libopkg/pkg_depends.c

   1 /* pkg_depends.c - the itsy 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 "opkg.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
  29 static int parseDepends(compound_depend_t *compound_depend, hash_table_t * hash, char * depend_str);
  30 static depend_t * depend_init(void);
  31 static void depend_deinit(depend_t *d);
  32 static char ** add_unresolved_dep(pkg_t * pkg, char ** the_lost, int ref_ndx);
  33 static char ** merge_unresolved(char ** oldstuff, char ** newstuff);
  34 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg);
  35
  36 static int pkg_installed_and_constraint_satisfied(pkg_t *pkg, void *cdata)
  37 {
  38      depend_t *depend = (depend_t *)cdata;
  39      if ((pkg->state_status == SS_INSTALLED || pkg->state_status == SS_UNPACKED) && version_constraints_satisfied(depend, pkg))
  40           return 1;
  41      else
  42           return 0;
  43 }
  44
  45 static int pkg_constraint_satisfied(pkg_t *pkg, void *cdata)
  46 {
  47      depend_t *depend = (depend_t *)cdata;
  48 #if 0
  49      pkg_t * temp = pkg_new();
  50      int comparison;
  51      parseVersion(temp, depend->version);
  52      comparison = pkg_compare_versions(pkg, temp);
  53      free(temp);
  54
  55      fprintf(stderr, "%s: pkg=%s pkg->version=%s constraint=%p type=%d version=%s comparison=%d satisfied=%d\n",
  56              __FUNCTION__, pkg->name, pkg->version,
  57              depend, depend->constraint, depend->version,
  58              comparison, version_constraints_satisfied(depend, pkg));
  59 #endif
  60      if (version_constraints_satisfied(depend, pkg))
  61           return 1;
  62      else
  63           return 0;
  64 }
  65
  66 /* returns ndependences or negative error value */
  67 int pkg_hash_fetch_unsatisfied_dependencies(opkg_conf_t *conf, pkg_t * pkg,
  68                                             pkg_vec_t *unsatisfied, char *** unresolved)
  69 {
  70      pkg_t * satisfier_entry_pkg;
  71      register int i, j, k;
  72      int count, found;
  73      char ** the_lost;
  74      abstract_pkg_t * ab_pkg;
  75
  76      /*
  77       * this is a setup to check for redundant/cyclic dependency checks,
  78       * which are marked at the abstract_pkg level
  79       */
  80      if (!(ab_pkg = pkg->parent)) {
  81           fprintf(stderr, "%s:%d: something terribly wrong with pkg %s\n", __FUNCTION__, __LINE__, pkg->name);
  82           *unresolved = NULL;
  83           return 0;
  84      }
  85      if (ab_pkg->dependencies_checked) {    /* avoid duplicate or cyclic checks */
  86           *unresolved = NULL;
  87           return 0;
  88      } else {
  89           ab_pkg->dependencies_checked = 1;  /* mark it for subsequent visits */
  90      }
  91      /**/
  92
  93      count = pkg->pre_depends_count + pkg->depends_count + pkg->recommends_count + pkg->suggests_count;
  94      if (!count){
  95           *unresolved = NULL;
  96           return 0;
  97      }
  98
  99      the_lost = NULL;
 100
 101      /* foreach dependency */
 102      for (i = 0; i < count; i++) {
 103           compound_depend_t * compound_depend = &pkg->depends[i];
 104           depend_t ** possible_satisfiers = compound_depend->possibilities;;
 105           found = 0;
 106           satisfier_entry_pkg = NULL;
 107
 108           if (compound_depend->type == GREEDY_DEPEND) {
 109                /* foreach possible satisfier */
 110                for (j = 0; j < compound_depend->possibility_count; j++) {
 111                     /* foreach provided_by, which includes the abstract_pkg itself */
 112                     abstract_pkg_t *abpkg = possible_satisfiers[j]->pkg;
 113                     abstract_pkg_vec_t *ab_provider_vec = abpkg->provided_by;
 114                     int nposs = ab_provider_vec->len;
 115                     abstract_pkg_t **ab_providers = ab_provider_vec->pkgs;
 116                     int l;
 117                     for (l = 0; l < nposs; l++) {
 118                          pkg_vec_t *test_vec = ab_providers[l]->pkgs;
 119                          /* if no depends on this one, try the first package that Provides this one */
 120                          if (!test_vec){   /* no pkg_vec hooked up to the abstract_pkg!  (need another feed?) */
 121                               continue;
 122                          }
 123
 124                          /* cruise this possiblity's pkg_vec looking for an installed version */
 125                          for (k = 0; k < test_vec->len; k++) {
 126                               pkg_t *pkg_scout = test_vec->pkgs[k];
 127                               /* not installed, and not already known about? */
 128                               if ((pkg_scout->state_want != SW_INSTALL)
 129                                   && !pkg_scout->parent->dependencies_checked
 130                                   && !is_pkg_in_pkg_vec(unsatisfied, pkg_scout)) {
 131                                    char ** newstuff = NULL;
 132                                    int rc;
 133                                    pkg_vec_t *tmp_vec = pkg_vec_alloc ();
 134                                    /* check for not-already-installed dependencies */
 135                                    rc = pkg_hash_fetch_unsatisfied_dependencies(conf,
 136                                                                                 pkg_scout,
 137                                                                                 tmp_vec,
 138                                                                                 &newstuff);
 139                                    if (newstuff == NULL) {
 140                                         int i;
 141                                         int ok = 1;
 142                                         for (i = 0; i < rc; i++) {
 143                                             pkg_t *p = tmp_vec->pkgs[i];
 144                                             if (p->state_want == SW_INSTALL)
 145                                                 continue;
 146                                             opkg_message(conf, OPKG_DEBUG, "not installing %s due to requirement for %s\n", pkg_scout->name, p->name);
 147                                             ok = 0;
 148                                             break;
 149                                         }
 150                                         pkg_vec_free (tmp_vec);
 151                                         if (ok) {
 152                                             /* mark this one for installation */
 153                                             opkg_message(conf, OPKG_NOTICE, "Adding satisfier for greedy dependence: %s\n", pkg_scout->name);
 154                                             pkg_vec_insert(unsatisfied, pkg_scout);
 155                                         }
 156                                    } else  {
 157                                         opkg_message(conf, OPKG_DEBUG, "not installing %s due to broken depends \n", pkg_scout->name);
 158                                         free (newstuff);
 159                                    }
 160                               }
 161                          }
 162                     }
 163                }
 164
 165                continue;
 166           }
 167
 168           /* foreach possible satisfier, look for installed package  */
 169           for (j = 0; j < compound_depend->possibility_count; j++) {
 170                /* foreach provided_by, which includes the abstract_pkg itself */
 171                depend_t *dependence_to_satisfy = possible_satisfiers[j];
 172                abstract_pkg_t *satisfying_apkg = possible_satisfiers[j]->pkg;
 173                pkg_t *satisfying_pkg =
 174                     pkg_hash_fetch_best_installation_candidate(conf, satisfying_apkg,
 175                                                                pkg_installed_and_constraint_satisfied,
 176                                                                dependence_to_satisfy, 1);
 177                /* Being that I can't test constraing in pkg_hash, I will test it here */
 178                if (satisfying_pkg != NULL) {
 179                   if (!pkg_installed_and_constraint_satisfied ( satisfying_pkg,dependence_to_satisfy)) {
 180                       satisfying_pkg = NULL;
 181                   }
 182                }
 183                opkg_message(conf, OPKG_DEBUG, "%s:%d: satisfying_pkg=%p \n", __FILE__, __LINE__, satisfying_pkg);
 184                if (satisfying_pkg != NULL) {
 185                     found = 1;
 186                     break;
 187                }
 188
 189           }
 190           /* if nothing installed matches, then look for uninstalled satisfier */
 191           if (!found) {
 192                /* foreach possible satisfier, look for installed package  */
 193                for (j = 0; j < compound_depend->possibility_count; j++) {
 194                     /* foreach provided_by, which includes the abstract_pkg itself */
 195                     depend_t *dependence_to_satisfy = possible_satisfiers[j];
 196                     abstract_pkg_t *satisfying_apkg = possible_satisfiers[j]->pkg;
 197                     pkg_t *satisfying_pkg =
 198                          pkg_hash_fetch_best_installation_candidate(conf, satisfying_apkg,
 199                                                                     pkg_constraint_satisfied,
 200                                                                     dependence_to_satisfy, 1);
 201                     /* Being that I can't test constraing in pkg_hash, I will test it here too */
 202                     if (satisfying_pkg != NULL) {
 203                          if (!pkg_constraint_satisfied ( satisfying_pkg,dependence_to_satisfy)) {
 204                             satisfying_pkg = NULL;
 205                          }
 206                     }
 207
 208                     /* user request overrides package recommendation */
 209                     if (satisfying_pkg != NULL
 210                         && (compound_depend->type == RECOMMEND || compound_depend->type == SUGGEST)
 211                         && (satisfying_pkg->state_want == SW_DEINSTALL || satisfying_pkg->state_want == SW_PURGE)) {
 212                          opkg_message (conf, OPKG_NOTICE, "%s: ignoring recommendation for %s at user request\n",
 213                                        pkg->name, satisfying_pkg->name);
 214                          continue;
 215                     }
 216
 217                     opkg_message(conf, OPKG_DEBUG, "%s:%d: satisfying_pkg=%p\n", __FILE__, __LINE__, satisfying_pkg);
 218                     if (satisfying_pkg != NULL) {
 219                          satisfier_entry_pkg = satisfying_pkg;
 220                          break;
 221                     }
 222                }
 223           }
 224
 225           /* we didn't find one, add something to the unsatisfied vector */
 226           if (!found) {
 227                if (!satisfier_entry_pkg) {
 228                     /* failure to meet recommendations is not an error */
 229                     if (compound_depend->type != RECOMMEND && compound_depend->type != SUGGEST)
 230                          the_lost = add_unresolved_dep(pkg, the_lost, i);
 231                     else
 232                          opkg_message (conf, OPKG_NOTICE, "%s: unsatisfied recommendation for %s\n",
 233                                        pkg->name, compound_depend->possibilities[0]->pkg->name);
 234                }
 235                else {
 236                     if (compound_depend->type == SUGGEST) {
 237                          /* just mention it politely */
 238                          opkg_message (conf, OPKG_NOTICE, "package %s suggests installing %s\n",
 239                                        pkg->name, satisfier_entry_pkg->name);
 240                     } else {
 241                          char ** newstuff = NULL;
 242
 243                          if (satisfier_entry_pkg != pkg &&
 244                              !is_pkg_in_pkg_vec(unsatisfied, satisfier_entry_pkg)) {
 245                               pkg_vec_insert(unsatisfied, satisfier_entry_pkg);
 246                               pkg_hash_fetch_unsatisfied_dependencies(conf,
 247                                                                       satisfier_entry_pkg,
 248                                                                       unsatisfied,
 249                                                                       &newstuff);
 250                               the_lost = merge_unresolved(the_lost, newstuff);
 251                          }
 252                     }
 253                }
 254           }
 255      }
 256      *unresolved = the_lost;
 257
 258      return unsatisfied->len;
 259 }
 260
 261 /*checking for conflicts !in replaces
 262   If a packages conflicts with another but is also replacing it, I should not consider it a
 263   really conflicts
 264   returns 0 if conflicts <> replaces or 1 if conflicts == replaces
 265 */
 266 int is_pkg_a_replaces(pkg_t *pkg_scout,pkg_t *pkg)
 267 {
 268     int i ;
 269     int replaces_count = pkg->replaces_count;
 270     abstract_pkg_t **replaces;
 271
 272     if (pkg->replaces_count==0)    // No replaces, it's surely a conflict
 273         return 0;
 274
 275     replaces = pkg->replaces;
 276
 277     for (i = 0; i < replaces_count; i++) {
 278         if (strcmp(pkg_scout->name,pkg->replaces[i]->name)==0) {      // Found
 279             opkg_message(NULL, OPKG_DEBUG2, "Seems I've found a replace %s %s \n",pkg_scout->name,pkg->replaces[i]->name);
 280             return 1;
 281         }
 282     }
 283     return 0;
 284
 285 }
 286
 287
 288 /* Abhaya: added support for conflicts */
 289 pkg_vec_t * pkg_hash_fetch_conflicts(hash_table_t * hash, pkg_t * pkg)
 290 {
 291     pkg_vec_t * installed_conflicts, * test_vec;
 292     compound_depend_t * conflicts;
 293     depend_t ** possible_satisfiers;
 294     depend_t * possible_satisfier;
 295     register int i, j, k;
 296     int count;
 297     abstract_pkg_t * ab_pkg;
 298     pkg_t **pkg_scouts;
 299     pkg_t *pkg_scout;
 300
 301     /*
 302      * this is a setup to check for redundant/cyclic dependency checks,
 303      * which are marked at the abstract_pkg level
 304      */
 305     if(!(ab_pkg = pkg->parent)){
 306         fprintf(stderr, "dependency check error.  pkg %s isn't in hash table\n", pkg->name);
 307         return (pkg_vec_t *)NULL;
 308     }
 309
 310     conflicts = pkg->conflicts;
 311     if(!conflicts){
 312         return (pkg_vec_t *)NULL;
 313     }
 314     installed_conflicts = pkg_vec_alloc();
 315
 316     count = pkg->conflicts_count;
 317
 318
 319
 320     /* foreach conflict */
 321     for(i = 0; i < pkg->conflicts_count; i++){
 322
 323         possible_satisfiers = conflicts->possibilities;
 324
 325         /* foreach possible satisfier */
 326         for(j = 0; j < conflicts->possibility_count; j++){
 327             possible_satisfier = possible_satisfiers[j];
 328             if (!possible_satisfier)
 329                 fprintf(stderr, "%s:%d: possible_satisfier is null\n", __FUNCTION__, __LINE__);
 330             if (!possible_satisfier->pkg)
 331                 fprintf(stderr, "%s:%d: possible_satisfier->pkg is null\n", __FUNCTION__, __LINE__);
 332             test_vec = possible_satisfier->pkg->pkgs;
 333             if (test_vec) {
 334                 /* pkg_vec found, it is an actual package conflict
 335                  * cruise this possiblity's pkg_vec looking for an installed version */
 336                 pkg_scouts = test_vec->pkgs;
 337                 for(k = 0; k < test_vec->len; k++){
 338                     pkg_scout = pkg_scouts[k];
 339                     if (!pkg_scout) {
 340                         fprintf(stderr,  "%s: null pkg scout\n", __FUNCTION__);
 341                         continue;
 342                     }
 343                     if ((pkg_scout->state_status == SS_INSTALLED || pkg_scout->state_want == SW_INSTALL) &&
 344                        version_constraints_satisfied(possible_satisfier, pkg_scout) && !is_pkg_a_replaces(pkg_scout,pkg)){
 345                         if (!is_pkg_in_pkg_vec(installed_conflicts, pkg_scout)){
 346                             pkg_vec_insert(installed_conflicts, pkg_scout);
 347                         }
 348                     }
 349                 }
 350             }
 351         }
 352         conflicts++;
 353     }
 354
 355     if (installed_conflicts->len)
 356             return installed_conflicts;
 357     pkg_vec_free(installed_conflicts);
 358         return (pkg_vec_t *)NULL;
 359 }
 360
 361 int version_constraints_satisfied(depend_t * depends, pkg_t * pkg)
 362 {
 363     pkg_t * temp;
 364     int comparison;
 365
 366     if(depends->constraint == NONE)
 367         return 1;
 368
 369     temp = pkg_new();
 370
 371     parseVersion(temp, depends->version);
 372
 373     comparison = pkg_compare_versions(pkg, temp);
 374
 375     free(temp);
 376
 377     if((depends->constraint == EARLIER) &&
 378        (comparison < 0))
 379         return 1;
 380     else if((depends->constraint == LATER) &&
 381             (comparison > 0))
 382         return 1;
 383     else if(comparison == 0)
 384         return 1;
 385     else if((depends->constraint == LATER_EQUAL) &&
 386             (comparison >= 0))
 387         return 1;
 388     else if((depends->constraint == EARLIER_EQUAL) &&
 389             (comparison <= 0))
 390         return 1;
 391
 392     return 0;
 393 }
 394
 395 int pkg_dependence_satisfiable(opkg_conf_t *conf, depend_t *depend)
 396 {
 397      abstract_pkg_t *apkg = depend->pkg;
 398      abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 399      int n_providers = provider_apkgs->len;
 400      abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 401      pkg_vec_t *pkg_vec;
 402      int n_pkgs ;
 403      int i;
 404      int j;
 405
 406      for (i = 0; i < n_providers; i++) {
 407           abstract_pkg_t *papkg = apkgs[i];
 408           pkg_vec = papkg->pkgs;
 409           if (pkg_vec) {
 410                n_pkgs = pkg_vec->len;
 411                for (j = 0; j < n_pkgs; j++) {
 412                     pkg_t *pkg = pkg_vec->pkgs[j];
 413                     if (version_constraints_satisfied(depend, pkg)) {
 414                          return 1;
 415                     }
 416                }
 417           }
 418      }
 419      return 0;
 420 }
 421
 422 int pkg_dependence_satisfied(opkg_conf_t *conf, depend_t *depend)
 423 {
 424      abstract_pkg_t *apkg = depend->pkg;
 425      abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 426      int n_providers = provider_apkgs->len;
 427      abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 428      int i;
 429      int n_pkgs;
 430      int j;
 431
 432      for (i = 0; i < n_providers; i++) {
 433           abstract_pkg_t *papkg = apkgs[i];
 434           pkg_vec_t *pkg_vec = papkg->pkgs;
 435           if (pkg_vec) {
 436                n_pkgs = pkg_vec->len;
 437                for (j = 0; j < n_pkgs; j++) {
 438                     pkg_t *pkg = pkg_vec->pkgs[j];
 439                     if (version_constraints_satisfied(depend, pkg)) {
 440                          if (pkg->state_status == SS_INSTALLED || pkg->state_status == SS_UNPACKED)
 441                               return 1;
 442                     }
 443                }
 444           }
 445      }
 446      return 0;
 447 }
 448
 449 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg)
 450 {
 451     register int i;
 452     pkg_t ** pkgs = vec->pkgs;
 453
 454     for(i = 0; i < vec->len; i++)
 455         if((strcmp(pkg->name, (*(pkgs + i))->name) == 0)
 456            && (pkg_compare_versions(pkg, *(pkgs + i)) == 0)
 457            && (strcmp(pkg->architecture, (*(pkgs + i))->architecture) == 0))
 458             return 1;
 459     return 0;
 460 }
 461
 462
 463 #ifdef DeadCode
 464 /**
 465  * pkg_has_common_provides returns 1 if pkg and replacee both provide
 466  * the same abstract package and 0 otherwise.
 467  */
 468 int pkg_has_common_provides(pkg_t *pkg, pkg_t *replacee)
 469 {
 470      abstract_pkg_t **provides = pkg->provides;
 471      int provides_count = pkg->provides_count;
 472      abstract_pkg_t **replacee_provides = replacee->provides;
 473      int replacee_provides_count = replacee->provides_count;
 474      int i, j;
 475      for (i = 0; i < provides_count; i++) {
 476           abstract_pkg_t *apkg = provides[i];
 477           for (j = 0; j < replacee_provides_count; j++) {
 478                abstract_pkg_t *replacee_apkg = replacee_provides[i];
 479                if (apkg == replacee_apkg)
 480                     return 1;
 481           }
 482      }
 483      return 0;
 484 }
 485 #endif
 486
 487 /**
 488  * pkg_provides_abstract returns 1 if pkg->provides contains providee
 489  * and 0 otherwise.
 490  */
 491 int pkg_provides_abstract(pkg_t *pkg, abstract_pkg_t *providee)
 492 {
 493      abstract_pkg_t **provides = pkg->provides;
 494      int provides_count = pkg->provides_count;
 495      int i;
 496      for (i = 0; i < provides_count; i++) {
 497           if (provides[i] == providee)
 498                return 1;
 499      }
 500      return 0;
 501 }
 502
 503 /**
 504  * pkg_replaces returns 1 if pkg->replaces contains one of replacee's provides and 0
 505  * otherwise.
 506  */
 507 int pkg_replaces(pkg_t *pkg, pkg_t *replacee)
 508 {
 509      abstract_pkg_t **replaces = pkg->replaces;
 510      int replaces_count = pkg->replaces_count;
 511      /* abstract_pkg_t **replacee_provides = pkg->provides;
 512      int replacee_provides_count = pkg->provides_count; */
 513      int i, j;
 514      for (i = 0; i < replaces_count; i++) {
 515           abstract_pkg_t *abstract_replacee = replaces[i];
 516           for (j = 0; j < replaces_count; j++) {
 517    /*            opkg_message(NULL, OPKG_DEBUG2, "Searching pkg-name %s repprovname %s absrepname %s \n",
 518                  pkg->name,replacee->provides[j]->name, abstract_replacee->name); */
 519                if (replacee->provides[j] == abstract_replacee)
 520                     return 1;
 521           }
 522      }
 523      return 0;
 524 }
 525
 526
 527 /**
 528  * pkg_conflicts_abstract returns 1 if pkg->conflicts contains conflictee and 0
 529  * otherwise.
 530  */
 531 int pkg_conflicts_abstract(pkg_t *pkg, abstract_pkg_t *conflictee)
 532 {
 533      compound_depend_t *conflicts = pkg->conflicts;
 534      int conflicts_count = pkg->conflicts_count;
 535      int i, j;
 536      for (i = 0; i < conflicts_count; i++) {
 537           int possibility_count = conflicts[i].possibility_count;
 538           struct depend **possibilities = conflicts[i].possibilities;
 539           for (j = 0; j < possibility_count; j++) {
 540                if (possibilities[j]->pkg == conflictee) {
 541                     return 1;
 542                }
 543           }
 544      }
 545      return 0;
 546 }
 547
 548 /**
 549  * pkg_conflicts returns 1 if pkg->conflicts contains one of
 550  * conflictee's provides and 0 otherwise.
 551  */
 552 int pkg_conflicts(pkg_t *pkg, pkg_t *conflictee)
 553 {
 554      compound_depend_t *conflicts = pkg->conflicts;
 555      int conflicts_count = pkg->conflicts_count;
 556      abstract_pkg_t **conflictee_provides = conflictee->provides;
 557      int conflictee_provides_count = conflictee->provides_count;
 558      int i, j, k;
 559      int possibility_count;
 560      struct depend **possibilities;
 561      abstract_pkg_t *possibility ;
 562
 563      for (i = 0; i < conflicts_count; i++) {
 564           possibility_count = conflicts[i].possibility_count;
 565           possibilities = conflicts[i].possibilities;
 566           for (j = 0; j < possibility_count; j++) {
 567                possibility = possibilities[j]->pkg;
 568                for (k = 0; k < conflictee_provides_count; k++) {
 569                     if (possibility == conflictee_provides[k]) {
 570                          return 1;
 571                     }
 572                }
 573           }
 574      }
 575      return 0;
 576 }
 577
 578 static char ** merge_unresolved(char ** oldstuff, char ** newstuff)
 579 {
 580     int oldlen = 0, newlen = 0;
 581     char ** result;
 582     register int i, j;
 583
 584     if(!newstuff)
 585         return oldstuff;
 586
 587     while(oldstuff && oldstuff[oldlen]) oldlen++;
 588     while(newstuff && newstuff[newlen]) newlen++;
 589
 590     result = (char **)realloc(oldstuff, sizeof(char *) * (oldlen + newlen + 1));
 591     if (result == NULL) {
 592         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 593         return NULL;
 594     }
 595
 596     for(i = oldlen, j = 0; i < (oldlen + newlen); i++, j++)
 597         *(result + i) = *(newstuff + j);
 598
 599     *(result + i) = NULL;
 600
 601     return result;
 602 }
 603
 604 /*
 605  * a kinda kludgy way to back out depends str from two different arrays (reg'l'r 'n pre)
 606  * this is null terminated, no count is carried around
 607  */
 608 char ** add_unresolved_dep(pkg_t * pkg, char ** the_lost, int ref_ndx)
 609 {
 610     int count;
 611     char ** resized;
 612     char *depend_str = pkg_depend_str(pkg, ref_ndx);
 613
 614     count = 0;
 615     while(the_lost && the_lost[count]) count++;
 616
 617     count++;  /* need one to hold the null */
 618     resized = (char **)realloc(the_lost, sizeof(char *) * (count + 1));
 619     if (resized == NULL) {
 620        fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 621        return NULL;
 622     }
 623     resized[count - 1] = strdup(depend_str);
 624     resized[count] = NULL;
 625
 626     return resized;
 627 }
 628
 629 void printDepends(pkg_t * pkg)
 630 {
 631     register int i, j;
 632     compound_depend_t * depend;
 633     int count;
 634
 635     count = pkg->pre_depends_count + pkg->depends_count;
 636
 637     depend = pkg->depends;
 638     if(!depend){
 639         fprintf(stderr, "Depends pointer is NULL\n");
 640         return;
 641     }
 642     for(i = 0; i < count; i++){
 643         fprintf(stderr, "%s has %d possibilities:\n",
 644                 (depend->type == GREEDY_DEPEND) ? "Greedy-Depend" : ((depend->type == DEPEND) ? "Depend" : "Pre-Depend"),
 645                 depend->possibility_count);
 646         for(j = 0; j < depend->possibility_count; j++)
 647             fprintf(stderr, "\t%s version %s (%d)\n",
 648                     depend->possibilities[j]->pkg->name,
 649                     depend->possibilities[j]->version,
 650                     depend->possibilities[j]->constraint);
 651         depend++;
 652     }
 653 }
 654
 655 int buildProvides(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 656 {
 657     register int i, j;
 658
 659     /* every pkg provides itself */
 660     abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 661
 662     if (!pkg->provides_count)
 663       return 0;
 664
 665     pkg->provides = (abstract_pkg_t **)malloc(sizeof(abstract_pkg_t *) * (pkg->provides_count + 1));
 666     if (pkg->provides == NULL) {
 667        fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 668        return -1 ;
 669     }
 670     pkg->provides[0] = ab_pkg;
 671
 672     // if (strcmp(ab_pkg->name, pkg->name))
 673     //     fprintf(stderr, __FUNCTION__ ": ab_pkg=%s pkg=%s\n", ab_pkg->name, pkg->name);
 674
 675     for(i = 0; i < pkg->provides_count; i++){
 676          abstract_pkg_t *provided_abpkg = ensure_abstract_pkg_by_name(hash, pkg->provides_str[i]);
 677
 678         pkg->provides[i+1] = provided_abpkg;
 679
 680         j = 0;
 681         abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 682     }
 683     return 0;
 684 }
 685
 686 /* Abhaya: added conflicts support */
 687 int buildConflicts(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 688 {
 689     register int i;
 690     compound_depend_t * conflicts;
 691
 692     if (!pkg->conflicts_count)
 693         return 0;
 694
 695     conflicts = pkg->conflicts = malloc(sizeof(compound_depend_t) *
 696                                         pkg->conflicts_count);
 697     if (conflicts == NULL) {
 698        fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 699        return  -1;
 700     }
 701     for (i = 0; i < pkg->conflicts_count; i++) {
 702          conflicts->type = CONFLICTS;
 703          parseDepends(conflicts, hash,
 704                       pkg->conflicts_str[i]);
 705 #if 0
 706          for (j = 0; j < conflicts->possibility_count; j++) {
 707               depend_t *possibility = conflicts->possibilities[j];
 708               abstract_pkg_t *conflicting_apkg = possibility->pkg;
 709               pkg_add_conflict_pair(ab_pkg, conflicting_apkg);
 710          }
 711 #endif
 712          conflicts++;
 713     }
 714     return 0;
 715 }
 716
 717 int buildReplaces(hash_table_t * hash, abstract_pkg_t * ab_pkg, pkg_t * pkg)
 718 {
 719      register int i, j;
 720
 721      if (!pkg->replaces_count)
 722           return 0;
 723
 724      pkg->replaces = (abstract_pkg_t **)malloc(sizeof(abstract_pkg_t *) * pkg->replaces_count);
 725      if (pkg->replaces == NULL) {
 726         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 727         return  -1;
 728      }
 729
 730      // if (strcmp(ab_pkg->name, pkg->name))
 731      //     fprintf(stderr, __FUNCTION__ ": ab_pkg=%s pkg=%s\n", ab_pkg->name, pkg->name);
 732
 733      for(i = 0; i < pkg->replaces_count; i++){
 734           abstract_pkg_t *old_abpkg = ensure_abstract_pkg_by_name(hash, pkg->replaces_str[i]);
 735
 736           pkg->replaces[i] = old_abpkg;
 737
 738           j = 0;
 739           if (!old_abpkg->replaced_by)
 740                old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 741                if ( old_abpkg->replaced_by == NULL ){
 742                   return -1;
 743                }
 744           /* if a package pkg both replaces and conflicts old_abpkg,
 745            * then add it to the replaced_by vector so that old_abpkg
 746            * will be upgraded to ab_pkg automatically */
 747           if (pkg_conflicts_abstract(pkg, old_abpkg))
 748                abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 749      }
 750      return 0;
 751 }
 752
 753 int buildDepends(hash_table_t * hash, pkg_t * pkg)
 754 {
 755      int count;
 756      register int i;
 757      compound_depend_t * depends;
 758
 759      if(!(count = pkg->pre_depends_count + pkg->depends_count + pkg->recommends_count + pkg->suggests_count))
 760           return 0;
 761
 762      if (0 && pkg->pre_depends_count)
 763           fprintf(stderr, "pkg=%s pre_depends_count=%d depends_count=%d\n",
 764                   pkg->name, pkg->pre_depends_count, pkg->depends_count);
 765      depends = pkg->depends = malloc(sizeof(compound_depend_t) * count);
 766      if (depends == NULL) {
 767         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 768         return  -1;
 769      }
 770
 771
 772      for(i = 0; i < pkg->pre_depends_count; i++){
 773           parseDepends(depends, hash, pkg->pre_depends_str[i]);
 774           if (0 && pkg->pre_depends_count)
 775                fprintf(stderr, " pre_depends_str=%s depends=%p possibility_count=%x\n",
 776                        pkg->pre_depends_str[i], depends, depends->possibility_count);
 777           depends->type = PREDEPEND;
 778           depends++;
 779      }
 780
 781      for(i = 0; i < pkg->recommends_count; i++){
 782           parseDepends(depends, hash, pkg->recommends_str[i]);
 783           if (0 && pkg->recommends_count)
 784                fprintf(stderr, " recommends_str=%s depends=%p possibility_count=%x\n",
 785                        pkg->recommends_str[i], depends, depends->possibility_count);
 786           depends->type = RECOMMEND;
 787           depends++;
 788      }
 789
 790      for(i = 0; i < pkg->suggests_count; i++){
 791           parseDepends(depends, hash, pkg->suggests_str[i]);
 792           if (0 && pkg->suggests_count)
 793                fprintf(stderr, " suggests_str=%s depends=%p possibility_count=%x\n",
 794                        pkg->suggests_str[i], depends, depends->possibility_count);
 795           depends->type = SUGGEST;
 796           depends++;
 797      }
 798
 799      for(i = 0; i < pkg->depends_count; i++){
 800           parseDepends(depends, hash, pkg->depends_str[i]);
 801           if (0 && pkg->depends_count)
 802                fprintf(stderr, " depends_str=%s depends=%p possibility_count=%x\n",
 803                        pkg->depends_str[i], depends, depends->possibility_count);
 804           depends++;
 805      }
 806      return 0;
 807 }
 808
 809 /*
 810  * pkg_depend_string: returns the depends string specified by index.
 811  *   All 4 kinds of dependences: dependence, pre-dependence, recommend, and suggest are number starting from 0.
 812  *   [0,npredepends) -> returns pre_depends_str[index]
 813  *   [npredepends,npredepends+nrecommends) -> returns recommends_str[index]
 814  *   [npredepends+nrecommends,npredepends+nrecommends+nsuggests) -> returns recommends_str[index]
 815  *   [npredepends+nrecommends+nsuggests,npredepends+nrecommends+nsuggests+ndepends) -> returns depends_str[index]
 816  */
 817 char *pkg_depend_str(pkg_t *pkg, int index)
 818 {
 819      if (index < pkg->pre_depends_count) {
 820           return pkg->pre_depends_str[index];
 821      }
 822      index -= pkg->pre_depends_count;
 823
 824      if (index < pkg->recommends_count) {
 825           return pkg->recommends_str[index];
 826      }
 827      index -= pkg->recommends_count;
 828
 829      if (index < pkg->suggests_count) {
 830           return pkg->suggests_str[index];
 831      }
 832      index -= pkg->suggests_count;
 833
 834      if (index < pkg->depends_count) {
 835           return pkg->depends_str[index];
 836      }
 837      fprintf(stderr, "pkg_depend_str: index %d out of range for pkg=%s\n", index, pkg->name);
 838      return NULL;
 839 }
 840
 841 void freeDepends(pkg_t *pkg)
 842 {
 843     int i;
 844
 845     if (pkg == NULL || pkg->depends == NULL) {
 846         return;
 847     }
 848
 849     fprintf(stderr, "Freeing depends=%p\n", pkg->depends);
 850     for (i=0; i < pkg->depends->possibility_count; i++) {
 851         depend_deinit(pkg->depends->possibilities[i]);
 852     }
 853     free(pkg->depends->possibilities);
 854     free(pkg->depends);
 855     pkg->depends = NULL;
 856 }
 857
 858 void buildDependedUponBy(pkg_t * pkg, abstract_pkg_t * ab_pkg)
 859 {
 860      compound_depend_t * depends;
 861      int count, othercount;
 862      register int i, j;
 863      abstract_pkg_t * ab_depend;
 864      abstract_pkg_t ** temp;
 865
 866      count = pkg->pre_depends_count + pkg->depends_count;
 867      depends = pkg->depends;
 868
 869           if (0 && pkg->pre_depends_count)
 870                fprintf(stderr, "pkg=%s pre_depends_count=%d depends_count=%d\n",
 871                        pkg->name, pkg->pre_depends_count, pkg->depends_count);
 872      for (i = 0; i < count; i++) {
 873           if (0 && pkg->pre_depends_count)
 874                fprintf(stderr, "  i=%d possibility_count=%x depends=%p\n", i, depends->possibility_count, depends);
 875           for (j = 0; j < depends->possibility_count; j++){
 876                ab_depend = depends->possibilities[j]->pkg;
 877                if(!ab_depend->depended_upon_by)
 878                     ab_depend->depended_upon_by = (abstract_pkg_t **)calloc(1, sizeof(abstract_pkg_t *));
 879
 880                temp = ab_depend->depended_upon_by;
 881                othercount = 1;
 882                while(*temp){
 883                     temp++;
 884                     othercount++;
 885                }
 886                *temp = ab_pkg;
 887
 888                ab_depend->depended_upon_by = (abstract_pkg_t **)realloc(ab_depend->depended_upon_by,
 889                                                                         (othercount + 1) * sizeof(abstract_pkg_t *));
 890                /* the array may have moved */
 891                temp = ab_depend->depended_upon_by + othercount;
 892                *temp = NULL;
 893           }
 894           depends++;
 895      }
 896 }
 897
 898 static depend_t * depend_init(void)
 899 {
 900     depend_t * d = (depend_t *)malloc(sizeof(depend_t));
 901     if ( d==NULL ){
 902         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 903         return NULL;
 904      }
 905     d->constraint = NONE;
 906     d->version = NULL;
 907     d->pkg = NULL;
 908
 909     return d;
 910 }
 911
 912 static void depend_deinit(depend_t *d)
 913 {
 914     free(d);
 915 }
 916
 917 static int parseDepends(compound_depend_t *compound_depend,
 918                         hash_table_t * hash, char * depend_str)
 919 {
 920      char * pkg_name, buffer[2048];
 921      int num_of_ors = 0;
 922      register int i;
 923      register char * src, * dest;
 924      depend_t ** possibilities;
 925
 926      /* first count the number of ored possibilities for satisfying dependency */
 927      src = depend_str;
 928      while(*src)
 929           if(*src++ == '|')
 930                num_of_ors++;
 931
 932      compound_depend->type = DEPEND;
 933
 934      compound_depend->possibility_count = num_of_ors + 1;
 935      possibilities = (depend_t **)malloc(sizeof(depend_t *) * (num_of_ors + 1));
 936      if (!possibilities)
 937           return -ENOMEM;
 938      compound_depend->possibilities = possibilities;
 939
 940      src = depend_str;
 941      for(i = 0; i < num_of_ors + 1; i++){
 942           possibilities[i] = depend_init();
 943           if (!possibilities[i])
 944                return -ENOMEM;
 945           /* gobble up just the name first */
 946           dest = buffer;
 947           while(*src &&
 948                 !isspace(*src) &&
 949                 (*src != '(') &&
 950                 (*src != '*') &&
 951                 (*src != '|'))
 952                *dest++ = *src++;
 953           *dest = '\0';
 954           pkg_name = trim_alloc(buffer);
 955           if (pkg_name == NULL )
 956                return -ENOMEM;
 957
 958           /* now look at possible version info */
 959
 960           /* skip to next chars */
 961           if(isspace(*src))
 962                while(*src && isspace(*src)) src++;
 963
 964           /* extract constraint and version */
 965           if(*src == '('){
 966                src++;
 967                if(!strncmp(src, "<<", 2)){
 968                     possibilities[i]->constraint = EARLIER;
 969                     src += 2;
 970                }
 971                else if(!strncmp(src, "<=", 2)){
 972                     possibilities[i]->constraint = EARLIER_EQUAL;
 973                     src += 2;
 974                }
 975                else if(!strncmp(src, ">=", 2)){
 976                     possibilities[i]->constraint = LATER_EQUAL;
 977                     src += 2;
 978                }
 979                else if(!strncmp(src, ">>", 2)){
 980                     possibilities[i]->constraint = LATER;
 981                     src += 2;
 982                }
 983                else if(!strncmp(src, "=", 1)){
 984                     possibilities[i]->constraint = EQUAL;
 985                     src++;
 986                }
 987                /* should these be here to support deprecated designations; dpkg does */
 988                else if(!strncmp(src, "<", 1)){
 989                     possibilities[i]->constraint = EARLIER_EQUAL;
 990                     src++;
 991                }
 992                else if(!strncmp(src, ">", 1)){
 993                     possibilities[i]->constraint = LATER_EQUAL;
 994                     src++;
 995                }
 996
 997                /* now we have any constraint, pass space to version string */
 998                while(isspace(*src)) src++;
 999
1000                /* this would be the version string */
1001                dest = buffer;
1002                while(*src && *src != ')')
1003                     *dest++ = *src++;
1004                *dest = '\0';
1005
1006                possibilities[i]->version = trim_alloc(buffer);
1007                /*                   fprintf(stderr, "let's print the depends version string:");
1008                                     fprintf(stderr, "version %s\n", possibilities[i]->version);*/
1009                if (possibilities[i]->version == NULL )
1010                     return -ENOMEM;
1011
1012
1013           }
1014           /* hook up the dependency to its abstract pkg */
1015           possibilities[i]->pkg = ensure_abstract_pkg_by_name(hash, pkg_name);
1016
1017           free(pkg_name);
1018
1019           /* now get past the ) and any possible | chars */
1020           while(*src &&
1021                 (isspace(*src) ||
1022                  (*src == ')') ||
1023                  (*src == '|')))
1024                src++;
1025           if (*src == '*')
1026           {
1027                compound_depend->type = GREEDY_DEPEND;
1028                src++;
1029           }
1030      }
1031
1032      return 0;
1033 }