libopkg/pkg_depends.c

   1 /* pkg_depends.c - the opkg package management system
   2
   3    Steven M. Ayer
   4
   5    Copyright (C) 2002 Compaq Computer Corporation
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16 */
  17
  18 #include <stdio.h>
  19 #include <ctype.h>
  20
  21 #include "pkg.h"
  22 #include "opkg_utils.h"
  23 #include "pkg_hash.h"
  24 #include "opkg_message.h"
  25 #include "pkg_parse.h"
  26 #include "hash_table.h"
  27 #include "libbb/libbb.h"
  28
  29 static int parseDepends(compound_depend_t * compound_depend, char *depend_str);
  30 static depend_t *depend_init(void);
  31 static char **add_unresolved_dep(pkg_t * pkg, char **the_lost, int ref_ndx);
  32 static char **merge_unresolved(char **oldstuff, char **newstuff);
  33 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg);
  34
  35 static int pkg_installed_and_constraint_satisfied(pkg_t * pkg, void *cdata)
  36 {
  37         depend_t *depend = (depend_t *) cdata;
  38         if ((pkg->state_status == SS_INSTALLED
  39              || pkg->state_status == SS_UNPACKED)
  40             && version_constraints_satisfied(depend, pkg))
  41                 return 1;
  42         else
  43                 return 0;
  44 }
  45
  46 static int pkg_constraint_satisfied(pkg_t * pkg, void *cdata)
  47 {
  48         depend_t *depend = (depend_t *) cdata;
  49         if (version_constraints_satisfied(depend, pkg))
  50                 return 1;
  51         else
  52                 return 0;
  53 }
  54
  55 /* returns ndependencies or negative error value */
  56 int
  57 pkg_hash_fetch_unsatisfied_dependencies(pkg_t * pkg, pkg_vec_t * unsatisfied,
  58                                         char ***unresolved)
  59 {
  60         pkg_t *satisfier_entry_pkg;
  61         int i, j, k;
  62         int found;
  63         char **the_lost;
  64         abstract_pkg_t *ab_pkg;
  65         compound_depend_t *compound_depend;
  66
  67         /*
  68          * this is a setup to check for redundant/cyclic dependency checks,
  69          * which are marked at the abstract_pkg level
  70          */
  71         if (!(ab_pkg = pkg->parent)) {
  72                 opkg_msg(ERROR, "Internal error, with pkg %s.\n", pkg->name);
  73                 *unresolved = NULL;
  74                 return 0;
  75         }
  76         if (ab_pkg->dependencies_checked) {     /* avoid duplicate or cyclic checks */
  77                 *unresolved = NULL;
  78                 return 0;
  79         } else {
  80                 ab_pkg->dependencies_checked = 1;       /* mark it for subsequent visits */
  81         }
  82
  83         compound_depend = pkg_get_ptr(pkg, PKG_DEPENDS);
  84
  85         if (!compound_depend || !compound_depend->type) {
  86                 *unresolved = NULL;
  87                 return 0;
  88         }
  89
  90         the_lost = NULL;
  91
  92         /* foreach dependency */
  93         for (i = 0; compound_depend && compound_depend->type; compound_depend++, i++) {
  94                 depend_t **possible_satisfiers =
  95                     compound_depend->possibilities;;
  96                 found = 0;
  97                 satisfier_entry_pkg = NULL;
  98
  99                 if (compound_depend->type == GREEDY_DEPEND) {
 100                         /* foreach possible satisfier */
 101                         for (j = 0; j < compound_depend->possibility_count; j++) {
 102                                 /* foreach provided_by, which includes the abstract_pkg itself */
 103                                 abstract_pkg_t *abpkg =
 104                                     possible_satisfiers[j]->pkg;
 105                                 abstract_pkg_vec_t *ab_provider_vec =
 106                                     abpkg->provided_by;
 107                                 int nposs = ab_provider_vec->len;
 108                                 abstract_pkg_t **ab_providers =
 109                                     ab_provider_vec->pkgs;
 110                                 int l;
 111                                 for (l = 0; l < nposs; l++) {
 112                                         pkg_vec_t *test_vec =
 113                                             ab_providers[l]->pkgs;
 114                                         /* if no depends on this one, try the first package that Provides this one */
 115                                         if (!test_vec) {        /* no pkg_vec hooked up to the abstract_pkg!  (need another feed?) */
 116                                                 continue;
 117                                         }
 118
 119                                         /* cruise this possiblity's pkg_vec looking for an installed version */
 120                                         for (k = 0; k < test_vec->len; k++) {
 121                                                 pkg_t *pkg_scout =
 122                                                     test_vec->pkgs[k];
 123                                                 /* not installed, and not already known about? */
 124                                                 if ((pkg_scout->state_want !=
 125                                                      SW_INSTALL)
 126                                                     && !pkg_scout->parent->
 127                                                     dependencies_checked
 128                                                     &&
 129                                                     !is_pkg_in_pkg_vec
 130                                                     (unsatisfied, pkg_scout)) {
 131                                                         char **newstuff = NULL;
 132                                                         int rc;
 133                                                         pkg_vec_t *tmp_vec =
 134                                                             pkg_vec_alloc();
 135                                                         /* check for not-already-installed dependencies */
 136                                                         rc = pkg_hash_fetch_unsatisfied_dependencies(pkg_scout, tmp_vec, &newstuff);
 137                                                         if (newstuff == NULL) {
 138                                                                 int m;
 139                                                                 int ok = 1;
 140                                                                 for (m = 0;
 141                                                                      m < rc;
 142                                                                      m++) {
 143                                                                         pkg_t *p
 144                                                                             =
 145                                                                             tmp_vec->
 146                                                                             pkgs
 147                                                                             [m];
 148                                                                         if (p->
 149                                                                             state_want
 150                                                                             ==
 151                                                                             SW_INSTALL)
 152                                                                                 continue;
 153                                                                         opkg_msg
 154                                                                             (DEBUG,
 155                                                                              "Not installing %s due"
 156                                                                              " to requirement for %s.\n",
 157                                                                              pkg_scout->
 158                                                                              name,
 159                                                                              p->
 160                                                                              name);
 161                                                                         ok = 0;
 162                                                                         break;
 163                                                                 }
 164                                                                 pkg_vec_free
 165                                                                     (tmp_vec);
 166                                                                 if (ok) {
 167                                                                         /* mark this one for installation */
 168                                                                         opkg_msg
 169                                                                             (NOTICE,
 170                                                                              "Adding satisfier for greedy"
 171                                                                              " dependence %s.\n",
 172                                                                              pkg_scout->
 173                                                                              name);
 174                                                                         pkg_vec_insert
 175                                                                             (unsatisfied,
 176                                                                              pkg_scout);
 177                                                                 }
 178                                                         } else {
 179                                                                 opkg_msg(DEBUG,
 180                                                                          "Not installing %s due to "
 181                                                                          "broken depends.\n",
 182                                                                          pkg_scout->
 183                                                                          name);
 184                                                                 free(newstuff);
 185                                                         }
 186                                                 }
 187                                         }
 188                                 }
 189                         }
 190
 191                         continue;
 192                 }
 193
 194                 /* foreach possible satisfier, look for installed package  */
 195                 for (j = 0; j < compound_depend->possibility_count; j++) {
 196                         /* foreach provided_by, which includes the abstract_pkg itself */
 197                         depend_t *dependence_to_satisfy =
 198                             possible_satisfiers[j];
 199                         abstract_pkg_t *satisfying_apkg =
 200                             possible_satisfiers[j]->pkg;
 201                         pkg_t *satisfying_pkg =
 202                             pkg_hash_fetch_best_installation_candidate
 203                             (satisfying_apkg,
 204                              pkg_installed_and_constraint_satisfied,
 205                              dependence_to_satisfy, 1);
 206                         /* Being that I can't test constraing in pkg_hash, I will test it here */
 207                         if (satisfying_pkg != NULL) {
 208                                 if (!pkg_installed_and_constraint_satisfied
 209                                     (satisfying_pkg, dependence_to_satisfy)) {
 210                                         satisfying_pkg = NULL;
 211                                 }
 212                         }
 213                         opkg_msg(DEBUG, "satisfying_pkg=%p\n", satisfying_pkg);
 214                         if (satisfying_pkg != NULL) {
 215                                 found = 1;
 216                                 break;
 217                         }
 218
 219                 }
 220                 /* if nothing installed matches, then look for uninstalled satisfier */
 221                 if (!found) {
 222                         /* foreach possible satisfier, look for installed package  */
 223                         for (j = 0; j < compound_depend->possibility_count; j++) {
 224                                 /* foreach provided_by, which includes the abstract_pkg itself */
 225                                 depend_t *dependence_to_satisfy =
 226                                     possible_satisfiers[j];
 227                                 abstract_pkg_t *satisfying_apkg =
 228                                     possible_satisfiers[j]->pkg;
 229                                 pkg_t *satisfying_pkg =
 230                                     pkg_hash_fetch_best_installation_candidate
 231                                     (satisfying_apkg,
 232                                      pkg_constraint_satisfied,
 233                                      dependence_to_satisfy, 1);
 234                                 /* Being that I can't test constraing in pkg_hash, I will test it here too */
 235                                 if (satisfying_pkg != NULL) {
 236                                         if (!pkg_constraint_satisfied
 237                                             (satisfying_pkg,
 238                                              dependence_to_satisfy)) {
 239                                                 satisfying_pkg = NULL;
 240                                         }
 241                                 }
 242
 243                                 /* user request overrides package recommendation */
 244                                 if (satisfying_pkg != NULL
 245                                     && (compound_depend->type == RECOMMEND
 246                                         || compound_depend->type == SUGGEST)
 247                                     && (satisfying_pkg->state_want ==
 248                                         SW_DEINSTALL
 249                                         || satisfying_pkg->state_want ==
 250                                         SW_PURGE)) {
 251                                         opkg_msg(NOTICE,
 252                                                  "%s: ignoring recommendation for "
 253                                                  "%s at user request\n",
 254                                                  pkg->name,
 255                                                  satisfying_pkg->name);
 256                                         continue;
 257                                 }
 258
 259                                 opkg_msg(DEBUG, "satisfying_pkg=%p\n",
 260                                          satisfying_pkg);
 261                                 if (satisfying_pkg != NULL) {
 262                                         satisfier_entry_pkg = satisfying_pkg;
 263                                         break;
 264                                 }
 265                         }
 266                 }
 267
 268                 /* we didn't find one, add something to the unsatisfied vector */
 269                 if (!found) {
 270                         if (!satisfier_entry_pkg) {
 271                                 /* failure to meet recommendations is not an error */
 272                                 if (compound_depend->type != RECOMMEND
 273                                     && compound_depend->type != SUGGEST)
 274                                         the_lost =
 275                                             add_unresolved_dep(pkg, the_lost,
 276                                                                i);
 277                                 else
 278                                         opkg_msg(NOTICE,
 279                                                  "%s: unsatisfied recommendation for %s\n",
 280                                                  pkg->name,
 281                                                  compound_depend->
 282                                                  possibilities[0]->pkg->name);
 283                         } else {
 284                                 if (compound_depend->type == SUGGEST) {
 285                                         /* just mention it politely */
 286                                         opkg_msg(NOTICE,
 287                                                  "package %s suggests installing %s\n",
 288                                                  pkg->name,
 289                                                  satisfier_entry_pkg->name);
 290                                 } else {
 291                                         char **newstuff = NULL;
 292
 293                                         if (satisfier_entry_pkg != pkg &&
 294                                             !is_pkg_in_pkg_vec(unsatisfied,
 295                                                                satisfier_entry_pkg))
 296                                         {
 297                                                 pkg_vec_insert(unsatisfied,
 298                                                                satisfier_entry_pkg);
 299                                                 pkg_hash_fetch_unsatisfied_dependencies
 300                                                     (satisfier_entry_pkg,
 301                                                      unsatisfied, &newstuff);
 302                                                 the_lost =
 303                                                     merge_unresolved(the_lost,
 304                                                                      newstuff);
 305                                                 if (newstuff)
 306                                                         free(newstuff);
 307                                         }
 308                                 }
 309                         }
 310                 }
 311         }
 312         *unresolved = the_lost;
 313
 314         return unsatisfied->len;
 315 }
 316
 317 /*checking for conflicts !in replaces
 318   If a packages conflicts with another but is also replacing it, I should not consider it a
 319   really conflicts
 320   returns 0 if conflicts <> replaces or 1 if conflicts == replaces
 321 */
 322 static int is_pkg_a_replaces(pkg_t * pkg_scout, pkg_t * pkg)
 323 {
 324         abstract_pkg_t **replaces = pkg_get_ptr(pkg, PKG_REPLACES);
 325
 326         if (!replaces || !*replaces)
 327                 return 0;
 328
 329         while (*replaces) {
 330                 if (strcmp(pkg_scout->name, (*replaces)->name) == 0) {  // Found
 331                         opkg_msg(DEBUG2, "Seems I've found a replace %s %s\n",
 332                                  pkg_scout->name, (*replaces)->name);
 333                         return 1;
 334                 }
 335                 replaces++;
 336         }
 337
 338         return 0;
 339 }
 340
 341 pkg_vec_t *pkg_hash_fetch_conflicts(pkg_t * pkg)
 342 {
 343         pkg_vec_t *installed_conflicts, *test_vec;
 344         compound_depend_t *conflicts, *conflict;
 345         depend_t **possible_satisfiers;
 346         depend_t *possible_satisfier;
 347         int j, k;
 348         abstract_pkg_t *ab_pkg;
 349         pkg_t **pkg_scouts;
 350         pkg_t *pkg_scout;
 351
 352         /*
 353          * this is a setup to check for redundant/cyclic dependency checks,
 354          * which are marked at the abstract_pkg level
 355          */
 356         if (!(ab_pkg = pkg->parent)) {
 357                 opkg_msg(ERROR, "Internal error: %s not in hash table\n",
 358                          pkg->name);
 359                 return (pkg_vec_t *) NULL;
 360         }
 361
 362         conflicts = pkg_get_ptr(pkg, PKG_CONFLICTS);
 363         if (!conflicts) {
 364                 return (pkg_vec_t *) NULL;
 365         }
 366         installed_conflicts = pkg_vec_alloc();
 367
 368         /* foreach conflict */
 369         for (conflict = conflicts; conflict->type; conflict++ ) {
 370                 possible_satisfiers = conflicts->possibilities;
 371
 372                 /* foreach possible satisfier */
 373                 for (j = 0; j < conflicts->possibility_count; j++) {
 374                         possible_satisfier = possible_satisfiers[j];
 375                         if (!possible_satisfier)
 376                                 opkg_msg(ERROR,
 377                                          "Internal error: possible_satisfier=NULL\n");
 378                         if (!possible_satisfier->pkg)
 379                                 opkg_msg(ERROR,
 380                                          "Internal error: possible_satisfier->pkg=NULL\n");
 381                         test_vec = possible_satisfier->pkg->pkgs;
 382                         if (test_vec) {
 383                                 /* pkg_vec found, it is an actual package conflict
 384                                  * cruise this possiblity's pkg_vec looking for an installed version */
 385                                 pkg_scouts = test_vec->pkgs;
 386                                 for (k = 0; k < test_vec->len; k++) {
 387                                         pkg_scout = pkg_scouts[k];
 388                                         if (!pkg_scout) {
 389                                                 opkg_msg(ERROR,
 390                                                          "Internal error: pkg_scout=NULL\n");
 391                                                 continue;
 392                                         }
 393                                         if ((pkg_scout->state_status ==
 394                                              SS_INSTALLED
 395                                              || pkg_scout->state_want ==
 396                                              SW_INSTALL)
 397                                             &&
 398                                             version_constraints_satisfied
 399                                             (possible_satisfier, pkg_scout)
 400                                             && !is_pkg_a_replaces(pkg_scout,
 401                                                                   pkg)) {
 402                                                 if (!is_pkg_in_pkg_vec
 403                                                     (installed_conflicts,
 404                                                      pkg_scout)) {
 405                                                         pkg_vec_insert
 406                                                             (installed_conflicts,
 407                                                              pkg_scout);
 408                                                 }
 409                                         }
 410                                 }
 411                         }
 412                 }
 413                 conflicts++;
 414         }
 415
 416         if (installed_conflicts->len)
 417                 return installed_conflicts;
 418         pkg_vec_free(installed_conflicts);
 419         return (pkg_vec_t *) NULL;
 420 }
 421
 422 int version_constraints_satisfied(depend_t * depends, pkg_t * pkg)
 423 {
 424         pkg_t *temp;
 425         int comparison;
 426
 427         if (depends->constraint == NONE)
 428                 return 1;
 429
 430         temp = pkg_new();
 431
 432         parse_version(temp, depends->version);
 433
 434         comparison = pkg_compare_versions(pkg, temp);
 435
 436         pkg_deinit(temp);
 437         free(temp);
 438
 439         if ((depends->constraint == EARLIER) && (comparison < 0))
 440                 return 1;
 441         else if ((depends->constraint == LATER) && (comparison > 0))
 442                 return 1;
 443         else if (comparison == 0)
 444                 return 1;
 445         else if ((depends->constraint == LATER_EQUAL) && (comparison >= 0))
 446                 return 1;
 447         else if ((depends->constraint == EARLIER_EQUAL) && (comparison <= 0))
 448                 return 1;
 449
 450         return 0;
 451 }
 452
 453 int pkg_dependence_satisfiable(depend_t * depend)
 454 {
 455         abstract_pkg_t *apkg = depend->pkg;
 456         abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 457         int n_providers = provider_apkgs->len;
 458         abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 459         pkg_vec_t *pkg_vec;
 460         int n_pkgs;
 461         int i;
 462         int j;
 463
 464         for (i = 0; i < n_providers; i++) {
 465                 abstract_pkg_t *papkg = apkgs[i];
 466                 pkg_vec = papkg->pkgs;
 467                 if (pkg_vec) {
 468                         n_pkgs = pkg_vec->len;
 469                         for (j = 0; j < n_pkgs; j++) {
 470                                 pkg_t *pkg = pkg_vec->pkgs[j];
 471                                 if (version_constraints_satisfied(depend, pkg)) {
 472                                         return 1;
 473                                 }
 474                         }
 475                 }
 476         }
 477         return 0;
 478 }
 479
 480 int pkg_dependence_satisfied(depend_t * depend)
 481 {
 482         abstract_pkg_t *apkg = depend->pkg;
 483         abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 484         int n_providers = provider_apkgs->len;
 485         abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 486         int i;
 487         int n_pkgs;
 488         int j;
 489
 490         for (i = 0; i < n_providers; i++) {
 491                 abstract_pkg_t *papkg = apkgs[i];
 492                 pkg_vec_t *pkg_vec = papkg->pkgs;
 493                 if (pkg_vec) {
 494                         n_pkgs = pkg_vec->len;
 495                         for (j = 0; j < n_pkgs; j++) {
 496                                 pkg_t *pkg = pkg_vec->pkgs[j];
 497                                 if (version_constraints_satisfied(depend, pkg)) {
 498                                         if (pkg->state_status == SS_INSTALLED
 499                                             || pkg->state_status == SS_UNPACKED)
 500                                                 return 1;
 501                                 }
 502                         }
 503                 }
 504         }
 505         return 0;
 506 }
 507
 508 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg)
 509 {
 510         int i;
 511         char *arch1, *arch2;
 512         pkg_t **pkgs = vec->pkgs;
 513         arch1 = pkg_get_architecture(pkg);
 514
 515         for (i = 0; i < vec->len; i++) {
 516                 arch2 = pkg_get_architecture(*(pkgs + i));
 517
 518                 if ((strcmp(pkg->name, (*(pkgs + i))->name) == 0)
 519                     && (pkg_compare_versions(pkg, *(pkgs + i)) == 0)
 520                     && (strcmp(arch1, arch2) == 0))
 521                         return 1;
 522         }
 523         return 0;
 524 }
 525
 526 /**
 527  * pkg_replaces returns 1 if pkg->replaces contains one of replacee's provides and 0
 528  * otherwise.
 529  */
 530 int pkg_replaces(pkg_t * pkg, pkg_t * replacee)
 531 {
 532         abstract_pkg_t **replaces = pkg_get_ptr(pkg, PKG_REPLACES);
 533         abstract_pkg_t **provides = pkg_get_ptr(replacee, PKG_PROVIDES);
 534         abstract_pkg_t **r, **p;
 535
 536         for (r = replaces; r && *r; r++)
 537                 for (p = provides; p && *p; p++)
 538                         if (*r == *p)
 539                                 return 1;
 540
 541         return 0;
 542 }
 543
 544 /**
 545  * pkg_conflicts_abstract returns 1 if pkg->conflicts contains conflictee and 0
 546  * otherwise.
 547  */
 548 int pkg_conflicts_abstract(pkg_t * pkg, abstract_pkg_t * conflictee)
 549 {
 550         compound_depend_t *conflicts, *conflict;
 551
 552         conflicts = pkg_get_ptr(pkg, PKG_CONFLICTS);
 553
 554         int j;
 555         for (conflict = conflicts; conflict->type; conflict++) {
 556                 int possibility_count = conflict->possibility_count;
 557                 struct depend **possibilities = conflict->possibilities;
 558                 for (j = 0; j < possibility_count; j++) {
 559                         if (possibilities[j]->pkg == conflictee) {
 560                                 return 1;
 561                         }
 562                 }
 563         }
 564         return 0;
 565 }
 566
 567 /**
 568  * pkg_conflicts returns 1 if pkg->conflicts contains one of
 569  * conflictee's provides and 0 otherwise.
 570  */
 571 int pkg_conflicts(pkg_t * pkg, pkg_t * conflictee)
 572 {
 573         int j;
 574         int possibility_count;
 575         struct depend **possibilities;
 576         compound_depend_t *conflicts, *conflict;
 577         abstract_pkg_t **conflictee_provides, **provider, *possibility;
 578
 579         conflicts = pkg_get_ptr(pkg, PKG_CONFLICTS);
 580         conflictee_provides = pkg_get_ptr(conflictee, PKG_PROVIDES);
 581
 582         for (conflict = conflicts; conflict->type; conflict++) {
 583                 possibility_count = conflict->possibility_count;
 584                 possibilities = conflict->possibilities;
 585                 for (j = 0; j < possibility_count; j++) {
 586                         possibility = possibilities[j]->pkg;
 587                         for (provider = conflictee_provides; provider && *provider; provider++) {
 588                                 if (possibility == *provider) {
 589                                         return 1;
 590                                 }
 591                         }
 592                 }
 593         }
 594         return 0;
 595 }
 596
 597 static char **merge_unresolved(char **oldstuff, char **newstuff)
 598 {
 599         int oldlen = 0, newlen = 0;
 600         char **result;
 601         int i, j;
 602
 603         if (!newstuff)
 604                 return oldstuff;
 605
 606         while (oldstuff && oldstuff[oldlen])
 607                 oldlen++;
 608         while (newstuff && newstuff[newlen])
 609                 newlen++;
 610
 611         result = xrealloc(oldstuff, sizeof(char *) * (oldlen + newlen + 1));
 612
 613         for (i = oldlen, j = 0; i < (oldlen + newlen); i++, j++)
 614                 *(result + i) = *(newstuff + j);
 615
 616         *(result + i) = NULL;
 617
 618         return result;
 619 }
 620
 621 /*
 622  * a kinda kludgy way to back out depends str from two different arrays (reg'l'r 'n pre)
 623  * this is null terminated, no count is carried around
 624  */
 625 char **add_unresolved_dep(pkg_t * pkg, char **the_lost, int ref_ndx)
 626 {
 627         int count;
 628         char **resized;
 629
 630         count = 0;
 631         while (the_lost && the_lost[count])
 632                 count++;
 633
 634         count++;                /* need one to hold the null */
 635         resized = xrealloc(the_lost, sizeof(char *) * (count + 1));
 636         resized[count - 1] = pkg_depend_str(pkg, ref_ndx);
 637         resized[count] = NULL;
 638
 639         return resized;
 640 }
 641
 642 abstract_pkg_t **init_providelist(pkg_t *pkg, int *count)
 643 {
 644         abstract_pkg_t *ab_pkg;
 645         abstract_pkg_t **provides = pkg_get_ptr(pkg, PKG_PROVIDES);
 646
 647         if (!provides) {
 648                 provides = calloc(2, sizeof(abstract_pkg_t *));
 649
 650                 if (!provides) {
 651                         if (count)
 652                                 *count = 0;
 653
 654                         return NULL;
 655                 }
 656
 657                 ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 658
 659                 if (!ab_pkg->pkgs)
 660                         ab_pkg->pkgs = pkg_vec_alloc();
 661
 662                 abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 663
 664                 provides[0] = ab_pkg;
 665                 provides[1] = NULL;
 666
 667                 if (count)
 668                         *count = 2;
 669
 670                 pkg_set_ptr(pkg, PKG_PROVIDES, provides);
 671         }
 672         else if (count) {
 673                 for (*count = 1; *provides; provides++)
 674                         (*count)++;
 675         }
 676
 677         return provides;
 678 }
 679
 680 void parse_providelist(pkg_t *pkg, char *list)
 681 {
 682         int count = 0;
 683         char *item, *tok;
 684         abstract_pkg_t *ab_pkg, *provided_abpkg, **tmp, **provides;
 685
 686         provides = init_providelist(pkg, &count);
 687         ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 688
 689         if (!provides || !ab_pkg)
 690                 return;
 691
 692         for (item = strtok_r(list, ", ", &tok); item;
 693              count++, item = strtok_r(NULL, ", ", &tok)) {
 694                 tmp = realloc(provides, sizeof(abstract_pkg_t *) * (count + 1));
 695
 696                 if (!tmp)
 697                         break;
 698
 699                 provided_abpkg = ensure_abstract_pkg_by_name(item);
 700
 701                 abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 702
 703                 provides = tmp;
 704                 provides[count - 1] = provided_abpkg;
 705         }
 706
 707         provides[count - 1] = NULL;
 708
 709         pkg_set_ptr(pkg, PKG_PROVIDES, provides);
 710 }
 711
 712 void parse_replacelist(pkg_t *pkg, char *list)
 713 {
 714         int count;
 715         char *item, *tok;
 716         abstract_pkg_t *ab_pkg, *old_abpkg, **tmp, **replaces = NULL;
 717
 718         ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 719
 720         if (!ab_pkg->pkgs)
 721                 ab_pkg->pkgs = pkg_vec_alloc();
 722
 723         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 724
 725         for (count = 1, item = strtok_r(list, ", ", &tok);
 726              item;
 727              count++, item = strtok_r(NULL, ", ", &tok), count++) {
 728                 tmp = realloc(replaces, sizeof(abstract_pkg_t *) * (count + 1));
 729
 730                 if (!tmp)
 731                         break;
 732
 733                 old_abpkg = ensure_abstract_pkg_by_name(item);
 734
 735                 if (!old_abpkg->replaced_by)
 736                         old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 737
 738                 /* if a package pkg both replaces and conflicts old_abpkg,
 739                  * then add it to the replaced_by vector so that old_abpkg
 740                  * will be upgraded to ab_pkg automatically */
 741                 if (pkg_conflicts_abstract(pkg, old_abpkg))
 742                         abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 743
 744                 replaces = tmp;
 745                 replaces[count - 1] = old_abpkg;
 746         }
 747
 748         if (!replaces)
 749                 return;
 750
 751         replaces[count - 1] = NULL;
 752
 753         pkg_set_ptr(pkg, PKG_REPLACES, replaces);
 754 }
 755
 756 void buildProvides(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 757 {
 758 #if 0
 759         int i;
 760
 761         /* every pkg provides itself */
 762         pkg->provides_count++;
 763         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 764         pkg->provides = xcalloc(pkg->provides_count, sizeof(abstract_pkg_t *));
 765         pkg->provides[0] = ab_pkg;
 766         for (i = 1; i < pkg->provides_count; i++) {
 767                 abstract_pkg_t *provided_abpkg =
 768                     ensure_abstract_pkg_by_name(pkg->provides_str[i - 1]);
 769                 free(pkg->provides_str[i - 1]);
 770
 771                 pkg->provides[i] = provided_abpkg;
 772
 773                 abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 774         }
 775         if (pkg->provides_str)
 776                 free(pkg->provides_str);
 777 #endif
 778 }
 779
 780 void buildConflicts(pkg_t * pkg)
 781 {
 782         /*
 783         int i;
 784         compound_depend_t *conflicts, *conflict;
 785
 786         if (!pkg->conflicts_count)
 787                 return;
 788
 789         conflicts = pkg->conflicts =
 790             xcalloc(pkg->conflicts_count, sizeof(compound_depend_t));
 791         for (i = 0; i < pkg->conflicts_count; i++) {
 792                 conflicts->type = CONFLICTS;
 793                 parseDepends(conflicts, pkg->conflicts_str[i]);
 794                 free(pkg->conflicts_str[i]);
 795                 conflicts++;
 796         }
 797         if (pkg->conflicts_str)
 798                 free(pkg->conflicts_str);
 799                 */
 800 }
 801
 802 void buildReplaces(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 803 {
 804 #if 0
 805         int i;
 806
 807         if (!pkg->replaces_count)
 808                 return;
 809
 810         pkg->replaces = xcalloc(pkg->replaces_count, sizeof(abstract_pkg_t *));
 811
 812         for (i = 0; i < pkg->replaces_count; i++) {
 813                 abstract_pkg_t *old_abpkg =
 814                     ensure_abstract_pkg_by_name(pkg->replaces_str[i]);
 815
 816                 pkg->replaces[i] = old_abpkg;
 817                 free(pkg->replaces_str[i]);
 818
 819                 if (!old_abpkg->replaced_by)
 820                         old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 821                 /* if a package pkg both replaces and conflicts old_abpkg,
 822                  * then add it to the replaced_by vector so that old_abpkg
 823                  * will be upgraded to ab_pkg automatically */
 824                 if (pkg_conflicts_abstract(pkg, old_abpkg))
 825                         abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 826         }
 827
 828         if (pkg->replaces_str)
 829                 free(pkg->replaces_str);
 830 #endif
 831 }
 832
 833 void parse_deplist(pkg_t *pkg, enum depend_type type, char *list)
 834 {
 835         int id, count;
 836         char *item, *tok;
 837         compound_depend_t *tmp, *deps;
 838
 839         switch (type)
 840         {
 841         case DEPEND:
 842         case PREDEPEND:
 843         case RECOMMEND:
 844         case SUGGEST:
 845         case GREEDY_DEPEND:
 846                 id = PKG_DEPENDS;
 847                 break;
 848
 849         case CONFLICTS:
 850                 id = PKG_CONFLICTS;
 851                 break;
 852
 853         default:
 854                 return;
 855         }
 856
 857         deps = pkg_get_ptr(pkg, id);
 858
 859         for (tmp = deps, count = 1; tmp && tmp->type; tmp++)
 860                 count++;
 861
 862         for (item = strtok_r(list, ",", &tok); item; item = strtok_r(NULL, ",", &tok), count++) {
 863                 tmp = realloc(deps, sizeof(compound_depend_t) * (count + 1));
 864
 865                 if (!tmp)
 866                         break;
 867
 868                 deps = tmp;
 869
 870                 memset(deps + count - 1, 0, sizeof(compound_depend_t));
 871                 parseDepends(deps + count - 1, item);
 872
 873                 deps[count - 1].type = type;
 874         }
 875
 876         if (!deps)
 877                 return;
 878
 879         memset(deps + count - 1, 0, sizeof(compound_depend_t));
 880         pkg_set_ptr(pkg, id, deps);
 881 }
 882
 883 void buildDepends(pkg_t * pkg)
 884 {
 885 #if 0
 886         unsigned int count;
 887         int i;
 888         compound_depend_t *depends;
 889
 890         if (!
 891             (count =
 892              pkg->pre_depends_count + pkg->depends_count +
 893              pkg->recommends_count + pkg->suggests_count))
 894                 return;
 895
 896         depends = pkg->depends = xcalloc(count, sizeof(compound_depend_t));
 897
 898         for (i = 0; i < pkg->pre_depends_count; i++) {
 899                 parseDepends(depends, pkg->pre_depends_str[i]);
 900                 free(pkg->pre_depends_str[i]);
 901                 depends->type = PREDEPEND;
 902                 depends++;
 903         }
 904         if (pkg->pre_depends_str)
 905                 free(pkg->pre_depends_str);
 906
 907         for (i = 0; i < pkg->depends_count; i++) {
 908                 parseDepends(depends, pkg->depends_str[i]);
 909                 free(pkg->depends_str[i]);
 910                 depends++;
 911         }
 912         if (pkg->depends_str)
 913                 free(pkg->depends_str);
 914
 915         for (i = 0; i < pkg->recommends_count; i++) {
 916                 parseDepends(depends, pkg->recommends_str[i]);
 917                 free(pkg->recommends_str[i]);
 918                 depends->type = RECOMMEND;
 919                 depends++;
 920         }
 921         if (pkg->recommends_str)
 922                 free(pkg->recommends_str);
 923
 924         for (i = 0; i < pkg->suggests_count; i++) {
 925                 parseDepends(depends, pkg->suggests_str[i]);
 926                 free(pkg->suggests_str[i]);
 927                 depends->type = SUGGEST;
 928                 depends++;
 929         }
 930         if (pkg->suggests_str)
 931                 free(pkg->suggests_str);
 932
 933 #endif
 934 }
 935
 936 const char *constraint_to_str(enum version_constraint c)
 937 {
 938         switch (c) {
 939         case NONE:
 940                 return "";
 941         case EARLIER:
 942                 return "< ";
 943         case EARLIER_EQUAL:
 944                 return "<= ";
 945         case EQUAL:
 946                 return "= ";
 947         case LATER_EQUAL:
 948                 return ">= ";
 949         case LATER:
 950                 return "> ";
 951         }
 952
 953         return "";
 954 }
 955
 956 /*
 957  * Returns a printable string for pkg's dependency at the specified idx. The
 958  * resultant string must be passed to free() by the caller.
 959  */
 960 char *pkg_depend_str(pkg_t * pkg, int idx)
 961 {
 962         int i;
 963         unsigned int len;
 964         char *str;
 965         compound_depend_t *cdep = NULL, *p;
 966         depend_t *dep;
 967
 968         for (i = 0, p = pkg_get_ptr(pkg, PKG_DEPENDS); p && p->type; i++, p++)
 969                 if (i == idx) {
 970                         cdep = p;
 971                         break;
 972                 }
 973
 974         if (!cdep)
 975                 return NULL;
 976
 977         len = 0;
 978
 979         /* calculate string length */
 980         for (i = 0; i < cdep->possibility_count; i++) {
 981                 dep = cdep->possibilities[i];
 982
 983                 if (i != 0)
 984                         len += 3;       /* space, pipe, space */
 985
 986                 len += strlen(dep->pkg->name);
 987
 988                 if (dep->version) {
 989                         len += 2;       /* space, left parenthesis */
 990                         len += 3;       /* constraint string (<=, >=, etc), space */
 991                         len += strlen(dep->version);
 992                         len += 1;       /* right parenthesis */
 993                 }
 994         }
 995
 996         str = xmalloc(len + 1); /* +1 for the NULL terminator */
 997         str[0] = '\0';
 998
 999         for (i = 0; i < cdep->possibility_count; i++) {
1000                 dep = cdep->possibilities[i];
1001
1002                 if (i != 0)
1003                         strncat(str, " | ", len);
1004
1005                 strncat(str, dep->pkg->name, len);
1006
1007                 if (dep->version) {
1008                         strncat(str, " (", len);
1009                         strncat(str, constraint_to_str(dep->constraint), len);
1010                         strncat(str, dep->version, len);
1011                         strncat(str, ")", len);
1012                 }
1013         }
1014
1015         return str;
1016 }
1017
1018 void buildDependedUponBy(pkg_t * pkg, abstract_pkg_t * ab_pkg)
1019 {
1020         compound_depend_t *depends;
1021         int othercount;
1022         int j;
1023         abstract_pkg_t *ab_depend;
1024         abstract_pkg_t **temp;
1025
1026         for (depends = pkg_get_ptr(pkg, PKG_DEPENDS); depends && depends->type; depends++) {
1027                 if (depends->type != PREDEPEND
1028                     && depends->type != DEPEND && depends->type != RECOMMEND)
1029                         continue;
1030                 for (j = 0; j < depends->possibility_count; j++) {
1031                         ab_depend = depends->possibilities[j]->pkg;
1032                         if (!ab_depend->depended_upon_by) {
1033                                 ab_depend->depended_upon_by =
1034                                     xcalloc(1, sizeof(abstract_pkg_t *));
1035                         }
1036
1037                         temp = ab_depend->depended_upon_by;
1038                         othercount = 1;
1039                         while (*temp) {
1040                                 temp++;
1041                                 othercount++;
1042                         }
1043                         *temp = ab_pkg;
1044
1045                         ab_depend->depended_upon_by =
1046                             xrealloc(ab_depend->depended_upon_by,
1047                                      (othercount +
1048                                       1) * sizeof(abstract_pkg_t *));
1049
1050                         /* the array may have been moved by realloc */
1051                         temp = ab_depend->depended_upon_by + othercount;
1052                         *temp = NULL;
1053                 }
1054         }
1055 }
1056
1057 static depend_t *depend_init(void)
1058 {
1059         depend_t *d = xcalloc(1, sizeof(depend_t));
1060         d->constraint = NONE;
1061         d->version = NULL;
1062         d->pkg = NULL;
1063
1064         return d;
1065 }
1066
1067 static int parseDepends(compound_depend_t * compound_depend, char *depend_str)
1068 {
1069         int i;
1070         char *depend, *name, *vstr, *rest, *tok = NULL;
1071         depend_t **possibilities = NULL, **tmp;
1072
1073         compound_depend->type = DEPEND;
1074
1075         for (i = 0, depend = strtok_r(depend_str, "|", &tok); depend; i++, depend = strtok_r(NULL, "|", &tok)) {
1076                 name = strtok(depend, " ");
1077                 rest = strtok(NULL, "\n");
1078
1079                 tmp = realloc(possibilities, sizeof(tmp) * (i + 1));
1080
1081                 if (!tmp)
1082                         return -1;
1083
1084                 possibilities = tmp;
1085                 possibilities[i] = depend_init();
1086                 possibilities[i]->pkg = ensure_abstract_pkg_by_name(name);
1087
1088                 if (rest && *rest == '(') {
1089                         vstr = strtok(rest + 1, ")");
1090
1091                         if (!strncmp(vstr, "<<", 2)) {
1092                                 possibilities[i]->constraint = EARLIER;
1093                                 vstr += 2;
1094                         } else if (!strncmp(vstr, "<=", 2)) {
1095                                 possibilities[i]->constraint = EARLIER_EQUAL;
1096                                 vstr += 2;
1097                         } else if (!strncmp(vstr, ">=", 2)) {
1098                                 possibilities[i]->constraint = LATER_EQUAL;
1099                                 vstr += 2;
1100                         } else if (!strncmp(vstr, ">>", 2)) {
1101                                 possibilities[i]->constraint = LATER;
1102                                 vstr += 2;
1103                         } else if (!strncmp(vstr, "=", 1)) {
1104                                 possibilities[i]->constraint = EQUAL;
1105                                 vstr++;
1106                         }
1107                         /* should these be here to support deprecated designations; dpkg does */
1108                         else if (!strncmp(vstr, "<", 1)) {
1109                                 possibilities[i]->constraint = EARLIER_EQUAL;
1110                                 vstr++;
1111                         } else if (!strncmp(vstr, ">", 1)) {
1112                                 possibilities[i]->constraint = LATER_EQUAL;
1113                                 vstr++;
1114                         }
1115
1116                         possibilities[i]->version = trim_xstrdup(vstr);
1117                         rest = strtok(NULL, " ");
1118                 }
1119                 else {
1120                         rest = strtok(rest, " ");
1121                 }
1122
1123                 if (rest && *rest == '*')
1124                         compound_depend->type = GREEDY_DEPEND;
1125         }
1126
1127         compound_depend->possibility_count = i;
1128         compound_depend->possibilities = possibilities;
1129
1130         return 0;
1131 }
1132
1133 compound_depend_t *pkg_get_depends(pkg_t *pkg, enum depend_type type)
1134 {
1135         compound_depend_t *dep;
1136
1137         for (dep = pkg_get_ptr(pkg, PKG_DEPENDS); dep && dep->type; dep++)
1138                 if (type == UNSPEC || dep->type == type)
1139                         return dep;
1140
1141         return NULL;
1142 }