ipkg_remove.c

   1 /* ipkg_remove.c - the itsy package management system
   2
   3    Carl D. Worth
   4
   5    Copyright (C) 2001 University of Southern California
   6
   7    This program is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU General Public License as
   9    published by the Free Software Foundation; either version 2, or (at
  10    your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16 */
  17
  18 #include "ipkg.h"
  19 #include "ipkg_message.h"
  20
  21 #include <glob.h>
  22
  23 #include "ipkg_remove.h"
  24
  25 #include "file_util.h"
  26 #include "sprintf_alloc.h"
  27 #include "str_util.h"
  28
  29 #include "ipkg_cmd.h"
  30
  31 /*
  32  * Returns number of the number of packages depending on the packages provided by this package.
  33  * Every package implicitly provides itself.
  34  */
  35 int pkg_has_installed_dependents(ipkg_conf_t *conf, abstract_pkg_t *parent_apkg, pkg_t *pkg, abstract_pkg_t *** pdependents)
  36 {
  37      int nprovides = pkg->provides_count;
  38      abstract_pkg_t **provides = pkg->provides;
  39      int n_installed_dependents = 0;
  40      int i;
  41      for (i = 0; i <= nprovides; i++) {
  42           abstract_pkg_t *providee = provides[i];
  43           abstract_pkg_t **dependers = providee->depended_upon_by;
  44           abstract_pkg_t *dep_ab_pkg;
  45           if (dependers == NULL)
  46                continue;
  47           while ((dep_ab_pkg = *dependers++) != NULL) {
  48                if (dep_ab_pkg->state_status == SS_INSTALLED){
  49                     n_installed_dependents++;
  50                }
  51           }
  52
  53      }
  54      /* if caller requested the set of installed dependents */
  55      if (pdependents) {
  56           int p = 0;
  57           abstract_pkg_t **dependents = (abstract_pkg_t **)malloc((n_installed_dependents+1)*sizeof(abstract_pkg_t *));
  58
  59           if ( dependents == NULL ){
  60               fprintf(stderr,"%s Unable to allocate memory. REPORT THIS BUG IN BUGZILLA PLEASE\n", __FUNCTION__);
  61               return -1;
  62           }
  63
  64           *pdependents = dependents;
  65           for (i = 0; i <= nprovides; i++) {
  66                abstract_pkg_t *providee = provides[i];
  67                abstract_pkg_t **dependers = providee->depended_upon_by;
  68                abstract_pkg_t *dep_ab_pkg;
  69                if (dependers == NULL)
  70                     continue;
  71                while ((dep_ab_pkg = *dependers++) != NULL) {
  72                     if (dep_ab_pkg->state_status == SS_INSTALLED && !(dep_ab_pkg->state_flag & SF_MARKED)) {
  73                          dependents[p++] = dep_ab_pkg;
  74                          dep_ab_pkg->state_flag |= SF_MARKED;
  75                     }
  76                }
  77           }
  78           dependents[p] = NULL;
  79           /* now clear the marks */
  80           for (i = 0; i < p; i++) {
  81                abstract_pkg_t *dep_ab_pkg = dependents[i];
  82                dep_ab_pkg->state_flag &= ~SF_MARKED;
  83           }
  84      }
  85      return n_installed_dependents;
  86 }
  87
  88 int ipkg_remove_dependent_pkgs (ipkg_conf_t *conf, pkg_t *pkg, abstract_pkg_t **dependents)
  89 {
  90     int i;
  91     int a;
  92     int count;
  93     pkg_vec_t *dependent_pkgs = pkg_vec_alloc();
  94     abstract_pkg_t * ab_pkg;
  95
  96     if((ab_pkg = pkg->parent) == NULL){
  97         fprintf(stderr, "%s: unable to get dependent pkgs. pkg %s isn't in hash table\n",
  98                 __FUNCTION__, pkg->name);
  99         return 0;
 100     }
 101
 102     if (dependents == NULL)
 103             return 0;
 104
 105     // here i am using the dependencies_checked
 106     if (ab_pkg->dependencies_checked == 2) // variable to make out whether this package
 107         return 0;                          // has already been encountered in the process
 108                                            // of marking packages for removal - Karthik
 109     ab_pkg->dependencies_checked = 2;
 110
 111     i = 0;
 112     count = 1;
 113     while (dependents [i] != NULL) {
 114         abstract_pkg_t *dep_ab_pkg = dependents[i];
 115
 116         if (dep_ab_pkg->dependencies_checked == 2){
 117             i++;
 118             continue;
 119         }
 120         if (dep_ab_pkg->state_status == SS_INSTALLED) {
 121             for (a = 0; a < dep_ab_pkg->pkgs->len; a++) {
 122                 pkg_t *dep_pkg = dep_ab_pkg->pkgs->pkgs[a];
 123                 if (dep_pkg->state_status == SS_INSTALLED) {
 124                     pkg_vec_insert(dependent_pkgs, dep_pkg);
 125                     count++;
 126                 }
 127             }
 128         }
 129         i++;
 130         /* 1 - to keep track of visited ab_pkgs when checking for possiblility of a broken removal of pkgs.
 131          * 2 - to keep track of pkgs whose deps have been checked alrdy  - Karthik */
 132     }
 133
 134     if (count == 1)
 135             return 0;
 136
 137
 138     for (i = 0; i < dependent_pkgs->len; i++) {
 139         int err = ipkg_remove_pkg(conf, dependent_pkgs->pkgs[i],0);
 140         if (err)
 141             return err;
 142     }
 143     return 0;
 144 }
 145
 146 static int user_prefers_removing_dependents(ipkg_conf_t *conf, abstract_pkg_t *abpkg, pkg_t *pkg, abstract_pkg_t **dependents)
 147 {
 148     abstract_pkg_t *dep_ab_pkg;
 149     ipkg_message(conf, IPKG_ERROR, "Package %s is depended upon by packages:\n", pkg->name);
 150     while ((dep_ab_pkg = *dependents++) != NULL) {
 151          if (dep_ab_pkg->state_status == SS_INSTALLED)
 152               ipkg_message(conf, IPKG_ERROR, "\t%s\n", dep_ab_pkg->name);
 153     }
 154     ipkg_message(conf, IPKG_ERROR, "These might cease to work if package %s is removed.\n\n", pkg->name);
 155     ipkg_message(conf, IPKG_ERROR, "");
 156     ipkg_message(conf, IPKG_ERROR, "You can force removal of this package with -force-depends.\n");
 157     ipkg_message(conf, IPKG_ERROR, "You can force removal of this package and its dependents\n");
 158     ipkg_message(conf, IPKG_ERROR, "with -force-removal-of-dependent-packages or -recursive\n");
 159     ipkg_message(conf, IPKG_ERROR, "or by setting option force_removal_of_dependent_packages\n");
 160     ipkg_message(conf, IPKG_ERROR, "in ipkg.conf.\n");
 161     return 0;
 162 }
 163
 164 int ipkg_remove_pkg(ipkg_conf_t *conf, pkg_t *pkg,int message)
 165 {
 166 /* Actually, when "message == 1" I have been called from an upgrade, and not from a normal remove
 167    thus I wan't check for essential, as I'm upgrading.
 168    I hope it won't break anything :)
 169 */
 170      int err;
 171      abstract_pkg_t *parent_pkg = NULL;
 172
 173      if (pkg->essential && !message) {
 174           if (conf->force_removal_of_essential_packages) {
 175                fprintf(stderr, "WARNING: Removing essential package %s under your coercion.\n"
 176                        "\tIf your system breaks, you get to keep both pieces\n",
 177                        pkg->name);
 178           } else {
 179                fprintf(stderr, "ERROR: Refusing to remove essential package %s.\n"
 180                        "\tRemoving an essential package may lead to an unusable system, but if\n"
 181                        "\tyou enjoy that kind of pain, you can force ipkg to proceed against\n"
 182                        "\tits will with the option: -force-removal-of-essential-packages\n",
 183                        pkg->name);
 184                return IPKG_PKG_IS_ESSENTIAL;
 185           }
 186      }
 187
 188      if ((parent_pkg = pkg->parent) == NULL)
 189           return 0;
 190
 191      /* only attempt to remove dependent installed packages if
 192       * force_depends is not specified or the package is being
 193       * replaced.
 194       */
 195      if (!conf->force_depends
 196          && !(pkg->state_flag & SF_REPLACE)) {
 197           abstract_pkg_t **dependents;
 198           int has_installed_dependents =
 199                pkg_has_installed_dependents(conf, parent_pkg, pkg, &dependents);
 200
 201           if (has_installed_dependents) {
 202                /*
 203                 * if this package is depended up by others, then either we should
 204                 * not remove it or we should remove it and all of its dependents
 205                 */
 206
 207                if (!conf->force_removal_of_dependent_packages
 208                    && !user_prefers_removing_dependents(conf, parent_pkg, pkg, dependents)) {
 209                     return IPKG_PKG_HAS_DEPENDENTS;
 210                }
 211
 212                /* remove packages depending on this package - Karthik */
 213                err = ipkg_remove_dependent_pkgs (conf, pkg, dependents);
 214                free(dependents);
 215                if (err) return err;
 216           }
 217      }
 218
 219      if ( message==0 ){
 220          printf("Removing package %s from %s...\n", pkg->name, pkg->dest->name);
 221          fflush(stdout);
 222      }
 223      pkg->state_flag |= SF_FILELIST_CHANGED;
 224
 225      pkg->state_want = SW_DEINSTALL;
 226      ipkg_state_changed++;
 227
 228      pkg_run_script(conf, pkg, "prerm", "remove");
 229
 230      /* DPKG_INCOMPATIBILITY: dpkg is slightly different here. It
 231         maintains an empty filelist rather than deleting it. That seems
 232         like a big pain, and I don't see that that should make a big
 233         difference, but for anyone who wants tighter compatibility,
 234         feel free to fix this. */
 235      remove_data_files_and_list(conf, pkg);
 236
 237      pkg_run_script(conf, pkg, "postrm", "remove");
 238
 239      remove_maintainer_scripts_except_postrm(conf, pkg);
 240
 241      /* Aman Gupta - Since ipkg is made for handheld devices with limited
 242       * space, it doesn't make sense to leave extra configurations, files,
 243       * and maintainer scripts left around. So, we make remove like purge,
 244       * and take out all the crap :) */
 245
 246      remove_postrm(conf, pkg);
 247      pkg->state_status = SS_NOT_INSTALLED;
 248
 249      if (parent_pkg)
 250           parent_pkg->state_status = SS_NOT_INSTALLED;
 251
 252      return 0;
 253 }
 254
 255 int ipkg_purge_pkg(ipkg_conf_t *conf, pkg_t *pkg)
 256 {
 257     ipkg_remove_pkg(conf, pkg,0);
 258     return 0;
 259 }
 260
 261 int remove_data_files_and_list(ipkg_conf_t *conf, pkg_t *pkg)
 262 {
 263      str_list_t installed_dirs;
 264      str_list_t *installed_files;
 265      str_list_elt_t *iter;
 266      char *file_name;
 267      conffile_t *conffile;
 268      int removed_a_dir;
 269      pkg_t *owner;
 270
 271      str_list_init(&installed_dirs);
 272      installed_files = pkg_get_installed_files(pkg);
 273
 274      for (iter = installed_files->head; iter; iter = iter->next) {
 275           file_name = iter->data;
 276
 277           if (file_is_dir(file_name)) {
 278                str_list_append(&installed_dirs, strdup(file_name));
 279                continue;
 280           }
 281
 282           conffile = pkg_get_conffile(pkg, file_name);
 283           if (conffile) {
 284                /* XXX: QUESTION: Is this right? I figure we only need to
 285                   save the conffile if it has been modified. Is that what
 286                   dpkg does? Or does dpkg preserve all conffiles? If so,
 287                   this seems like a better thing to do to conserve
 288                   space. */
 289                if (conffile_has_been_modified(conf, conffile)) {
 290                     printf("  not deleting modified conffile %s\n", file_name);
 291                     fflush(stdout);
 292                     continue;
 293                }
 294           }
 295
 296           ipkg_message(conf, IPKG_INFO, "  deleting %s (noaction=%d)\n", file_name, conf->noaction);
 297           if (!conf->noaction)
 298                unlink(file_name);
 299      }
 300
 301      if (!conf->noaction) {
 302           do {
 303                removed_a_dir = 0;
 304                for (iter = installed_dirs.head; iter; iter = iter->next) {
 305                     file_name = iter->data;
 306
 307                     if (rmdir(file_name) == 0) {
 308                          ipkg_message(conf, IPKG_INFO, "  deleting %s\n", file_name);
 309                          removed_a_dir = 1;
 310                          str_list_remove(&installed_dirs, &iter);
 311                     }
 312                }
 313           } while (removed_a_dir);
 314      }
 315
 316      pkg_free_installed_files(pkg);
 317      /* We have to remove the file list now, so that
 318         find_pkg_owning_file does not always just report this package */
 319      pkg_remove_installed_files_list(conf, pkg);
 320
 321      /* Don't print warning for dirs that are provided by other packages */
 322      for (iter = installed_dirs.head; iter; iter = iter->next) {
 323           file_name = iter->data;
 324
 325           owner = file_hash_get_file_owner(conf, file_name);
 326           if (owner) {
 327                free(iter->data);
 328                iter->data = NULL;
 329                str_list_remove(&installed_dirs, &iter);
 330           }
 331      }
 332
 333      /* cleanup */
 334      for (iter = installed_dirs.head; iter; iter = iter->next) {
 335           free(iter->data);
 336           iter->data = NULL;
 337      }
 338      str_list_deinit(&installed_dirs);
 339
 340      return 0;
 341 }
 342
 343 int remove_maintainer_scripts_except_postrm(ipkg_conf_t *conf, pkg_t *pkg)
 344 {
 345     int i, err;
 346     char *globpattern;
 347     glob_t globbuf;
 348
 349     if (conf->noaction) return 0;
 350
 351     sprintf_alloc(&globpattern, "%s/%s.*",
 352                   pkg->dest->info_dir, pkg->name);
 353     err = glob(globpattern, 0, NULL, &globbuf);
 354     free(globpattern);
 355     if (err) {
 356         return 0;
 357     }
 358
 359     for (i = 0; i < globbuf.gl_pathc; i++) {
 360         if (str_ends_with(globbuf.gl_pathv[i], ".postrm")) {
 361             continue;
 362         }
 363         ipkg_message(conf, IPKG_INFO, "  deleting %s\n", globbuf.gl_pathv[i]);
 364         unlink(globbuf.gl_pathv[i]);
 365     }
 366     globfree(&globbuf);
 367
 368     return 0;
 369 }
 370
 371 int remove_postrm(ipkg_conf_t *conf, pkg_t *pkg)
 372 {
 373     char *postrm_file_name;
 374
 375     if (conf->noaction) return 0;
 376
 377     sprintf_alloc(&postrm_file_name, "%s/%s.postrm",
 378                   pkg->dest->info_dir, pkg->name);
 379     unlink(postrm_file_name);
 380     free(postrm_file_name);
 381
 382     return 0;
 383 }