archival/dpkg.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  mini dpkg implementation for busybox.
   4  *  this is not meant as a replacement for dpkg
   5  *
   6  *  written by glenn mcgrath with the help of others
   7  *  copyright (c) 2001 by glenn mcgrath
   8  *
   9  *  parts of the version comparison code is plucked from the real dpkg
  10  *  application which is licensed GPLv2 and
  11  *  copyright (c) 1995 Ian Jackson <ian@chiark.greenend.org.uk>
  12  *
  13  *  started life as a busybox implementation of udpkg
  14  *
  15  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  16  */
  17
  18 /*
  19  * known difference between busybox dpkg and the official dpkg that i don't
  20  * consider important, its worth keeping a note of differences anyway, just to
  21  * make it easier to maintain.
  22  *  - the first value for the confflile: field isnt placed on a new line.
  23  *  - when installing a package the status: field is placed at the end of the
  24  *      section, rather than just after the package: field.
  25  *
  26  * bugs that need to be fixed
  27  *  - (unknown, please let me know when you find any)
  28  *
  29  */
  30
  31 //usage:#define dpkg_trivial_usage
  32 //usage:       "[-ilCPru] [-F OPT] PACKAGE"
  33 //usage:#define dpkg_full_usage "\n\n"
  34 //usage:       "Install, remove and manage Debian packages\n"
  35 //usage:        IF_LONG_OPTS(
  36 //usage:     "\n        -i,--install    Install the package"
  37 //usage:     "\n        -l,--list       List of installed packages"
  38 //usage:     "\n        --configure     Configure an unpackaged package"
  39 //usage:     "\n        -P,--purge      Purge all files of a package"
  40 //usage:     "\n        -r,--remove     Remove all but the configuration files for a package"
  41 //usage:     "\n        --unpack        Unpack a package, but don't configure it"
  42 //usage:     "\n        --force-depends Ignore dependency problems"
  43 //usage:     "\n        --force-confnew Overwrite existing config files when installing"
  44 //usage:     "\n        --force-confold Keep old config files when installing"
  45 //usage:        )
  46 //usage:        IF_NOT_LONG_OPTS(
  47 //usage:     "\n        -i              Install the package"
  48 //usage:     "\n        -l              List of installed packages"
  49 //usage:     "\n        -C              Configure an unpackaged package"
  50 //usage:     "\n        -P              Purge all files of a package"
  51 //usage:     "\n        -r              Remove all but the configuration files for a package"
  52 //usage:     "\n        -u              Unpack a package, but don't configure it"
  53 //usage:     "\n        -F depends      Ignore dependency problems"
  54 //usage:     "\n        -F confnew      Overwrite existing config files when installing"
  55 //usage:     "\n        -F confold      Keep old config files when installing"
  56 //usage:        )
  57
  58 #include "libbb.h"
  59 #include <fnmatch.h>
  60 #include "bb_archive.h"
  61
  62 /* note: if you vary hash_prime sizes be aware,
  63  * 1) tweaking these will have a big effect on how much memory this program uses.
  64  * 2) for computational efficiency these hash tables should be at least 20%
  65  *    larger than the maximum number of elements stored in it.
  66  * 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
  67  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
  68  * 4) if you go bigger than 15 bits you may get into trouble (untested) as its
  69  *    sometimes cast to an unsigned, if you go to 16 bit you will overlap
  70  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
  71  */
  72
  73 /* NAME_HASH_PRIME, Stores package names and versions,
  74  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
  75  * as there a lot of duplicate version numbers */
  76 #define NAME_HASH_PRIME 16381
  77
  78 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
  79  * It must not be smaller than STATUS_HASH_PRIME,
  80  * Currently only packages from status_hashtable are stored in here, but in
  81  * future this may be used to store packages not only from a status file,
  82  * but an available_hashtable, and even multiple packages files.
  83  * Package can be stored more than once if they have different versions.
  84  * e.g. The same package may have different versions in the status file
  85  *      and available file */
  86 #define PACKAGE_HASH_PRIME 10007
  87 typedef struct edge_s {
  88         unsigned operator:4; /* was:3 */
  89         unsigned type:4;
  90         unsigned name:16; /* was:14 */
  91         unsigned version:16; /* was:14 */
  92 } edge_t;
  93
  94 typedef struct common_node_s {
  95         unsigned name:16; /* was:14 */
  96         unsigned version:16; /* was:14 */
  97         unsigned num_of_edges:16; /* was:14 */
  98         edge_t **edge;
  99 } common_node_t;
 100
 101 /* Currently it doesnt store packages that have state-status of not-installed
 102  * So it only really has to be the size of the maximum number of packages
 103  * likely to be installed at any one time, so there is a bit of leeway here */
 104 #define STATUS_HASH_PRIME 8191
 105 typedef struct status_node_s {
 106         unsigned package:16; /* was:14 */       /* has to fit PACKAGE_HASH_PRIME */
 107         unsigned status:16; /* was:14 */        /* has to fit STATUS_HASH_PRIME */
 108 } status_node_t;
 109
 110
 111 /* Globals */
 112 struct globals {
 113         char          *name_hashtable[NAME_HASH_PRIME + 1];
 114         common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
 115         status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
 116 };
 117 #define G (*ptr_to_globals)
 118 #define name_hashtable    (G.name_hashtable   )
 119 #define package_hashtable (G.package_hashtable)
 120 #define status_hashtable  (G.status_hashtable )
 121 #define INIT_G() do { \
 122         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 123 } while (0)
 124
 125
 126 /* Even numbers are for 'extras', like ored dependencies or null */
 127 enum edge_type_e {
 128         EDGE_NULL = 0,
 129         EDGE_PRE_DEPENDS = 1,
 130         EDGE_OR_PRE_DEPENDS = 2,
 131         EDGE_DEPENDS = 3,
 132         EDGE_OR_DEPENDS = 4,
 133         EDGE_REPLACES = 5,
 134         EDGE_PROVIDES = 7,
 135         EDGE_CONFLICTS = 9,
 136         EDGE_SUGGESTS = 11,
 137         EDGE_RECOMMENDS = 13,
 138         EDGE_ENHANCES = 15
 139 };
 140 enum operator_e {
 141         VER_NULL = 0,
 142         VER_EQUAL = 1,
 143         VER_LESS = 2,
 144         VER_LESS_EQUAL = 3,
 145         VER_MORE = 4,
 146         VER_MORE_EQUAL = 5,
 147         VER_ANY = 6
 148 };
 149
 150 typedef struct deb_file_s {
 151         char *control_file;
 152         char *filename;
 153         unsigned package:16; /* was:14 */
 154 } deb_file_t;
 155
 156
 157 static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
 158 {
 159         unsigned long hash_num = key[0];
 160         int len = strlen(key);
 161         int i;
 162
 163         /* Maybe i should have uses a "proper" hashing algorithm here instead
 164          * of making one up myself, seems to be working ok though. */
 165         for (i = 1; i < len; i++) {
 166                 /* shifts the ascii based value and adds it to previous value
 167                  * shift amount is mod 24 because long int is 32 bit and data
 168                  * to be shifted is 8, don't want to shift data to where it has
 169                  * no effect */
 170                 hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
 171         }
 172         *start = (unsigned) hash_num % hash_prime;
 173         *decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
 174 }
 175
 176 /* this adds the key to the hash table */
 177 static int search_name_hashtable(const char *key)
 178 {
 179         unsigned probe_address;
 180         unsigned probe_decrement;
 181
 182         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 183         while (name_hashtable[probe_address] != NULL) {
 184                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 185                         return probe_address;
 186                 }
 187                 probe_address -= probe_decrement;
 188                 if ((int)probe_address < 0) {
 189                         probe_address += NAME_HASH_PRIME;
 190                 }
 191         }
 192         name_hashtable[probe_address] = xstrdup(key);
 193         return probe_address;
 194 }
 195
 196 /* this DOESNT add the key to the hashtable
 197  * TODO make it consistent with search_name_hashtable
 198  */
 199 static unsigned search_status_hashtable(const char *key)
 200 {
 201         unsigned probe_address;
 202         unsigned probe_decrement;
 203
 204         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 205         while (status_hashtable[probe_address] != NULL) {
 206                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 207                         break;
 208                 }
 209                 probe_address -= probe_decrement;
 210                 if ((int)probe_address < 0) {
 211                         probe_address += STATUS_HASH_PRIME;
 212                 }
 213         }
 214         return probe_address;
 215 }
 216
 217 static int order(char x)
 218 {
 219         return (x == '~' ? -1
 220                 : x == '\0' ? 0
 221                 : isdigit(x) ? 0
 222                 : isalpha(x) ? x
 223                 : (unsigned char)x + 256
 224         );
 225 }
 226
 227 /* This code is taken from dpkg and modified slightly to work with busybox */
 228 static int version_compare_part(const char *val, const char *ref)
 229 {
 230         if (!val) val = "";
 231         if (!ref) ref = "";
 232
 233         while (*val || *ref) {
 234                 int first_diff;
 235
 236                 while ((*val && !isdigit(*val)) || (*ref && !isdigit(*ref))) {
 237                         int vc = order(*val);
 238                         int rc = order(*ref);
 239                         if (vc != rc)
 240                                 return vc - rc;
 241                         val++;
 242                         ref++;
 243                 }
 244
 245                 while (*val == '0')
 246                         val++;
 247                 while (*ref == '0')
 248                         ref++;
 249
 250                 first_diff = 0;
 251                 while (isdigit(*val) && isdigit(*ref)) {
 252                         if (first_diff == 0)
 253                                 first_diff = *val - *ref;
 254                         val++;
 255                         ref++;
 256                 }
 257                 if (isdigit(*val))
 258                         return 1;
 259                 if (isdigit(*ref))
 260                         return -1;
 261                 if (first_diff)
 262                         return first_diff;
 263         }
 264         return 0;
 265 }
 266
 267 /* if ver1 < ver2 return -1,
 268  * if ver1 = ver2 return 0,
 269  * if ver1 > ver2 return 1,
 270  */
 271 static int version_compare(const unsigned ver1, const unsigned ver2)
 272 {
 273         char *ch_ver1 = name_hashtable[ver1];
 274         char *ch_ver2 = name_hashtable[ver2];
 275         unsigned epoch1 = 0, epoch2 = 0;
 276         char *colon;
 277         char *deb_ver1, *deb_ver2;
 278         char *upstream_ver1;
 279         char *upstream_ver2;
 280         int result;
 281
 282         /* Compare epoch */
 283         colon = strchr(ch_ver1, ':');
 284         if (colon) {
 285                 epoch1 = atoi(ch_ver1);
 286                 ch_ver1 = colon + 1;
 287         }
 288         colon = strchr(ch_ver2, ':');
 289         if (colon) {
 290                 epoch2 = atoi(ch_ver2);
 291                 ch_ver2 = colon + 1;
 292         }
 293         if (epoch1 < epoch2) {
 294                 return -1;
 295         }
 296         if (epoch1 > epoch2) {
 297                 return 1;
 298         }
 299
 300         /* Compare upstream version */
 301         upstream_ver1 = xstrdup(ch_ver1);
 302         upstream_ver2 = xstrdup(ch_ver2);
 303
 304         /* Chop off debian version, and store for later use */
 305         deb_ver1 = strrchr(upstream_ver1, '-');
 306         deb_ver2 = strrchr(upstream_ver2, '-');
 307         if (deb_ver1) {
 308                 *deb_ver1++ = '\0';
 309         }
 310         if (deb_ver2) {
 311                 *deb_ver2++ = '\0';
 312         }
 313         result = version_compare_part(upstream_ver1, upstream_ver2);
 314         if (result == 0) {
 315                 /* Compare debian versions */
 316                 result = version_compare_part(deb_ver1, deb_ver2);
 317         }
 318
 319         free(upstream_ver1);
 320         free(upstream_ver2);
 321         return result;
 322 }
 323
 324 static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
 325 {
 326         const int version_result = version_compare(version1, version2);
 327         switch (operator) {
 328         case VER_ANY:
 329                 return TRUE;
 330         case VER_EQUAL:
 331                 return (version_result == 0);
 332         case VER_LESS:
 333                 return (version_result < 0);
 334         case VER_LESS_EQUAL:
 335                 return (version_result <= 0);
 336         case VER_MORE:
 337                 return (version_result > 0);
 338         case VER_MORE_EQUAL:
 339                 return (version_result >= 0);
 340         }
 341         return FALSE;
 342 }
 343
 344 static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
 345 {
 346         unsigned probe_address;
 347         unsigned probe_decrement;
 348
 349         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 350         while (package_hashtable[probe_address] != NULL) {
 351                 if (package_hashtable[probe_address]->name == name) {
 352                         if (operator == VER_ANY) {
 353                                 return probe_address;
 354                         }
 355                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 356                                 return probe_address;
 357                         }
 358                 }
 359                 probe_address -= probe_decrement;
 360                 if ((int)probe_address < 0) {
 361                         probe_address += PACKAGE_HASH_PRIME;
 362                 }
 363         }
 364         return probe_address;
 365 }
 366
 367 /*
 368  * This function searches through the entire package_hashtable looking
 369  * for a package which provides "needle". It returns the index into
 370  * the package_hashtable for the providing package.
 371  *
 372  * needle is the index into name_hashtable of the package we are
 373  * looking for.
 374  *
 375  * start_at is the index in the package_hashtable to start looking
 376  * at. If start_at is -1 then start at the beginning. This is to allow
 377  * for repeated searches since more than one package might provide
 378  * needle.
 379  *
 380  * FIXME: I don't think this is very efficient, but I thought I'd keep
 381  * it simple for now until it proves to be a problem.
 382  */
 383 static int search_for_provides(int needle, int start_at)
 384 {
 385         int i, j;
 386         common_node_t *p;
 387         for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
 388                 p = package_hashtable[i];
 389                 if (p == NULL)
 390                         continue;
 391                 for (j = 0; j < p->num_of_edges; j++)
 392                         if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
 393                                 return i;
 394         }
 395         return -1;
 396 }
 397
 398 /*
 399  * Add an edge to a node
 400  */
 401 static void add_edge_to_node(common_node_t *node, edge_t *edge)
 402 {
 403         node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
 404         node->edge[node->num_of_edges++] = edge;
 405 }
 406
 407 /*
 408  * Create one new node and one new edge for every dependency.
 409  *
 410  * Dependencies which contain multiple alternatives are represented as
 411  * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
 412  * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
 413  * the OR edge contains the full dependency string while the version
 414  * field contains the number of EDGE nodes which follow as part of
 415  * this alternative.
 416  */
 417 static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
 418 {
 419         char *line = xstrdup(whole_line);
 420         char *line2;
 421         char *line_ptr1 = NULL;
 422         char *line_ptr2 = NULL;
 423         char *field;
 424         char *field2;
 425         char *version;
 426         edge_t *edge;
 427         edge_t *or_edge;
 428         int offset_ch;
 429
 430         field = strtok_r(line, ",", &line_ptr1);
 431         do {
 432                 /* skip leading spaces */
 433                 field += strspn(field, " ");
 434                 line2 = xstrdup(field);
 435                 field2 = strtok_r(line2, "|", &line_ptr2);
 436                 or_edge = NULL;
 437                 if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
 438                  && (strcmp(field, field2) != 0)
 439                 ) {
 440                         or_edge = xzalloc(sizeof(edge_t));
 441                         or_edge->type = edge_type + 1;
 442                         or_edge->name = search_name_hashtable(field);
 443                         //or_edge->version = 0; // tracks the number of alternatives
 444                         add_edge_to_node(parent_node, or_edge);
 445                 }
 446
 447                 do {
 448                         edge = xmalloc(sizeof(edge_t));
 449                         edge->type = edge_type;
 450
 451                         /* Skip any extra leading spaces */
 452                         field2 += strspn(field2, " ");
 453
 454                         /* Get dependency version info */
 455                         version = strchr(field2, '(');
 456                         if (version == NULL) {
 457                                 edge->operator = VER_ANY;
 458                                 /* Get the versions hash number, adding it if the number isnt already in there */
 459                                 edge->version = search_name_hashtable("ANY");
 460                         } else {
 461                                 /* Skip leading ' ' or '(' */
 462                                 version += strspn(version, " (");
 463                                 /* Calculate length of any operator characters */
 464                                 offset_ch = strspn(version, "<=>");
 465                                 /* Determine operator */
 466                                 if (offset_ch > 0) {
 467                                         if (strncmp(version, "=", offset_ch) == 0) {
 468                                                 edge->operator = VER_EQUAL;
 469                                         } else if (strncmp(version, "<<", offset_ch) == 0) {
 470                                                 edge->operator = VER_LESS;
 471                                         } else if (strncmp(version, "<=", offset_ch) == 0) {
 472                                                 edge->operator = VER_LESS_EQUAL;
 473                                         } else if (strncmp(version, ">>", offset_ch) == 0) {
 474                                                 edge->operator = VER_MORE;
 475                                         } else if (strncmp(version, ">=", offset_ch) == 0) {
 476                                                 edge->operator = VER_MORE_EQUAL;
 477                                         } else {
 478                                                 bb_error_msg_and_die("illegal operator");
 479                                         }
 480                                 }
 481                                 /* skip to start of version numbers */
 482                                 version += offset_ch;
 483                                 version += strspn(version, " ");
 484
 485                                 /* Truncate version at trailing ' ' or ')' */
 486                                 version[strcspn(version, " )")] = '\0';
 487                                 /* Get the versions hash number, adding it if the number isnt already in there */
 488                                 edge->version = search_name_hashtable(version);
 489                         }
 490
 491                         /* Get the dependency name */
 492                         field2[strcspn(field2, " (")] = '\0';
 493                         edge->name = search_name_hashtable(field2);
 494
 495                         if (or_edge)
 496                                 or_edge->version++;
 497
 498                         add_edge_to_node(parent_node, edge);
 499                         field2 = strtok_r(NULL, "|", &line_ptr2);
 500                 } while (field2 != NULL);
 501
 502                 free(line2);
 503                 field = strtok_r(NULL, ",", &line_ptr1);
 504         } while (field != NULL);
 505
 506         free(line);
 507 }
 508
 509 static void free_package(common_node_t *node)
 510 {
 511         unsigned i;
 512         if (node) {
 513                 for (i = 0; i < node->num_of_edges; i++) {
 514                         free(node->edge[i]);
 515                 }
 516                 free(node->edge);
 517                 free(node);
 518         }
 519 }
 520
 521 /*
 522  * Gets the next package field from package_buffer, separated into the field name
 523  * and field value, it returns the int offset to the first character of the next field
 524  */
 525 static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
 526 {
 527         int offset_name_start = 0;
 528         int offset_name_end = 0;
 529         int offset_value_start = 0;
 530         int offset_value_end = 0;
 531         int offset = 0;
 532         int next_offset;
 533         int name_length;
 534         int value_length;
 535         int exit_flag = FALSE;
 536
 537         if (package_buffer == NULL) {
 538                 *field_name = NULL;
 539                 *field_value = NULL;
 540                 return -1;
 541         }
 542         while (1) {
 543                 next_offset = offset + 1;
 544                 switch (package_buffer[offset]) {
 545                         case '\0':
 546                                 exit_flag = TRUE;
 547                                 break;
 548                         case ':':
 549                                 if (offset_name_end == 0) {
 550                                         offset_name_end = offset;
 551                                         offset_value_start = next_offset;
 552                                 }
 553                                 /* TODO: Name might still have trailing spaces if ':' isnt
 554                                  * immediately after name */
 555                                 break;
 556                         case '\n':
 557                                 /* TODO: The char next_offset may be out of bounds */
 558                                 if (package_buffer[next_offset] != ' ') {
 559                                         exit_flag = TRUE;
 560                                         break;
 561                                 }
 562                         case '\t':
 563                         case ' ':
 564                                 /* increment the value start point if its a just filler */
 565                                 if (offset_name_start == offset) {
 566                                         offset_name_start++;
 567                                 }
 568                                 if (offset_value_start == offset) {
 569                                         offset_value_start++;
 570                                 }
 571                                 break;
 572                 }
 573                 if (exit_flag) {
 574                         /* Check that the names are valid */
 575                         offset_value_end = offset;
 576                         name_length = offset_name_end - offset_name_start;
 577                         value_length = offset_value_end - offset_value_start;
 578                         if (name_length == 0) {
 579                                 break;
 580                         }
 581                         if ((name_length > 0) && (value_length > 0)) {
 582                                 break;
 583                         }
 584
 585                         /* If not valid, start fresh with next field */
 586                         exit_flag = FALSE;
 587                         offset_name_start = offset + 1;
 588                         offset_name_end = 0;
 589                         offset_value_start = offset + 1;
 590                         offset_value_end = offset + 1;
 591                         offset++;
 592                 }
 593                 offset++;
 594         }
 595         *field_name = NULL;
 596         if (name_length) {
 597                 *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
 598         }
 599         *field_value = NULL;
 600         if (value_length > 0) {
 601                 *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
 602         }
 603         return next_offset;
 604 }
 605
 606 static unsigned fill_package_struct(char *control_buffer)
 607 {
 608         static const char field_names[] ALIGN1 =
 609                 "Package\0""Version\0"
 610                 "Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
 611                 "Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
 612
 613         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 614         char *field_name;
 615         char *field_value;
 616         int field_start = 0;
 617         int num = -1;
 618         int buffer_length = strlen(control_buffer);
 619
 620         new_node->version = search_name_hashtable("unknown");
 621         while (field_start < buffer_length) {
 622                 unsigned field_num;
 623
 624                 field_start += read_package_field(&control_buffer[field_start],
 625                                 &field_name, &field_value);
 626
 627                 if (field_name == NULL) {
 628                         goto fill_package_struct_cleanup;
 629                 }
 630
 631                 field_num = index_in_strings(field_names, field_name);
 632                 switch (field_num) {
 633                 case 0: /* Package */
 634                         new_node->name = search_name_hashtable(field_value);
 635                         break;
 636                 case 1: /* Version */
 637                         new_node->version = search_name_hashtable(field_value);
 638                         break;
 639                 case 2: /* Pre-Depends */
 640                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 641                         break;
 642                 case 3: /* Depends */
 643                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 644                         break;
 645                 case 4: /* Replaces */
 646                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 647                         break;
 648                 case 5: /* Provides */
 649                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 650                         break;
 651                 case 6: /* Conflicts */
 652                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 653                         break;
 654                 case 7: /* Suggests */
 655                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 656                         break;
 657                 case 8: /* Recommends */
 658                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 659                         break;
 660                 case 9: /* Enhances */
 661                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 662                         break;
 663                 }
 664  fill_package_struct_cleanup:
 665                 free(field_name);
 666                 free(field_value);
 667         }
 668
 669         if (new_node->version == search_name_hashtable("unknown")) {
 670                 free_package(new_node);
 671                 return -1;
 672         }
 673         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 674         free_package(package_hashtable[num]);
 675         package_hashtable[num] = new_node;
 676         return num;
 677 }
 678
 679 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 680 static unsigned get_status(const unsigned status_node, const int num)
 681 {
 682         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 683         char *state_sub_string;
 684         unsigned state_sub_num;
 685         int len;
 686         int i;
 687
 688         /* set tmp_string to point to the start of the word number */
 689         for (i = 1; i < num; i++) {
 690                 /* skip past a word */
 691                 status_string += strcspn(status_string, " ");
 692                 /* skip past the separating spaces */
 693                 status_string += strspn(status_string, " ");
 694         }
 695         len = strcspn(status_string, " \n");
 696         state_sub_string = xstrndup(status_string, len);
 697         state_sub_num = search_name_hashtable(state_sub_string);
 698         free(state_sub_string);
 699         return state_sub_num;
 700 }
 701
 702 static void set_status(const unsigned status_node_num, const char *new_value, const int position)
 703 {
 704         const unsigned new_value_num = search_name_hashtable(new_value);
 705         unsigned want = get_status(status_node_num, 1);
 706         unsigned flag = get_status(status_node_num, 2);
 707         unsigned status = get_status(status_node_num, 3);
 708         char *new_status;
 709
 710         switch (position) {
 711                 case 1:
 712                         want = new_value_num;
 713                         break;
 714                 case 2:
 715                         flag = new_value_num;
 716                         break;
 717                 case 3:
 718                         status = new_value_num;
 719                         break;
 720                 default:
 721                         bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 722         }
 723
 724         new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 725         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 726         free(new_status);
 727 }
 728
 729 static const char *describe_status(int status_num)
 730 {
 731         int status_want, status_state;
 732         if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
 733                 return "is not installed or flagged to be installed";
 734
 735         status_want = get_status(status_num, 1);
 736         status_state = get_status(status_num, 3);
 737
 738         if (status_state == search_name_hashtable("installed")) {
 739                 if (status_want == search_name_hashtable("install"))
 740                         return "is installed";
 741                 if (status_want == search_name_hashtable("deinstall"))
 742                         return "is marked to be removed";
 743                 if (status_want == search_name_hashtable("purge"))
 744                         return "is marked to be purged";
 745         }
 746         if (status_want == search_name_hashtable("unknown"))
 747                 return "is in an indeterminate state";
 748         if (status_want == search_name_hashtable("install"))
 749                 return "is marked to be installed";
 750
 751         return "is not installed or flagged to be installed";
 752 }
 753
 754 static void index_status_file(const char *filename)
 755 {
 756         FILE *status_file;
 757         char *control_buffer;
 758         char *status_line;
 759         status_node_t *status_node = NULL;
 760         unsigned status_num;
 761
 762         status_file = xfopen_for_read(filename);
 763         while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
 764                 const unsigned package_num = fill_package_struct(control_buffer);
 765                 if (package_num != -1) {
 766                         status_node = xmalloc(sizeof(status_node_t));
 767                         /* fill_package_struct doesnt handle the status field */
 768                         status_line = strstr(control_buffer, "Status:");
 769                         if (status_line != NULL) {
 770                                 status_line += 7;
 771                                 status_line += strspn(status_line, " \n\t");
 772                                 status_line = xstrndup(status_line, strcspn(status_line, "\n"));
 773                                 status_node->status = search_name_hashtable(status_line);
 774                                 free(status_line);
 775                         }
 776                         status_node->package = package_num;
 777                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 778                         status_hashtable[status_num] = status_node;
 779                 }
 780                 free(control_buffer);
 781         }
 782         fclose(status_file);
 783 }
 784
 785 static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 786 {
 787         char *name;
 788         char *value;
 789         int start = 0;
 790         while (1) {
 791                 start += read_package_field(&control_buffer[start], &name, &value);
 792                 if (name == NULL) {
 793                         break;
 794                 }
 795                 if (strcmp(name, "Status") != 0) {
 796                         fprintf(new_status_file, "%s: %s\n", name, value);
 797                 }
 798         }
 799 }
 800
 801 /* This could do with a cleanup */
 802 static void write_status_file(deb_file_t **deb_file)
 803 {
 804         FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
 805         FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
 806         char *package_name;
 807         char *status_from_file;
 808         char *control_buffer = NULL;
 809         char *tmp_string;
 810         int status_num;
 811         int field_start = 0;
 812         int write_flag;
 813         int i = 0;
 814
 815         /* Update previously known packages */
 816         while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
 817                 tmp_string = strstr(control_buffer, "Package:");
 818                 if (tmp_string == NULL) {
 819                         continue;
 820                 }
 821
 822                 tmp_string += 8;
 823                 tmp_string += strspn(tmp_string, " \n\t");
 824                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 825                 write_flag = FALSE;
 826                 tmp_string = strstr(control_buffer, "Status:");
 827                 if (tmp_string != NULL) {
 828                         /* Separate the status value from the control buffer */
 829                         tmp_string += 7;
 830                         tmp_string += strspn(tmp_string, " \n\t");
 831                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 832                 } else {
 833                         status_from_file = NULL;
 834                 }
 835
 836                 /* Find this package in the status hashtable */
 837                 status_num = search_status_hashtable(package_name);
 838                 if (status_hashtable[status_num] != NULL) {
 839                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 840                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 841                                 /* New status isnt exactly the same as old status */
 842                                 const int state_status = get_status(status_num, 3);
 843                                 if ((strcmp("installed", name_hashtable[state_status]) == 0)
 844                                  || (strcmp("unpacked", name_hashtable[state_status]) == 0)
 845                                 ) {
 846                                         /* We need to add the control file from the package */
 847                                         i = 0;
 848                                         while (deb_file[i] != NULL) {
 849                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 850                                                         /* Write a status file entry with a modified status */
 851                                                         /* remove trailing \n's */
 852                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 853                                                         set_status(status_num, "ok", 2);
 854                                                         fprintf(new_status_file, "Status: %s\n\n",
 855                                                                         name_hashtable[status_hashtable[status_num]->status]);
 856                                                         write_flag = TRUE;
 857                                                         break;
 858                                                 }
 859                                                 i++;
 860                                         }
 861                                         /* This is temperary, debugging only */
 862                                         if (deb_file[i] == NULL) {
 863                                                 bb_error_msg_and_die("ALERT: cannot find a control file, "
 864                                                         "your status file may be broken, status may be "
 865                                                         "incorrect for %s", package_name);
 866                                         }
 867                                 }
 868                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 869                                         /* Only write the Package, Status, Priority and Section lines */
 870                                         fprintf(new_status_file, "Package: %s\n", package_name);
 871                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 872
 873                                         while (1) {
 874                                                 char *field_name;
 875                                                 char *field_value;
 876                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 877                                                 if (field_name == NULL) {
 878                                                         break;
 879                                                 }
 880                                                 if ((strcmp(field_name, "Priority") == 0)
 881                                                  || (strcmp(field_name, "Section") == 0)
 882                                                 ) {
 883                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 884                                                 }
 885                                         }
 886                                         write_flag = TRUE;
 887                                         fputs("\n", new_status_file);
 888                                 }
 889                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 890                                         /* only change the status line */
 891                                         while (1) {
 892                                                 char *field_name;
 893                                                 char *field_value;
 894                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 895                                                 if (field_name == NULL) {
 896                                                         break;
 897                                                 }
 898                                                 /* Setup start point for next field */
 899                                                 if (strcmp(field_name, "Status") == 0) {
 900                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 901                                                 } else {
 902                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 903                                                 }
 904                                         }
 905                                         write_flag = TRUE;
 906                                         fputs("\n", new_status_file);
 907                                 }
 908                         }
 909                 }
 910                 /* If the package from the status file wasnt handle above, do it now*/
 911                 if (!write_flag) {
 912                         fprintf(new_status_file, "%s\n\n", control_buffer);
 913                 }
 914
 915                 free(status_from_file);
 916                 free(package_name);
 917                 free(control_buffer);
 918         }
 919
 920         /* Write any new packages */
 921         for (i = 0; deb_file[i] != NULL; i++) {
 922                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 923                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 924                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 925                         set_status(status_num, "ok", 2);
 926                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 927                 }
 928         }
 929         fclose(old_status_file);
 930         fclose(new_status_file);
 931
 932         /* Create a separate backfile to dpkg */
 933         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 934                 if (errno != ENOENT)
 935                         bb_error_msg_and_die("can't create backup status file");
 936                 /* Its ok if renaming the status file fails because status
 937                  * file doesnt exist, maybe we are starting from scratch */
 938                 bb_error_msg("no status file found, creating new one");
 939         }
 940
 941         xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
 942 }
 943
 944 /* This function returns TRUE if the given package can satisfy a
 945  * dependency of type depend_type.
 946  *
 947  * A pre-depends is satisfied only if a package is already installed,
 948  * which a regular depends can be satisfied by a package which we want
 949  * to install.
 950  */
 951 static int package_satisfies_dependency(int package, int depend_type)
 952 {
 953         int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
 954
 955         /* status could be unknown if package is a pure virtual
 956          * provides which cannot satisfy any dependency by itself.
 957          */
 958         if (status_hashtable[status_num] == NULL)
 959                 return 0;
 960
 961         switch (depend_type) {
 962         case EDGE_PRE_DEPENDS: return get_status(status_num, 3) == search_name_hashtable("installed");
 963         case EDGE_DEPENDS:     return get_status(status_num, 1) == search_name_hashtable("install");
 964         }
 965         return 0;
 966 }
 967
 968 static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
 969 {
 970         int *conflicts = NULL;
 971         int conflicts_num = 0;
 972         int i = deb_start;
 973         int j;
 974
 975         /* Check for conflicts
 976          * TODO: TEST if conflicts with other packages to be installed
 977          *
 978          * Add install packages and the packages they provide
 979          * to the list of files to check conflicts for
 980          */
 981
 982         /* Create array of package numbers to check against
 983          * installed package for conflicts*/
 984         while (deb_file[i] != NULL) {
 985                 const unsigned package_num = deb_file[i]->package;
 986                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
 987                 conflicts[conflicts_num] = package_num;
 988                 conflicts_num++;
 989                 /* add provides to conflicts list */
 990                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
 991                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
 992                                 const int conflicts_package_num = search_package_hashtable(
 993                                         package_hashtable[package_num]->edge[j]->name,
 994                                         package_hashtable[package_num]->edge[j]->version,
 995                                         package_hashtable[package_num]->edge[j]->operator);
 996                                 if (package_hashtable[conflicts_package_num] == NULL) {
 997                                         /* create a new package */
 998                                         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 999                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
1000                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
1001                                         package_hashtable[conflicts_package_num] = new_node;
1002                                 }
1003                                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
1004                                 conflicts[conflicts_num] = conflicts_package_num;
1005                                 conflicts_num++;
1006                         }
1007                 }
1008                 i++;
1009         }
1010
1011         /* Check conflicts */
1012         i = 0;
1013         while (deb_file[i] != NULL) {
1014                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
1015                 int status_num = 0;
1016                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1017
1018                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1019                         i++;
1020                         continue;
1021                 }
1022
1023                 for (j = 0; j < package_node->num_of_edges; j++) {
1024                         const edge_t *package_edge = package_node->edge[j];
1025
1026                         if (package_edge->type == EDGE_CONFLICTS) {
1027                                 const unsigned package_num =
1028                                         search_package_hashtable(package_edge->name,
1029                                                                 package_edge->version,
1030                                                                 package_edge->operator);
1031                                 int result = 0;
1032                                 if (package_hashtable[package_num] != NULL) {
1033                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1034
1035                                         if (get_status(status_num, 1) == search_name_hashtable("install")) {
1036                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
1037                                                         package_edge->version, package_edge->operator);
1038                                         }
1039                                 }
1040
1041                                 if (result) {
1042                                         bb_error_msg_and_die("package %s conflicts with %s",
1043                                                 name_hashtable[package_node->name],
1044                                                 name_hashtable[package_edge->name]);
1045                                 }
1046                         }
1047                 }
1048                 i++;
1049         }
1050
1051
1052         /* Check dependendcies */
1053         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1054                 int status_num = 0;
1055                 int number_of_alternatives = 0;
1056                 const edge_t * root_of_alternatives = NULL;
1057                 const common_node_t *package_node = package_hashtable[i];
1058
1059                 /* If the package node does not exist then this
1060                  * package is a virtual one. In which case there are
1061                  * no dependencies to check.
1062                  */
1063                 if (package_node == NULL) continue;
1064
1065                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1066
1067                 /* If there is no status then this package is a
1068                  * virtual one provided by something else. In which
1069                  * case there are no dependencies to check.
1070                  */
1071                 if (status_hashtable[status_num] == NULL) continue;
1072
1073                 /* If we don't want this package installed then we may
1074                  * as well ignore it's dependencies.
1075                  */
1076                 if (get_status(status_num, 1) != search_name_hashtable("install")) {
1077                         continue;
1078                 }
1079
1080                 /* This code is tested only for EDGE_DEPENDS, since I
1081                  * have no suitable pre-depends available. There is no
1082                  * reason that it shouldn't work though :-)
1083                  */
1084                 for (j = 0; j < package_node->num_of_edges; j++) {
1085                         const edge_t *package_edge = package_node->edge[j];
1086                         unsigned package_num;
1087
1088                         if (package_edge->type == EDGE_OR_PRE_DEPENDS
1089                          || package_edge->type == EDGE_OR_DEPENDS
1090                         ) {
1091                                 /* start an EDGE_OR_ list */
1092                                 number_of_alternatives = package_edge->version;
1093                                 root_of_alternatives = package_edge;
1094                                 continue;
1095                         }
1096                         if (number_of_alternatives == 0) {  /* not in the middle of an EDGE_OR_ list */
1097                                 number_of_alternatives = 1;
1098                                 root_of_alternatives = NULL;
1099                         }
1100
1101                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1102
1103                         if (package_edge->type == EDGE_PRE_DEPENDS
1104                          || package_edge->type == EDGE_DEPENDS
1105                         ) {
1106                                 int result=1;
1107                                 status_num = 0;
1108
1109                                 /* If we are inside an alternative then check
1110                                  * this edge is the right type.
1111                                  *
1112                                  * EDGE_DEPENDS == OR_DEPENDS -1
1113                                  * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1114                                  */
1115                                 if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1116                                         bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1117                                                         package_edge->type, root_of_alternatives->type);
1118
1119                                 if (package_hashtable[package_num] != NULL)
1120                                         result = !package_satisfies_dependency(package_num, package_edge->type);
1121
1122                                 if (result) { /* check for other package which provide what we are looking for */
1123                                         int provider = -1;
1124
1125                                         while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1126                                                 if (package_hashtable[provider] == NULL) {
1127                                                         puts("Have a provider but no package information for it");
1128                                                         continue;
1129                                                 }
1130                                                 result = !package_satisfies_dependency(provider, package_edge->type);
1131
1132                                                 if (result == 0)
1133                                                         break;
1134                                         }
1135                                 }
1136
1137                                 /* It must be already installed, or to be installed */
1138                                 number_of_alternatives--;
1139                                 if (result && number_of_alternatives == 0) {
1140                                         if (root_of_alternatives)
1141                                                 bb_error_msg_and_die(
1142                                                         "package %s %sdepends on %s, "
1143                                                         "which cannot be satisfied",
1144                                                         name_hashtable[package_node->name],
1145                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1146                                                         name_hashtable[root_of_alternatives->name]);
1147                                         bb_error_msg_and_die(
1148                                                 "package %s %sdepends on %s, which %s\n",
1149                                                 name_hashtable[package_node->name],
1150                                                 package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1151                                                 name_hashtable[package_edge->name],
1152                                                 describe_status(status_num));
1153                                 }
1154                                 if (result == 0 && number_of_alternatives) {
1155                                         /* we've found a package which
1156                                          * satisfies the dependency,
1157                                          * so skip over the rest of
1158                                          * the alternatives.
1159                                          */
1160                                         j += number_of_alternatives;
1161                                         number_of_alternatives = 0;
1162                                 }
1163                         }
1164                 }
1165         }
1166         free(conflicts);
1167         return TRUE;
1168 }
1169
1170 static char **create_list(const char *filename)
1171 {
1172         FILE *list_stream;
1173         char **file_list;
1174         char *line;
1175         int count;
1176
1177         /* don't use [xw]fopen here, handle error ourself */
1178         list_stream = fopen_for_read(filename);
1179         if (list_stream == NULL) {
1180                 return NULL;
1181         }
1182
1183         file_list = NULL;
1184         count = 0;
1185         while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1186                 file_list = xrealloc_vector(file_list, 2, count);
1187                 file_list[count++] = line;
1188                 /*file_list[count] = NULL; - xrealloc_vector did it */
1189         }
1190         fclose(list_stream);
1191
1192         return file_list;
1193 }
1194
1195 /* maybe i should try and hook this into remove_file.c somehow */
1196 static int remove_file_array(char **remove_names, char **exclude_names)
1197 {
1198         struct stat path_stat;
1199         int remove_flag = 1; /* not removed anything yet */
1200         int i, j;
1201
1202         if (remove_names == NULL) {
1203                 return 0;
1204         }
1205         for (i = 0; remove_names[i] != NULL; i++) {
1206                 if (exclude_names != NULL) {
1207                         for (j = 0; exclude_names[j] != NULL; j++) {
1208                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1209                                         goto skip;
1210                                 }
1211                         }
1212                 }
1213                 /* TODO: why we are checking lstat? we can just try rm/rmdir */
1214                 if (lstat(remove_names[i], &path_stat) < 0) {
1215                         continue;
1216                 }
1217                 if (S_ISDIR(path_stat.st_mode)) {
1218                         remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1219                 } else {
1220                         remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1221                 }
1222  skip:
1223                 continue;
1224         }
1225         return (remove_flag == 0);
1226 }
1227
1228 static void run_package_script_or_die(const char *package_name, const char *script_type)
1229 {
1230         char *script_path;
1231         int result;
1232
1233         script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1234
1235         /* If the file doesnt exist is isnt fatal */
1236         result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1237         free(script_path);
1238         if (result)
1239                 bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1240 }
1241
1242 /*
1243 The policy manual defines what scripts get called when and with
1244 what arguments. I realize that busybox does not support all of
1245 these scenarios, but it does support some of them; it does not,
1246 however, run them with any parameters in run_package_script_or_die().
1247 Here are the scripts:
1248
1249 preinst install
1250 preinst install <old_version>
1251 preinst upgrade <old_version>
1252 preinst abort_upgrade <new_version>
1253 postinst configure <most_recent_version>
1254 postinst abort-upgade <new_version>
1255 postinst abort-remove
1256 postinst abort-remove in-favour <package> <version>
1257 postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1258 prerm remove
1259 prerm upgrade <new_version>
1260 prerm failed-upgrade <old_version>
1261 prerm remove in-favor <package> <new_version>
1262 prerm deconfigure in-favour <package> <version> removing <package> <version>
1263 postrm remove
1264 postrm purge
1265 postrm upgrade <new_version>
1266 postrm failed-upgrade <old_version>
1267 postrm abort-install
1268 postrm abort-install <old_version>
1269 postrm abort-upgrade <old_version>
1270 postrm disappear <overwriter> <version>
1271 */
1272 static const char *const all_control_files[] = {
1273         "preinst", "postinst", "prerm", "postrm",
1274         "list", "md5sums", "shlibs", "conffiles",
1275         "config", "templates"
1276 };
1277
1278 static char **all_control_list(const char *package_name)
1279 {
1280         unsigned i = 0;
1281         char **remove_files;
1282
1283         /* Create a list of all /var/lib/dpkg/info/<package> files */
1284         remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1285         while (i < ARRAY_SIZE(all_control_files)) {
1286                 remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1287                                 package_name, all_control_files[i]);
1288                 i++;
1289         }
1290
1291         return remove_files;
1292 }
1293
1294 static void free_array(char **array)
1295 {
1296         if (array) {
1297                 unsigned i = 0;
1298                 while (array[i]) {
1299                         free(array[i]);
1300                         i++;
1301                 }
1302                 free(array);
1303         }
1304 }
1305
1306 /* This function lists information on the installed packages. It loops through
1307  * the status_hashtable to retrieve the info. This results in smaller code than
1308  * scanning the status file. The resulting list, however, is unsorted.
1309  */
1310 static void list_packages(const char *pattern)
1311 {
1312         int i;
1313
1314         puts("    Name           Version");
1315         puts("+++-==============-==============");
1316
1317         /* go through status hash, dereference package hash and finally strings */
1318         for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1319                 if (status_hashtable[i]) {
1320                         const char *stat_str;  /* status string */
1321                         const char *name_str;  /* package name */
1322                         const char *vers_str;  /* version */
1323                         char  s1, s2;          /* status abbreviations */
1324                         int   spccnt;          /* space count */
1325                         int   j;
1326
1327                         stat_str = name_hashtable[status_hashtable[i]->status];
1328                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1329                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1330
1331                         if (pattern && fnmatch(pattern, name_str, 0) != 0)
1332                                 continue;
1333
1334                         /* get abbreviation for status field 1 */
1335                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1336
1337                         /* get abbreviation for status field 2 */
1338                         for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1339                                 if (stat_str[j] == ' ') spccnt++;
1340                         }
1341                         s2 = stat_str[j];
1342
1343                         /* print out the line formatted like Debian dpkg */
1344                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1345                 }
1346         }
1347 }
1348
1349 static void remove_package(const unsigned package_num, int noisy)
1350 {
1351         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1352         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1353         const unsigned status_num = search_status_hashtable(package_name);
1354         const int package_name_length = strlen(package_name);
1355         char **remove_files;
1356         char **exclude_files;
1357         char list_name[package_name_length + 25];
1358         char conffile_name[package_name_length + 30];
1359
1360         if (noisy)
1361                 printf("Removing %s (%s)...\n", package_name, package_version);
1362
1363         /* Run prerm script */
1364         run_package_script_or_die(package_name, "prerm");
1365
1366         /* Create a list of files to remove, and a separate list of those to keep */
1367         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1368         remove_files = create_list(list_name);
1369
1370         sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1371         exclude_files = create_list(conffile_name);
1372
1373         /* Some directories can't be removed straight away, so do multiple passes */
1374         while (remove_file_array(remove_files, exclude_files))
1375                 continue;
1376         free_array(exclude_files);
1377         free_array(remove_files);
1378
1379         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
1380         exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
1381         exclude_files[0] = xstrdup(conffile_name);
1382         exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1383
1384         /* Create a list of all /var/lib/dpkg/info/<package> files */
1385         remove_files = all_control_list(package_name);
1386
1387         remove_file_array(remove_files, exclude_files);
1388         free_array(remove_files);
1389         free_array(exclude_files);
1390
1391         /* rename <package>.conffiles to <package>.list
1392          * The conffiles control file isn't required in Debian packages, so don't
1393          * error out if it's missing.  */
1394         rename(conffile_name, list_name);
1395
1396         /* Change package status */
1397         set_status(status_num, "config-files", 3);
1398 }
1399
1400 static void purge_package(const unsigned package_num)
1401 {
1402         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1403         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1404         const unsigned status_num = search_status_hashtable(package_name);
1405         char **remove_files;
1406         char **exclude_files;
1407         char list_name[strlen(package_name) + 25];
1408
1409         printf("Purging %s (%s)...\n", package_name, package_version);
1410
1411         /* Run prerm script */
1412         run_package_script_or_die(package_name, "prerm");
1413
1414         /* Create a list of files to remove */
1415         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1416         remove_files = create_list(list_name);
1417
1418         /* Some directories cant be removed straight away, so do multiple passes */
1419         while (remove_file_array(remove_files, NULL))
1420                 continue;
1421         free_array(remove_files);
1422
1423         /* Create a list of all /var/lib/dpkg/info/<package> files */
1424         remove_files = all_control_list(package_name);
1425
1426         /* Delete all of them except the postrm script */
1427         exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
1428         exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1429         remove_file_array(remove_files, exclude_files);
1430         free_array(exclude_files);
1431
1432         /* Run and remove postrm script */
1433         run_package_script_or_die(package_name, "postrm");
1434         remove_file_array(remove_files, NULL);
1435
1436         free_array(remove_files);
1437
1438         /* Change package status */
1439         set_status(status_num, "not-installed", 3);
1440 }
1441
1442 static archive_handle_t *init_archive_deb_ar(const char *filename)
1443 {
1444         archive_handle_t *ar_handle;
1445
1446         /* Setup an ar archive handle that refers to the gzip sub archive */
1447         ar_handle = init_handle();
1448         ar_handle->filter = filter_accept_list_reassign;
1449         ar_handle->src_fd = xopen(filename, O_RDONLY);
1450
1451         return ar_handle;
1452 }
1453
1454 static void init_archive_deb_control(archive_handle_t *ar_handle)
1455 {
1456         archive_handle_t *tar_handle;
1457
1458         /* Setup the tar archive handle */
1459         tar_handle = init_handle();
1460         tar_handle->src_fd = ar_handle->src_fd;
1461
1462         /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1463 #if ENABLE_FEATURE_SEAMLESS_GZ
1464         llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1465 #endif
1466 #if ENABLE_FEATURE_SEAMLESS_BZ2
1467         llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1468 #endif
1469
1470         /* Assign the tar handle as a subarchive of the ar handle */
1471         ar_handle->dpkg__sub_archive = tar_handle;
1472 }
1473
1474 static void init_archive_deb_data(archive_handle_t *ar_handle)
1475 {
1476         archive_handle_t *tar_handle;
1477
1478         /* Setup the tar archive handle */
1479         tar_handle = init_handle();
1480         tar_handle->src_fd = ar_handle->src_fd;
1481
1482         /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1483 #if ENABLE_FEATURE_SEAMLESS_GZ
1484         llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1485 #endif
1486 #if ENABLE_FEATURE_SEAMLESS_BZ2
1487         llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1488 #endif
1489
1490         /* Assign the tar handle as a subarchive of the ar handle */
1491         ar_handle->dpkg__sub_archive = tar_handle;
1492 }
1493
1494 static void FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
1495 {
1496         unsigned size = archive_handle->file_header->size;
1497
1498         archive_handle->dpkg__buffer = xzalloc(size + 1);
1499         xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
1500 }
1501
1502 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1503 {
1504         ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
1505         ar_handle->dpkg__sub_archive->accept = myaccept;
1506         ar_handle->dpkg__sub_archive->filter = filter_accept_list;
1507
1508         unpack_ar_archive(ar_handle);
1509         close(ar_handle->src_fd);
1510
1511         return ar_handle->dpkg__sub_archive->dpkg__buffer;
1512 }
1513
1514 static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
1515 {
1516         FILE *fp;
1517         char *filename, *line;
1518
1519         filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
1520         fp = fopen_for_read(filename);
1521         free(filename);
1522         if (fp != NULL) {
1523                 while ((line = xmalloc_fgetline(fp)) != NULL)
1524                         llist_add_to(ll, line);
1525                 fclose(fp);
1526         }
1527 }
1528
1529 static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
1530 {
1531         int fd;
1532         char *name_ptr = archive_handle->file_header->name + 1;
1533
1534         /* Is this file marked as config file? */
1535         if (!find_list_entry(archive_handle->accept, name_ptr))
1536                 return EXIT_SUCCESS; /* no */
1537
1538         fd = open(name_ptr, O_RDONLY);
1539         if (fd >= 0) {
1540                 md5_ctx_t md5;
1541                 char *md5line, *buf;
1542                 int count;
1543
1544                 /* Calculate MD5 of existing file */
1545                 buf = xmalloc(4096);
1546                 md5_begin(&md5);
1547                 while ((count = safe_read(fd, buf, 4096)) > 0)
1548                         md5_hash(&md5, buf, count);
1549                 md5_end(&md5, buf); /* using buf as result storage */
1550                 close(fd);
1551
1552                 md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
1553                 sprintf(bin2hex(md5line, buf, 16), "  %s", name_ptr);
1554                 free(buf);
1555
1556                 /* Is it changed after install? */
1557                 if (find_list_entry(archive_handle->accept, md5line) == NULL) {
1558                         printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
1559                         archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
1560                 }
1561                 free(md5line);
1562         }
1563         return EXIT_SUCCESS;
1564 }
1565
1566 static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1567 {
1568         char *name_ptr = archive_handle->file_header->name;
1569
1570         /* Skip all leading "/" */
1571         while (*name_ptr == '/')
1572                 name_ptr++;
1573         /* Skip all leading "./" and "../" */
1574         while (name_ptr[0] == '.') {
1575                 if (name_ptr[1] == '.')
1576                         name_ptr++;
1577                 if (name_ptr[1] != '/')
1578                         break;
1579                 name_ptr += 2;
1580         }
1581
1582         if (name_ptr[0] != '\0') {
1583                 archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
1584                 data_extract_all(archive_handle);
1585                 if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
1586                         /* remove .dpkg-new suffix */
1587                         archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
1588                 }
1589         }
1590 }
1591
1592 enum {
1593         /* Commands */
1594         OPT_configure            = (1 << 0),
1595         OPT_install              = (1 << 1),
1596         OPT_list_installed       = (1 << 2),
1597         OPT_purge                = (1 << 3),
1598         OPT_remove               = (1 << 4),
1599         OPT_unpack               = (1 << 5),
1600         OPTMASK_cmd              = (1 << 6) - 1,
1601         /* Options */
1602         OPT_force                = (1 << 6),
1603         OPT_force_ignore_depends = (1 << 7),
1604         OPT_force_confnew        = (1 << 8),
1605         OPT_force_confold        = (1 << 9),
1606 };
1607
1608 static void unpack_package(deb_file_t *deb_file)
1609 {
1610         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1611         const unsigned status_num = search_status_hashtable(package_name);
1612         const unsigned status_package_num = status_hashtable[status_num]->package;
1613         char *info_prefix;
1614         char *list_filename;
1615         archive_handle_t *archive_handle;
1616         FILE *out_stream;
1617         llist_t *accept_list;
1618         llist_t *conffile_list;
1619         int i;
1620
1621         /* If existing version, remove it first */
1622         conffile_list = NULL;
1623         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1624                 /* Package is already installed, remove old version first */
1625                 printf("Preparing to replace %s %s (using %s)...\n", package_name,
1626                         name_hashtable[package_hashtable[status_package_num]->version],
1627                         deb_file->filename);
1628
1629                 /* Read md5sums from old package */
1630                 if (!(option_mask32 & OPT_force_confold))
1631                         append_control_file_to_llist(package_name, "md5sums", &conffile_list);
1632
1633                 remove_package(status_package_num, 0);
1634         } else {
1635                 printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1636         }
1637
1638         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1639         info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1640         archive_handle = init_archive_deb_ar(deb_file->filename);
1641         init_archive_deb_control(archive_handle);
1642
1643         accept_list = NULL;
1644         i = 0;
1645         while (i < ARRAY_SIZE(all_control_files)) {
1646                 char *c = xasprintf("./%s", all_control_files[i]);
1647                 llist_add_to(&accept_list, c);
1648                 i++;
1649         }
1650         archive_handle->dpkg__sub_archive->accept = accept_list;
1651         archive_handle->dpkg__sub_archive->filter = filter_accept_list;
1652         archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1653         archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
1654         archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1655         unpack_ar_archive(archive_handle);
1656
1657         /* Run the preinst prior to extracting */
1658         run_package_script_or_die(package_name, "preinst");
1659
1660         /* Don't overwrite existing config files */
1661         if (!(option_mask32 & OPT_force_confnew))
1662                 append_control_file_to_llist(package_name, "conffiles", &conffile_list);
1663
1664         /* Extract data.tar.gz to the root directory */
1665         archive_handle = init_archive_deb_ar(deb_file->filename);
1666         init_archive_deb_data(archive_handle);
1667         archive_handle->dpkg__sub_archive->accept = conffile_list;
1668         /* Why ARCHIVE_REMEMBER_NAMES?
1669          * We want names collected in ->passed list even if conffile_list
1670          * is NULL (otherwise get_header_tar may optimize name saving out):
1671          */
1672         archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_REMEMBER_NAMES | ARCHIVE_UNLINK_OLD;
1673         archive_handle->dpkg__sub_archive->filter = filter_rename_config;
1674         archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1675         archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
1676         unpack_ar_archive(archive_handle);
1677
1678         /* Create the list file */
1679         list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1680         out_stream = xfopen_for_write(list_filename);
1681         archive_handle->dpkg__sub_archive->passed = llist_rev(archive_handle->dpkg__sub_archive->passed);
1682         while (archive_handle->dpkg__sub_archive->passed) {
1683                 char *filename = llist_pop(&archive_handle->dpkg__sub_archive->passed);
1684                 /* the leading . has been stripped by data_extract_all_prefix already */
1685                 fprintf(out_stream, "%s\n", filename);
1686                 free(filename);
1687         }
1688         fclose(out_stream);
1689
1690         /* change status */
1691         set_status(status_num, "install", 1);
1692         set_status(status_num, "unpacked", 3);
1693
1694         free(info_prefix);
1695         free(list_filename);
1696 }
1697
1698 static void configure_package(deb_file_t *deb_file)
1699 {
1700         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1701         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1702         const int status_num = search_status_hashtable(package_name);
1703
1704         printf("Setting up %s (%s)...\n", package_name, package_version);
1705
1706         /* Run the postinst script */
1707         /* TODO: handle failure gracefully */
1708         run_package_script_or_die(package_name, "postinst");
1709
1710         /* Change status to reflect success */
1711         set_status(status_num, "install", 1);
1712         set_status(status_num, "installed", 3);
1713 }
1714
1715 int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1716 int dpkg_main(int argc UNUSED_PARAM, char **argv)
1717 {
1718         deb_file_t **deb_file = NULL;
1719         status_node_t *status_node;
1720         char *str_f;
1721         int opt;
1722         int package_num;
1723         int deb_count = 0;
1724         int state_status;
1725         int status_num;
1726         int i;
1727 #if ENABLE_LONG_OPTS
1728         static const char dpkg_longopts[] ALIGN1 =
1729 // FIXME: we use -C non-compatibly, should be:
1730 // "-C|--audit Check for broken package(s)"
1731                 "configure\0"      No_argument        "C"
1732                 "force\0"          Required_argument  "F"
1733                 "install\0"        No_argument        "i"
1734                 "list\0"           No_argument        "l"
1735                 "purge\0"          No_argument        "P"
1736                 "remove\0"         No_argument        "r"
1737                 "unpack\0"         No_argument        "u"
1738                 "force-depends\0"  No_argument        "\xff"
1739                 "force-confnew\0"  No_argument        "\xfe"
1740                 "force-confold\0"  No_argument        "\xfd"
1741                 ;
1742 #endif
1743
1744         INIT_G();
1745
1746         IF_LONG_OPTS(applet_long_options = dpkg_longopts);
1747         opt = getopt32(argv, "CilPruF:", &str_f);
1748         argv += optind;
1749         //if (opt & OPT_configure) ... // -C
1750         if (opt & OPT_force) { // -F (--force in official dpkg)
1751                 if (strcmp(str_f, "depends") == 0)
1752                         opt |= OPT_force_ignore_depends;
1753                 else if (strcmp(str_f, "confnew") == 0)
1754                         opt |= OPT_force_confnew;
1755                 else if (strcmp(str_f, "confold") == 0)
1756                         opt |= OPT_force_confold;
1757                 else
1758                         bb_show_usage();
1759                 option_mask32 = opt;
1760         }
1761         //if (opt & OPT_install) ... // -i
1762         //if (opt & OPT_list_installed) ... // -l
1763         //if (opt & OPT_purge) ... // -P
1764         //if (opt & OPT_remove) ... // -r
1765         //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1766         if (!(opt & OPTMASK_cmd) /* no cmd */
1767          || ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
1768         ) {
1769                 bb_show_usage();
1770         }
1771
1772 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1773         index_status_file("/var/lib/dpkg/status");
1774
1775         /* if the list action was given print the installed packages and exit */
1776         if (opt & OPT_list_installed) {
1777                 list_packages(argv[0]); /* param can be NULL */
1778                 return EXIT_SUCCESS;
1779         }
1780
1781         /* Read arguments and store relevant info in structs */
1782         while (*argv) {
1783                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1784                 deb_file = xrealloc_vector(deb_file, 2, deb_count);
1785                 deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1786                 if (opt & (OPT_install | OPT_unpack)) {
1787                         /* -i/-u: require filename */
1788                         archive_handle_t *archive_handle;
1789                         llist_t *control_list = NULL;
1790
1791                         /* Extract the control file */
1792                         llist_add_to(&control_list, (char*)"./control");
1793                         archive_handle = init_archive_deb_ar(argv[0]);
1794                         init_archive_deb_control(archive_handle);
1795                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1796                         if (deb_file[deb_count]->control_file == NULL) {
1797                                 bb_error_msg_and_die("can't extract control file");
1798                         }
1799                         deb_file[deb_count]->filename = xstrdup(argv[0]);
1800                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1801
1802                         if (package_num == -1) {
1803                                 bb_error_msg("invalid control file in %s", argv[0]);
1804                                 argv++;
1805                                 continue;
1806                         }
1807                         deb_file[deb_count]->package = (unsigned) package_num;
1808
1809                         /* Add the package to the status hashtable */
1810                         if (opt & (OPT_unpack | OPT_install)) {
1811                                 /* Try and find a currently installed version of this package */
1812                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1813                                 /* If no previous entry was found initialise a new entry */
1814                                 if (status_hashtable[status_num] == NULL
1815                                  || status_hashtable[status_num]->status == 0
1816                                 ) {
1817                                         status_node = xmalloc(sizeof(status_node_t));
1818                                         status_node->package = deb_file[deb_count]->package;
1819                                         /* reinstreq isnt changed to "ok" until the package control info
1820                                          * is written to the status file*/
1821                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1822                                         status_hashtable[status_num] = status_node;
1823                                 } else {
1824                                         set_status(status_num, "install", 1);
1825                                         set_status(status_num, "reinstreq", 2);
1826                                 }
1827                         }
1828                 } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1829                         /* -C/-p/-r: require package name */
1830                         deb_file[deb_count]->package = search_package_hashtable(
1831                                         search_name_hashtable(argv[0]),
1832                                         search_name_hashtable("ANY"), VER_ANY);
1833                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1834                                 bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1835                         }
1836                         package_num = deb_file[deb_count]->package;
1837                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1838                         state_status = get_status(status_num, 3);
1839
1840                         /* check package status is "installed" */
1841                         if (opt & OPT_remove) {
1842                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0
1843                                  || strcmp(name_hashtable[state_status], "config-files") == 0
1844                                 ) {
1845                                         bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1846                                 }
1847                                 set_status(status_num, "deinstall", 1);
1848                         } else if (opt & OPT_purge) {
1849                                 /* if package status is "conf-files" then its ok */
1850                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1851                                         bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1852                                 }
1853                                 set_status(status_num, "purge", 1);
1854                         }
1855                 }
1856                 deb_count++;
1857                 argv++;
1858         }
1859         if (!deb_count)
1860                 bb_error_msg_and_die("no package files specified");
1861         deb_file[deb_count] = NULL;
1862
1863         /* Check that the deb file arguments are installable */
1864         if (!(opt & OPT_force_ignore_depends)) {
1865                 if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1866                         bb_error_msg_and_die("dependency check failed");
1867                 }
1868         }
1869
1870         /* TODO: install or remove packages in the correct dependency order */
1871         for (i = 0; i < deb_count; i++) {
1872                 /* Remove or purge packages */
1873                 if (opt & OPT_remove) {
1874                         remove_package(deb_file[i]->package, 1);
1875                 }
1876                 else if (opt & OPT_purge) {
1877                         purge_package(deb_file[i]->package);
1878                 }
1879                 else if (opt & OPT_unpack) {
1880                         unpack_package(deb_file[i]);
1881                 }
1882                 else if (opt & OPT_install) {
1883                         unpack_package(deb_file[i]);
1884                         /* package is configured in second pass below */
1885                 }
1886                 else if (opt & OPT_configure) {
1887                         configure_package(deb_file[i]);
1888                 }
1889         }
1890         /* configure installed packages */
1891         if (opt & OPT_install) {
1892                 for (i = 0; i < deb_count; i++)
1893                         configure_package(deb_file[i]);
1894         }
1895
1896         write_status_file(deb_file);
1897
1898         if (ENABLE_FEATURE_CLEAN_UP) {
1899                 for (i = 0; i < deb_count; i++) {
1900                         free(deb_file[i]->control_file);
1901                         free(deb_file[i]->filename);
1902                         free(deb_file[i]);
1903                 }
1904
1905                 free(deb_file);
1906
1907                 for (i = 0; i < NAME_HASH_PRIME; i++) {
1908                         free(name_hashtable[i]);
1909                 }
1910
1911                 for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1912                         free_package(package_hashtable[i]);
1913                 }
1914
1915                 for (i = 0; i < STATUS_HASH_PRIME; i++) {
1916                         free(status_hashtable[i]);
1917                 }
1918
1919                 free(status_hashtable);
1920                 free(package_hashtable);
1921                 free(name_hashtable);
1922         }
1923
1924         return EXIT_SUCCESS;
1925 }