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 count, found;
  63         char **the_lost;
  64         abstract_pkg_t *ab_pkg;
  65
  66         /*
  67          * this is a setup to check for redundant/cyclic dependency checks,
  68          * which are marked at the abstract_pkg level
  69          */
  70         if (!(ab_pkg = pkg->parent)) {
  71                 opkg_msg(ERROR, "Internal error, with pkg %s.\n", pkg->name);
  72                 *unresolved = NULL;
  73                 return 0;
  74         }
  75         if (ab_pkg->dependencies_checked) {     /* avoid duplicate or cyclic checks */
  76                 *unresolved = NULL;
  77                 return 0;
  78         } else {
  79                 ab_pkg->dependencies_checked = 1;       /* mark it for subsequent visits */
  80         }
  81          /**/
  82             count =
  83             pkg->pre_depends_count + pkg->depends_count +
  84             pkg->recommends_count + pkg->suggests_count;
  85         if (!count) {
  86                 *unresolved = NULL;
  87                 return 0;
  88         }
  89
  90         the_lost = NULL;
  91
  92         /* foreach dependency */
  93         for (i = 0; i < count; i++) {
  94                 compound_depend_t *compound_depend = &pkg->depends[i];
  95                 depend_t **possible_satisfiers =
  96                     compound_depend->possibilities;;
  97                 found = 0;
  98                 satisfier_entry_pkg = NULL;
  99
 100                 if (compound_depend->type == GREEDY_DEPEND) {
 101                         /* foreach possible satisfier */
 102                         for (j = 0; j < compound_depend->possibility_count; j++) {
 103                                 /* foreach provided_by, which includes the abstract_pkg itself */
 104                                 abstract_pkg_t *abpkg =
 105                                     possible_satisfiers[j]->pkg;
 106                                 abstract_pkg_vec_t *ab_provider_vec =
 107                                     abpkg->provided_by;
 108                                 int nposs = ab_provider_vec->len;
 109                                 abstract_pkg_t **ab_providers =
 110                                     ab_provider_vec->pkgs;
 111                                 int l;
 112                                 for (l = 0; l < nposs; l++) {
 113                                         pkg_vec_t *test_vec =
 114                                             ab_providers[l]->pkgs;
 115                                         /* if no depends on this one, try the first package that Provides this one */
 116                                         if (!test_vec) {        /* no pkg_vec hooked up to the abstract_pkg!  (need another feed?) */
 117                                                 continue;
 118                                         }
 119
 120                                         /* cruise this possiblity's pkg_vec looking for an installed version */
 121                                         for (k = 0; k < test_vec->len; k++) {
 122                                                 pkg_t *pkg_scout =
 123                                                     test_vec->pkgs[k];
 124                                                 /* not installed, and not already known about? */
 125                                                 if ((pkg_scout->state_want !=
 126                                                      SW_INSTALL)
 127                                                     && !pkg_scout->parent->
 128                                                     dependencies_checked
 129                                                     &&
 130                                                     !is_pkg_in_pkg_vec
 131                                                     (unsatisfied, pkg_scout)) {
 132                                                         char **newstuff = NULL;
 133                                                         int rc;
 134                                                         pkg_vec_t *tmp_vec =
 135                                                             pkg_vec_alloc();
 136                                                         /* check for not-already-installed dependencies */
 137                                                         rc = pkg_hash_fetch_unsatisfied_dependencies(pkg_scout, tmp_vec, &newstuff);
 138                                                         if (newstuff == NULL) {
 139                                                                 int m;
 140                                                                 int ok = 1;
 141                                                                 for (m = 0;
 142                                                                      m < rc;
 143                                                                      m++) {
 144                                                                         pkg_t *p
 145                                                                             =
 146                                                                             tmp_vec->
 147                                                                             pkgs
 148                                                                             [m];
 149                                                                         if (p->
 150                                                                             state_want
 151                                                                             ==
 152                                                                             SW_INSTALL)
 153                                                                                 continue;
 154                                                                         opkg_msg
 155                                                                             (DEBUG,
 156                                                                              "Not installing %s due"
 157                                                                              " to requirement for %s.\n",
 158                                                                              pkg_scout->
 159                                                                              name,
 160                                                                              p->
 161                                                                              name);
 162                                                                         ok = 0;
 163                                                                         break;
 164                                                                 }
 165                                                                 pkg_vec_free
 166                                                                     (tmp_vec);
 167                                                                 if (ok) {
 168                                                                         /* mark this one for installation */
 169                                                                         opkg_msg
 170                                                                             (NOTICE,
 171                                                                              "Adding satisfier for greedy"
 172                                                                              " dependence %s.\n",
 173                                                                              pkg_scout->
 174                                                                              name);
 175                                                                         pkg_vec_insert
 176                                                                             (unsatisfied,
 177                                                                              pkg_scout);
 178                                                                 }
 179                                                         } else {
 180                                                                 opkg_msg(DEBUG,
 181                                                                          "Not installing %s due to "
 182                                                                          "broken depends.\n",
 183                                                                          pkg_scout->
 184                                                                          name);
 185                                                                 free(newstuff);
 186                                                         }
 187                                                 }
 188                                         }
 189                                 }
 190                         }
 191
 192                         continue;
 193                 }
 194
 195                 /* foreach possible satisfier, look for installed package  */
 196                 for (j = 0; j < compound_depend->possibility_count; j++) {
 197                         /* foreach provided_by, which includes the abstract_pkg itself */
 198                         depend_t *dependence_to_satisfy =
 199                             possible_satisfiers[j];
 200                         abstract_pkg_t *satisfying_apkg =
 201                             possible_satisfiers[j]->pkg;
 202                         pkg_t *satisfying_pkg =
 203                             pkg_hash_fetch_best_installation_candidate
 204                             (satisfying_apkg,
 205                              pkg_installed_and_constraint_satisfied,
 206                              dependence_to_satisfy, 1);
 207                         /* Being that I can't test constraing in pkg_hash, I will test it here */
 208                         if (satisfying_pkg != NULL) {
 209                                 if (!pkg_installed_and_constraint_satisfied
 210                                     (satisfying_pkg, dependence_to_satisfy)) {
 211                                         satisfying_pkg = NULL;
 212                                 }
 213                         }
 214                         opkg_msg(DEBUG, "satisfying_pkg=%p\n", satisfying_pkg);
 215                         if (satisfying_pkg != NULL) {
 216                                 found = 1;
 217                                 break;
 218                         }
 219
 220                 }
 221                 /* if nothing installed matches, then look for uninstalled satisfier */
 222                 if (!found) {
 223                         /* foreach possible satisfier, look for installed package  */
 224                         for (j = 0; j < compound_depend->possibility_count; j++) {
 225                                 /* foreach provided_by, which includes the abstract_pkg itself */
 226                                 depend_t *dependence_to_satisfy =
 227                                     possible_satisfiers[j];
 228                                 abstract_pkg_t *satisfying_apkg =
 229                                     possible_satisfiers[j]->pkg;
 230                                 pkg_t *satisfying_pkg =
 231                                     pkg_hash_fetch_best_installation_candidate
 232                                     (satisfying_apkg,
 233                                      pkg_constraint_satisfied,
 234                                      dependence_to_satisfy, 1);
 235                                 /* Being that I can't test constraing in pkg_hash, I will test it here too */
 236                                 if (satisfying_pkg != NULL) {
 237                                         if (!pkg_constraint_satisfied
 238                                             (satisfying_pkg,
 239                                              dependence_to_satisfy)) {
 240                                                 satisfying_pkg = NULL;
 241                                         }
 242                                 }
 243
 244                                 /* user request overrides package recommendation */
 245                                 if (satisfying_pkg != NULL
 246                                     && (compound_depend->type == RECOMMEND
 247                                         || compound_depend->type == SUGGEST)
 248                                     && (satisfying_pkg->state_want ==
 249                                         SW_DEINSTALL
 250                                         || satisfying_pkg->state_want ==
 251                                         SW_PURGE)) {
 252                                         opkg_msg(NOTICE,
 253                                                  "%s: ignoring recommendation for "
 254                                                  "%s at user request\n",
 255                                                  pkg->name,
 256                                                  satisfying_pkg->name);
 257                                         continue;
 258                                 }
 259
 260                                 opkg_msg(DEBUG, "satisfying_pkg=%p\n",
 261                                          satisfying_pkg);
 262                                 if (satisfying_pkg != NULL) {
 263                                         satisfier_entry_pkg = satisfying_pkg;
 264                                         break;
 265                                 }
 266                         }
 267                 }
 268
 269                 /* we didn't find one, add something to the unsatisfied vector */
 270                 if (!found) {
 271                         if (!satisfier_entry_pkg) {
 272                                 /* failure to meet recommendations is not an error */
 273                                 if (compound_depend->type != RECOMMEND
 274                                     && compound_depend->type != SUGGEST)
 275                                         the_lost =
 276                                             add_unresolved_dep(pkg, the_lost,
 277                                                                i);
 278                                 else
 279                                         opkg_msg(NOTICE,
 280                                                  "%s: unsatisfied recommendation for %s\n",
 281                                                  pkg->name,
 282                                                  compound_depend->
 283                                                  possibilities[0]->pkg->name);
 284                         } else {
 285                                 if (compound_depend->type == SUGGEST) {
 286                                         /* just mention it politely */
 287                                         opkg_msg(NOTICE,
 288                                                  "package %s suggests installing %s\n",
 289                                                  pkg->name,
 290                                                  satisfier_entry_pkg->name);
 291                                 } else {
 292                                         char **newstuff = NULL;
 293
 294                                         if (satisfier_entry_pkg != pkg &&
 295                                             !is_pkg_in_pkg_vec(unsatisfied,
 296                                                                satisfier_entry_pkg))
 297                                         {
 298                                                 pkg_vec_insert(unsatisfied,
 299                                                                satisfier_entry_pkg);
 300                                                 pkg_hash_fetch_unsatisfied_dependencies
 301                                                     (satisfier_entry_pkg,
 302                                                      unsatisfied, &newstuff);
 303                                                 the_lost =
 304                                                     merge_unresolved(the_lost,
 305                                                                      newstuff);
 306                                                 if (newstuff)
 307                                                         free(newstuff);
 308                                         }
 309                                 }
 310                         }
 311                 }
 312         }
 313         *unresolved = the_lost;
 314
 315         return unsatisfied->len;
 316 }
 317
 318 /*checking for conflicts !in replaces
 319   If a packages conflicts with another but is also replacing it, I should not consider it a
 320   really conflicts
 321   returns 0 if conflicts <> replaces or 1 if conflicts == replaces
 322 */
 323 static int is_pkg_a_replaces(pkg_t * pkg_scout, pkg_t * pkg)
 324 {
 325         int i;
 326         int replaces_count = pkg->replaces_count;
 327         abstract_pkg_t **replaces;
 328
 329         if (pkg->replaces_count == 0)   // No replaces, it's surely a conflict
 330                 return 0;
 331
 332         replaces = pkg->replaces;
 333
 334         for (i = 0; i < replaces_count; i++) {
 335                 if (strcmp(pkg_scout->name, pkg->replaces[i]->name) == 0) {     // Found
 336                         opkg_msg(DEBUG2, "Seems I've found a replace %s %s\n",
 337                                  pkg_scout->name, pkg->replaces[i]->name);
 338                         return 1;
 339                 }
 340         }
 341         return 0;
 342
 343 }
 344
 345 pkg_vec_t *pkg_hash_fetch_conflicts(pkg_t * pkg)
 346 {
 347         pkg_vec_t *installed_conflicts, *test_vec;
 348         compound_depend_t *conflicts;
 349         depend_t **possible_satisfiers;
 350         depend_t *possible_satisfier;
 351         int i, j, k;
 352         int count;
 353         abstract_pkg_t *ab_pkg;
 354         pkg_t **pkg_scouts;
 355         pkg_t *pkg_scout;
 356
 357         /*
 358          * this is a setup to check for redundant/cyclic dependency checks,
 359          * which are marked at the abstract_pkg level
 360          */
 361         if (!(ab_pkg = pkg->parent)) {
 362                 opkg_msg(ERROR, "Internal error: %s not in hash table\n",
 363                          pkg->name);
 364                 return (pkg_vec_t *) NULL;
 365         }
 366
 367         conflicts = pkg->conflicts;
 368         if (!conflicts) {
 369                 return (pkg_vec_t *) NULL;
 370         }
 371         installed_conflicts = pkg_vec_alloc();
 372
 373         count = pkg->conflicts_count;
 374
 375         /* foreach conflict */
 376         for (i = 0; i < pkg->conflicts_count; i++) {
 377
 378                 possible_satisfiers = conflicts->possibilities;
 379
 380                 /* foreach possible satisfier */
 381                 for (j = 0; j < conflicts->possibility_count; j++) {
 382                         possible_satisfier = possible_satisfiers[j];
 383                         if (!possible_satisfier)
 384                                 opkg_msg(ERROR,
 385                                          "Internal error: possible_satisfier=NULL\n");
 386                         if (!possible_satisfier->pkg)
 387                                 opkg_msg(ERROR,
 388                                          "Internal error: possible_satisfier->pkg=NULL\n");
 389                         test_vec = possible_satisfier->pkg->pkgs;
 390                         if (test_vec) {
 391                                 /* pkg_vec found, it is an actual package conflict
 392                                  * cruise this possiblity's pkg_vec looking for an installed version */
 393                                 pkg_scouts = test_vec->pkgs;
 394                                 for (k = 0; k < test_vec->len; k++) {
 395                                         pkg_scout = pkg_scouts[k];
 396                                         if (!pkg_scout) {
 397                                                 opkg_msg(ERROR,
 398                                                          "Internal error: pkg_scout=NULL\n");
 399                                                 continue;
 400                                         }
 401                                         if ((pkg_scout->state_status ==
 402                                              SS_INSTALLED
 403                                              || pkg_scout->state_want ==
 404                                              SW_INSTALL)
 405                                             &&
 406                                             version_constraints_satisfied
 407                                             (possible_satisfier, pkg_scout)
 408                                             && !is_pkg_a_replaces(pkg_scout,
 409                                                                   pkg)) {
 410                                                 if (!is_pkg_in_pkg_vec
 411                                                     (installed_conflicts,
 412                                                      pkg_scout)) {
 413                                                         pkg_vec_insert
 414                                                             (installed_conflicts,
 415                                                              pkg_scout);
 416                                                 }
 417                                         }
 418                                 }
 419                         }
 420                 }
 421                 conflicts++;
 422         }
 423
 424         if (installed_conflicts->len)
 425                 return installed_conflicts;
 426         pkg_vec_free(installed_conflicts);
 427         return (pkg_vec_t *) NULL;
 428 }
 429
 430 int version_constraints_satisfied(depend_t * depends, pkg_t * pkg)
 431 {
 432         pkg_t *temp;
 433         int comparison;
 434
 435         if (depends->constraint == NONE)
 436                 return 1;
 437
 438         temp = pkg_new();
 439
 440         parse_version(temp, depends->version);
 441
 442         comparison = pkg_compare_versions(pkg, temp);
 443
 444         free(temp->version);
 445         free(temp);
 446
 447         if ((depends->constraint == EARLIER) && (comparison < 0))
 448                 return 1;
 449         else if ((depends->constraint == LATER) && (comparison > 0))
 450                 return 1;
 451         else if (comparison == 0)
 452                 return 1;
 453         else if ((depends->constraint == LATER_EQUAL) && (comparison >= 0))
 454                 return 1;
 455         else if ((depends->constraint == EARLIER_EQUAL) && (comparison <= 0))
 456                 return 1;
 457
 458         return 0;
 459 }
 460
 461 int pkg_dependence_satisfiable(depend_t * depend)
 462 {
 463         abstract_pkg_t *apkg = depend->pkg;
 464         abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 465         int n_providers = provider_apkgs->len;
 466         abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 467         pkg_vec_t *pkg_vec;
 468         int n_pkgs;
 469         int i;
 470         int j;
 471
 472         for (i = 0; i < n_providers; i++) {
 473                 abstract_pkg_t *papkg = apkgs[i];
 474                 pkg_vec = papkg->pkgs;
 475                 if (pkg_vec) {
 476                         n_pkgs = pkg_vec->len;
 477                         for (j = 0; j < n_pkgs; j++) {
 478                                 pkg_t *pkg = pkg_vec->pkgs[j];
 479                                 if (version_constraints_satisfied(depend, pkg)) {
 480                                         return 1;
 481                                 }
 482                         }
 483                 }
 484         }
 485         return 0;
 486 }
 487
 488 int pkg_dependence_satisfied(depend_t * depend)
 489 {
 490         abstract_pkg_t *apkg = depend->pkg;
 491         abstract_pkg_vec_t *provider_apkgs = apkg->provided_by;
 492         int n_providers = provider_apkgs->len;
 493         abstract_pkg_t **apkgs = provider_apkgs->pkgs;
 494         int i;
 495         int n_pkgs;
 496         int j;
 497
 498         for (i = 0; i < n_providers; i++) {
 499                 abstract_pkg_t *papkg = apkgs[i];
 500                 pkg_vec_t *pkg_vec = papkg->pkgs;
 501                 if (pkg_vec) {
 502                         n_pkgs = pkg_vec->len;
 503                         for (j = 0; j < n_pkgs; j++) {
 504                                 pkg_t *pkg = pkg_vec->pkgs[j];
 505                                 if (version_constraints_satisfied(depend, pkg)) {
 506                                         if (pkg->state_status == SS_INSTALLED
 507                                             || pkg->state_status == SS_UNPACKED)
 508                                                 return 1;
 509                                 }
 510                         }
 511                 }
 512         }
 513         return 0;
 514 }
 515
 516 static int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg)
 517 {
 518         int i;
 519         pkg_t **pkgs = vec->pkgs;
 520
 521         for (i = 0; i < vec->len; i++)
 522                 if ((strcmp(pkg->name, (*(pkgs + i))->name) == 0)
 523                     && (pkg_compare_versions(pkg, *(pkgs + i)) == 0)
 524                     && (strcmp(pkg->architecture, (*(pkgs + i))->architecture)
 525                         == 0))
 526                         return 1;
 527         return 0;
 528 }
 529
 530 /**
 531  * pkg_replaces returns 1 if pkg->replaces contains one of replacee's provides and 0
 532  * otherwise.
 533  */
 534 int pkg_replaces(pkg_t * pkg, pkg_t * replacee)
 535 {
 536         abstract_pkg_t **replaces = pkg->replaces;
 537         int replaces_count = pkg->replaces_count;
 538         int replacee_provides_count = replacee->provides_count;
 539         int i, j;
 540         for (i = 0; i < replaces_count; i++) {
 541                 abstract_pkg_t *abstract_replacee = replaces[i];
 542                 for (j = 0; j < replacee_provides_count; j++) {
 543                         if (replacee->provides[j] == abstract_replacee)
 544                                 return 1;
 545                 }
 546         }
 547         return 0;
 548 }
 549
 550 /**
 551  * pkg_conflicts_abstract returns 1 if pkg->conflicts contains conflictee and 0
 552  * otherwise.
 553  */
 554 int pkg_conflicts_abstract(pkg_t * pkg, abstract_pkg_t * conflictee)
 555 {
 556         compound_depend_t *conflicts = pkg->conflicts;
 557         int conflicts_count = pkg->conflicts_count;
 558         int i, j;
 559         for (i = 0; i < conflicts_count; i++) {
 560                 int possibility_count = conflicts[i].possibility_count;
 561                 struct depend **possibilities = conflicts[i].possibilities;
 562                 for (j = 0; j < possibility_count; j++) {
 563                         if (possibilities[j]->pkg == conflictee) {
 564                                 return 1;
 565                         }
 566                 }
 567         }
 568         return 0;
 569 }
 570
 571 /**
 572  * pkg_conflicts returns 1 if pkg->conflicts contains one of
 573  * conflictee's provides and 0 otherwise.
 574  */
 575 int pkg_conflicts(pkg_t * pkg, pkg_t * conflictee)
 576 {
 577         compound_depend_t *conflicts = pkg->conflicts;
 578         int conflicts_count = pkg->conflicts_count;
 579         abstract_pkg_t **conflictee_provides = conflictee->provides;
 580         int conflictee_provides_count = conflictee->provides_count;
 581         int i, j, k;
 582         int possibility_count;
 583         struct depend **possibilities;
 584         abstract_pkg_t *possibility;
 585
 586         for (i = 0; i < conflicts_count; i++) {
 587                 possibility_count = conflicts[i].possibility_count;
 588                 possibilities = conflicts[i].possibilities;
 589                 for (j = 0; j < possibility_count; j++) {
 590                         possibility = possibilities[j]->pkg;
 591                         for (k = 0; k < conflictee_provides_count; k++) {
 592                                 if (possibility == conflictee_provides[k]) {
 593                                         return 1;
 594                                 }
 595                         }
 596                 }
 597         }
 598         return 0;
 599 }
 600
 601 static char **merge_unresolved(char **oldstuff, char **newstuff)
 602 {
 603         int oldlen = 0, newlen = 0;
 604         char **result;
 605         int i, j;
 606
 607         if (!newstuff)
 608                 return oldstuff;
 609
 610         while (oldstuff && oldstuff[oldlen])
 611                 oldlen++;
 612         while (newstuff && newstuff[newlen])
 613                 newlen++;
 614
 615         result = xrealloc(oldstuff, sizeof(char *) * (oldlen + newlen + 1));
 616
 617         for (i = oldlen, j = 0; i < (oldlen + newlen); i++, j++)
 618                 *(result + i) = *(newstuff + j);
 619
 620         *(result + i) = NULL;
 621
 622         return result;
 623 }
 624
 625 /*
 626  * a kinda kludgy way to back out depends str from two different arrays (reg'l'r 'n pre)
 627  * this is null terminated, no count is carried around
 628  */
 629 char **add_unresolved_dep(pkg_t * pkg, char **the_lost, int ref_ndx)
 630 {
 631         int count;
 632         char **resized;
 633
 634         count = 0;
 635         while (the_lost && the_lost[count])
 636                 count++;
 637
 638         count++;                /* need one to hold the null */
 639         resized = xrealloc(the_lost, sizeof(char *) * (count + 1));
 640         resized[count - 1] = pkg_depend_str(pkg, ref_ndx);
 641         resized[count] = NULL;
 642
 643         return resized;
 644 }
 645
 646 void buildProvides(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 647 {
 648         int i;
 649
 650         /* every pkg provides itself */
 651         pkg->provides_count++;
 652         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 653         pkg->provides = xcalloc(pkg->provides_count, sizeof(abstract_pkg_t *));
 654         pkg->provides[0] = ab_pkg;
 655
 656         for (i = 1; i < pkg->provides_count; i++) {
 657                 abstract_pkg_t *provided_abpkg =
 658                     ensure_abstract_pkg_by_name(pkg->provides_str[i - 1]);
 659                 free(pkg->provides_str[i - 1]);
 660
 661                 pkg->provides[i] = provided_abpkg;
 662
 663                 abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 664         }
 665         if (pkg->provides_str)
 666                 free(pkg->provides_str);
 667 }
 668
 669 void buildConflicts(pkg_t * pkg)
 670 {
 671         int i;
 672         compound_depend_t *conflicts;
 673
 674         if (!pkg->conflicts_count)
 675                 return;
 676
 677         conflicts = pkg->conflicts =
 678             xcalloc(pkg->conflicts_count, sizeof(compound_depend_t));
 679         for (i = 0; i < pkg->conflicts_count; i++) {
 680                 conflicts->type = CONFLICTS;
 681                 parseDepends(conflicts, pkg->conflicts_str[i]);
 682                 free(pkg->conflicts_str[i]);
 683                 conflicts++;
 684         }
 685         if (pkg->conflicts_str)
 686                 free(pkg->conflicts_str);
 687 }
 688
 689 void buildReplaces(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 690 {
 691         int i;
 692
 693         if (!pkg->replaces_count)
 694                 return;
 695
 696         pkg->replaces = xcalloc(pkg->replaces_count, sizeof(abstract_pkg_t *));
 697
 698         for (i = 0; i < pkg->replaces_count; i++) {
 699                 abstract_pkg_t *old_abpkg =
 700                     ensure_abstract_pkg_by_name(pkg->replaces_str[i]);
 701
 702                 pkg->replaces[i] = old_abpkg;
 703                 free(pkg->replaces_str[i]);
 704
 705                 if (!old_abpkg->replaced_by)
 706                         old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 707                 /* if a package pkg both replaces and conflicts old_abpkg,
 708                  * then add it to the replaced_by vector so that old_abpkg
 709                  * will be upgraded to ab_pkg automatically */
 710                 if (pkg_conflicts_abstract(pkg, old_abpkg))
 711                         abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 712         }
 713
 714         if (pkg->replaces_str)
 715                 free(pkg->replaces_str);
 716 }
 717
 718 void buildDepends(pkg_t * pkg)
 719 {
 720         unsigned int count;
 721         int i;
 722         compound_depend_t *depends;
 723
 724         if (!
 725             (count =
 726              pkg->pre_depends_count + pkg->depends_count +
 727              pkg->recommends_count + pkg->suggests_count))
 728                 return;
 729
 730         depends = pkg->depends = xcalloc(count, sizeof(compound_depend_t));
 731
 732         for (i = 0; i < pkg->pre_depends_count; i++) {
 733                 parseDepends(depends, pkg->pre_depends_str[i]);
 734                 free(pkg->pre_depends_str[i]);
 735                 depends->type = PREDEPEND;
 736                 depends++;
 737         }
 738         if (pkg->pre_depends_str)
 739                 free(pkg->pre_depends_str);
 740
 741         for (i = 0; i < pkg->depends_count; i++) {
 742                 parseDepends(depends, pkg->depends_str[i]);
 743                 free(pkg->depends_str[i]);
 744                 depends++;
 745         }
 746         if (pkg->depends_str)
 747                 free(pkg->depends_str);
 748
 749         for (i = 0; i < pkg->recommends_count; i++) {
 750                 parseDepends(depends, pkg->recommends_str[i]);
 751                 free(pkg->recommends_str[i]);
 752                 depends->type = RECOMMEND;
 753                 depends++;
 754         }
 755         if (pkg->recommends_str)
 756                 free(pkg->recommends_str);
 757
 758         for (i = 0; i < pkg->suggests_count; i++) {
 759                 parseDepends(depends, pkg->suggests_str[i]);
 760                 free(pkg->suggests_str[i]);
 761                 depends->type = SUGGEST;
 762                 depends++;
 763         }
 764         if (pkg->suggests_str)
 765                 free(pkg->suggests_str);
 766 }
 767
 768 const char *constraint_to_str(enum version_constraint c)
 769 {
 770         switch (c) {
 771         case NONE:
 772                 return "";
 773         case EARLIER:
 774                 return "< ";
 775         case EARLIER_EQUAL:
 776                 return "<= ";
 777         case EQUAL:
 778                 return "= ";
 779         case LATER_EQUAL:
 780                 return ">= ";
 781         case LATER:
 782                 return "> ";
 783         }
 784
 785         return "";
 786 }
 787
 788 /*
 789  * Returns a printable string for pkg's dependency at the specified idx. The
 790  * resultant string must be passed to free() by the caller.
 791  */
 792 char *pkg_depend_str(pkg_t * pkg, int idx)
 793 {
 794         int i;
 795         unsigned int len;
 796         char *str;
 797         compound_depend_t *cdep;
 798         depend_t *dep;
 799
 800         len = 0;
 801         cdep = &pkg->depends[idx];
 802
 803         /* calculate string length */
 804         for (i = 0; i < cdep->possibility_count; i++) {
 805                 dep = cdep->possibilities[i];
 806
 807                 if (i != 0)
 808                         len += 3;       /* space, pipe, space */
 809
 810                 len += strlen(dep->pkg->name);
 811
 812                 if (dep->version) {
 813                         len += 2;       /* space, left parenthesis */
 814                         len += 3;       /* constraint string (<=, >=, etc), space */
 815                         len += strlen(dep->version);
 816                         len += 1;       /* right parenthesis */
 817                 }
 818         }
 819
 820         str = xmalloc(len + 1); /* +1 for the NULL terminator */
 821         str[0] = '\0';
 822
 823         for (i = 0; i < cdep->possibility_count; i++) {
 824                 dep = cdep->possibilities[i];
 825
 826                 if (i != 0)
 827                         strncat(str, " | ", len);
 828
 829                 strncat(str, dep->pkg->name, len);
 830
 831                 if (dep->version) {
 832                         strncat(str, " (", len);
 833                         strncat(str, constraint_to_str(dep->constraint), len);
 834                         strncat(str, dep->version, len);
 835                         strncat(str, ")", len);
 836                 }
 837         }
 838
 839         return str;
 840 }
 841
 842 void buildDependedUponBy(pkg_t * pkg, abstract_pkg_t * ab_pkg)
 843 {
 844         compound_depend_t *depends;
 845         int count, othercount;
 846         int i, j;
 847         abstract_pkg_t *ab_depend;
 848         abstract_pkg_t **temp;
 849
 850         count = pkg->pre_depends_count +
 851             pkg->depends_count + pkg->recommends_count + pkg->suggests_count;
 852
 853         for (i = 0; i < count; i++) {
 854                 depends = &pkg->depends[i];
 855                 if (depends->type != PREDEPEND
 856                     && depends->type != DEPEND && depends->type != RECOMMEND)
 857                         continue;
 858                 for (j = 0; j < depends->possibility_count; j++) {
 859                         ab_depend = depends->possibilities[j]->pkg;
 860                         if (!ab_depend->depended_upon_by) {
 861                                 ab_depend->depended_upon_by =
 862                                     xcalloc(1, sizeof(abstract_pkg_t *));
 863                         }
 864
 865                         temp = ab_depend->depended_upon_by;
 866                         othercount = 1;
 867                         while (*temp) {
 868                                 temp++;
 869                                 othercount++;
 870                         }
 871                         *temp = ab_pkg;
 872
 873                         ab_depend->depended_upon_by =
 874                             xrealloc(ab_depend->depended_upon_by,
 875                                      (othercount +
 876                                       1) * sizeof(abstract_pkg_t *));
 877
 878                         /* the array may have been moved by realloc */
 879                         temp = ab_depend->depended_upon_by + othercount;
 880                         *temp = NULL;
 881                 }
 882         }
 883 }
 884
 885 static depend_t *depend_init(void)
 886 {
 887         depend_t *d = xcalloc(1, sizeof(depend_t));
 888         d->constraint = NONE;
 889         d->version = NULL;
 890         d->pkg = NULL;
 891
 892         return d;
 893 }
 894
 895 static int parseDepends(compound_depend_t * compound_depend, char *depend_str)
 896 {
 897         char *pkg_name, buffer[2048];
 898         unsigned int num_of_ors = 0;
 899         int i;
 900         char *src, *dest;
 901         depend_t **possibilities;
 902
 903         /* first count the number of ored possibilities for satisfying dependency */
 904         src = depend_str;
 905         while (*src)
 906                 if (*src++ == '|')
 907                         num_of_ors++;
 908
 909         compound_depend->type = DEPEND;
 910
 911         compound_depend->possibility_count = num_of_ors + 1;
 912         possibilities = xcalloc((num_of_ors + 1), sizeof(depend_t *));
 913         compound_depend->possibilities = possibilities;
 914
 915         src = depend_str;
 916         for (i = 0; i < num_of_ors + 1; i++) {
 917                 possibilities[i] = depend_init();
 918                 /* gobble up just the name first */
 919                 dest = buffer;
 920                 while (*src &&
 921                        !isspace(*src) &&
 922                        (*src != '(') && (*src != '*') && (*src != '|'))
 923                         *dest++ = *src++;
 924                 *dest = '\0';
 925                 pkg_name = trim_xstrdup(buffer);
 926
 927                 /* now look at possible version info */
 928
 929                 /* skip to next chars */
 930                 if (isspace(*src))
 931                         while (*src && isspace(*src))
 932                                 src++;
 933
 934                 /* extract constraint and version */
 935                 if (*src == '(') {
 936                         src++;
 937                         if (!strncmp(src, "<<", 2)) {
 938                                 possibilities[i]->constraint = EARLIER;
 939                                 src += 2;
 940                         } else if (!strncmp(src, "<=", 2)) {
 941                                 possibilities[i]->constraint = EARLIER_EQUAL;
 942                                 src += 2;
 943                         } else if (!strncmp(src, ">=", 2)) {
 944                                 possibilities[i]->constraint = LATER_EQUAL;
 945                                 src += 2;
 946                         } else if (!strncmp(src, ">>", 2)) {
 947                                 possibilities[i]->constraint = LATER;
 948                                 src += 2;
 949                         } else if (!strncmp(src, "=", 1)) {
 950                                 possibilities[i]->constraint = EQUAL;
 951                                 src++;
 952                         }
 953                         /* should these be here to support deprecated designations; dpkg does */
 954                         else if (!strncmp(src, "<", 1)) {
 955                                 possibilities[i]->constraint = EARLIER_EQUAL;
 956                                 src++;
 957                         } else if (!strncmp(src, ">", 1)) {
 958                                 possibilities[i]->constraint = LATER_EQUAL;
 959                                 src++;
 960                         }
 961
 962                         /* now we have any constraint, pass space to version string */
 963                         while (isspace(*src))
 964                                 src++;
 965
 966                         /* this would be the version string */
 967                         dest = buffer;
 968                         while (*src && *src != ')')
 969                                 *dest++ = *src++;
 970                         *dest = '\0';
 971
 972                         possibilities[i]->version = trim_xstrdup(buffer);
 973                 }
 974                 /* hook up the dependency to its abstract pkg */
 975                 possibilities[i]->pkg = ensure_abstract_pkg_by_name(pkg_name);
 976
 977                 free(pkg_name);
 978
 979                 /* now get past the ) and any possible | chars */
 980                 while (*src &&
 981                        (isspace(*src) || (*src == ')') || (*src == '|')))
 982                         src++;
 983                 if (*src == '*') {
 984                         compound_depend->type = GREEDY_DEPEND;
 985                         src++;
 986                 }
 987         }
 988
 989         return 0;
 990 }