archival/dpkg.c

   1 #include <dirent.h>
   2 #include <getopt.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <search.h>
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <utime.h>
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13
  14 #include "busybox.h"
  15
  16
  17 #define DEPENDSMAX      64      /* maximum number of depends we can handle */
  18
  19 /* Should we do full dependency checking? */
  20 #define DODEPENDS 1
  21
  22 /* Should we do debugging? */
  23 #define DODEBUG 1
  24
  25 #ifdef DODEBUG
  26 #define SYSTEM(x) do_system(x)
  27 #define DPRINTF(fmt,args...) fprintf(stderr, fmt, ##args)
  28 #else
  29 #define SYSTEM(x) system(x)
  30 #define DPRINTF(fmt,args...) /* nothing */
  31 #endif
  32
  33 /* from dpkg-deb.c */
  34 extern int deb_extract(int optflags, const char *dir_name, const char *deb_filename);
  35 static const int dpkg_deb_contents = 1;
  36 static const int dpkg_deb_control = 2;
  37 //      const int dpkg_deb_info = 4;
  38 static const int dpkg_deb_extract = 8;
  39 static const int dpkg_deb_verbose_extract = 16;
  40 static const int dpkg_deb_list = 32;
  41
  42 static const char statusfile[] = "/var/lib/dpkg/status.udeb";
  43 static const char new_statusfile[] = "/var/lib/dpkg/status.udeb.new";
  44 static const char bak_statusfile[] = "/var/lib/dpkg/status.udeb.bak";
  45
  46 static const char dpkgcidir[] = "/var/lib/dpkg/tmp.ci/";
  47
  48 static const char infodir[] = "/var/lib/dpkg/info/";
  49 static const char udpkg_quiet[] = "UDPKG_QUIET";
  50
  51 //static const int status_wantstart     = 0;
  52 //static const int status_wantunknown   = (1 << 0);
  53 static const int status_wantinstall     = (1 << 1);
  54 //static const int status_wanthold      = (1 << 2);
  55 //static const int status_wantdeinstall = (1 << 3);
  56 //static const int status_wantpurge     = (1 << 4);
  57 static const int status_wantmask        = 31;
  58
  59 //static const int status_flagstart     = 5;
  60 static const int status_flagok  = (1 << 5);     /* 32 */
  61 //static const int status_flagreinstreq = (1 << 6);
  62 //static const int status_flaghold      = (1 << 7);
  63 //static const int status_flagholdreinstreq     = (1 << 8);
  64 static const int status_flagmask        = 480;
  65
  66 //static const int status_statusstart   = 9;
  67 //static const int status_statusnoninstalled    = (1 << 9); /* 512 */
  68 static const int status_statusunpacked  = (1 << 10);
  69 static const int status_statushalfconfigured    = (1 << 11);
  70 static const int status_statusinstalled = (1 << 12);
  71 static const int status_statushalfinstalled     = (1 << 13);
  72 //static const int status_statusconfigfiles     = (1 << 14);
  73 //static const int status_statuspostinstfailed  = (1 << 15);
  74 //static const int status_statusremovalfailed   = (1 << 16);
  75 static const int status_statusmask =  130560; /* i assume status_statusinstalled is supposed to be included */
  76
  77 static const char *statuswords[][10] = {
  78         { (char *) 0, "unknown", "install", "hold", "deinstall", "purge", 0 },
  79         { (char *) 5, "ok", "reinstreq", "hold", "hold-reinstreq", 0 },
  80         { (char *) 9, "not-installed", "unpacked", "half-configured",
  81                 "installed", "half-installed", "config-files",
  82                 "post-inst-failed", "removal-failed", 0 }
  83 };
  84
  85 static const int color_white    = 0;
  86 static const int color_grey     = 1;
  87 static const int color_black    = 2;
  88
  89 /* data structures */
  90 typedef struct package_s {
  91         char *file;
  92         char *package;
  93         char *version;
  94         char *depends;
  95         char *provides;
  96         char *description;
  97         int installer_menu_item;
  98         unsigned long status;
  99         char color; /* for topo-sort */
 100         struct package_s *requiredfor[DEPENDSMAX];
 101         unsigned short requiredcount;
 102         struct package_s *next;
 103 } package_t;
 104
 105 #ifdef DODEBUG
 106 static int do_system(const char *cmd)
 107 {
 108         DPRINTF("cmd is %s\n", cmd);
 109         return system(cmd);
 110 }
 111 #else
 112 #define do_system(cmd) system(cmd)
 113 #endif
 114
 115 static int package_compare(const void *p1, const void *p2)
 116 {
 117         return strcmp(((package_t *)p1)->package,
 118                 ((package_t *)p2)->package);
 119 }
 120
 121 /*
 122  * NOTE: this was handled by a "rm -rf" shell command
 123  * Maybe theis behaviour should be integrated into the rm applet
 124  * (i dont appreciate the rm applets recursive action fn)-bug1
 125  */
 126 static int remove_dir(const char *dirname)
 127 {
 128         struct dirent *fp;
 129         DIR *dp = opendir(dirname);
 130         while ((fp = readdir(dp)) != NULL) {
 131                 struct stat statbuf;
 132                 char *filename;
 133
 134                 filename = (char *) xcalloc(1, strlen(dirname) + strlen(fp->d_name) + 2);
 135                 strcpy(filename, dirname);
 136                 strcat(filename, fp->d_name);
 137                 lstat(filename, &statbuf);
 138
 139                 if ((strcmp(fp->d_name, ".") != 0) && (strcmp(fp->d_name, "..") != 0)) {
 140                         if (S_ISDIR(statbuf.st_mode)) {
 141                                 remove_dir(strcat(filename, "/"));
 142                         }
 143                         else if (remove(filename) == -1) {
 144                                 perror_msg(filename);
 145                         }
 146                 }
 147         }
 148         remove(dirname);
 149         return EXIT_SUCCESS;
 150 }
 151
 152 #ifdef DODEPENDS
 153 #include <ctype.h>
 154
 155 static char **depends_split(const char *dependsstr)
 156 {
 157         static char *dependsvec[DEPENDSMAX];
 158         char *p;
 159         int i = 0;
 160
 161         dependsvec[0] = 0;
 162         if (dependsstr == 0) {
 163                 goto end;
 164         }
 165
 166         p = xstrdup(dependsstr);
 167         while (*p != 0 && *p != '\n') {
 168                 if (*p != ' ') {
 169                         if (*p == ',') {
 170                                 *p = 0;
 171                                 dependsvec[++i] = 0;
 172                         } else {
 173                                 if (dependsvec[i] == 0) {
 174                                         dependsvec[i] = p;
 175                                 }
 176                         }
 177                 } else {
 178                         *p = 0; /* eat the space... */
 179                 }
 180                 p++;
 181         }
 182         *p = 0;
 183
 184 end:
 185         dependsvec[i+1] = 0;
 186         return dependsvec;
 187 }
 188
 189 /* Topological sort algorithm:
 190  * ordered is the output list, pkgs is the dependency graph, pkg is
 191  * the current node
 192  *
 193  * recursively add all the adjacent nodes to the ordered list, marking
 194  * each one as visited along the way
 195  *
 196  * yes, this algorithm looks a bit odd when all the params have the
 197  * same type :-)
 198  */
 199 static void depends_sort_visit(package_t **ordered, package_t *pkgs,
 200                 package_t *pkg)
 201 {
 202         unsigned short i;
 203
 204         /* mark node as processing */
 205         pkg->color = color_grey;
 206
 207         /* visit each not-yet-visited node */
 208         for (i = 0; i < pkg->requiredcount; i++)
 209                 if (pkg->requiredfor[i]->color == color_white)
 210                         depends_sort_visit(ordered, pkgs, pkg->requiredfor[i]);
 211
 212 #if 0
 213         /* add it to the list */
 214         newnode = (struct package_t *)xmalloc(sizeof(struct package_t));
 215         /* make a shallow copy */
 216         *newnode = *pkg;
 217         newnode->next = *ordered;
 218         *ordered = newnode;
 219 #endif
 220
 221         pkg->next = *ordered;
 222         *ordered = pkg;
 223
 224         /* mark node as done */
 225         pkg->color = color_black;
 226 }
 227
 228 static package_t *depends_sort(package_t *pkgs)
 229 {
 230         /* TODO: it needs to break cycles in the to-be-installed package
 231          * graph... */
 232         package_t *ordered = NULL;
 233         package_t *pkg;
 234
 235         for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
 236                 pkg->color = color_white;
 237         }
 238         for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
 239                 if (pkg->color == color_white) {
 240                         depends_sort_visit(&ordered, pkgs, pkg);
 241                 }
 242         }
 243
 244         /* Leaks the old list... return the new one... */
 245         return ordered;
 246 }
 247
 248
 249 /* resolve package dependencies --
 250  * for each package in the list of packages to be installed, we parse its
 251  * dependency info to determine if the dependent packages are either
 252  * already installed, or are scheduled to be installed. If both tests fail
 253  * than bail.
 254  *
 255  * The algorithm here is O(n^2*m) where n = number of packages to be
 256  * installed and m is the # of dependencies per package. Not a terribly
 257  * efficient algorithm, but given that at any one time you are unlikely
 258  * to install a very large number of packages it doesn't really matter
 259  */
 260 static package_t *depends_resolve(package_t *pkgs, void *status)
 261 {
 262         package_t *pkg, *chk;
 263         package_t dependpkg;
 264         char **dependsvec;
 265         int i;
 266         void *found;
 267
 268         for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
 269                 dependsvec = depends_split(pkg->depends);
 270                 i = 0;
 271                 while (dependsvec[i] != 0) {
 272                         /* Check for dependencies; first look for installed packages */
 273                         dependpkg.package = dependsvec[i];
 274                         if ((found = tfind(&dependpkg, &status, package_compare)) == 0 ||
 275                             ((chk = *(package_t **)found) &&
 276                              (chk->status & (status_flagok | status_statusinstalled)) !=
 277                               (status_flagok | status_statusinstalled))) {
 278
 279                                 /* if it fails, we look through the list of packages we are going to
 280                                  * install */
 281                                 for (chk = pkgs; chk != 0; chk = chk->next) {
 282                                         if (strcmp(chk->package, dependsvec[i]) == 0 || (chk->provides &&
 283                                              strncmp(chk->provides, dependsvec[i], strlen(dependsvec[i])) == 0)) {
 284                                                 if (chk->requiredcount >= DEPENDSMAX) {
 285                                                         fprintf(stderr, "Too many dependencies for %s\n", chk->package);
 286                                                         return 0;
 287                                                 }
 288                                                 if (chk != pkg) {
 289                                                         chk->requiredfor[chk->requiredcount++] = pkg;
 290                                                 }
 291                                                 break;
 292                                         }
 293                                 }
 294                                 if (chk == 0) {
 295                                         fprintf(stderr, "%s depends on %s, but it is not going to be installed\n", pkg->package, dependsvec[i]);
 296                                         return 0;
 297                                 }
 298                         }
 299                         i++;
 300                 }
 301         }
 302
 303         return depends_sort(pkgs);
 304 }
 305 #endif
 306
 307 /* Status file handling routines
 308  *
 309  * This is a fairly minimalistic implementation. there are two main functions
 310  * that are supported:
 311  *
 312  * 1) reading the entire status file:
 313  *    the status file is read into memory as a binary-tree, with just the
 314  *    package and status info preserved
 315  *
 316  * 2) merging the status file
 317  *    control info from (new) packages is merged into the status file,
 318  *    replacing any pre-existing entries. when a merge happens, status info
 319  *    read using the status_read function is written back to the status file
 320  */
 321 static unsigned long status_parse(const char *line)
 322 {
 323         char *p;
 324         int i, j;
 325         unsigned long l = 0;
 326
 327         for (i = 0; i < 3; i++) {
 328                 if ((p = strchr(line, ' ')) != NULL) {
 329                         *p = 0;
 330                 }
 331                 j = 1;
 332                 while (statuswords[i][j] != 0) {
 333                         if (strcmp(line, statuswords[i][j]) == 0) {
 334                                 l |= (1 << ((int)statuswords[i][0] + j - 1));
 335                                 break;
 336                         }
 337                         j++;
 338                 }
 339                 /* parse error */
 340                 if (statuswords[i][j] == 0) {
 341                         return 0;
 342                 }
 343                 line = p+1;
 344         }
 345
 346         return l;
 347 }
 348
 349 static const char *status_print(unsigned long flags)
 350 {
 351         /* this function returns a static buffer... */
 352         static char buf[256];
 353         int i, j;
 354
 355         buf[0] = 0;
 356         for (i = 0; i < 3; i++) {
 357                 j = 1;
 358                 while (statuswords[i][j] != 0) {
 359                         if ((flags & (1 << ((int)statuswords[i][0] + j - 1))) != 0)     {
 360                                 strcat(buf, statuswords[i][j]);
 361                                 if (i < 2) strcat(buf, " ");
 362                                 break;
 363                         }
 364                         j++;
 365                 }
 366                 if (statuswords[i][j] == 0) {
 367                         fprintf(stderr, "corrupted status flag!!\n");
 368                         return NULL;
 369                 }
 370         }
 371
 372         return buf;
 373 }
 374
 375 /*
 376  * Read a control file (or a stanza of a status file) and parse it,
 377  * filling parsed fields into the package structure
 378  */
 379 static int control_read(FILE *file, package_t *p)
 380 {
 381         char *line;
 382
 383         while ((line = get_line_from_file(file)) != NULL) {
 384                 line[strlen(line) - 1] = '\0';
 385
 386                 if (strlen(line) == 0) {
 387                         break;
 388                 } else
 389                         if (strstr(line, "Package: ") == line) {
 390                                 p->package = xstrdup(line + 9);
 391                 } else
 392                         if (strstr(line, "Status: ") == line) {
 393                                 p->status = status_parse(line + 8);
 394                 } else
 395                         if (strstr(line, "Depends: ") == line) {
 396                                 p->depends = xstrdup(line + 9);
 397                 } else
 398                         if (strstr(line, "Provides: ") == line) {
 399                                 p->provides = xstrdup(line + 10);
 400                 } else
 401                         if (strstr(line, "Description: ") == line) {
 402                                 p->description = xstrdup(line + 13);
 403                 /* This is specific to the Debian Installer. Ifdef? */
 404                 } else
 405                         if (strstr(line, "installer-menu-item: ") == line) {
 406                                 p->installer_menu_item = atoi(line + 21);
 407                 }
 408                 /* TODO: localized descriptions */
 409         }
 410         free(line);
 411         return EXIT_SUCCESS;
 412 }
 413
 414 static void *status_read(void)
 415 {
 416         FILE *f;
 417         void *status = 0;
 418         package_t *m = 0, *p = 0, *t = 0;
 419
 420         if ((f = fopen(statusfile, "r")) == NULL) {
 421                 perror_msg(statusfile);
 422                 return 0;
 423         }
 424
 425         if (getenv(udpkg_quiet) == NULL) {
 426                 printf("(Reading database...)\n");
 427         }
 428
 429         while (!feof(f)) {
 430                 m = (package_t *)xcalloc(1, sizeof(package_t));
 431                 control_read(f, m);
 432                 if (m->package) {
 433                         /*
 434                          * If there is an item in the tree by this name,
 435                          * it must be a virtual package; insert real
 436                          * package in preference.
 437                          */
 438                         tdelete(m, &status, package_compare);
 439                         tsearch(m, &status, package_compare);
 440                         if (m->provides) {
 441                                 /*
 442                                  * A "Provides" triggers the insertion
 443                                  * of a pseudo package into the status
 444                                  * binary-tree.
 445                                  */
 446                                 p = (package_t *)xcalloc(1, sizeof(package_t));
 447                                 p->package = xstrdup(m->provides);
 448
 449                                 t = *(package_t **)tsearch(p, &status, package_compare);
 450                                 if (t != p) {
 451                                         free(p->package);
 452                                         free(p);
 453                                 }
 454                                 else {
 455                                         /*
 456                                          * Pseudo package status is the
 457                                          * same as the status of the
 458                                          * package providing it
 459                                          * FIXME: (not quite right, if 2
 460                                          * packages of different statuses
 461                                          * provide it).
 462                                          */
 463                                         t->status = m->status;
 464                                 }
 465                         }
 466                 }
 467                 else {
 468                         free(m);
 469                 }
 470         }
 471         fclose(f);
 472         return status;
 473 }
 474
 475 static int status_merge(void *status, package_t *pkgs)
 476 {
 477         FILE *fin, *fout;
 478         char *line = NULL;
 479         package_t *pkg = 0, *statpkg = 0;
 480         package_t locpkg;
 481         int r = 0;
 482
 483         if ((fout = wfopen(new_statusfile, "w")) == NULL) {
 484                 return 0;
 485         }
 486         if (getenv(udpkg_quiet) == NULL) {
 487                 printf("(Updating database...)\n");
 488         }
 489         if ((fin = wfopen(statusfile, "r")) != NULL) {
 490                 while (((line = get_line_from_file(fin)) != NULL) && !feof(fin)) {
 491                         line[strlen(line) - 1] = '\0'; /* trim newline */
 492                         /* If we see a package header, find out if it's a package
 493                          * that we have processed. if so, we skip that block for
 494                          * now (write it at the end).
 495                          *
 496                          * we also look at packages in the status cache and update
 497                          * their status fields
 498                          */
 499                         if (strstr(line, "Package: ") == line) {
 500                                 for (pkg = pkgs; pkg != 0 && strcmp(line + 9,
 501                                                 pkg->package) != 0; pkg = pkg->next) ;
 502
 503                                 locpkg.package = line + 9;
 504                                 statpkg = tfind(&locpkg, &status, package_compare);
 505
 506                                 /* note: statpkg should be non-zero, unless the status
 507                                  * file was changed while we are processing (no locking
 508                                  * is currently done...
 509                                  */
 510                                 if (statpkg != 0) {
 511                                         statpkg = *(package_t **)statpkg;
 512                                 }
 513                         }
 514                         if (pkg != 0) {
 515                                 continue;
 516                         }
 517                         if (strstr(line, "Status: ") == line && statpkg != 0) {
 518                                 snprintf(line, sizeof(line), "Status: %s",
 519                                         status_print(statpkg->status));
 520                         }
 521                         fputs(line, fout);
 522                         fputc('\n', fout);
 523                 }
 524         }
 525         free(line);
 526
 527         // Print out packages we processed.
 528         for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
 529                 fprintf(fout, "Package: %s\nStatus: %s\n",
 530                         pkg->package, status_print(pkg->status));
 531                 if (pkg->depends)
 532                         fprintf(fout, "Depends: %s\n", pkg->depends);
 533                 if (pkg->provides)
 534                         fprintf(fout, "Provides: %s\n", pkg->provides);
 535                 if (pkg->installer_menu_item)
 536                         fprintf(fout, "installer-menu-item: %i\n", pkg->installer_menu_item);
 537                 if (pkg->description)
 538                         fprintf(fout, "Description: %s\n", pkg->description);
 539                 fputc('\n', fout);
 540         }
 541
 542         fclose(fin);
 543         fclose(fout);
 544
 545         r = rename(statusfile, bak_statusfile);
 546         if (r == 0) {
 547                 r = rename(new_statusfile, statusfile);
 548         }
 549
 550         return 0;
 551 }
 552
 553 static int is_file(const char *fn)
 554 {
 555         struct stat statbuf;
 556
 557         if (stat(fn, &statbuf) < 0) {
 558                 return 0;
 559         }
 560         return S_ISREG(statbuf.st_mode);
 561 }
 562
 563 static int dpkg_doconfigure(package_t *pkg)
 564 {
 565         int r;
 566         char postinst[1024];
 567         char buf[1024];
 568
 569         DPRINTF("Configuring %s\n", pkg->package);
 570         pkg->status &= status_statusmask;
 571         snprintf(postinst, sizeof(postinst), "%s%s.postinst", infodir, pkg->package);
 572
 573         if (is_file(postinst)) {
 574                 snprintf(buf, sizeof(buf), "%s configure", postinst);
 575                 if ((r = do_system(buf)) != 0) {
 576                         fprintf(stderr, "postinst exited with status %d\n", r);
 577                         pkg->status |= status_statushalfconfigured;
 578                         return 1;
 579                 }
 580         }
 581         pkg->status |= status_statusinstalled;
 582
 583         return 0;
 584 }
 585
 586 static int dpkg_dounpack(package_t *pkg)
 587 {
 588         int r = 0, i;
 589         char *cwd;
 590         char *src_file = NULL;
 591         char *dst_file = NULL;
 592 //      char *lst_file = NULL;
 593         char *adminscripts[] = { "prerm", "postrm", "preinst", "postinst",
 594                         "conffiles", "md5sums", "shlibs", "templates" };
 595
 596         DPRINTF("Unpacking %s\n", pkg->package);
 597
 598         cwd = getcwd(0, 0);
 599         chdir("/");
 600         deb_extract(dpkg_deb_extract, "/", pkg->file);
 601
 602         /* Installs the package scripts into the info directory */
 603         for (i = 0; i < sizeof(adminscripts) / sizeof(adminscripts[0]); i++) {
 604                 struct stat src_stat_buf;
 605                 int src_fd = 0, dst_fd = 0;
 606
 607                 /* The full path of the current location of the admin file */
 608                 src_file = xrealloc(src_file, strlen(dpkgcidir) + strlen(pkg->package) + strlen(adminscripts[i]) + 1);
 609                 sprintf(src_file, "%s%s/%s", dpkgcidir, pkg->package, adminscripts[i]);
 610
 611                 /* the full path of where we want the file to be copied to */
 612                 dst_file = xrealloc(dst_file, strlen(infodir) + strlen(pkg->package) + strlen(adminscripts[i]) + 1);
 613                 sprintf(dst_file, "%s%s.%s", infodir, pkg->package, adminscripts[i]);
 614
 615                 /*
 616                  * copy admin file to permanent home
 617                  * NOTE: Maybe merge this behaviour into libb/copy_file.c
 618                  */
 619                 if (lstat(src_file, &src_stat_buf) == 0) {
 620                         if ((src_fd = open(src_file, O_RDONLY)) != -1) {
 621                                 if ((dst_fd = open(dst_file, O_WRONLY | O_CREAT, 0644)) == -1) {
 622                                         perror_msg("Opening %s", dst_file);
 623                                 }
 624                                 copy_file_chunk(src_fd, dst_fd, src_stat_buf.st_size);
 625                                 close(src_fd);
 626                                 close(dst_fd);
 627                         } else {
 628                                 error_msg("couldnt open [%s]\n", src_file);
 629                         }
 630                 }
 631         }
 632
 633         /*
 634          * create the list file
 635          * FIXME: currently this dumps the lst to stdout instead of a file
 636          */
 637 /*      lst_file = (char *) xmalloc(strlen(infodir) + strlen(pkg->package) + 6);
 638         strcpy(lst_file, infodir);
 639         strcat(lst_file, pkg->package);
 640         strcat(lst_file, ".list");
 641         deb_extract(dpkg_deb_list, NULL, pkg->file);
 642 */
 643
 644         pkg->status &= status_wantmask;
 645         pkg->status |= status_wantinstall;
 646         pkg->status &= status_flagmask;
 647         pkg->status |= status_flagok;
 648         pkg->status &= status_statusmask;
 649
 650         if (r == 0) {
 651                 pkg->status |= status_statusunpacked;
 652         } else {
 653                 pkg->status |= status_statushalfinstalled;
 654         }
 655         chdir(cwd);
 656         return r;
 657 }
 658
 659 /*
 660  * Extract and parse the control.tar.gz from the specified package
 661  */
 662 static int dpkg_unpackcontrol(package_t *pkg)
 663 {
 664         char *tmp_name;
 665         FILE *file;
 666         int length;
 667
 668         /* clean the temp directory (dpkgcidir) be recreating it */
 669         remove_dir(dpkgcidir);
 670         if (mkdir(dpkgcidir, S_IRWXU) != 0) {
 671                 perror("mkdir");
 672                 return EXIT_FAILURE;
 673         }
 674
 675         /*
 676          * Get the package name from the file name,
 677          * first remove the directories
 678          */
 679         if ((tmp_name = strrchr(pkg->file, '/')) == NULL) {
 680                 tmp_name = pkg->file;
 681         } else {
 682                 tmp_name++;
 683         }
 684         /* now remove trailing version numbers etc */
 685         length = strcspn(tmp_name, "_.");
 686         pkg->package = (char *) xcalloc(1, length + 1);
 687         /* store the package name */
 688         strncpy(pkg->package, tmp_name, length);
 689
 690         /* work out the full extraction path */
 691         tmp_name = (char *) xcalloc(1, strlen(dpkgcidir) + strlen(pkg->package) + 9);
 692         strcpy(tmp_name, dpkgcidir);
 693         strcat(tmp_name, pkg->package);
 694
 695         /* extract control.tar.gz to the full extraction path */
 696         deb_extract(dpkg_deb_control, tmp_name, pkg->file);
 697
 698         /* parse the extracted control file */
 699         strcat(tmp_name, "/control");
 700         if ((file = wfopen(tmp_name, "r")) == NULL) {
 701                 return EXIT_FAILURE;
 702         }
 703         if (control_read(file, pkg) == EXIT_FAILURE) {
 704                 return EXIT_FAILURE;
 705         }
 706
 707         return EXIT_SUCCESS;
 708 }
 709
 710 static int dpkg_unpack(package_t *pkgs, void *status)
 711 {
 712         int r = 0;
 713         package_t *pkg;
 714
 715         for (pkg = pkgs; pkg != 0; pkg = pkg->next) {
 716                 if (dpkg_unpackcontrol(pkg) == EXIT_FAILURE) {
 717                         return EXIT_FAILURE;
 718                 }
 719                 if ((r = dpkg_dounpack(pkg)) != 0 ) {
 720                         break;
 721                 }
 722         }
 723         status_merge(status, pkgs);
 724         remove_dir(dpkgcidir);
 725
 726         return r;
 727 }
 728
 729 static int dpkg_configure(package_t *pkgs, void *status)
 730 {
 731         int r = 0;
 732         void *found;
 733         package_t *pkg;
 734
 735         for (pkg = pkgs; pkg != 0 && r == 0; pkg = pkg->next) {
 736                 found = tfind(pkg, &status, package_compare);
 737
 738                 if (found == 0) {
 739                         fprintf(stderr, "Trying to configure %s, but it is not installed\n", pkg->package);
 740                         r = 1;
 741                 }
 742                 /* configure the package listed in the status file;
 743                  * not pkg, as we have info only for the latter
 744                  */
 745                 else {
 746                         r = dpkg_doconfigure(*(package_t **)found);
 747                 }
 748         }
 749         status_merge(status, 0);
 750
 751         return r;
 752 }
 753
 754 static int dpkg_install(package_t *pkgs, void *status)
 755 {
 756         package_t *p, *ordered = 0;
 757
 758         /* Stage 1: parse all the control information */
 759         for (p = pkgs; p != 0; p = p->next) {
 760                 if (dpkg_unpackcontrol(p) == EXIT_FAILURE) {
 761                         return(EXIT_FAILURE);
 762                 }
 763         }
 764
 765         /* Stage 2: resolve dependencies */
 766 #ifdef DODEPENDS
 767         ordered = depends_resolve(pkgs, status);
 768 #else
 769         ordered = pkgs;
 770 #endif
 771
 772         /* Stage 3: install */
 773         for (p = ordered; p != 0; p = p->next) {
 774                 p->status &= status_wantmask;
 775                 p->status |= status_wantinstall;
 776
 777                 /* for now the flag is always set to ok... this is probably
 778                  * not what we want
 779                  */
 780                 p->status &= status_flagmask;
 781                 p->status |= status_flagok;
 782
 783                 DPRINTF("Installing %s\n", p->package);
 784                 if (dpkg_dounpack(p) != 0) {
 785                         perror_msg(p->file);
 786                 }
 787                 if (dpkg_doconfigure(p) != 0) {
 788                         perror_msg(p->file);
 789                 }
 790         }
 791
 792         if (ordered != 0) {
 793                 status_merge(status, pkgs);
 794         }
 795         remove_dir(dpkgcidir);
 796
 797         return 0;
 798 }
 799
 800 /*
 801  * Not implemented yet
 802  *
 803 static int dpkg_remove(package_t *pkgs, void *status)
 804 {
 805         package_t *p;
 806
 807         for (p = pkgs; p != 0; p = p->next)
 808         {
 809         }
 810         status_merge(status, 0);
 811
 812         return 0;
 813 }
 814 */
 815
 816 extern int dpkg_main(int argc, char **argv)
 817 {
 818         const int arg_install = 1;
 819         const int arg_unpack = 2;
 820         const int arg_configure = 4;
 821
 822         package_t *p, *packages = NULL;
 823         void *status = NULL;
 824         char opt = 0;
 825         int optflag = 0;
 826
 827         while ((opt = getopt(argc, argv, "iruc")) != -1) {
 828                 switch (opt) {
 829                         case 'i':
 830                                 optflag |= arg_install;
 831                                 break;
 832                         case 'u':
 833                                 optflag |= arg_unpack;
 834                                 break;
 835                         case 'c':
 836                                 optflag |= arg_configure;
 837                                 break;
 838                         default:
 839                                 show_usage();
 840                 }
 841         }
 842
 843         while (optind < argc) {
 844                 p = (package_t *) xcalloc(1, sizeof(package_t));
 845                 if (optflag & arg_configure) {
 846                         p->package = xstrdup(argv[optind]);
 847                 } else {
 848                         p->file = xstrdup(argv[optind]);
 849                 }
 850                 p->next = packages;
 851                 packages = p;
 852
 853                 optind++;
 854         }
 855
 856         create_path(dpkgcidir, 0755);
 857         create_path(infodir, 0755);
 858
 859         status = status_read();
 860
 861         if (optflag & arg_install) {
 862                 return dpkg_install(packages, status);
 863         }
 864         else if (optflag & arg_unpack) {
 865                 return dpkg_unpack(packages, status);
 866         }
 867         else if (optflag & arg_configure) {
 868                 return dpkg_configure(packages, status);
 869         }
 870         return(EXIT_FAILURE);
 871 }