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 "includes.h"
  19 #include <errno.h>
  20 #include <ctype.h>
  21
  22 #include "pkg.h"
  23 #include "opkg_utils.h"
  24 #include "pkg_hash.h"
  25 #include "opkg_message.h"
  26 #include "pkg_parse.h"
  27 #include "hash_table.h"
  28 #include "libbb/libbb.h"
  29
  30 static int parseDepends(compound_depend_t *compound_depend, hash_table_t * hash, char * depend_str);
  31 static depend_t * depend_init(void);
  32 static void depend_deinit(depend_t *d);
  33 static char ** add_unresolved_dep(pkg_t * pkg, char ** the_lost, int ref_ndx);
  34 static char ** merge_unresolved(char ** oldstuff, char ** newstuff);
  35 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg);
  36
  37 static int pkg_installed_and_constraint_satisfied(pkg_t *pkg, void *cdata)
  38 {
  39      depend_t *depend = (depend_t *)cdata;
  40      if ((pkg->state_status == SS_INSTALLED || pkg->state_status == SS_UNPACKED) && 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 ndependences or negative error value */
  56 int pkg_hash_fetch_unsatisfied_dependencies(opkg_conf_t *conf, pkg_t * pkg,
  57                                             pkg_vec_t *unsatisfied, char *** unresolved)
  58 {
  59      pkg_t * satisfier_entry_pkg;
  60      int i, j, k;
  61      int count, found;
  62      char ** the_lost;
  63      abstract_pkg_t * ab_pkg;
  64
  65      /*
  66       * this is a setup to check for redundant/cyclic dependency checks,
  67       * which are marked at the abstract_pkg level
  68       */
  69      if (!(ab_pkg = pkg->parent)) {
  70           fprintf(stderr, "%s:%d: something terribly wrong with pkg %s\n", __FUNCTION__, __LINE__, pkg->name);
  71           *unresolved = NULL;
  72           return 0;
  73      }
  74      if (ab_pkg->dependencies_checked) {    /* avoid duplicate or cyclic checks */
  75           *unresolved = NULL;
  76           return 0;
  77      } else {
  78           ab_pkg->dependencies_checked = 1;  /* mark it for subsequent visits */
  79      }
  80      /**/
  81
  82      count = pkg->pre_depends_count + pkg->depends_count + pkg->recommends_count + pkg->suggests_count;
  83      if (!count){
  84           *unresolved = NULL;
  85           return 0;
  86      }
  87
  88      the_lost = NULL;
  89
  90      /* foreach dependency */
  91      for (i = 0; i < count; i++) {
  92           compound_depend_t * compound_depend = &pkg->depends[i];
  93           depend_t ** possible_satisfiers = compound_depend->possibilities;;
  94           found = 0;
  95           satisfier_entry_pkg = NULL;
  96
  97           if (compound_depend->type == GREEDY_DEPEND) {
  98                /* foreach possible satisfier */
  99                for (j = 0; j < compound_depend->possibility_count; j++) {
 100                     /* foreach provided_by, which includes the abstract_pkg itself */
 101                     abstract_pkg_t *abpkg = possible_satisfiers[j]->pkg;
 102                     abstract_pkg_vec_t *ab_provider_vec = abpkg->provided_by;
 103                     int nposs = ab_provider_vec->len;
 104                     abstract_pkg_t **ab_providers = ab_provider_vec->pkgs;
 105                     int l;
 106                     for (l = 0; l < nposs; l++) {
 107                          pkg_vec_t *test_vec = ab_providers[l]->pkgs;
 108                          /* if no depends on this one, try the first package that Provides this one */
 109                          if (!test_vec){   /* no pkg_vec hooked up to the abstract_pkg!  (need another feed?) */
 110                               continue;
 111                          }
 112
 113                          /* cruise this possiblity's pkg_vec looking for an installed version */
 114                          for (k = 0; k < test_vec->len; k++) {
 115                               pkg_t *pkg_scout = test_vec->pkgs[k];
 116                               /* not installed, and not already known about? */
 117                               if ((pkg_scout->state_want != SW_INSTALL)
 118                                   && !pkg_scout->parent->dependencies_checked
 119                                   && !is_pkg_in_pkg_vec(unsatisfied, pkg_scout)) {
 120                                    char ** newstuff = NULL;
 121                                    int rc;
 122                                    pkg_vec_t *tmp_vec = pkg_vec_alloc ();
 123                                    /* check for not-already-installed dependencies */
 124                                    rc = pkg_hash_fetch_unsatisfied_dependencies(conf,
 125                                                                                 pkg_scout,
 126                                                                                 tmp_vec,
 127                                                                                 &newstuff);
 128                                    if (newstuff == NULL) {
 129                                         int i;
 130                                         int ok = 1;
 131                                         for (i = 0; i < rc; i++) {
 132                                             pkg_t *p = tmp_vec->pkgs[i];
 133                                             if (p->state_want == SW_INSTALL)
 134                                                 continue;
 135                                             opkg_message(conf, OPKG_DEBUG, "not installing %s due to requirement for %s\n", pkg_scout->name, p->name);
 136                                             ok = 0;
 137                                             break;
 138                                         }
 139                                         pkg_vec_free (tmp_vec);
 140                                         if (ok) {
 141                                             /* mark this one for installation */
 142                                             opkg_message(conf, OPKG_NOTICE, "Adding satisfier for greedy dependence: %s\n", pkg_scout->name);
 143                                             pkg_vec_insert(unsatisfied, pkg_scout);
 144                                         }
 145                                    } else  {
 146                                         opkg_message(conf, OPKG_DEBUG, "not installing %s due to broken depends \n", pkg_scout->name);
 147                                         free (newstuff);
 148                                    }
 149                               }
 150                          }
 151                     }
 152                }
 153
 154                continue;
 155           }
 156
 157           /* foreach possible satisfier, look for installed package  */
 158           for (j = 0; j < compound_depend->possibility_count; j++) {
 159                /* foreach provided_by, which includes the abstract_pkg itself */
 160                depend_t *dependence_to_satisfy = possible_satisfiers[j];
 161                abstract_pkg_t *satisfying_apkg = possible_satisfiers[j]->pkg;
 162                pkg_t *satisfying_pkg =
 163                     pkg_hash_fetch_best_installation_candidate(conf, satisfying_apkg,
 164                                                                pkg_installed_and_constraint_satisfied,
 165                                                                dependence_to_satisfy, 1, NULL);
 166                /* Being that I can't test constraing in pkg_hash, I will test it here */
 167                if (satisfying_pkg != NULL) {
 168                   if (!pkg_installed_and_constraint_satisfied ( satisfying_pkg,dependence_to_satisfy)) {
 169                       satisfying_pkg = NULL;
 170                   }
 171                }
 172                opkg_message(conf, OPKG_DEBUG, "%s:%d: satisfying_pkg=%p \n", __FILE__, __LINE__, satisfying_pkg);
 173                if (satisfying_pkg != NULL) {
 174                     found = 1;
 175                     break;
 176                }
 177
 178           }
 179           /* if nothing installed matches, then look for uninstalled satisfier */
 180           if (!found) {
 181                /* foreach possible satisfier, look for installed package  */
 182                for (j = 0; j < compound_depend->possibility_count; j++) {
 183                     /* foreach provided_by, which includes the abstract_pkg itself */
 184                     depend_t *dependence_to_satisfy = possible_satisfiers[j];
 185                     abstract_pkg_t *satisfying_apkg = possible_satisfiers[j]->pkg;
 186                     pkg_t *satisfying_pkg =
 187                          pkg_hash_fetch_best_installation_candidate(conf, satisfying_apkg,
 188                                                                     pkg_constraint_satisfied,
 189                                                                     dependence_to_satisfy, 1, NULL);
 190                     /* Being that I can't test constraing in pkg_hash, I will test it here too */
 191                     if (satisfying_pkg != NULL) {
 192                          if (!pkg_constraint_satisfied ( satisfying_pkg,dependence_to_satisfy)) {
 193                             satisfying_pkg = NULL;
 194                          }
 195                     }
 196
 197                     /* user request overrides package recommendation */
 198                     if (satisfying_pkg != NULL
 199                         && (compound_depend->type == RECOMMEND || compound_depend->type == SUGGEST)
 200                         && (satisfying_pkg->state_want == SW_DEINSTALL || satisfying_pkg->state_want == SW_PURGE)) {
 201                          opkg_message (conf, OPKG_NOTICE, "%s: ignoring recommendation for %s at user request\n",
 202                                        pkg->name, satisfying_pkg->name);
 203                          continue;
 204                     }
 205
 206                     opkg_message(conf, OPKG_DEBUG, "%s:%d: satisfying_pkg=%p\n", __FILE__, __LINE__, satisfying_pkg);
 207                     if (satisfying_pkg != NULL) {
 208                          satisfier_entry_pkg = satisfying_pkg;
 209                          break;
 210                     }
 211                }
 212           }
 213
 214           /* we didn't find one, add something to the unsatisfied vector */
 215           if (!found) {
 216                if (!satisfier_entry_pkg) {
 217                     /* failure to meet recommendations is not an error */
 218                     if (compound_depend->type != RECOMMEND && compound_depend->type != SUGGEST)
 219                          the_lost = add_unresolved_dep(pkg, the_lost, i);
 220                     else
 221                          opkg_message (conf, OPKG_NOTICE, "%s: unsatisfied recommendation for %s\n",
 222                                        pkg->name, compound_depend->possibilities[0]->pkg->name);
 223                }
 224                else {
 225                     if (compound_depend->type == SUGGEST) {
 226                          /* just mention it politely */
 227                          opkg_message (conf, OPKG_NOTICE, "package %s suggests installing %s\n",
 228                                        pkg->name, satisfier_entry_pkg->name);
 229                     } else {
 230                          char ** newstuff = NULL;
 231
 232                          if (satisfier_entry_pkg != pkg &&
 233                              !is_pkg_in_pkg_vec(unsatisfied, satisfier_entry_pkg)) {
 234                               pkg_vec_insert(unsatisfied, satisfier_entry_pkg);
 235                               pkg_hash_fetch_unsatisfied_dependencies(conf,
 236                                                                       satisfier_entry_pkg,
 237                                                                       unsatisfied,
 238                                                                       &newstuff);
 239                               the_lost = merge_unresolved(the_lost, newstuff);
 240                          }
 241                     }
 242                }
 243           }
 244      }
 245      *unresolved = the_lost;
 246
 247      return unsatisfied->len;
 248 }
 249
 250 /*checking for conflicts !in replaces
 251   If a packages conflicts with another but is also replacing it, I should not consider it a
 252   really conflicts
 253   returns 0 if conflicts <> replaces or 1 if conflicts == replaces
 254 */
 255 int is_pkg_a_replaces(pkg_t *pkg_scout,pkg_t *pkg)
 256 {
 257     int i ;
 258     int replaces_count = pkg->replaces_count;
 259     abstract_pkg_t **replaces;
 260
 261     if (pkg->replaces_count==0)    // No replaces, it's surely a conflict
 262         return 0;
 263
 264     replaces = pkg->replaces;
 265
 266     for (i = 0; i < replaces_count; i++) {
 267         if (strcmp(pkg_scout->name,pkg->replaces[i]->name)==0) {      // Found
 268             opkg_message(NULL, OPKG_DEBUG2, "Seems I've found a replace %s %s \n",pkg_scout->name,pkg->replaces[i]->name);
 269             return 1;
 270         }
 271     }
 272     return 0;
 273
 274 }
 275
 276
 277 /* Abhaya: added support for conflicts */
 278 pkg_vec_t * pkg_hash_fetch_conflicts(hash_table_t * hash, pkg_t * pkg)
 279 {
 280     pkg_vec_t * installed_conflicts, * test_vec;
 281     compound_depend_t * conflicts;
 282     depend_t ** possible_satisfiers;
 283     depend_t * possible_satisfier;
 284     int i, j, k;
 285     int count;
 286     abstract_pkg_t * ab_pkg;
 287     pkg_t **pkg_scouts;
 288     pkg_t *pkg_scout;
 289
 290     /*
 291      * this is a setup to check for redundant/cyclic dependency checks,
 292      * which are marked at the abstract_pkg level
 293      */
 294     if(!(ab_pkg = pkg->parent)){
 295         fprintf(stderr, "dependency check error.  pkg %s isn't in hash table\n", pkg->name);
 296         return (pkg_vec_t *)NULL;
 297     }
 298
 299     conflicts = pkg->conflicts;
 300     if(!conflicts){
 301         return (pkg_vec_t *)NULL;
 302     }
 303     installed_conflicts = pkg_vec_alloc();
 304
 305     count = pkg->conflicts_count;
 306
 307
 308
 309     /* foreach conflict */
 310     for(i = 0; i < pkg->conflicts_count; i++){
 311
 312         possible_satisfiers = conflicts->possibilities;
 313
 314         /* foreach possible satisfier */
 315         for(j = 0; j < conflicts->possibility_count; j++){
 316             possible_satisfier = possible_satisfiers[j];
 317             if (!possible_satisfier)
 318                 fprintf(stderr, "%s:%d: possible_satisfier is null\n", __FUNCTION__, __LINE__);
 319             if (!possible_satisfier->pkg)
 320                 fprintf(stderr, "%s:%d: possible_satisfier->pkg is null\n", __FUNCTION__, __LINE__);
 321             test_vec = possible_satisfier->pkg->pkgs;
 322             if (test_vec) {
 323                 /* pkg_vec found, it is an actual package conflict
 324                  * cruise this possiblity's pkg_vec looking for an installed version */
 325                 pkg_scouts = test_vec->pkgs;
 326                 for(k = 0; k < test_vec->len; k++){
 327                     pkg_scout = pkg_scouts[k];
 328                     if (!pkg_scout) {
 329                         fprintf(stderr,  "%s: null pkg scout\n", __FUNCTION__);
 330                         continue;
 331                     }
 332                     if ((pkg_scout->state_status == SS_INSTALLED || pkg_scout->state_want == SW_INSTALL) &&
 333                        version_constraints_satisfied(possible_satisfier, pkg_scout) && !is_pkg_a_replaces(pkg_scout,pkg)){
 334                         if (!is_pkg_in_pkg_vec(installed_conflicts, pkg_scout)){
 335                             pkg_vec_insert(installed_conflicts, pkg_scout);
 336                         }
 337                     }
 338                 }
 339             }
 340         }
 341         conflicts++;
 342     }
 343
 344     if (installed_conflicts->len)
 345             return installed_conflicts;
 346     pkg_vec_free(installed_conflicts);
 347         return (pkg_vec_t *)NULL;
 348 }
 349
 350 int version_constraints_satisfied(depend_t * depends, pkg_t * pkg)
 351 {
 352     pkg_t * temp;
 353     int comparison;
 354
 355     if(depends->constraint == NONE)
 356         return 1;
 357
 358     temp = pkg_new();
 359
 360     parseVersion(temp, depends->version);
 361
 362     comparison = pkg_compare_versions(pkg, temp);
 363
 364     free (temp->version);
 365     free(temp);
 366
 367     if((depends->constraint == EARLIER) &&
 368        (comparison < 0))
 369         return 1;
 370     else if((depends->constraint == LATER) &&
 371             (comparison > 0))
 372         return 1;
 373     else if(comparison == 0)
 374         return 1;
 375     else if((depends->constraint == LATER_EQUAL) &&
 376             (comparison >= 0))
 377         return 1;
 378     else if((depends->constraint == EARLIER_EQUAL) &&
 379             (comparison <= 0))
 380         return 1;
 381
 382     return 0;
 383 }
 384
 385 int pkg_dependence_satisfiable(opkg_conf_t *conf, depend_t *depend)
 386 {
 387      abstract_pkg_t *apkg = depend->pkg;
 388      abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 389      int n_providers = provider_apkgs->len;
 390      abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 391      pkg_vec_t *pkg_vec;
 392      int n_pkgs ;
 393      int i;
 394      int j;
 395
 396      for (i = 0; i < n_providers; i++) {
 397           abstract_pkg_t *papkg = apkgs[i];
 398           pkg_vec = papkg->pkgs;
 399           if (pkg_vec) {
 400                n_pkgs = pkg_vec->len;
 401                for (j = 0; j < n_pkgs; j++) {
 402                     pkg_t *pkg = pkg_vec->pkgs[j];
 403                     if (version_constraints_satisfied(depend, pkg)) {
 404                          return 1;
 405                     }
 406                }
 407           }
 408      }
 409      return 0;
 410 }
 411
 412 int pkg_dependence_satisfied(opkg_conf_t *conf, depend_t *depend)
 413 {
 414      abstract_pkg_t *apkg = depend->pkg;
 415      abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 416      int n_providers = provider_apkgs->len;
 417      abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 418      int i;
 419      int n_pkgs;
 420      int j;
 421
 422      for (i = 0; i < n_providers; i++) {
 423           abstract_pkg_t *papkg = apkgs[i];
 424           pkg_vec_t *pkg_vec = papkg->pkgs;
 425           if (pkg_vec) {
 426                n_pkgs = pkg_vec->len;
 427                for (j = 0; j < n_pkgs; j++) {
 428                     pkg_t *pkg = pkg_vec->pkgs[j];
 429                     if (version_constraints_satisfied(depend, pkg)) {
 430                          if (pkg->state_status == SS_INSTALLED || pkg->state_status == SS_UNPACKED)
 431                               return 1;
 432                     }
 433                }
 434           }
 435      }
 436      return 0;
 437 }
 438
 439 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg)
 440 {
 441     int i;
 442     pkg_t ** pkgs = vec->pkgs;
 443
 444     for(i = 0; i < vec->len; i++)
 445         if((strcmp(pkg->name, (*(pkgs + i))->name) == 0)
 446            && (pkg_compare_versions(pkg, *(pkgs + i)) == 0)
 447            && (strcmp(pkg->architecture, (*(pkgs + i))->architecture) == 0))
 448             return 1;
 449     return 0;
 450 }
 451
 452
 453 #ifdef DeadCode
 454 /**
 455  * pkg_has_common_provides returns 1 if pkg and replacee both provide
 456  * the same abstract package and 0 otherwise.
 457  */
 458 int pkg_has_common_provides(pkg_t *pkg, pkg_t *replacee)
 459 {
 460      abstract_pkg_t **provides = pkg->provides;
 461      int provides_count = pkg->provides_count;
 462      abstract_pkg_t **replacee_provides = replacee->provides;
 463      int replacee_provides_count = replacee->provides_count;
 464      int i, j;
 465      for (i = 0; i < provides_count; i++) {
 466           abstract_pkg_t *apkg = provides[i];
 467           for (j = 0; j < replacee_provides_count; j++) {
 468                abstract_pkg_t *replacee_apkg = replacee_provides[i];
 469                if (apkg == replacee_apkg)
 470                     return 1;
 471           }
 472      }
 473      return 0;
 474 }
 475 #endif
 476
 477 /**
 478  * pkg_provides_abstract returns 1 if pkg->provides contains providee
 479  * and 0 otherwise.
 480  */
 481 int pkg_provides_abstract(pkg_t *pkg, abstract_pkg_t *providee)
 482 {
 483      abstract_pkg_t **provides = pkg->provides;
 484      int provides_count = pkg->provides_count;
 485      int i;
 486      for (i = 0; i < provides_count; i++) {
 487           if (provides[i] == providee)
 488                return 1;
 489      }
 490      return 0;
 491 }
 492
 493 /**
 494  * pkg_replaces returns 1 if pkg->replaces contains one of replacee's provides and 0
 495  * otherwise.
 496  */
 497 int pkg_replaces(pkg_t *pkg, pkg_t *replacee)
 498 {
 499      abstract_pkg_t **replaces = pkg->replaces;
 500      int replaces_count = pkg->replaces_count;
 501      /* abstract_pkg_t **replacee_provides = pkg->provides;
 502      int replacee_provides_count = pkg->provides_count; */
 503      int i, j;
 504      for (i = 0; i < replaces_count; i++) {
 505           abstract_pkg_t *abstract_replacee = replaces[i];
 506           for (j = 0; j < replaces_count; j++) {
 507    /*            opkg_message(NULL, OPKG_DEBUG2, "Searching pkg-name %s repprovname %s absrepname %s \n",
 508                  pkg->name,replacee->provides[j]->name, abstract_replacee->name); */
 509                if (replacee->provides[j] == abstract_replacee)
 510                     return 1;
 511           }
 512      }
 513      return 0;
 514 }
 515
 516
 517 /**
 518  * pkg_conflicts_abstract returns 1 if pkg->conflicts contains conflictee and 0
 519  * otherwise.
 520  */
 521 int pkg_conflicts_abstract(pkg_t *pkg, abstract_pkg_t *conflictee)
 522 {
 523      compound_depend_t *conflicts = pkg->conflicts;
 524      int conflicts_count = pkg->conflicts_count;
 525      int i, j;
 526      for (i = 0; i < conflicts_count; i++) {
 527           int possibility_count = conflicts[i].possibility_count;
 528           struct depend **possibilities = conflicts[i].possibilities;
 529           for (j = 0; j < possibility_count; j++) {
 530                if (possibilities[j]->pkg == conflictee) {
 531                     return 1;
 532                }
 533           }
 534      }
 535      return 0;
 536 }
 537
 538 /**
 539  * pkg_conflicts returns 1 if pkg->conflicts contains one of
 540  * conflictee's provides and 0 otherwise.
 541  */
 542 int pkg_conflicts(pkg_t *pkg, pkg_t *conflictee)
 543 {
 544      compound_depend_t *conflicts = pkg->conflicts;
 545      int conflicts_count = pkg->conflicts_count;
 546      abstract_pkg_t **conflictee_provides = conflictee->provides;
 547      int conflictee_provides_count = conflictee->provides_count;
 548      int i, j, k;
 549      int possibility_count;
 550      struct depend **possibilities;
 551      abstract_pkg_t *possibility ;
 552
 553      for (i = 0; i < conflicts_count; i++) {
 554           possibility_count = conflicts[i].possibility_count;
 555           possibilities = conflicts[i].possibilities;
 556           for (j = 0; j < possibility_count; j++) {
 557                possibility = possibilities[j]->pkg;
 558                for (k = 0; k < conflictee_provides_count; k++) {
 559                     if (possibility == conflictee_provides[k]) {
 560                          return 1;
 561                     }
 562                }
 563           }
 564      }
 565      return 0;
 566 }
 567
 568 static char ** merge_unresolved(char ** oldstuff, char ** newstuff)
 569 {
 570     int oldlen = 0, newlen = 0;
 571     char ** result;
 572     int i, j;
 573
 574     if(!newstuff)
 575         return oldstuff;
 576
 577     while(oldstuff && oldstuff[oldlen]) oldlen++;
 578     while(newstuff && newstuff[newlen]) newlen++;
 579
 580     result = xrealloc(oldstuff, sizeof(char *) * (oldlen + newlen + 1));
 581
 582     for(i = oldlen, j = 0; i < (oldlen + newlen); i++, j++)
 583         *(result + i) = *(newstuff + j);
 584
 585     *(result + i) = NULL;
 586
 587     return result;
 588 }
 589
 590 /*
 591  * a kinda kludgy way to back out depends str from two different arrays (reg'l'r 'n pre)
 592  * this is null terminated, no count is carried around
 593  */
 594 char ** add_unresolved_dep(pkg_t * pkg, char ** the_lost, int ref_ndx)
 595 {
 596     int count;
 597     char ** resized;
 598     char *depend_str = pkg_depend_str(pkg, ref_ndx);
 599
 600     count = 0;
 601     while(the_lost && the_lost[count]) count++;
 602
 603     count++;  /* need one to hold the null */
 604     resized = xrealloc(the_lost, sizeof(char *) * (count + 1));
 605     resized[count - 1] = xstrdup(depend_str);
 606     resized[count] = NULL;
 607
 608     return resized;
 609 }
 610
 611 int buildProvides(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 612 {
 613     int i, j;
 614
 615     /* every pkg provides itself */
 616     abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 617
 618     if (!pkg->provides_count)
 619       return 0;
 620     if (pkg->provides)
 621       return 0;
 622
 623     pkg->provides = xcalloc((pkg->provides_count + 1), sizeof(abstract_pkg_t *));
 624     pkg->provides[0] = ab_pkg;
 625
 626     // if (strcmp(ab_pkg->name, pkg->name))
 627     //     fprintf(stderr, __FUNCTION__ ": ab_pkg=%s pkg=%s\n", ab_pkg->name, pkg->name);
 628
 629     for(i = 0; i < pkg->provides_count; i++){
 630          abstract_pkg_t *provided_abpkg = ensure_abstract_pkg_by_name(hash, pkg->provides_str[i]);
 631
 632         pkg->provides[i+1] = provided_abpkg;
 633
 634         j = 0;
 635         abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 636     }
 637     return 0;
 638 }
 639
 640 /* Abhaya: added conflicts support */
 641 int buildConflicts(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 642 {
 643     int i;
 644     compound_depend_t * conflicts;
 645
 646     if (!pkg->conflicts_count)
 647         return 0;
 648
 649     conflicts = pkg->conflicts = xcalloc(pkg->conflicts_count, sizeof(compound_depend_t));
 650     for (i = 0; i < pkg->conflicts_count; i++) {
 651          conflicts->type = CONFLICTS;
 652          parseDepends(conflicts, hash,
 653                       pkg->conflicts_str[i]);
 654          conflicts++;
 655     }
 656     return 0;
 657 }
 658
 659 int buildReplaces(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 660 {
 661      int i, j;
 662
 663      if (!pkg->replaces_count)
 664           return 0;
 665
 666      pkg->replaces = xcalloc(pkg->replaces_count, sizeof(abstract_pkg_t *));
 667
 668      for(i = 0; i < pkg->replaces_count; i++){
 669           abstract_pkg_t *old_abpkg = ensure_abstract_pkg_by_name(hash, pkg->replaces_str[i]);
 670
 671           pkg->replaces[i] = old_abpkg;
 672
 673           j = 0;
 674           if (!old_abpkg->replaced_by)
 675                old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 676           /* if a package pkg both replaces and conflicts old_abpkg,
 677            * then add it to the replaced_by vector so that old_abpkg
 678            * will be upgraded to ab_pkg automatically */
 679           if (pkg_conflicts_abstract(pkg, old_abpkg))
 680                abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 681      }
 682      return 0;
 683 }
 684
 685 int buildDepends(hash_table_t * hash, pkg_t * pkg)
 686 {
 687      int count;
 688      int i;
 689      compound_depend_t * depends;
 690
 691      if(!(count = pkg->pre_depends_count + pkg->depends_count + pkg->recommends_count + pkg->suggests_count))
 692           return 0;
 693
 694      if (0 && pkg->pre_depends_count)
 695           fprintf(stderr, "pkg=%s pre_depends_count=%d depends_count=%d\n",
 696                   pkg->name, pkg->pre_depends_count, pkg->depends_count);
 697      depends = pkg->depends = xcalloc(count, sizeof(compound_depend_t));
 698
 699      for(i = 0; i < pkg->pre_depends_count; i++){
 700           parseDepends(depends, hash, pkg->pre_depends_str[i]);
 701           if (0 && pkg->pre_depends_count)
 702                fprintf(stderr, " pre_depends_str=%s depends=%p possibility_count=%x\n",
 703                        pkg->pre_depends_str[i], depends, depends->possibility_count);
 704           depends->type = PREDEPEND;
 705           depends++;
 706      }
 707
 708      for(i = 0; i < pkg->recommends_count; i++){
 709           parseDepends(depends, hash, pkg->recommends_str[i]);
 710           if (0 && pkg->recommends_count)
 711                fprintf(stderr, " recommends_str=%s depends=%p possibility_count=%x\n",
 712                        pkg->recommends_str[i], depends, depends->possibility_count);
 713           depends->type = RECOMMEND;
 714           depends++;
 715      }
 716
 717      for(i = 0; i < pkg->suggests_count; i++){
 718           parseDepends(depends, hash, pkg->suggests_str[i]);
 719           if (0 && pkg->suggests_count)
 720                fprintf(stderr, " suggests_str=%s depends=%p possibility_count=%x\n",
 721                        pkg->suggests_str[i], depends, depends->possibility_count);
 722           depends->type = SUGGEST;
 723           depends++;
 724      }
 725
 726      for(i = 0; i < pkg->depends_count; i++){
 727           parseDepends(depends, hash, pkg->depends_str[i]);
 728           if (0 && pkg->depends_count)
 729                fprintf(stderr, " depends_str=%s depends=%p possibility_count=%x\n",
 730                        pkg->depends_str[i], depends, depends->possibility_count);
 731           depends++;
 732      }
 733      return 0;
 734 }
 735
 736 /*
 737  * pkg_depend_string: returns the depends string specified by index.
 738  *   All 4 kinds of dependences: dependence, pre-dependence, recommend, and suggest are number starting from 0.
 739  *   [0,npredepends) -> returns pre_depends_str[index]
 740  *   [npredepends,npredepends+nrecommends) -> returns recommends_str[index]
 741  *   [npredepends+nrecommends,npredepends+nrecommends+nsuggests) -> returns recommends_str[index]
 742  *   [npredepends+nrecommends+nsuggests,npredepends+nrecommends+nsuggests+ndepends) -> returns depends_str[index]
 743  */
 744 char *pkg_depend_str(pkg_t *pkg, int index)
 745 {
 746      if (index < pkg->pre_depends_count) {
 747           return pkg->pre_depends_str[index];
 748      }
 749      index -= pkg->pre_depends_count;
 750
 751      if (index < pkg->recommends_count) {
 752           return pkg->recommends_str[index];
 753      }
 754      index -= pkg->recommends_count;
 755
 756      if (index < pkg->suggests_count) {
 757           return pkg->suggests_str[index];
 758      }
 759      index -= pkg->suggests_count;
 760
 761      if (index < pkg->depends_count) {
 762           return pkg->depends_str[index];
 763      }
 764      fprintf(stderr, "pkg_depend_str: index %d out of range for pkg=%s\n", index, pkg->name);
 765      return NULL;
 766 }
 767
 768 void freeDepends(pkg_t *pkg)
 769 {
 770     int i;
 771
 772     if (pkg == NULL || pkg->depends == NULL) {
 773         return;
 774     }
 775
 776     fprintf(stderr, "Freeing depends=%p\n", pkg->depends);
 777     for (i=0; i < pkg->depends->possibility_count; i++) {
 778         depend_deinit(pkg->depends->possibilities[i]);
 779     }
 780     free(pkg->depends->possibilities);
 781     free(pkg->depends);
 782     pkg->depends = NULL;
 783 }
 784
 785 void buildDependedUponBy(pkg_t * pkg, abstract_pkg_t * ab_pkg)
 786 {
 787      compound_depend_t * depends;
 788      int count, othercount;
 789      int i, j;
 790      abstract_pkg_t * ab_depend;
 791      abstract_pkg_t ** temp;
 792
 793      count = pkg->pre_depends_count + pkg->depends_count;
 794      depends = pkg->depends;
 795
 796           if (0 && pkg->pre_depends_count)
 797                fprintf(stderr, "pkg=%s pre_depends_count=%d depends_count=%d\n",
 798                        pkg->name, pkg->pre_depends_count, pkg->depends_count);
 799      for (i = 0; i < count; i++) {
 800           if (0 && pkg->pre_depends_count)
 801                fprintf(stderr, "  i=%d possibility_count=%x depends=%p\n", i, depends->possibility_count, depends);
 802           for (j = 0; j < depends->possibility_count; j++){
 803                ab_depend = depends->possibilities[j]->pkg;
 804                if(!ab_depend->depended_upon_by)
 805                     ab_depend->depended_upon_by = xcalloc(1, sizeof(abstract_pkg_t *));
 806
 807                temp = ab_depend->depended_upon_by;
 808                othercount = 1;
 809                while(*temp){
 810                     temp++;
 811                     othercount++;
 812                }
 813                *temp = ab_pkg;
 814
 815                ab_depend->depended_upon_by = xrealloc(ab_depend->depended_upon_by,
 816                                                                         (othercount + 1) * sizeof(abstract_pkg_t *));
 817                /* the array may have moved */
 818                temp = ab_depend->depended_upon_by + othercount;
 819                *temp = NULL;
 820           }
 821           depends++;
 822      }
 823 }
 824
 825 static depend_t * depend_init(void)
 826 {
 827     depend_t * d = xcalloc(1, sizeof(depend_t));
 828     d->constraint = NONE;
 829     d->version = NULL;
 830     d->pkg = NULL;
 831
 832     return d;
 833 }
 834
 835 static void depend_deinit(depend_t *d)
 836 {
 837     free(d);
 838 }
 839
 840 static int parseDepends(compound_depend_t *compound_depend,
 841                         hash_table_t * hash, char * depend_str)
 842 {
 843      char * pkg_name, buffer[2048];
 844      int num_of_ors = 0;
 845      int i;
 846      char * src, * dest;
 847      depend_t ** possibilities;
 848
 849      /* first count the number of ored possibilities for satisfying dependency */
 850      src = depend_str;
 851      while(*src)
 852           if(*src++ == '|')
 853                num_of_ors++;
 854
 855      compound_depend->type = DEPEND;
 856
 857      compound_depend->possibility_count = num_of_ors + 1;
 858      possibilities = xcalloc((num_of_ors + 1), sizeof(depend_t *) );
 859      compound_depend->possibilities = possibilities;
 860
 861      src = depend_str;
 862      for(i = 0; i < num_of_ors + 1; i++){
 863           possibilities[i] = depend_init();
 864           /* gobble up just the name first */
 865           dest = buffer;
 866           while(*src &&
 867                 !isspace(*src) &&
 868                 (*src != '(') &&
 869                 (*src != '*') &&
 870                 (*src != '|'))
 871                *dest++ = *src++;
 872           *dest = '\0';
 873           pkg_name = trim_alloc(buffer);
 874           if (pkg_name == NULL )
 875                return -ENOMEM;
 876
 877           /* now look at possible version info */
 878
 879           /* skip to next chars */
 880           if(isspace(*src))
 881                while(*src && isspace(*src)) src++;
 882
 883           /* extract constraint and version */
 884           if(*src == '('){
 885                src++;
 886                if(!strncmp(src, "<<", 2)){
 887                     possibilities[i]->constraint = EARLIER;
 888                     src += 2;
 889                }
 890                else if(!strncmp(src, "<=", 2)){
 891                     possibilities[i]->constraint = EARLIER_EQUAL;
 892                     src += 2;
 893                }
 894                else if(!strncmp(src, ">=", 2)){
 895                     possibilities[i]->constraint = LATER_EQUAL;
 896                     src += 2;
 897                }
 898                else if(!strncmp(src, ">>", 2)){
 899                     possibilities[i]->constraint = LATER;
 900                     src += 2;
 901                }
 902                else if(!strncmp(src, "=", 1)){
 903                     possibilities[i]->constraint = EQUAL;
 904                     src++;
 905                }
 906                /* should these be here to support deprecated designations; dpkg does */
 907                else if(!strncmp(src, "<", 1)){
 908                     possibilities[i]->constraint = EARLIER_EQUAL;
 909                     src++;
 910                }
 911                else if(!strncmp(src, ">", 1)){
 912                     possibilities[i]->constraint = LATER_EQUAL;
 913                     src++;
 914                }
 915
 916                /* now we have any constraint, pass space to version string */
 917                while(isspace(*src)) src++;
 918
 919                /* this would be the version string */
 920                dest = buffer;
 921                while(*src && *src != ')')
 922                     *dest++ = *src++;
 923                *dest = '\0';
 924
 925                possibilities[i]->version = trim_alloc(buffer);
 926                /*                   fprintf(stderr, "let's print the depends version string:");
 927                                     fprintf(stderr, "version %s\n", possibilities[i]->version);*/
 928                if (possibilities[i]->version == NULL )
 929                     return -ENOMEM;
 930
 931
 932           }
 933           /* hook up the dependency to its abstract pkg */
 934           possibilities[i]->pkg = ensure_abstract_pkg_by_name(hash, pkg_name);
 935
 936           free(pkg_name);
 937
 938           /* now get past the ) and any possible | chars */
 939           while(*src &&
 940                 (isspace(*src) ||
 941                  (*src == ')') ||
 942                  (*src == '|')))
 943                src++;
 944           if (*src == '*')
 945           {
 946                compound_depend->type = GREEDY_DEPEND;
 947                src++;
 948           }
 949      }
 950
 951      return 0;
 952 }