != len)
 188                                 die(_("invalid parameter for pathspec magic 'prefix'"));
 189                         continue;
 190                 }
 191
 192                 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 193                         if (strlen(pathspec_magic[i].name) == len &&
 194                             !strncmp(pathspec_magic[i].name, pos, len)) {
 195                                 *magic |= pathspec_magic[i].bit;
 196                                 break;
 197                         }
 198                 }
 199
 200                 if (ARRAY_SIZE(pathspec_magic) <= i)
 201                         die(_("Invalid pathspec magic '%.*s' in '%s'"),
 202                             (int) len, pos, elem);
 203         }
 204
 205         if (*pos != ')')
 206                 die(_("Missing ')' at the end of pathspec magic in '%s'"),
 207                     elem);
 208         pos++;
 209
 210         return pos;
 211 }
 212
 213 /*
 214  * Parse the pathspec element looking for short magic
 215  *
 216  * saves all magic in 'magic'
 217  * returns the position in 'elem' after all magic has been parsed
 218  */
 219 static const char *parse_short_magic(unsigned *magic, const char *elem)
 220 {
 221         const char *pos;
 222
 223         for (pos = elem + 1; *pos && *pos != ':'; pos++) {
 224                 char ch = *pos;
 225                 int i;
 226
 227                 if (!is_pathspec_magic(ch))
 228                         break;
 229
 230                 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 231                         if (pathspec_magic[i].mnemonic == ch) {
 232                                 *magic |= pathspec_magic[i].bit;
 233                                 break;
 234                         }
 235                 }
 236
 237                 if (ARRAY_SIZE(pathspec_magic) <= i)
 238                         die(_("Unimplemented pathspec magic '%c' in '%s'"),
 239                             ch, elem);
 240         }
 241
 242         if (*pos == ':')
 243                 pos++;
 244
 245         return pos;
 246 }
 247
 248 /*
 249  * Take an element of a pathspec and check for magic signatures.
 250  * Append the result to the prefix. Return the magic bitmap.
 251  *
 252  * For now, we only parse the syntax and throw out anything other than
 253  * "top" magic.
 254  *
 255  * NEEDSWORK: This needs to be rewritten when we start migrating
 256  * get_pathspec() users to use the "struct pathspec" interface.  For
 257  * example, a pathspec element may be marked as case-insensitive, but
 258  * the prefix part must always match literally, and a single stupid
 259  * string cannot express such a case.
 260  */
 261 static unsigned prefix_pathspec(struct pathspec_item *item, unsigned flags,
 262                                 const char *prefix, int prefixlen,
 263                                 const char *elt)
 264 {
 265         unsigned magic = 0, element_magic = 0;
 266         const char *copyfrom = elt;
 267         char *match;
 268         int i, pathspec_prefix = -1;
 269
 270         if (elt[0] != ':' || get_literal_global() ||
 271             (flags & PATHSPEC_LITERAL_PATH)) {
 272                 ; /* nothing to do */
 273         } else if (elt[1] == '(') {
 274                 /* longhand */
 275                 copyfrom = parse_long_magic(&element_magic,
 276                                             &pathspec_prefix,
 277                                             elt);
 278         } else {
 279                 /* shorthand */
 280                 copyfrom = parse_short_magic(&element_magic, elt);
 281         }
 282
 283         magic |= element_magic;
 284
 285         /* PATHSPEC_LITERAL_PATH ignores magic */
 286         if (flags & PATHSPEC_LITERAL_PATH)
 287                 magic = PATHSPEC_LITERAL;
 288         else
 289                 magic |= get_global_magic(element_magic);
 290
 291         if (pathspec_prefix >= 0 &&
 292             (prefixlen || (prefix && *prefix)))
 293                 die("BUG: 'prefix' magic is supposed to be used at worktree's root");
 294
 295         if ((magic & PATHSPEC_LITERAL) && (magic & PATHSPEC_GLOB))
 296                 die(_("%s: 'literal' and 'glob' are incompatible"), elt);
 297
 298         if (pathspec_prefix >= 0) {
 299                 match = xstrdup(copyfrom);
 300                 prefixlen = pathspec_prefix;
 301         } else if (magic & PATHSPEC_FROMTOP) {
 302                 match = xstrdup(copyfrom);
 303                 prefixlen = 0;
 304         } else {
 305                 match = prefix_path_gently(prefix, prefixlen, &prefixlen, copyfrom);
 306                 if (!match)
 307                         die(_("%s: '%s' is outside repository"), elt, copyfrom);
 308         }
 309         item->match = match;
 310         /*
 311          * Prefix the pathspec (keep all magic) and assign to
 312          * original. Useful for passing to another command.
 313          */
 314         if ((flags & PATHSPEC_PREFIX_ORIGIN) &&
 315             prefixlen && !get_literal_global()) {
 316                 struct strbuf sb = STRBUF_INIT;
 317
 318                 /* Preserve the actual prefix length of each pattern */
 319                 prefix_magic(&sb, prefixlen, element_magic);
 320
 321                 strbuf_addstr(&sb, match);
 322                 item->original = strbuf_detach(&sb, NULL);
 323         } else {
 324                 item->original = xstrdup(elt);
 325         }
 326         item->len = strlen(item->match);
 327         item->prefix = prefixlen;
 328
 329         if ((flags & PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP) &&
 330             (item->len >= 1 && item->match[item->len - 1] == '/') &&
 331             (i = cache_name_pos(item->match, item->len - 1)) >= 0 &&
 332             S_ISGITLINK(active_cache[i]->ce_mode)) {
 333                 item->len--;
 334                 match[item->len] = '\0';
 335         }
 336
 337         if (flags & PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE)
 338                 for (i = 0; i < active_nr; i++) {
 339                         struct cache_entry *ce = active_cache[i];
 340                         int ce_len = ce_namelen(ce);
 341
 342                         if (!S_ISGITLINK(ce->ce_mode))
 343                                 continue;
 344
 345                         if (item->len <= ce_len || match[ce_len] != '/' ||
 346                             memcmp(ce->name, match, ce_len))
 347                                 continue;
 348                         if (item->len == ce_len + 1) {
 349                                 /* strip trailing slash */
 350                                 item->len--;
 351                                 match[item->len] = '\0';
 352                         } else
 353                                 die (_("Pathspec '%s' is in submodule '%.*s'"),
 354                                      elt, ce_len, ce->name);
 355                 }
 356
 357         if (magic & PATHSPEC_LITERAL)
 358                 item->nowildcard_len = item->len;
 359         else {
 360                 item->nowildcard_len = simple_length(item->match);
 361                 if (item->nowildcard_len < prefixlen)
 362                         item->nowildcard_len = prefixlen;
 363         }
 364         item->flags = 0;
 365         if (magic & PATHSPEC_GLOB) {
 366                 /*
 367                  * FIXME: should we enable ONESTAR in _GLOB for
 368                  * pattern "* * / * . c"?
 369                  */
 370         } else {
 371                 if (item->nowildcard_len < item->len &&
 372                     item->match[item->nowildcard_len] == '*' &&
 373                     no_wildcard(item->match + item->nowildcard_len + 1))
 374                         item->flags |= PATHSPEC_ONESTAR;
 375         }
 376
 377         /* sanity checks, pathspec matchers assume these are sane */
 378         assert(item->nowildcard_len <= item->len &&
 379                item->prefix         <= item->len);
 380         return magic;
 381 }
 382
 383 static int pathspec_item_cmp(const void *a_, const void *b_)
 384 {
 385         struct pathspec_item *a, *b;
 386
 387         a = (struct pathspec_item *)a_;
 388         b = (struct pathspec_item *)b_;
 389         return strcmp(a->match, b->match);
 390 }
 391
 392 static void NORETURN unsupported_magic(const char *pattern,
 393                                        unsigned magic)
 394 {
 395         struct strbuf sb = STRBUF_INIT;
 396         int i;
 397         for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
 398                 const struct pathspec_magic *m = pathspec_magic + i;
 399                 if (!(magic & m->bit))
 400                         continue;
 401                 if (sb.len)
 402                         strbuf_addstr(&sb, ", ");
 403
 404                 if (m->mnemonic)
 405                         strbuf_addf(&sb, _("'%s' (mnemonic: '%c')"),
 406                                     m->name, m->mnemonic);
 407                 else
 408                         strbuf_addf(&sb, "'%s'", m->name);
 409         }
 410         /*
 411          * We may want to substitute "this command" with a command
 412          * name. E.g. when add--interactive dies when running
 413          * "checkout -p"
 414          */
 415         die(_("%s: pathspec magic not supported by this command: %s"),
 416             pattern, sb.buf);
 417 }
 418
 419 /*
 420  * Given command line arguments and a prefix, convert the input to
 421  * pathspec. die() if any magic in magic_mask is used.
 422  */
 423 void parse_pathspec(struct pathspec *pathspec,
 424                     unsigned magic_mask, unsigned flags,
 425                     const char *prefix, const char **argv)
 426 {
 427         struct pathspec_item *item;
 428         const char *entry = argv ? *argv : NULL;
 429         int i, n, prefixlen, warn_empty_string, nr_exclude = 0;
 430
 431         memset(pathspec, 0, sizeof(*pathspec));
 432
 433         if (flags & PATHSPEC_MAXDEPTH_VALID)
 434                 pathspec->magic |= PATHSPEC_MAXDEPTH;
 435
 436         /* No arguments, no prefix -> no pathspec */
 437         if (!entry && !prefix)
 438                 return;
 439
 440         if ((flags & PATHSPEC_PREFER_CWD) &&
 441             (flags & PATHSPEC_PREFER_FULL))
 442                 die("BUG: PATHSPEC_PREFER_CWD and PATHSPEC_PREFER_FULL are incompatible");
 443
 444         /* No arguments with prefix -> prefix pathspec */
 445         if (!entry) {
 446                 if (flags & PATHSPEC_PREFER_FULL)
 447                         return;
 448
 449                 if (!(flags & PATHSPEC_PREFER_CWD))
 450                         die("BUG: PATHSPEC_PREFER_CWD requires arguments");
 451
 452                 pathspec->items = item = xcalloc(1, sizeof(*item));
 453                 item->match = xstrdup(prefix);
 454                 item->original = xstrdup(prefix);
 455                 item->nowildcard_len = item->len = strlen(prefix);
 456                 item->prefix = item->len;
 457                 pathspec->nr = 1;
 458                 return;
 459         }
 460
 461         n = 0;
 462         warn_empty_string = 1;
 463         while (argv[n]) {
 464                 if (*argv[n] == '\0' && warn_empty_string) {
 465                         warning(_("empty strings as pathspecs will be made invalid in upcoming releases. "
 466                                   "please use . instead if you meant to match all paths"));
 467                         warn_empty_string = 0;
 468                 }
 469                 n++;
 470         }
 471
 472         pathspec->nr = n;
 473         ALLOC_ARRAY(pathspec->items, n);
 474         item = pathspec->items;
 475         prefixlen = prefix ? strlen(prefix) : 0;
 476
 477         for (i = 0; i < n; i++) {
 478                 entry = argv[i];
 479
 480                 item[i].magic = prefix_pathspec(item + i, flags,
 481                                                 prefix, prefixlen, entry);
 482
 483                 if (item[i].magic & PATHSPEC_EXCLUDE)
 484                         nr_exclude++;
 485                 if (item[i].magic & magic_mask)
 486                         unsupported_magic(entry, item[i].magic & magic_mask);
 487
 488                 if ((flags & PATHSPEC_SYMLINK_LEADING_PATH) &&
 489                     has_symlink_leading_path(item[i].match, item[i].len)) {
 490                         die(_("pathspec '%s' is beyond a symbolic link"), entry);
 491                 }
 492
 493                 if (item[i].nowildcard_len < item[i].len)
 494                         pathspec->has_wildcard = 1;
 495                 pathspec->magic |= item[i].magic;
 496         }
 497
 498         if (nr_exclude == n)
 499                 die(_("There is nothing to exclude from by :(exclude) patterns.\n"
 500                       "Perhaps you forgot to add either ':/' or '.' ?"));
 501
 502
 503         if (pathspec->magic & PATHSPEC_MAXDEPTH) {
 504                 if (flags & PATHSPEC_KEEP_ORDER)
 505                         die("BUG: PATHSPEC_MAXDEPTH_VALID and PATHSPEC_KEEP_ORDER are incompatible");
 506                 QSORT(pathspec->items, pathspec->nr, pathspec_item_cmp);
 507         }
 508 }
 509
 510 void copy_pathspec(struct pathspec *dst, const struct pathspec *src)
 511 {
 512         int i;
 513
 514         *dst = *src;
 515         ALLOC_ARRAY(dst->items, dst->nr);
 516         COPY_ARRAY(dst->items, src->items, dst->nr);
 517
 518         for (i = 0; i < dst->nr; i++) {
 519                 dst->items[i].match = xstrdup(src->items[i].match);
 520                 dst->items[i].original = xstrdup(src->items[i].original);
 521         }
 522 }
 523
 524 void clear_pathspec(struct pathspec *pathspec)
 525 {
 526         int i;
 527
 528         for (i = 0; i < pathspec->nr; i++) {
 529                 free(pathspec->items[i].match);
 530                 free(pathspec->items[i].original);
 531         }
 532         free(pathspec->items);
 533         pathspec->items = NULL;
 534         pathspec->nr = 0;
 535 }