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  * known difference between busybox dpkg and the official dpkg that i don't
  19  * consider important, its worth keeping a note of differences anyway, just to
  20  * make it easier to maintain.
  21  *  - the first value for the confflile: field isn't placed on a new line.
  22  *  - when installing a package the status: field is placed at the end of the
  23  *      section, rather than just after the package: field.
  24  *
  25  * bugs that need to be fixed
  26  *  - (unknown, please let me know when you find any)
  27  */
  28 //config:config DPKG
  29 //config:       bool "dpkg (44 kb)"
  30 //config:       default y
  31 //config:       select FEATURE_SEAMLESS_GZ
  32 //config:       help
  33 //config:       dpkg is a medium-level tool to install, build, remove and manage
  34 //config:       Debian packages.
  35 //config:
  36 //config:       This implementation of dpkg has a number of limitations,
  37 //config:       you should use the official dpkg if possible.
  38
  39 //applet:IF_DPKG(APPLET(dpkg, BB_DIR_USR_BIN, BB_SUID_DROP))
  40
  41 //kbuild:lib-$(CONFIG_DPKG) += dpkg.o
  42
  43 //usage:#define dpkg_trivial_usage
  44 //usage:       "[-ilCPru] [-F OPT] PACKAGE"
  45 //usage:#define dpkg_full_usage "\n\n"
  46 //usage:       "Install, remove and manage Debian packages\n"
  47 //usage:        IF_LONG_OPTS(
  48 //usage:     "\n        -i,--install    Install the package"
  49 //usage:     "\n        -l,--list       List of installed packages"
  50 //usage:     "\n        --configure     Configure an unpackaged package"
  51 //usage:     "\n        -P,--purge      Purge all files of a package"
  52 //usage:     "\n        -r,--remove     Remove all but the configuration files for a package"
  53 //usage:     "\n        --unpack        Unpack a package, but don't configure it"
  54 //usage:     "\n        --force-depends Ignore dependency problems"
  55 //usage:     "\n        --force-confnew Overwrite existing config files when installing"
  56 //usage:     "\n        --force-confold Keep old config files when installing"
  57 //usage:        )
  58 //usage:        IF_NOT_LONG_OPTS(
  59 //usage:     "\n        -i              Install the package"
  60 //usage:     "\n        -l              List of installed packages"
  61 //usage:     "\n        -C              Configure an unpackaged package"
  62 //usage:     "\n        -P              Purge all files of a package"
  63 //usage:     "\n        -r              Remove all but the configuration files for a package"
  64 //usage:     "\n        -u              Unpack a package, but don't configure it"
  65 //usage:     "\n        -F depends      Ignore dependency problems"
  66 //usage:     "\n        -F confnew      Overwrite existing config files when installing"
  67 //usage:     "\n        -F confold      Keep old config files when installing"
  68 //usage:        )
  69
  70 #include "libbb.h"
  71 #include <fnmatch.h>
  72 #include "bb_archive.h"
  73
  74 /* note: if you vary hash_prime sizes be aware,
  75  * 1) tweaking these will have a big effect on how much memory this program uses.
  76  * 2) for computational efficiency these hash tables should be at least 20%
  77  *    larger than the maximum number of elements stored in it.
  78  * 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
  79  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
  80  * 4) if you go bigger than 15 bits you may get into trouble (untested) as its
  81  *    sometimes cast to an unsigned, if you go to 16 bit you will overlap
  82  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
  83  */
  84
  85 /* NAME_HASH_PRIME, Stores package names and versions,
  86  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
  87  * as there a lot of duplicate version numbers */
  88 #define NAME_HASH_PRIME 16381
  89
  90 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
  91  * It must not be smaller than STATUS_HASH_PRIME,
  92  * Currently only packages from status_hashtable are stored in here, but in
  93  * future this may be used to store packages not only from a status file,
  94  * but an available_hashtable, and even multiple packages files.
  95  * Package can be stored more than once if they have different versions.
  96  * e.g. The same package may have different versions in the status file
  97  *      and available file */
  98 #define PACKAGE_HASH_PRIME 10007
  99 typedef struct edge_s {
 100         unsigned operator:4; /* was:3 */
 101         unsigned type:4;
 102         unsigned name:16; /* was:14 */
 103         unsigned version:16; /* was:14 */
 104 } edge_t;
 105
 106 typedef struct common_node_s {
 107         unsigned name:16; /* was:14 */
 108         unsigned version:16; /* was:14 */
 109         unsigned num_of_edges:16; /* was:14 */
 110         edge_t **edge;
 111 } common_node_t;
 112
 113 /* Currently it doesn't store packages that have state-status of not-installed
 114  * So it only really has to be the size of the maximum number of packages
 115  * likely to be installed at any one time, so there is a bit of leeway here */
 116 #define STATUS_HASH_PRIME 8191
 117 typedef struct status_node_s {
 118         unsigned package:16; /* was:14 */       /* has to fit PACKAGE_HASH_PRIME */
 119         unsigned status:16; /* was:14 */        /* has to fit STATUS_HASH_PRIME */
 120 } status_node_t;
 121
 122
 123 /* Globals */
 124 struct globals {
 125         char          *name_hashtable[NAME_HASH_PRIME + 1];
 126         common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
 127         status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
 128 };
 129 #define G (*ptr_to_globals)
 130 #define name_hashtable    (G.name_hashtable   )
 131 #define package_hashtable (G.package_hashtable)
 132 #define status_hashtable  (G.status_hashtable )
 133 #define INIT_G() do { \
 134         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 135 } while (0)
 136
 137
 138 /* Even numbers are for 'extras', like ored dependencies or null */
 139 enum edge_type_e {
 140         EDGE_NULL = 0,
 141         EDGE_PRE_DEPENDS = 1,
 142         EDGE_OR_PRE_DEPENDS = 2,
 143         EDGE_DEPENDS = 3,
 144         EDGE_OR_DEPENDS = 4,
 145         EDGE_REPLACES = 5,
 146         EDGE_PROVIDES = 7,
 147         EDGE_CONFLICTS = 9,
 148         EDGE_SUGGESTS = 11,
 149         EDGE_RECOMMENDS = 13,
 150         EDGE_ENHANCES = 15
 151 };
 152 enum operator_e {
 153         VER_NULL = 0,
 154         VER_EQUAL = 1,
 155         VER_LESS = 2,
 156         VER_LESS_EQUAL = 3,
 157         VER_MORE = 4,
 158         VER_MORE_EQUAL = 5,
 159         VER_ANY = 6
 160 };
 161
 162 typedef struct deb_file_s {
 163         char *control_file;
 164         char *filename;
 165         unsigned package:16; /* was:14 */
 166 } deb_file_t;
 167
 168
 169 static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
 170 {
 171         unsigned long hash_num = key[0];
 172         int len = strlen(key);
 173         int i;
 174
 175         /* Maybe i should have uses a "proper" hashing algorithm here instead
 176          * of making one up myself, seems to be working ok though. */
 177         for (i = 1; i < len; i++) {
 178                 /* shifts the ascii based value and adds it to previous value
 179                  * shift amount is mod 24 because long int is 32 bit and data
 180                  * to be shifted is 8, don't want to shift data to where it has
 181                  * no effect */
 182                 hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
 183         }
 184         *start = (unsigned) hash_num % hash_prime;
 185         *decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
 186 }
 187
 188 /* this adds the key to the hash table */
 189 static int search_name_hashtable(const char *key)
 190 {
 191         unsigned probe_address;
 192         unsigned probe_decrement;
 193
 194         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 195         while (name_hashtable[probe_address] != NULL) {
 196                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 197                         return probe_address;
 198                 }
 199                 probe_address -= probe_decrement;
 200                 if ((int)probe_address < 0) {
 201                         probe_address += NAME_HASH_PRIME;
 202                 }
 203         }
 204         name_hashtable[probe_address] = xstrdup(key);
 205         return probe_address;
 206 }
 207
 208 /* this DOESN'T add the key to the hashtable
 209  * TODO make it consistent with search_name_hashtable
 210  */
 211 static unsigned search_status_hashtable(const char *key)
 212 {
 213         unsigned probe_address;
 214         unsigned probe_decrement;
 215
 216         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 217         while (status_hashtable[probe_address] != NULL) {
 218                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 219                         break;
 220                 }
 221                 probe_address -= probe_decrement;
 222                 if ((int)probe_address < 0) {
 223                         probe_address += STATUS_HASH_PRIME;
 224                 }
 225         }
 226         return probe_address;
 227 }
 228
 229 static int order(char x)
 230 {
 231         return (x == '~' ? -1
 232                 : x == '\0' ? 0
 233                 : isdigit(x) ? 0
 234                 : isalpha(x) ? x
 235                 : (unsigned char)x + 256
 236         );
 237 }
 238
 239 /* This code is taken from dpkg and modified slightly to work with busybox */
 240 static int version_compare_part(const char *val, const char *ref)
 241 {
 242         if (!val) val = "";
 243         if (!ref) ref = "";
 244
 245         while (*val || *ref) {
 246                 int first_diff;
 247
 248                 while ((*val && !isdigit(*val)) || (*ref && !isdigit(*ref))) {
 249                         int vc = order(*val);
 250                         int rc = order(*ref);
 251                         if (vc != rc)
 252                                 return vc - rc;
 253                         val++;
 254                         ref++;
 255                 }
 256
 257                 while (*val == '0')
 258                         val++;
 259                 while (*ref == '0')
 260                         ref++;
 261
 262                 first_diff = 0;
 263                 while (isdigit(*val) && isdigit(*ref)) {
 264                         if (first_diff == 0)
 265                                 first_diff = *val - *ref;
 266                         val++;
 267                         ref++;
 268                 }
 269                 if (isdigit(*val))
 270                         return 1;
 271                 if (isdigit(*ref))
 272                         return -1;
 273                 if (first_diff)
 274                         return first_diff;
 275         }
 276         return 0;
 277 }
 278
 279 /* if ver1 < ver2 return -1,
 280  * if ver1 = ver2 return 0,
 281  * if ver1 > ver2 return 1,
 282  */
 283 static int version_compare(const unsigned ver1, const unsigned ver2)
 284 {
 285         char *ch_ver1 = name_hashtable[ver1];
 286         char *ch_ver2 = name_hashtable[ver2];
 287         unsigned epoch1 = 0, epoch2 = 0;
 288         char *colon;
 289         char *deb_ver1, *deb_ver2;
 290         char *upstream_ver1;
 291         char *upstream_ver2;
 292         int result;
 293
 294         /* Compare epoch */
 295         colon = strchr(ch_ver1, ':');
 296         if (colon) {
 297                 epoch1 = atoi(ch_ver1);
 298                 ch_ver1 = colon + 1;
 299         }
 300         colon = strchr(ch_ver2, ':');
 301         if (colon) {
 302                 epoch2 = atoi(ch_ver2);
 303                 ch_ver2 = colon + 1;
 304         }
 305         if (epoch1 < epoch2) {
 306                 return -1;
 307         }
 308         if (epoch1 > epoch2) {
 309                 return 1;
 310         }
 311
 312         /* Compare upstream version */
 313         upstream_ver1 = xstrdup(ch_ver1);
 314         upstream_ver2 = xstrdup(ch_ver2);
 315
 316         /* Chop off debian version, and store for later use */
 317         deb_ver1 = strrchr(upstream_ver1, '-');
 318         deb_ver2 = strrchr(upstream_ver2, '-');
 319         if (deb_ver1) {
 320                 *deb_ver1++ = '\0';
 321         }
 322         if (deb_ver2) {
 323                 *deb_ver2++ = '\0';
 324         }
 325         result = version_compare_part(upstream_ver1, upstream_ver2);
 326         if (result == 0) {
 327                 /* Compare debian versions */
 328                 result = version_compare_part(deb_ver1, deb_ver2);
 329         }
 330
 331         free(upstream_ver1);
 332         free(upstream_ver2);
 333         return result;
 334 }
 335
 336 static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
 337 {
 338         const int version_result = version_compare(version1, version2);
 339         switch (operator) {
 340         case VER_ANY:
 341                 return TRUE;
 342         case VER_EQUAL:
 343                 return (version_result == 0);
 344         case VER_LESS:
 345                 return (version_result < 0);
 346         case VER_LESS_EQUAL:
 347                 return (version_result <= 0);
 348         case VER_MORE:
 349                 return (version_result > 0);
 350         case VER_MORE_EQUAL:
 351                 return (version_result >= 0);
 352         }
 353         return FALSE;
 354 }
 355
 356 static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
 357 {
 358         unsigned probe_address;
 359         unsigned probe_decrement;
 360
 361         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 362         while (package_hashtable[probe_address] != NULL) {
 363                 if (package_hashtable[probe_address]->name == name) {
 364                         if (operator == VER_ANY) {
 365                                 return probe_address;
 366                         }
 367                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 368                                 return probe_address;
 369                         }
 370                 }
 371                 probe_address -= probe_decrement;
 372                 if ((int)probe_address < 0) {
 373                         probe_address += PACKAGE_HASH_PRIME;
 374                 }
 375         }
 376         return probe_address;
 377 }
 378
 379 /*
 380  * This function searches through the entire package_hashtable looking
 381  * for a package which provides "needle". It returns the index into
 382  * the package_hashtable for the providing package.
 383  *
 384  * needle is the index into name_hashtable of the package we are
 385  * looking for.
 386  *
 387  * start_at is the index in the package_hashtable to start looking
 388  * at. If start_at is -1 then start at the beginning. This is to allow
 389  * for repeated searches since more than one package might provide
 390  * needle.
 391  *
 392  * FIXME: I don't think this is very efficient, but I thought I'd keep
 393  * it simple for now until it proves to be a problem.
 394  */
 395 static int search_for_provides(int needle, int start_at)
 396 {
 397         int i, j;
 398         common_node_t *p;
 399         for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
 400                 p = package_hashtable[i];
 401                 if (p == NULL)
 402                         continue;
 403                 for (j = 0; j < p->num_of_edges; j++)
 404                         if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
 405                                 return i;
 406         }
 407         return -1;
 408 }
 409
 410 /*
 411  * Add an edge to a node
 412  */
 413 static void add_edge_to_node(common_node_t *node, edge_t *edge)
 414 {
 415         node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
 416         node->edge[node->num_of_edges++] = edge;
 417 }
 418
 419 /*
 420  * Create one new node and one new edge for every dependency.
 421  *
 422  * Dependencies which contain multiple alternatives are represented as
 423  * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
 424  * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
 425  * the OR edge contains the full dependency string while the version
 426  * field contains the number of EDGE nodes which follow as part of
 427  * this alternative.
 428  */
 429 static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
 430 {
 431         char *line = xstrdup(whole_line);
 432         char *line2;
 433         char *line_ptr1 = NULL;
 434         char *line_ptr2 = NULL;
 435         char *field;
 436         char *field2;
 437         char *version;
 438         edge_t *edge;
 439         edge_t *or_edge;
 440         int offset_ch;
 441
 442         field = strtok_r(line, ",", &line_ptr1);
 443         do {
 444                 /* skip leading spaces */
 445                 field += strspn(field, " ");
 446                 line2 = xstrdup(field);
 447                 field2 = strtok_r(line2, "|", &line_ptr2);
 448                 or_edge = NULL;
 449                 if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
 450                  && (strcmp(field, field2) != 0)
 451                 ) {
 452                         or_edge = xzalloc(sizeof(edge_t));
 453                         or_edge->type = edge_type + 1;
 454                         or_edge->name = search_name_hashtable(field);
 455                         //or_edge->version = 0; // tracks the number of alternatives
 456                         add_edge_to_node(parent_node, or_edge);
 457                 }
 458
 459                 do {
 460                         edge = xmalloc(sizeof(edge_t));
 461                         edge->type = edge_type;
 462
 463                         /* Skip any extra leading spaces */
 464                         field2 += strspn(field2, " ");
 465
 466                         /* Get dependency version info */
 467                         version = strchr(field2, '(');
 468                         if (version == NULL) {
 469                                 edge->operator = VER_ANY;
 470                                 /* Get the versions hash number, adding it if the number isn't already in there */
 471                                 edge->version = search_name_hashtable("ANY");
 472                         } else {
 473                                 /* Skip leading ' ' or '(' */
 474                                 version += strspn(version, " (");
 475                                 /* Calculate length of any operator characters */
 476                                 offset_ch = strspn(version, "<=>");
 477                                 /* Determine operator */
 478                                 if (offset_ch > 0) {
 479                                         if (strncmp(version, "=", offset_ch) == 0) {
 480                                                 edge->operator = VER_EQUAL;
 481                                         } else if (strncmp(version, "<<", offset_ch) == 0) {
 482                                                 edge->operator = VER_LESS;
 483                                         } else if (strncmp(version, "<=", offset_ch) == 0) {
 484                                                 edge->operator = VER_LESS_EQUAL;
 485                                         } else if (strncmp(version, ">>", offset_ch) == 0) {
 486                                                 edge->operator = VER_MORE;
 487                                         } else if (strncmp(version, ">=", offset_ch) == 0) {
 488                                                 edge->operator = VER_MORE_EQUAL;
 489                                         } else {
 490                                                 bb_error_msg_and_die("illegal operator");
 491                                         }
 492                                 }
 493                                 /* skip to start of version numbers */
 494                                 version += offset_ch;
 495                                 version += strspn(version, " ");
 496
 497                                 /* Truncate version at trailing ' ' or ')' */
 498                                 version[strcspn(version, " )")] = '\0';
 499                                 /* Get the versions hash number, adding it if the number isn't already in there */
 500                                 edge->version = search_name_hashtable(version);
 501                         }
 502
 503                         /* Get the dependency name */
 504                         field2[strcspn(field2, " (")] = '\0';
 505                         edge->name = search_name_hashtable(field2);
 506
 507                         if (or_edge)
 508                                 or_edge->version++;
 509
 510                         add_edge_to_node(parent_node, edge);
 511                         field2 = strtok_r(NULL, "|", &line_ptr2);
 512                 } while (field2 != NULL);
 513
 514                 free(line2);
 515                 field = strtok_r(NULL, ",", &line_ptr1);
 516         } while (field != NULL);
 517
 518         free(line);
 519 }
 520
 521 static void free_package(common_node_t *node)
 522 {
 523         unsigned i;
 524         if (node) {
 525                 for (i = 0; i < node->num_of_edges; i++) {
 526                         free(node->edge[i]);
 527                 }
 528                 free(node->edge);
 529                 free(node);
 530         }
 531 }
 532
 533 /*
 534  * Gets the next package field from package_buffer, separated into the field name
 535  * and field value, it returns the int offset to the first character of the next field
 536  */
 537 static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
 538 {
 539         int offset_name_start = 0;
 540         int offset_name_end = 0;
 541         int offset_value_start = 0;
 542         int offset_value_end = 0;
 543         int offset = 0;
 544         int next_offset;
 545         int name_length;
 546         int value_length;
 547         int exit_flag = FALSE;
 548
 549         if (package_buffer == NULL) {
 550                 *field_name = NULL;
 551                 *field_value = NULL;
 552                 return -1;
 553         }
 554         while (1) {
 555                 next_offset = offset + 1;
 556                 switch (package_buffer[offset]) {
 557                         case '\0':
 558                                 exit_flag = TRUE;
 559                                 break;
 560                         case ':':
 561                                 if (offset_name_end == 0) {
 562                                         offset_name_end = offset;
 563                                         offset_value_start = next_offset;
 564                                 }
 565                                 /* TODO: Name might still have trailing spaces if ':' isn't
 566                                  * immediately after name */
 567                                 break;
 568                         case '\n':
 569                                 /* TODO: The char next_offset may be out of bounds */
 570                                 if (package_buffer[next_offset] != ' ') {
 571                                         exit_flag = TRUE;
 572                                         break;
 573                                 }
 574                         case '\t':
 575                         case ' ':
 576                                 /* increment the value start point if its a just filler */
 577                                 if (offset_name_start == offset) {
 578                                         offset_name_start++;
 579                                 }
 580                                 if (offset_value_start == offset) {
 581                                         offset_value_start++;
 582                                 }
 583                                 break;
 584                 }
 585                 if (exit_flag) {
 586                         /* Check that the names are valid */
 587                         offset_value_end = offset;
 588                         name_length = offset_name_end - offset_name_start;
 589                         value_length = offset_value_end - offset_value_start;
 590                         if (name_length == 0) {
 591                                 break;
 592                         }
 593                         if ((name_length > 0) && (value_length > 0)) {
 594                                 break;
 595                         }
 596
 597                         /* If not valid, start fresh with next field */
 598                         exit_flag = FALSE;
 599                         offset_name_start = offset + 1;
 600                         offset_name_end = 0;
 601                         offset_value_start = offset + 1;
 602                         offset_value_end = offset + 1;
 603                         offset++;
 604                 }
 605                 offset++;
 606         }
 607         *field_name = NULL;
 608         if (name_length) {
 609                 *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
 610         }
 611         *field_value = NULL;
 612         if (value_length > 0) {
 613                 *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
 614         }
 615         return next_offset;
 616 }
 617
 618 static unsigned fill_package_struct(char *control_buffer)
 619 {
 620         static const char field_names[] ALIGN1 =
 621                 "Package\0""Version\0"
 622                 "Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
 623                 "Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
 624
 625         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 626         char *field_name;
 627         char *field_value;
 628         int field_start = 0;
 629         int num = -1;
 630         int buffer_length = strlen(control_buffer);
 631
 632         new_node->version = search_name_hashtable("unknown");
 633         while (field_start < buffer_length) {
 634                 unsigned field_num;
 635
 636                 field_start += read_package_field(&control_buffer[field_start],
 637                                 &field_name, &field_value);
 638
 639                 if (field_name == NULL) {
 640                         goto fill_package_struct_cleanup;
 641                 }
 642
 643                 field_num = index_in_strings(field_names, field_name);
 644                 switch (field_num) {
 645                 case 0: /* Package */
 646                         new_node->name = search_name_hashtable(field_value);
 647                         break;
 648                 case 1: /* Version */
 649                         new_node->version = search_name_hashtable(field_value);
 650                         break;
 651                 case 2: /* Pre-Depends */
 652                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 653                         break;
 654                 case 3: /* Depends */
 655                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 656                         break;
 657                 case 4: /* Replaces */
 658                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 659                         break;
 660                 case 5: /* Provides */
 661                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 662                         break;
 663                 case 6: /* Conflicts */
 664                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 665                         break;
 666                 case 7: /* Suggests */
 667                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 668                         break;
 669                 case 8: /* Recommends */
 670                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 671                         break;
 672                 case 9: /* Enhances */
 673                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 674                         break;
 675                 }
 676  fill_package_struct_cleanup:
 677                 free(field_name);
 678                 free(field_value);
 679         }
 680
 681         if (new_node->version == search_name_hashtable("unknown")) {
 682                 free_package(new_node);
 683                 return -1;
 684         }
 685         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 686         free_package(package_hashtable[num]);
 687         package_hashtable[num] = new_node;
 688         return num;
 689 }
 690
 691 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 692 static unsigned get_status(const unsigned status_node, const int num)
 693 {
 694         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 695         char *state_sub_string;
 696         unsigned state_sub_num;
 697         int len;
 698         int i;
 699
 700         /* set tmp_string to point to the start of the word number */
 701         for (i = 1; i < num; i++) {
 702                 /* skip past a word */
 703                 status_string += strcspn(status_string, " ");
 704                 /* skip past the separating spaces */
 705                 status_string += strspn(status_string, " ");
 706         }
 707         len = strcspn(status_string, " \n");
 708         state_sub_string = xstrndup(status_string, len);
 709         state_sub_num = search_name_hashtable(state_sub_string);
 710         free(state_sub_string);
 711         return state_sub_num;
 712 }
 713
 714 static void set_status(const unsigned status_node_num, const char *new_value, const int position)
 715 {
 716         const unsigned new_value_num = search_name_hashtable(new_value);
 717         unsigned want = get_status(status_node_num, 1);
 718         unsigned flag = get_status(status_node_num, 2);
 719         unsigned status = get_status(status_node_num, 3);
 720         char *new_status;
 721
 722         switch (position) {
 723                 case 1:
 724                         want = new_value_num;
 725                         break;
 726                 case 2:
 727                         flag = new_value_num;
 728                         break;
 729                 case 3:
 730                         status = new_value_num;
 731                         break;
 732                 default:
 733                         bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 734         }
 735
 736         new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 737         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 738         free(new_status);
 739 }
 740
 741 static const char *describe_status(int status_num)
 742 {
 743         int status_want, status_state;
 744         if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
 745                 return "is not installed or flagged to be installed";
 746
 747         status_want = get_status(status_num, 1);
 748         status_state = get_status(status_num, 3);
 749
 750         if (status_state == search_name_hashtable("installed")) {
 751                 if (status_want == search_name_hashtable("install"))
 752                         return "is installed";
 753                 if (status_want == search_name_hashtable("deinstall"))
 754                         return "is marked to be removed";
 755                 if (status_want == search_name_hashtable("purge"))
 756                         return "is marked to be purged";
 757         }
 758         if (status_want == search_name_hashtable("unknown"))
 759                 return "is in an indeterminate state";
 760         if (status_want == search_name_hashtable("install"))
 761                 return "is marked to be installed";
 762
 763         return "is not installed or flagged to be installed";
 764 }
 765
 766 static void index_status_file(const char *filename)
 767 {
 768         FILE *status_file;
 769         char *control_buffer;
 770         char *status_line;
 771         status_node_t *status_node = NULL;
 772         unsigned status_num;
 773
 774         status_file = xfopen_for_read(filename);
 775         while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
 776                 const unsigned package_num = fill_package_struct(control_buffer);
 777                 if (package_num != -1) {
 778                         status_node = xmalloc(sizeof(status_node_t));
 779                         /* fill_package_struct doesn't handle the status field */
 780                         status_line = strstr(control_buffer, "Status:");
 781                         if (status_line != NULL) {
 782                                 status_line += 7;
 783                                 status_line += strspn(status_line, " \n\t");
 784                                 status_line = xstrndup(status_line, strcspn(status_line, "\n"));
 785                                 status_node->status = search_name_hashtable(status_line);
 786                                 free(status_line);
 787                         }
 788                         status_node->package = package_num;
 789                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 790                         status_hashtable[status_num] = status_node;
 791                 }
 792                 free(control_buffer);
 793         }
 794         fclose(status_file);
 795 }
 796
 797 static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 798 {
 799         char *name;
 800         char *value;
 801         int start = 0;
 802         while (1) {
 803                 start += read_package_field(&control_buffer[start], &name, &value);
 804                 if (name == NULL) {
 805                         break;
 806                 }
 807                 if (strcmp(name, "Status") != 0) {
 808                         fprintf(new_status_file, "%s: %s\n", name, value);
 809                 }
 810         }
 811 }
 812
 813 /* This could do with a cleanup */
 814 static void write_status_file(deb_file_t **deb_file)
 815 {
 816         FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
 817         FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
 818         char *package_name;
 819         char *status_from_file;
 820         char *control_buffer = NULL;
 821         char *tmp_string;
 822         int status_num;
 823         int field_start = 0;
 824         int write_flag;
 825         int i = 0;
 826
 827         /* Update previously known packages */
 828         while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
 829                 tmp_string = strstr(control_buffer, "Package:");
 830                 if (tmp_string == NULL) {
 831                         continue;
 832                 }
 833
 834                 tmp_string += 8;
 835                 tmp_string += strspn(tmp_string, " \n\t");
 836                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 837                 write_flag = FALSE;
 838                 tmp_string = strstr(control_buffer, "Status:");
 839                 if (tmp_string != NULL) {
 840                         /* Separate the status value from the control buffer */
 841                         tmp_string += 7;
 842                         tmp_string += strspn(tmp_string, " \n\t");
 843                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 844                 } else {
 845                         status_from_file = NULL;
 846                 }
 847
 848                 /* Find this package in the status hashtable */
 849                 status_num = search_status_hashtable(package_name);
 850                 if (status_hashtable[status_num] != NULL) {
 851                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 852                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 853                                 /* New status isn't exactly the same as old status */
 854                                 const int state_status = get_status(status_num, 3);
 855                                 if ((strcmp("installed", name_hashtable[state_status]) == 0)
 856                                  || (strcmp("unpacked", name_hashtable[state_status]) == 0)
 857                                 ) {
 858                                         /* We need to add the control file from the package */
 859                                         i = 0;
 860                                         while (deb_file[i] != NULL) {
 861                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 862                                                         /* Write a status file entry with a modified status */
 863                                                         /* remove trailing \n's */
 864                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 865                                                         set_status(status_num, "ok", 2);
 866                                                         fprintf(new_status_file, "Status: %s\n\n",
 867                                                                         name_hashtable[status_hashtable[status_num]->status]);
 868                                                         write_flag = TRUE;
 869                                                         break;
 870                                                 }
 871                                                 i++;
 872                                         }
 873                                         /* This is temperary, debugging only */
 874                                         if (deb_file[i] == NULL) {
 875                                                 bb_error_msg_and_die("ALERT: cannot find a control file, "
 876                                                         "your status file may be broken, status may be "
 877                                                         "incorrect for %s", package_name);
 878                                         }
 879                                 }
 880                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 881                                         /* Only write the Package, Status, Priority and Section lines */
 882                                         fprintf(new_status_file, "Package: %s\n", package_name);
 883                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 884
 885                                         while (1) {
 886                                                 char *field_name;
 887                                                 char *field_value;
 888                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 889                                                 if (field_name == NULL) {
 890                                                         break;
 891                                                 }
 892                                                 if ((strcmp(field_name, "Priority") == 0)
 893                                                  || (strcmp(field_name, "Section") == 0)
 894                                                 ) {
 895                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 896                                                 }
 897                                         }
 898                                         write_flag = TRUE;
 899                                         fputs("\n", new_status_file);
 900                                 }
 901                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 902                                         /* only change the status line */
 903                                         while (1) {
 904                                                 char *field_name;
 905                                                 char *field_value;
 906                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 907                                                 if (field_name == NULL) {
 908                                                         break;
 909                                                 }
 910                                                 /* Setup start point for next field */
 911                                                 if (strcmp(field_name, "Status") == 0) {
 912                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 913                                                 } else {
 914                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 915                                                 }
 916                                         }
 917                                         write_flag = TRUE;
 918                                         fputs("\n", new_status_file);
 919                                 }
 920                         }
 921                 }
 922                 /* If the package from the status file wasn't handle above, do it now*/
 923                 if (!write_flag) {
 924                         fprintf(new_status_file, "%s\n\n", control_buffer);
 925                 }
 926
 927                 free(status_from_file);
 928                 free(package_name);
 929                 free(control_buffer);
 930         }
 931
 932         /* Write any new packages */
 933         for (i = 0; deb_file[i] != NULL; i++) {
 934                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 935                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 936                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 937                         set_status(status_num, "ok", 2);
 938                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 939                 }
 940         }
 941         fclose(old_status_file);
 942         fclose(new_status_file);
 943
 944         /* Create a separate backfile to dpkg */
 945         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 946                 if (errno != ENOENT)
 947                         bb_error_msg_and_die("can't create backup status file");
 948                 /* Its ok if renaming the status file fails because status
 949                  * file doesn't exist, maybe we are starting from scratch */
 950                 bb_error_msg("no status file found, creating new one");
 951         }
 952
 953         xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
 954 }
 955
 956 /* This function returns TRUE if the given package can satisfy a
 957  * dependency of type depend_type.
 958  *
 959  * A pre-depends is satisfied only if a package is already installed,
 960  * which a regular depends can be satisfied by a package which we want
 961  * to install.
 962  */
 963 static int package_satisfies_dependency(int package, int depend_type)
 964 {
 965         int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
 966
 967         /* status could be unknown if package is a pure virtual
 968          * provides which cannot satisfy any dependency by itself.
 969          */
 970         if (status_hashtable[status_num] == NULL)
 971                 return 0;
 972
 973         switch (depend_type) {
 974         case EDGE_PRE_DEPENDS: return get_status(status_num, 3) == search_name_hashtable("installed");
 975         case EDGE_DEPENDS:     return get_status(status_num, 1) == search_name_hashtable("install");
 976         }
 977         return 0;
 978 }
 979
 980 static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
 981 {
 982         int *conflicts = NULL;
 983         int conflicts_num = 0;
 984         int i = deb_start;
 985         int j;
 986
 987         /* Check for conflicts
 988          * TODO: TEST if conflicts with other packages to be installed
 989          *
 990          * Add install packages and the packages they provide
 991          * to the list of files to check conflicts for
 992          */
 993
 994         /* Create array of package numbers to check against
 995          * installed package for conflicts*/
 996         while (deb_file[i] != NULL) {
 997                 const unsigned package_num = deb_file[i]->package;
 998                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
 999                 conflicts[conflicts_num] = package_num;
1000                 conflicts_num++;
1001                 /* add provides to conflicts list */
1002                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
1003                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
1004                                 const int conflicts_package_num = search_package_hashtable(
1005                                         package_hashtable[package_num]->edge[j]->name,
1006                                         package_hashtable[package_num]->edge[j]->version,
1007                                         package_hashtable[package_num]->edge[j]->operator);
1008                                 if (package_hashtable[conflicts_package_num] == NULL) {
1009                                         /* create a new package */
1010                                         common_node_t *new_node = xzalloc(sizeof(common_node_t));
1011                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
1012                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
1013                                         package_hashtable[conflicts_package_num] = new_node;
1014                                 }
1015                                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
1016                                 conflicts[conflicts_num] = conflicts_package_num;
1017                                 conflicts_num++;
1018                         }
1019                 }
1020                 i++;
1021         }
1022
1023         /* Check conflicts */
1024         i = 0;
1025         while (deb_file[i] != NULL) {
1026                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
1027                 int status_num = 0;
1028                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1029
1030                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1031                         i++;
1032                         continue;
1033                 }
1034
1035                 for (j = 0; j < package_node->num_of_edges; j++) {
1036                         const edge_t *package_edge = package_node->edge[j];
1037
1038                         if (package_edge->type == EDGE_CONFLICTS) {
1039                                 const unsigned package_num =
1040                                         search_package_hashtable(package_edge->name,
1041                                                                 package_edge->version,
1042                                                                 package_edge->operator);
1043                                 int result = 0;
1044                                 if (package_hashtable[package_num] != NULL) {
1045                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1046
1047                                         if (get_status(status_num, 1) == search_name_hashtable("install")) {
1048                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
1049                                                         package_edge->version, package_edge->operator);
1050                                         }
1051                                 }
1052
1053                                 if (result) {
1054                                         bb_error_msg_and_die("package %s conflicts with %s",
1055                                                 name_hashtable[package_node->name],
1056                                                 name_hashtable[package_edge->name]);
1057                                 }
1058                         }
1059                 }
1060                 i++;
1061         }
1062
1063
1064         /* Check dependentcies */
1065         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1066                 int status_num = 0;
1067                 int number_of_alternatives = 0;
1068                 const edge_t * root_of_alternatives = NULL;
1069                 const common_node_t *package_node = package_hashtable[i];
1070
1071                 /* If the package node does not exist then this
1072                  * package is a virtual one. In which case there are
1073                  * no dependencies to check.
1074                  */
1075                 if (package_node == NULL) continue;
1076
1077                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1078
1079                 /* If there is no status then this package is a
1080                  * virtual one provided by something else. In which
1081                  * case there are no dependencies to check.
1082                  */
1083                 if (status_hashtable[status_num] == NULL) continue;
1084
1085                 /* If we don't want this package installed then we may
1086                  * as well ignore it's dependencies.
1087                  */
1088                 if (get_status(status_num, 1) != search_name_hashtable("install")) {
1089                         continue;
1090                 }
1091
1092                 /* This code is tested only for EDGE_DEPENDS, since I
1093                  * have no suitable pre-depends available. There is no
1094                  * reason that it shouldn't work though :-)
1095                  */
1096                 for (j = 0; j < package_node->num_of_edges; j++) {
1097                         const edge_t *package_edge = package_node->edge[j];
1098                         unsigned package_num;
1099
1100                         if (package_edge->type == EDGE_OR_PRE_DEPENDS
1101                          || package_edge->type == EDGE_OR_DEPENDS
1102                         ) {
1103                                 /* start an EDGE_OR_ list */
1104                                 number_of_alternatives = package_edge->version;
1105                                 root_of_alternatives = package_edge;
1106                                 continue;
1107                         }
1108                         if (number_of_alternatives == 0) {  /* not in the middle of an EDGE_OR_ list */
1109                                 number_of_alternatives = 1;
1110                                 root_of_alternatives = NULL;
1111                         }
1112
1113                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1114
1115                         if (package_edge->type == EDGE_PRE_DEPENDS
1116                          || package_edge->type == EDGE_DEPENDS
1117                         ) {
1118                                 int result=1;
1119                                 status_num = 0;
1120
1121                                 /* If we are inside an alternative then check
1122                                  * this edge is the right type.
1123                                  *
1124                                  * EDGE_DEPENDS == OR_DEPENDS -1
1125                                  * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1126                                  */
1127                                 if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1128                                         bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1129                                                         package_edge->type, root_of_alternatives->type);
1130
1131                                 if (package_hashtable[package_num] != NULL)
1132                                         result = !package_satisfies_dependency(package_num, package_edge->type);
1133
1134                                 if (result) { /* check for other package which provide what we are looking for */
1135                                         int provider = -1;
1136
1137                                         while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1138                                                 if (package_hashtable[provider] == NULL) {
1139                                                         puts("Have a provider but no package information for it");
1140                                                         continue;
1141                                                 }
1142                                                 result = !package_satisfies_dependency(provider, package_edge->type);
1143
1144                                                 if (result == 0)
1145                                                         break;
1146                                         }
1147                                 }
1148
1149                                 /* It must be already installed, or to be installed */
1150                                 number_of_alternatives--;
1151                                 if (result && number_of_alternatives == 0) {
1152                                         if (root_of_alternatives)
1153                                                 bb_error_msg_and_die(
1154                                                         "package %s %sdepends on %s, which %s",
1155                                                         name_hashtable[package_node->name],
1156                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1157                                                         name_hashtable[root_of_alternatives->name],
1158                                                         "cannot be satisfied");
1159                                         bb_error_msg_and_die(
1160                                                 "package %s %sdepends on %s, which %s",
1161                                                 name_hashtable[package_node->name],
1162                                                 package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1163                                                 name_hashtable[package_edge->name],
1164                                                 describe_status(status_num));
1165                                 }
1166                                 if (result == 0 && number_of_alternatives) {
1167                                         /* we've found a package which
1168                                          * satisfies the dependency,
1169                                          * so skip over the rest of
1170                                          * the alternatives.
1171                                          */
1172                                         j += number_of_alternatives;
1173                                         number_of_alternatives = 0;
1174                                 }
1175                         }
1176                 }
1177         }
1178         free(conflicts);
1179         return TRUE;
1180 }
1181
1182 static char **create_list(const char *filename)
1183 {
1184         FILE *list_stream;
1185         char **file_list;
1186         char *line;
1187         int count;
1188
1189         /* don't use [xw]fopen here, handle error ourself */
1190         list_stream = fopen_for_read(filename);
1191         if (list_stream == NULL) {
1192                 return NULL;
1193         }
1194
1195         file_list = NULL;
1196         count = 0;
1197         while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1198                 file_list = xrealloc_vector(file_list, 2, count);
1199                 file_list[count++] = line;
1200                 /*file_list[count] = NULL; - xrealloc_vector did it */
1201         }
1202         fclose(list_stream);
1203
1204         return file_list;
1205 }
1206
1207 /* maybe i should try and hook this into remove_file.c somehow */
1208 static int remove_file_array(char **remove_names, char **exclude_names)
1209 {
1210         struct stat path_stat;
1211         int remove_flag = 1; /* not removed anything yet */
1212         int i, j;
1213
1214         if (remove_names == NULL) {
1215                 return 0;
1216         }
1217         for (i = 0; remove_names[i] != NULL; i++) {
1218                 if (exclude_names != NULL) {
1219                         for (j = 0; exclude_names[j] != NULL; j++) {
1220                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1221                                         goto skip;
1222                                 }
1223                         }
1224                 }
1225                 /* TODO: why we are checking lstat? we can just try rm/rmdir */
1226                 if (lstat(remove_names[i], &path_stat) < 0) {
1227                         continue;
1228                 }
1229                 if (S_ISDIR(path_stat.st_mode)) {
1230                         remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1231                 } else {
1232                         remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1233                 }
1234  skip:
1235                 continue;
1236         }
1237         return (remove_flag == 0);
1238 }
1239
1240 static void run_package_script_or_die(const char *package_name, const char *script_type)
1241 {
1242         char *script_path;
1243         int result;
1244
1245         script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1246
1247         /* If the file doesn't exist it isn't fatal */
1248         result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1249         free(script_path);
1250         if (result)
1251                 bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1252 }
1253
1254 /*
1255 The policy manual defines what scripts get called when and with
1256 what arguments. I realize that busybox does not support all of
1257 these scenarios, but it does support some of them; it does not,
1258 however, run them with any parameters in run_package_script_or_die().
1259 Here are the scripts:
1260
1261 preinst install
1262 preinst install <old_version>
1263 preinst upgrade <old_version>
1264 preinst abort_upgrade <new_version>
1265 postinst configure <most_recent_version>
1266 postinst abort-upgade <new_version>
1267 postinst abort-remove
1268 postinst abort-remove in-favour <package> <version>
1269 postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1270 prerm remove
1271 prerm upgrade <new_version>
1272 prerm failed-upgrade <old_version>
1273 prerm remove in-favor <package> <new_version>
1274 prerm deconfigure in-favour <package> <version> removing <package> <version>
1275 postrm remove
1276 postrm purge
1277 postrm upgrade <new_version>
1278 postrm failed-upgrade <old_version>
1279 postrm abort-install
1280 postrm abort-install <old_version>
1281 postrm abort-upgrade <old_version>
1282 postrm disappear <overwriter> <version>
1283 */
1284 static const char *const all_control_files[] = {
1285         "preinst", "postinst", "prerm", "postrm",
1286         "list", "md5sums", "shlibs", "conffiles",
1287         "config", "templates"
1288 };
1289
1290 static char **all_control_list(const char *package_name)
1291 {
1292         unsigned i = 0;
1293         char **remove_files;
1294
1295         /* Create a list of all /var/lib/dpkg/info/<package> files */
1296         remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1297         while (i < ARRAY_SIZE(all_control_files)) {
1298                 remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1299                                 package_name, all_control_files[i]);
1300                 i++;
1301         }
1302
1303         return remove_files;
1304 }
1305
1306 static void free_array(char **array)
1307 {
1308         if (array) {
1309                 unsigned i = 0;
1310                 while (array[i]) {
1311                         free(array[i]);
1312                         i++;
1313                 }
1314                 free(array);
1315         }
1316 }
1317
1318 /* This function lists information on the installed packages. It loops through
1319  * the status_hashtable to retrieve the info. This results in smaller code than
1320  * scanning the status file. The resulting list, however, is unsorted.
1321  */
1322 static void list_packages(const char *pattern)
1323 {
1324         int i;
1325
1326         puts("    Name           Version");
1327         puts("+++-==============-==============");
1328
1329         /* go through status hash, dereference package hash and finally strings */
1330         for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1331                 if (status_hashtable[i]) {
1332                         const char *stat_str;  /* status string */
1333                         const char *name_str;  /* package name */
1334                         const char *vers_str;  /* version */
1335                         char  s1, s2;          /* status abbreviations */
1336                         int   spccnt;          /* space count */
1337                         int   j;
1338
1339                         stat_str = name_hashtable[status_hashtable[i]->status];
1340                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1341                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1342
1343                         if (pattern && fnmatch(pattern, name_str, 0) != 0)
1344                                 continue;
1345
1346                         /* get abbreviation for status field 1 */
1347                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1348
1349                         /* get abbreviation for status field 2 */
1350                         for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1351                                 if (stat_str[j] == ' ') spccnt++;
1352                         }
1353                         s2 = stat_str[j];
1354
1355                         /* print out the line formatted like Debian dpkg */
1356                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1357                 }
1358         }
1359 }
1360
1361 static void remove_package(const unsigned package_num, int noisy)
1362 {
1363         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1364         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1365         const unsigned status_num = search_status_hashtable(package_name);
1366         const int package_name_length = strlen(package_name);
1367         char **remove_files;
1368         char **exclude_files;
1369         char list_name[package_name_length + 25];
1370         char conffile_name[package_name_length + 30];
1371
1372         if (noisy)
1373                 printf("Removing %s (%s)...\n", package_name, package_version);
1374
1375         /* Run prerm script */
1376         run_package_script_or_die(package_name, "prerm");
1377
1378         /* Create a list of files to remove, and a separate list of those to keep */
1379         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1380         remove_files = create_list(list_name);
1381
1382         sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1383         exclude_files = create_list(conffile_name);
1384
1385         /* Some directories can't be removed straight away, so do multiple passes */
1386         while (remove_file_array(remove_files, exclude_files))
1387                 continue;
1388         free_array(exclude_files);
1389         free_array(remove_files);
1390
1391         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
1392         exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
1393         exclude_files[0] = xstrdup(conffile_name);
1394         exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1395
1396         /* Create a list of all /var/lib/dpkg/info/<package> files */
1397         remove_files = all_control_list(package_name);
1398
1399         remove_file_array(remove_files, exclude_files);
1400         free_array(remove_files);
1401         free_array(exclude_files);
1402
1403         /* rename <package>.conffiles to <package>.list
1404          * The conffiles control file isn't required in Debian packages, so don't
1405          * error out if it's missing.  */
1406         rename(conffile_name, list_name);
1407
1408         /* Change package status */
1409         set_status(status_num, "config-files", 3);
1410 }
1411
1412 static void purge_package(const unsigned package_num)
1413 {
1414         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1415         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1416         const unsigned status_num = search_status_hashtable(package_name);
1417         char **remove_files;
1418         char **exclude_files;
1419         char list_name[strlen(package_name) + 25];
1420
1421         printf("Purging %s (%s)...\n", package_name, package_version);
1422
1423         /* Run prerm script */
1424         run_package_script_or_die(package_name, "prerm");
1425
1426         /* Create a list of files to remove */
1427         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1428         remove_files = create_list(list_name);
1429
1430         /* Some directories cant be removed straight away, so do multiple passes */
1431         while (remove_file_array(remove_files, NULL))
1432                 continue;
1433         free_array(remove_files);
1434
1435         /* Create a list of all /var/lib/dpkg/info/<package> files */
1436         remove_files = all_control_list(package_name);
1437
1438         /* Delete all of them except the postrm script */
1439         exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
1440         exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1441         remove_file_array(remove_files, exclude_files);
1442         free_array(exclude_files);
1443
1444         /* Run and remove postrm script */
1445         run_package_script_or_die(package_name, "postrm");
1446         remove_file_array(remove_files, NULL);
1447
1448         free_array(remove_files);
1449
1450         /* Change package status */
1451         set_status(status_num, "not-installed", 3);
1452 }
1453
1454 static archive_handle_t *init_archive_deb_ar(const char *filename)
1455 {
1456         archive_handle_t *ar_handle;
1457
1458         /* Setup an ar archive handle that refers to the gzip sub archive */
1459         ar_handle = init_handle();
1460         ar_handle->filter = filter_accept_list_reassign;
1461         ar_handle->src_fd = xopen(filename, O_RDONLY);
1462
1463         return ar_handle;
1464 }
1465
1466 static void init_archive_deb_control(archive_handle_t *ar_handle)
1467 {
1468         archive_handle_t *tar_handle;
1469
1470         /* Setup the tar archive handle */
1471         tar_handle = init_handle();
1472         tar_handle->src_fd = ar_handle->src_fd;
1473
1474         /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1475         llist_add_to(&(ar_handle->accept), (char*)"control.tar");
1476 #if ENABLE_FEATURE_SEAMLESS_GZ
1477         llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1478 #endif
1479 #if ENABLE_FEATURE_SEAMLESS_BZ2
1480         llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1481 #endif
1482 #if ENABLE_FEATURE_SEAMLESS_XZ
1483         llist_add_to(&(ar_handle->accept), (char*)"control.tar.xz");
1484 #endif
1485
1486         /* Assign the tar handle as a subarchive of the ar handle */
1487         ar_handle->dpkg__sub_archive = tar_handle;
1488 }
1489
1490 static void init_archive_deb_data(archive_handle_t *ar_handle)
1491 {
1492         archive_handle_t *tar_handle;
1493
1494         /* Setup the tar archive handle */
1495         tar_handle = init_handle();
1496         tar_handle->src_fd = ar_handle->src_fd;
1497
1498         /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1499         llist_add_to(&(ar_handle->accept), (char*)"data.tar");
1500 #if ENABLE_FEATURE_SEAMLESS_GZ
1501         llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1502 #endif
1503 #if ENABLE_FEATURE_SEAMLESS_BZ2
1504         llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1505 #endif
1506 #if ENABLE_FEATURE_SEAMLESS_LZMA
1507         llist_add_to(&(ar_handle->accept), (char*)"data.tar.lzma");
1508 #endif
1509 #if ENABLE_FEATURE_SEAMLESS_XZ
1510         llist_add_to(&(ar_handle->accept), (char*)"data.tar.xz");
1511 #endif
1512
1513         /* Assign the tar handle as a subarchive of the ar handle */
1514         ar_handle->dpkg__sub_archive = tar_handle;
1515 }
1516
1517 static void FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
1518 {
1519         unsigned size = archive_handle->file_header->size;
1520
1521         archive_handle->dpkg__buffer = xzalloc(size + 1);
1522         xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
1523 }
1524
1525 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1526 {
1527         ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
1528         ar_handle->dpkg__sub_archive->accept = myaccept;
1529         ar_handle->dpkg__sub_archive->filter = filter_accept_list;
1530
1531         unpack_ar_archive(ar_handle);
1532         close(ar_handle->src_fd);
1533
1534         return ar_handle->dpkg__sub_archive->dpkg__buffer;
1535 }
1536
1537 static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
1538 {
1539         FILE *fp;
1540         char *filename, *line;
1541
1542         filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
1543         fp = fopen_for_read(filename);
1544         free(filename);
1545         if (fp != NULL) {
1546                 while ((line = xmalloc_fgetline(fp)) != NULL)
1547                         llist_add_to(ll, line);
1548                 fclose(fp);
1549         }
1550 }
1551
1552 static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
1553 {
1554         int fd;
1555         char *name_ptr = archive_handle->file_header->name + 1;
1556
1557         /* Is this file marked as config file? */
1558         if (!find_list_entry(archive_handle->accept, name_ptr))
1559                 return EXIT_SUCCESS; /* no */
1560
1561         fd = open(name_ptr, O_RDONLY);
1562         if (fd >= 0) {
1563                 md5_ctx_t md5;
1564                 char *md5line, *buf;
1565                 int count;
1566
1567                 /* Calculate MD5 of existing file */
1568                 buf = xmalloc(4096);
1569                 md5_begin(&md5);
1570                 while ((count = safe_read(fd, buf, 4096)) > 0)
1571                         md5_hash(&md5, buf, count);
1572                 md5_end(&md5, buf); /* using buf as result storage */
1573                 close(fd);
1574
1575                 md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
1576                 sprintf(bin2hex(md5line, buf, 16), "  %s", name_ptr);
1577                 free(buf);
1578
1579                 /* Is it changed after install? */
1580                 if (find_list_entry(archive_handle->accept, md5line) == NULL) {
1581                         printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
1582                         archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
1583                 }
1584                 free(md5line);
1585         }
1586         return EXIT_SUCCESS;
1587 }
1588
1589 static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1590 {
1591         char *name_ptr = archive_handle->file_header->name;
1592
1593         /* Skip all leading "/" */
1594         while (*name_ptr == '/')
1595                 name_ptr++;
1596         /* Skip all leading "./" and "../" */
1597         while (name_ptr[0] == '.') {
1598                 if (name_ptr[1] == '.')
1599                         name_ptr++;
1600                 if (name_ptr[1] != '/')
1601                         break;
1602                 name_ptr += 2;
1603         }
1604
1605         if (name_ptr[0] != '\0') {
1606                 archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
1607                 data_extract_all(archive_handle);
1608                 if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
1609                         /* remove .dpkg-new suffix */
1610                         archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
1611                 }
1612         }
1613 }
1614
1615 enum {
1616         /* Commands */
1617         OPT_configure            = (1 << 0),
1618         OPT_install              = (1 << 1),
1619         OPT_list_installed       = (1 << 2),
1620         OPT_purge                = (1 << 3),
1621         OPT_remove               = (1 << 4),
1622         OPT_unpack               = (1 << 5),
1623         OPTMASK_cmd              = (1 << 6) - 1,
1624         /* Options */
1625         OPT_force                = (1 << 6),
1626         OPT_force_ignore_depends = (1 << 7),
1627         OPT_force_confnew        = (1 << 8),
1628         OPT_force_confold        = (1 << 9),
1629 };
1630
1631 static void unpack_package(deb_file_t *deb_file)
1632 {
1633         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1634         const unsigned status_num = search_status_hashtable(package_name);
1635         const unsigned status_package_num = status_hashtable[status_num]->package;
1636         char *info_prefix;
1637         char *list_filename;
1638         archive_handle_t *archive_handle;
1639         FILE *out_stream;
1640         llist_t *accept_list;
1641         llist_t *conffile_list;
1642         int i;
1643
1644         /* If existing version, remove it first */
1645         conffile_list = NULL;
1646         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1647                 /* Package is already installed, remove old version first */
1648                 printf("Preparing to replace %s %s (using %s)...\n", package_name,
1649                         name_hashtable[package_hashtable[status_package_num]->version],
1650                         deb_file->filename);
1651
1652                 /* Read md5sums from old package */
1653                 if (!(option_mask32 & OPT_force_confold))
1654                         append_control_file_to_llist(package_name, "md5sums", &conffile_list);
1655
1656                 remove_package(status_package_num, 0);
1657         } else {
1658                 printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1659         }
1660
1661         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1662         info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1663         archive_handle = init_archive_deb_ar(deb_file->filename);
1664         init_archive_deb_control(archive_handle);
1665
1666         accept_list = NULL;
1667         i = 0;
1668         while (i < ARRAY_SIZE(all_control_files)) {
1669                 char *c = xasprintf("./%s", all_control_files[i]);
1670                 llist_add_to(&accept_list, c);
1671                 i++;
1672         }
1673         archive_handle->dpkg__sub_archive->accept = accept_list;
1674         archive_handle->dpkg__sub_archive->filter = filter_accept_list;
1675         archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1676         archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
1677         archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1678         unpack_ar_archive(archive_handle);
1679
1680         /* Run the preinst prior to extracting */
1681         run_package_script_or_die(package_name, "preinst");
1682
1683         /* Don't overwrite existing config files */
1684         if (!(option_mask32 & OPT_force_confnew))
1685                 append_control_file_to_llist(package_name, "conffiles", &conffile_list);
1686
1687         /* Extract data.tar.gz to the root directory */
1688         archive_handle = init_archive_deb_ar(deb_file->filename);
1689         init_archive_deb_data(archive_handle);
1690         archive_handle->dpkg__sub_archive->accept = conffile_list;
1691         /* Why ARCHIVE_REMEMBER_NAMES?
1692          * We want names collected in ->passed list even if conffile_list
1693          * is NULL (otherwise get_header_tar may optimize name saving out):
1694          */
1695         archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_REMEMBER_NAMES | ARCHIVE_UNLINK_OLD;
1696         archive_handle->dpkg__sub_archive->filter = filter_rename_config;
1697         archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1698         archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
1699         unpack_ar_archive(archive_handle);
1700
1701         /* Create the list file */
1702         list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1703         out_stream = xfopen_for_write(list_filename);
1704         archive_handle->dpkg__sub_archive->passed = llist_rev(archive_handle->dpkg__sub_archive->passed);
1705         while (archive_handle->dpkg__sub_archive->passed) {
1706                 char *filename = llist_pop(&archive_handle->dpkg__sub_archive->passed);
1707                 /* the leading . has been stripped by data_extract_all_prefix already */
1708                 fprintf(out_stream, "%s\n", filename);
1709                 free(filename);
1710         }
1711         fclose(out_stream);
1712
1713         /* change status */
1714         set_status(status_num, "install", 1);
1715         set_status(status_num, "unpacked", 3);
1716
1717         free(info_prefix);
1718         free(list_filename);
1719 }
1720
1721 static void configure_package(deb_file_t *deb_file)
1722 {
1723         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1724         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1725         const int status_num = search_status_hashtable(package_name);
1726
1727         printf("Setting up %s (%s)...\n", package_name, package_version);
1728
1729         /* Run the postinst script */
1730         /* TODO: handle failure gracefully */
1731         run_package_script_or_die(package_name, "postinst");
1732
1733         /* Change status to reflect success */
1734         set_status(status_num, "install", 1);
1735         set_status(status_num, "installed", 3);
1736 }
1737
1738 int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1739 int dpkg_main(int argc UNUSED_PARAM, char **argv)
1740 {
1741         deb_file_t **deb_file = NULL;
1742         status_node_t *status_node;
1743         char *str_f;
1744         int opt;
1745         int package_num;
1746         int deb_count = 0;
1747         int state_status;
1748         int status_num;
1749         int i;
1750 #if ENABLE_LONG_OPTS
1751         static const char dpkg_longopts[] ALIGN1 =
1752 // FIXME: we use -C non-compatibly, should be:
1753 // "-C|--audit Check for broken package(s)"
1754                 "configure\0"      No_argument        "C"
1755                 "force\0"          Required_argument  "F"
1756                 "install\0"        No_argument        "i"
1757                 "list\0"           No_argument        "l"
1758                 "purge\0"          No_argument        "P"
1759                 "remove\0"         No_argument        "r"
1760                 "unpack\0"         No_argument        "u"
1761                 "force-depends\0"  No_argument        "\xff"
1762                 "force-confnew\0"  No_argument        "\xfe"
1763                 "force-confold\0"  No_argument        "\xfd"
1764                 ;
1765 #endif
1766
1767         INIT_G();
1768
1769         opt = getopt32long(argv, "CilPruF:", dpkg_longopts, &str_f);
1770         argv += optind;
1771         //if (opt & OPT_configure) ... // -C
1772         if (opt & OPT_force) { // -F (--force in official dpkg)
1773                 if (strcmp(str_f, "depends") == 0)
1774                         opt |= OPT_force_ignore_depends;
1775                 else if (strcmp(str_f, "confnew") == 0)
1776                         opt |= OPT_force_confnew;
1777                 else if (strcmp(str_f, "confold") == 0)
1778                         opt |= OPT_force_confold;
1779                 else
1780                         bb_show_usage();
1781                 option_mask32 = opt;
1782         }
1783         //if (opt & OPT_install) ... // -i
1784         //if (opt & OPT_list_installed) ... // -l
1785         //if (opt & OPT_purge) ... // -P
1786         //if (opt & OPT_remove) ... // -r
1787         //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1788         if (!(opt & OPTMASK_cmd) /* no cmd */
1789          || ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
1790         ) {
1791                 bb_show_usage();
1792         }
1793
1794 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1795         index_status_file("/var/lib/dpkg/status");
1796
1797         /* if the list action was given print the installed packages and exit */
1798         if (opt & OPT_list_installed) {
1799                 list_packages(argv[0]); /* param can be NULL */
1800                 return EXIT_SUCCESS;
1801         }
1802
1803         /* Read arguments and store relevant info in structs */
1804         while (*argv) {
1805                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1806                 deb_file = xrealloc_vector(deb_file, 2, deb_count);
1807                 deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1808                 if (opt & (OPT_install | OPT_unpack)) {
1809                         /* -i/-u: require filename */
1810                         archive_handle_t *archive_handle;
1811                         llist_t *control_list = NULL;
1812
1813                         /* Extract the control file */
1814                         llist_add_to(&control_list, (char*)"./control");
1815                         archive_handle = init_archive_deb_ar(argv[0]);
1816                         init_archive_deb_control(archive_handle);
1817                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1818                         if (deb_file[deb_count]->control_file == NULL) {
1819                                 bb_error_msg_and_die("can't extract control file");
1820                         }
1821                         deb_file[deb_count]->filename = xstrdup(argv[0]);
1822                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1823
1824                         if (package_num == -1) {
1825                                 bb_error_msg("invalid control file in %s", argv[0]);
1826                                 argv++;
1827                                 continue;
1828                         }
1829                         deb_file[deb_count]->package = (unsigned) package_num;
1830
1831                         /* Add the package to the status hashtable */
1832                         if (opt & (OPT_unpack | OPT_install)) {
1833                                 /* Try and find a currently installed version of this package */
1834                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1835                                 /* If no previous entry was found initialise a new entry */
1836                                 if (status_hashtable[status_num] == NULL
1837                                  || status_hashtable[status_num]->status == 0
1838                                 ) {
1839                                         status_node = xmalloc(sizeof(status_node_t));
1840                                         status_node->package = deb_file[deb_count]->package;
1841                                         /* reinstreq isn't changed to "ok" until the package control info
1842                                          * is written to the status file*/
1843                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1844                                         status_hashtable[status_num] = status_node;
1845                                 } else {
1846                                         set_status(status_num, "install", 1);
1847                                         set_status(status_num, "reinstreq", 2);
1848                                 }
1849                         }
1850                 } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1851                         /* -C/-p/-r: require package name */
1852                         deb_file[deb_count]->package = search_package_hashtable(
1853                                         search_name_hashtable(argv[0]),
1854                                         search_name_hashtable("ANY"), VER_ANY);
1855                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1856                                 bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1857                         }
1858                         package_num = deb_file[deb_count]->package;
1859                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1860                         state_status = get_status(status_num, 3);
1861
1862                         /* check package status is "installed" */
1863                         if (opt & OPT_remove) {
1864                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0
1865                                  || strcmp(name_hashtable[state_status], "config-files") == 0
1866                                 ) {
1867                                         bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1868                                 }
1869                                 set_status(status_num, "deinstall", 1);
1870                         } else if (opt & OPT_purge) {
1871                                 /* if package status is "conf-files" then its ok */
1872                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1873                                         bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1874                                 }
1875                                 set_status(status_num, "purge", 1);
1876                         }
1877                 }
1878                 deb_count++;
1879                 argv++;
1880         }
1881         if (!deb_count)
1882                 bb_error_msg_and_die("no package files specified");
1883         deb_file[deb_count] = NULL;
1884
1885         /* Check that the deb file arguments are installable */
1886         if (!(opt & OPT_force_ignore_depends)) {
1887                 if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1888                         bb_error_msg_and_die("dependency check failed");
1889                 }
1890         }
1891
1892         /* TODO: install or remove packages in the correct dependency order */
1893         for (i = 0; i < deb_count; i++) {
1894                 /* Remove or purge packages */
1895                 if (opt & OPT_remove) {
1896                         remove_package(deb_file[i]->package, 1);
1897                 }
1898                 else if (opt & OPT_purge) {
1899                         purge_package(deb_file[i]->package);
1900                 }
1901                 else if (opt & OPT_unpack) {
1902                         unpack_package(deb_file[i]);
1903                 }
1904                 else if (opt & OPT_install) {
1905                         unpack_package(deb_file[i]);
1906                         /* package is configured in second pass below */
1907                 }
1908                 else if (opt & OPT_configure) {
1909                         configure_package(deb_file[i]);
1910                 }
1911         }
1912         /* configure installed packages */
1913         if (opt & OPT_install) {
1914                 for (i = 0; i < deb_count; i++)
1915                         configure_package(deb_file[i]);
1916         }
1917
1918         write_status_file(deb_file);
1919
1920         if (ENABLE_FEATURE_CLEAN_UP) {
1921                 for (i = 0; i < deb_count; i++) {
1922                         free(deb_file[i]->control_file);
1923                         free(deb_file[i]->filename);
1924                         free(deb_file[i]);
1925                 }
1926
1927                 free(deb_file);
1928
1929                 for (i = 0; i < NAME_HASH_PRIME; i++) {
1930                         free(name_hashtable[i]);
1931                 }
1932
1933                 for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1934                         free_package(package_hashtable[i]);
1935                 }
1936
1937                 for (i = 0; i < STATUS_HASH_PRIME; i++) {
1938                         free(status_hashtable[i]);
1939                 }
1940         }
1941
1942         return EXIT_SUCCESS;
1943 }