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