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         int i, j;
 468         compound_depend_t *conflicts;
 469
 470         for (conflicts = pkg_get_ptr(pkg, PKG_CONFLICTS), i = 0; conflicts && conflicts[i].type; i++)
 471                 for (j = 0; j < conflicts[i].possibility_count; j++)
 472                         if (conflicts[i].possibilities[j]->pkg == conflictee)
 473                                 return 1;
 474
 475         return 0;
 476 }
 477
 478 /**
 479  * pkg_conflicts returns 1 if pkg->conflicts contains one of
 480  * conflictee's provides and 0 otherwise.
 481  */
 482 int pkg_conflicts(pkg_t * pkg, pkg_t * conflictee)
 483 {
 484         int i, j;
 485         compound_depend_t *conflicts;
 486         abstract_pkg_t **provider;
 487
 488         for (conflicts = pkg_get_ptr(pkg, PKG_CONFLICTS), i = 0; conflicts && conflicts[i].type; i++)
 489                 for (j = 0; j < conflicts[i].possibility_count; j++)
 490                         for (provider = pkg_get_ptr(conflictee, PKG_PROVIDES); provider && *provider; provider++)
 491                                 if (conflicts[i].possibilities[j]->pkg == *provider)
 492                                         return 1;
 493
 494         return 0;
 495 }
 496
 497 static char **merge_unresolved(char **oldstuff, char **newstuff)
 498 {
 499         int oldlen = 0, newlen = 0;
 500         char **result;
 501         int i, j;
 502
 503         if (!newstuff)
 504                 return oldstuff;
 505
 506         while (oldstuff && oldstuff[oldlen])
 507                 oldlen++;
 508         while (newstuff && newstuff[newlen])
 509                 newlen++;
 510
 511         result = xrealloc(oldstuff, sizeof(char *) * (oldlen + newlen + 1));
 512
 513         for (i = oldlen, j = 0; i < (oldlen + newlen); i++, j++)
 514                 *(result + i) = *(newstuff + j);
 515
 516         *(result + i) = NULL;
 517
 518         return result;
 519 }
 520
 521 /*
 522  * a kinda kludgy way to back out depends str from two different arrays (reg'l'r 'n pre)
 523  * this is null terminated, no count is carried around
 524  */
 525 char **add_unresolved_dep(pkg_t * pkg, char **the_lost, int ref_ndx)
 526 {
 527         int count;
 528         char **resized;
 529
 530         count = 0;
 531         while (the_lost && the_lost[count])
 532                 count++;
 533
 534         count++;                /* need one to hold the null */
 535         resized = xrealloc(the_lost, sizeof(char *) * (count + 1));
 536         resized[count - 1] = pkg_depend_str(pkg, ref_ndx);
 537         resized[count] = NULL;
 538
 539         return resized;
 540 }
 541
 542 static void flag_related_packages(pkg_t *pkg, int state_flags)
 543 {
 544         int i, j;
 545         compound_depend_t *deps;
 546
 547         for (deps = pkg_get_ptr(pkg, PKG_DEPENDS), i = 0; deps && deps[i].type; i++)
 548                 for (j = 0; j < deps[i].possibility_count; j++) {
 549                         if ((deps[i].possibilities[j]->pkg->state_flag & state_flags) != state_flags) {
 550                                 opkg_msg(DEBUG, "propagating pkg flag to dependent abpkg %s\n",
 551                                          deps[i].possibilities[j]->pkg->name);
 552                                 deps[i].possibilities[j]->pkg->state_flag |= state_flags;
 553                         }
 554                 }
 555
 556         for (deps = pkg_get_ptr(pkg, PKG_CONFLICTS), i = 0; deps && deps[i].type; i++)
 557                 for (j = 0; j < deps[i].possibility_count; j++) {
 558                         if ((deps[i].possibilities[j]->pkg->state_flag & state_flags) != state_flags) {
 559                                 opkg_msg(DEBUG, "propagating pkg flag to conflicting abpkg %s\n",
 560                                          deps[i].possibilities[j]->pkg->name);
 561                                 deps[i].possibilities[j]->pkg->state_flag |= state_flags;
 562                         }
 563                 }
 564 }
 565
 566 abstract_pkg_t **init_providelist(pkg_t *pkg, int *count)
 567 {
 568         abstract_pkg_t *ab_pkg;
 569         abstract_pkg_t **provides = pkg_get_ptr(pkg, PKG_PROVIDES);
 570
 571         if (!provides) {
 572                 provides = calloc(2, sizeof(abstract_pkg_t *));
 573
 574                 if (!provides) {
 575                         if (count)
 576                                 *count = 0;
 577
 578                         return NULL;
 579                 }
 580
 581                 ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 582
 583                 if (!ab_pkg->pkgs)
 584                         ab_pkg->pkgs = pkg_vec_alloc();
 585
 586                 if (!abstract_pkg_vec_contains(ab_pkg->provided_by, ab_pkg))
 587                         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 588
 589                 provides[0] = ab_pkg;
 590                 provides[1] = NULL;
 591
 592                 if (count)
 593                         *count = 2;
 594
 595                 pkg_set_ptr(pkg, PKG_PROVIDES, provides);
 596         }
 597         else if (count) {
 598                 for (*count = 1; *provides; provides++) {
 599                         if (pkg->state_flag & SF_NEED_DETAIL) {
 600                                 if (!((*provides)->state_flag & SF_NEED_DETAIL)) {
 601                                         opkg_msg(DEBUG, "propagating pkg flag to provided abpkg %s\n",
 602                                                  (*provides)->name);
 603                                         (*provides)->state_flag |= SF_NEED_DETAIL;
 604                                 }
 605                         }
 606                         (*count)++;
 607                 }
 608         }
 609
 610         flag_related_packages(pkg, SF_NEED_DETAIL);
 611
 612         return provides;
 613 }
 614
 615 void parse_providelist(pkg_t *pkg, char *list)
 616 {
 617         int count = 0;
 618         char *item, *tok;
 619         abstract_pkg_t *ab_pkg, *provided_abpkg, **tmp, **provides;
 620
 621         provides = init_providelist(pkg, &count);
 622         ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 623
 624         if (!provides || !ab_pkg)
 625                 return;
 626
 627         for (item = strtok_r(list, ", ", &tok); item;
 628              count++, item = strtok_r(NULL, ", ", &tok)) {
 629                 tmp = realloc(provides, sizeof(abstract_pkg_t *) * (count + 1));
 630
 631                 if (!tmp)
 632                         break;
 633
 634                 provided_abpkg = ensure_abstract_pkg_by_name(item);
 635
 636                 if (provided_abpkg->state_flag & SF_NEED_DETAIL) {
 637                         if (!(ab_pkg->state_flag & SF_NEED_DETAIL)) {
 638                                 opkg_msg(DEBUG, "propagating provided abpkg flag to "
 639                                                 "provider abpkg %s\n", ab_pkg->name);
 640                                 ab_pkg->state_flag |= SF_NEED_DETAIL;
 641                         }
 642                 }
 643
 644                 if (!abstract_pkg_vec_contains(provided_abpkg->provided_by, ab_pkg))
 645                         abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 646
 647                 provides = tmp;
 648                 provides[count - 1] = provided_abpkg;
 649         }
 650
 651         provides[count - 1] = NULL;
 652
 653         pkg_set_ptr(pkg, PKG_PROVIDES, provides);
 654 }
 655
 656 void parse_replacelist(pkg_t *pkg, char *list)
 657 {
 658         int count;
 659         char *item, *tok;
 660         abstract_pkg_t *ab_pkg, *old_abpkg, **tmp, **replaces = NULL;
 661
 662         ab_pkg = ensure_abstract_pkg_by_name(pkg->name);
 663
 664         if (!ab_pkg->pkgs)
 665                 ab_pkg->pkgs = pkg_vec_alloc();
 666
 667         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 668
 669         for (count = 1, item = strtok_r(list, ", ", &tok); item;
 670              count++, item = strtok_r(NULL, ", ", &tok)) {
 671                 tmp = realloc(replaces, sizeof(abstract_pkg_t *) * (count + 1));
 672
 673                 if (!tmp)
 674                         break;
 675
 676                 old_abpkg = ensure_abstract_pkg_by_name(item);
 677
 678                 if (pkg->state_flag & SF_NEED_DETAIL) {
 679                         if (!(old_abpkg->state_flag & SF_NEED_DETAIL)) {
 680                                 opkg_msg(DEBUG, "propagating pkg flag to replaced abpkg %s\n",
 681                                          old_abpkg->name);
 682                                 old_abpkg->state_flag |= SF_NEED_DETAIL;
 683                         }
 684                 }
 685
 686                 if (!old_abpkg->replaced_by)
 687                         old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 688
 689                 /* if a package pkg both replaces and conflicts old_abpkg,
 690                  * then add it to the replaced_by vector so that old_abpkg
 691                  * will be upgraded to ab_pkg automatically */
 692                 if (pkg_conflicts_abstract(pkg, old_abpkg)) {
 693                         if (!abstract_pkg_vec_contains(old_abpkg->replaced_by, ab_pkg))
 694                                 abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 695                 }
 696
 697                 replaces = tmp;
 698                 replaces[count - 1] = old_abpkg;
 699         }
 700
 701         if (!replaces)
 702                 return;
 703
 704         replaces[count - 1] = NULL;
 705
 706         pkg_set_ptr(pkg, PKG_REPLACES, replaces);
 707 }
 708
 709 void buildProvides(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 710 {
 711 #if 0
 712         int i;
 713
 714         /* every pkg provides itself */
 715         pkg->provides_count++;
 716         abstract_pkg_vec_insert(ab_pkg->provided_by, ab_pkg);
 717         pkg->provides = xcalloc(pkg->provides_count, sizeof(abstract_pkg_t *));
 718         pkg->provides[0] = ab_pkg;
 719         for (i = 1; i < pkg->provides_count; i++) {
 720                 abstract_pkg_t *provided_abpkg =
 721                     ensure_abstract_pkg_by_name(pkg->provides_str[i - 1]);
 722                 free(pkg->provides_str[i - 1]);
 723
 724                 pkg->provides[i] = provided_abpkg;
 725
 726                 abstract_pkg_vec_insert(provided_abpkg->provided_by, ab_pkg);
 727         }
 728         if (pkg->provides_str)
 729                 free(pkg->provides_str);
 730 #endif
 731 }
 732
 733 void buildConflicts(pkg_t * pkg)
 734 {
 735         /*
 736         int i;
 737         compound_depend_t *conflicts, *conflict;
 738
 739         if (!pkg->conflicts_count)
 740                 return;
 741
 742         conflicts = pkg->conflicts =
 743             xcalloc(pkg->conflicts_count, sizeof(compound_depend_t));
 744         for (i = 0; i < pkg->conflicts_count; i++) {
 745                 conflicts->type = CONFLICTS;
 746                 parseDepends(conflicts, pkg->conflicts_str[i]);
 747                 free(pkg->conflicts_str[i]);
 748                 conflicts++;
 749         }
 750         if (pkg->conflicts_str)
 751                 free(pkg->conflicts_str);
 752                 */
 753 }
 754
 755 void buildReplaces(abstract_pkg_t * ab_pkg, pkg_t * pkg)
 756 {
 757 #if 0
 758         int i;
 759
 760         if (!pkg->replaces_count)
 761                 return;
 762
 763         pkg->replaces = xcalloc(pkg->replaces_count, sizeof(abstract_pkg_t *));
 764
 765         for (i = 0; i < pkg->replaces_count; i++) {
 766                 abstract_pkg_t *old_abpkg =
 767                     ensure_abstract_pkg_by_name(pkg->replaces_str[i]);
 768
 769                 pkg->replaces[i] = old_abpkg;
 770                 free(pkg->replaces_str[i]);
 771
 772                 if (!old_abpkg->replaced_by)
 773                         old_abpkg->replaced_by = abstract_pkg_vec_alloc();
 774                 /* if a package pkg both replaces and conflicts old_abpkg,
 775                  * then add it to the replaced_by vector so that old_abpkg
 776                  * will be upgraded to ab_pkg automatically */
 777                 if (pkg_conflicts_abstract(pkg, old_abpkg))
 778                         abstract_pkg_vec_insert(old_abpkg->replaced_by, ab_pkg);
 779         }
 780
 781         if (pkg->replaces_str)
 782                 free(pkg->replaces_str);
 783 #endif
 784 }
 785
 786 void parse_deplist(pkg_t *pkg, enum depend_type type, char *list)
 787 {
 788         int id, count;
 789         char *item, *tok;
 790         compound_depend_t *tmp, *deps;
 791
 792         switch (type)
 793         {
 794         case DEPEND:
 795         case PREDEPEND:
 796         case RECOMMEND:
 797         case SUGGEST:
 798         case GREEDY_DEPEND:
 799                 id = PKG_DEPENDS;
 800                 break;
 801
 802         case CONFLICTS:
 803                 id = PKG_CONFLICTS;
 804                 break;
 805
 806         default:
 807                 return;
 808         }
 809
 810         deps = pkg_get_ptr(pkg, id);
 811
 812         for (tmp = deps, count = 1; tmp && tmp->type; tmp++)
 813                 count++;
 814
 815         for (item = strtok_r(list, ",", &tok); item; item = strtok_r(NULL, ",", &tok), count++) {
 816                 tmp = realloc(deps, sizeof(compound_depend_t) * (count + 1));
 817
 818                 if (!tmp)
 819                         break;
 820
 821                 deps = tmp;
 822
 823                 memset(deps + count - 1, 0, sizeof(compound_depend_t));
 824                 parseDepends(deps + count - 1, item, type);
 825         }
 826
 827         if (!deps)
 828                 return;
 829
 830         memset(deps + count - 1, 0, sizeof(compound_depend_t));
 831         pkg_set_ptr(pkg, id, deps);
 832 }
 833
 834 void buildDepends(pkg_t * pkg)
 835 {
 836 #if 0
 837         unsigned int count;
 838         int i;
 839         compound_depend_t *depends;
 840
 841         if (!
 842             (count =
 843              pkg->pre_depends_count + pkg->depends_count +
 844              pkg->recommends_count + pkg->suggests_count))
 845                 return;
 846
 847         depends = pkg->depends = xcalloc(count, sizeof(compound_depend_t));
 848
 849         for (i = 0; i < pkg->pre_depends_count; i++) {
 850                 parseDepends(depends, pkg->pre_depends_str[i]);
 851                 free(pkg->pre_depends_str[i]);
 852                 depends->type = PREDEPEND;
 853                 depends++;
 854         }
 855         if (pkg->pre_depends_str)
 856                 free(pkg->pre_depends_str);
 857
 858         for (i = 0; i < pkg->depends_count; i++) {
 859                 parseDepends(depends, pkg->depends_str[i]);
 860                 free(pkg->depends_str[i]);
 861                 depends++;
 862         }
 863         if (pkg->depends_str)
 864                 free(pkg->depends_str);
 865
 866         for (i = 0; i < pkg->recommends_count; i++) {
 867                 parseDepends(depends, pkg->recommends_str[i]);
 868                 free(pkg->recommends_str[i]);
 869                 depends->type = RECOMMEND;
 870                 depends++;
 871         }
 872         if (pkg->recommends_str)
 873                 free(pkg->recommends_str);
 874
 875         for (i = 0; i < pkg->suggests_count; i++) {
 876                 parseDepends(depends, pkg->suggests_str[i]);
 877                 free(pkg->suggests_str[i]);
 878                 depends->type = SUGGEST;
 879                 depends++;
 880         }
 881         if (pkg->suggests_str)
 882                 free(pkg->suggests_str);
 883
 884 #endif
 885 }
 886
 887 const char *constraint_to_str(enum version_constraint c)
 888 {
 889         switch (c) {
 890         case NONE:
 891                 return "";
 892         case EARLIER:
 893                 return "< ";
 894         case EARLIER_EQUAL:
 895                 return "<= ";
 896         case EQUAL:
 897                 return "= ";
 898         case LATER_EQUAL:
 899                 return ">= ";
 900         case LATER:
 901                 return "> ";
 902         }
 903
 904         return "";
 905 }
 906
 907 /*
 908  * Returns a printable string for pkg's dependency at the specified idx. The
 909  * resultant string must be passed to free() by the caller.
 910  */
 911 char *pkg_depend_str(pkg_t * pkg, int idx)
 912 {
 913         int i;
 914         unsigned int len;
 915         char *str;
 916         compound_depend_t *cdep = NULL, *p;
 917         depend_t *dep;
 918
 919         for (i = 0, p = pkg_get_ptr(pkg, PKG_DEPENDS); p && p->type; i++, p++)
 920                 if (i == idx) {
 921                         cdep = p;
 922                         break;
 923                 }
 924
 925         if (!cdep)
 926                 return NULL;
 927
 928         len = 0;
 929
 930         /* calculate string length */
 931         for (i = 0; i < cdep->possibility_count; i++) {
 932                 dep = cdep->possibilities[i];
 933
 934                 if (i != 0)
 935                         len += 3;       /* space, pipe, space */
 936
 937                 len += strlen(dep->pkg->name);
 938
 939                 if (dep->version) {
 940                         len += 2;       /* space, left parenthesis */
 941                         len += 3;       /* constraint string (<=, >=, etc), space */
 942                         len += strlen(dep->version);
 943                         len += 1;       /* right parenthesis */
 944                 }
 945         }
 946
 947         str = xmalloc(len + 1); /* +1 for the NULL terminator */
 948         str[0] = '\0';
 949
 950         for (i = 0; i < cdep->possibility_count; i++) {
 951                 dep = cdep->possibilities[i];
 952
 953                 if (i != 0)
 954                         strncat(str, " | ", len);
 955
 956                 strncat(str, dep->pkg->name, len);
 957
 958                 if (dep->version) {
 959                         strncat(str, " (", len);
 960                         strncat(str, constraint_to_str(dep->constraint), len);
 961                         strncat(str, dep->version, len);
 962                         strncat(str, ")", len);
 963                 }
 964         }
 965
 966         return str;
 967 }
 968
 969 void buildDependedUponBy(pkg_t * pkg, abstract_pkg_t * ab_pkg)
 970 {
 971         compound_depend_t *depends;
 972         int othercount;
 973         int j;
 974         abstract_pkg_t *ab_depend;
 975         abstract_pkg_t **temp;
 976
 977         for (depends = pkg_get_ptr(pkg, PKG_DEPENDS); depends && depends->type; depends++) {
 978                 if (depends->type != PREDEPEND
 979                     && depends->type != DEPEND && depends->type != RECOMMEND)
 980                         continue;
 981                 for (j = 0; j < depends->possibility_count; j++) {
 982                         ab_depend = depends->possibilities[j]->pkg;
 983                         if (!ab_depend->depended_upon_by) {
 984                                 ab_depend->depended_upon_by =
 985                                     xcalloc(1, sizeof(abstract_pkg_t *));
 986                         }
 987
 988                         temp = ab_depend->depended_upon_by;
 989                         othercount = 1;
 990                         while (*temp) {
 991                                 temp++;
 992                                 othercount++;
 993                         }
 994                         *temp = ab_pkg;
 995
 996                         ab_depend->depended_upon_by =
 997                             xrealloc(ab_depend->depended_upon_by,
 998                                      (othercount +
 999                                       1) * sizeof(abstract_pkg_t *));
1000
1001                         /* the array may have been moved by realloc */
1002                         temp = ab_depend->depended_upon_by + othercount;
1003                         *temp = NULL;
1004                 }
1005         }
1006 }
1007
1008 static depend_t *depend_init(void)
1009 {
1010         depend_t *d = xcalloc(1, sizeof(depend_t));
1011         d->constraint = NONE;
1012         d->version = NULL;
1013         d->pkg = NULL;
1014
1015         return d;
1016 }
1017
1018 static int parseDepends(compound_depend_t * compound_depend, char *depend_str, enum depend_type type)
1019 {
1020         int i;
1021         char *depend, *name, *vstr, *rest, *tok = NULL;
1022         depend_t **possibilities = NULL, **tmp;
1023
1024         compound_depend->type = type;
1025
1026         for (i = 0, depend = strtok_r(depend_str, "|", &tok); depend; i++, depend = strtok_r(NULL, "|", &tok)) {
1027                 name = strtok(depend, " ");
1028                 rest = strtok(NULL, "\n");
1029
1030                 tmp = realloc(possibilities, sizeof(tmp) * (i + 1));
1031
1032                 if (!tmp)
1033                         return -1;
1034
1035                 possibilities = tmp;
1036                 possibilities[i] = depend_init();
1037                 possibilities[i]->pkg = ensure_abstract_pkg_by_name(name);
1038
1039                 if (rest && *rest == '(') {
1040                         vstr = strtok(rest + 1, ")");
1041
1042                         if (!strncmp(vstr, "<<", 2)) {
1043                                 possibilities[i]->constraint = EARLIER;
1044                                 vstr += 2;
1045                         } else if (!strncmp(vstr, "<=", 2)) {
1046                                 possibilities[i]->constraint = EARLIER_EQUAL;
1047                                 vstr += 2;
1048                         } else if (!strncmp(vstr, ">=", 2)) {
1049                                 possibilities[i]->constraint = LATER_EQUAL;
1050                                 vstr += 2;
1051                         } else if (!strncmp(vstr, ">>", 2)) {
1052                                 possibilities[i]->constraint = LATER;
1053                                 vstr += 2;
1054                         } else if (!strncmp(vstr, "=", 1)) {
1055                                 possibilities[i]->constraint = EQUAL;
1056                                 vstr++;
1057                         }
1058                         /* should these be here to support deprecated designations; dpkg does */
1059                         else if (!strncmp(vstr, "<", 1)) {
1060                                 possibilities[i]->constraint = EARLIER_EQUAL;
1061                                 vstr++;
1062                         } else if (!strncmp(vstr, ">", 1)) {
1063                                 possibilities[i]->constraint = LATER_EQUAL;
1064                                 vstr++;
1065                         }
1066
1067                         possibilities[i]->version = trim_xstrdup(vstr);
1068                         rest = strtok(NULL, " ");
1069                 }
1070                 else {
1071                         rest = strtok(rest, " ");
1072                 }
1073
1074                 if (rest && *rest == '*')
1075                         compound_depend->type = GREEDY_DEPEND;
1076         }
1077
1078         compound_depend->possibility_count = i;
1079         compound_depend->possibilities = possibilities;
1080
1081         return 0;
1082 }
1083
1084 compound_depend_t *pkg_get_depends(pkg_t *pkg, enum depend_type type)
1085 {
1086         compound_depend_t *dep;
1087
1088         for (dep = pkg_get_ptr(pkg, PKG_DEPENDS); dep && dep->type; dep++)
1089                 if (type == UNSPEC || dep->type == type)
1090                         return dep;
1091
1092         return NULL;
1093 }