summaryrefslogtreecommitdiffstats
path: root/libopkg/opkg_remove.c
blob: aadfa6aa6d4b9925775b978fba780fbf9c36d4f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
/* opkg_remove.c - the opkg package management system

   Carl D. Worth

   Copyright (C) 2001 University of Southern California

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#include "includes.h"
#include "opkg_message.h"

#include <glob.h>

#include "opkg_remove.h"
#include "opkg_error.h"
#include "opkg_cmd.h"

#include "file_util.h"
#include "sprintf_alloc.h"
#include "str_util.h"
#include "libbb/libbb.h"

/*
 * Returns number of the number of packages depending on the packages provided by this package.
 * Every package implicitly provides itself.
 */
int pkg_has_installed_dependents(opkg_conf_t *conf, abstract_pkg_t *parent_apkg, pkg_t *pkg, abstract_pkg_t *** pdependents)
{
     int nprovides = pkg->provides_count;
     abstract_pkg_t **provides = pkg->provides;
     int n_installed_dependents = 0;
     int i;
     for (i = 0; i < nprovides; i++) {
	  abstract_pkg_t *providee = provides[i];
	  abstract_pkg_t **dependers = providee->depended_upon_by;
	  abstract_pkg_t *dep_ab_pkg;
	  if (dependers == NULL)
	       continue;
	  while ((dep_ab_pkg = *dependers++) != NULL) {
	       if (dep_ab_pkg->state_status == SS_INSTALLED){
		    n_installed_dependents++;
               }
	  }

     }
     /* if caller requested the set of installed dependents */
     if (pdependents) {
	  int p = 0;
	  abstract_pkg_t **dependents = xcalloc((n_installed_dependents+1), sizeof(abstract_pkg_t *));

	  *pdependents = dependents;
	  for (i = 0; i < nprovides; i++) {
	       abstract_pkg_t *providee = provides[i];
	       abstract_pkg_t **dependers = providee->depended_upon_by;
	       abstract_pkg_t *dep_ab_pkg;
	       if (dependers == NULL)
		    continue;
	       while ((dep_ab_pkg = *dependers++) != NULL) {
		    if (dep_ab_pkg->state_status == SS_INSTALLED && !(dep_ab_pkg->state_flag & SF_MARKED)) {
			 dependents[p++] = dep_ab_pkg;
			 dep_ab_pkg->state_flag |= SF_MARKED;
		    }
	       }
	  }
	  dependents[p] = NULL;
	  /* now clear the marks */
	  for (i = 0; i < p; i++) {
	       abstract_pkg_t *dep_ab_pkg = dependents[i];
	       dep_ab_pkg->state_flag &= ~SF_MARKED;
	  }
     }
     return n_installed_dependents;
}

int opkg_remove_dependent_pkgs (opkg_conf_t *conf, pkg_t *pkg, abstract_pkg_t **dependents)
{
    int i;
    int a;
    int count;
    pkg_vec_t *dependent_pkgs;
    abstract_pkg_t * ab_pkg;

    if((ab_pkg = pkg->parent) == NULL){
	fprintf(stderr, "%s: unable to get dependent pkgs. pkg %s isn't in hash table\n",
		__FUNCTION__, pkg->name);
	return 0;
    }
    
    if (dependents == NULL)
	    return 0;

    // here i am using the dependencies_checked
    if (ab_pkg->dependencies_checked == 2) // variable to make out whether this package
	return 0;			   // has already been encountered in the process
	                                   // of marking packages for removal - Karthik
    ab_pkg->dependencies_checked = 2;

    i = 0;
    count = 1;
    dependent_pkgs = pkg_vec_alloc();

    while (dependents [i] != NULL) {
        abstract_pkg_t *dep_ab_pkg = dependents[i];
	
	if (dep_ab_pkg->dependencies_checked == 2){
	    i++;
	    continue;	
        }
        if (dep_ab_pkg->state_status == SS_INSTALLED) {
            for (a = 0; a < dep_ab_pkg->pkgs->len; a++) {
                pkg_t *dep_pkg = dep_ab_pkg->pkgs->pkgs[a];
                if (dep_pkg->state_status == SS_INSTALLED) {
                    pkg_vec_insert(dependent_pkgs, dep_pkg);
                    count++;
                }
            }
        }
	i++;
	/* 1 - to keep track of visited ab_pkgs when checking for possiblility of a broken removal of pkgs.
	 * 2 - to keep track of pkgs whose deps have been checked alrdy  - Karthik */	
    }
    
    if (count == 1) {
        free(dependent_pkgs);  
	return 0;
    }
    
    
    int err=0;
    for (i = 0; i < dependent_pkgs->len; i++) {
        err = opkg_remove_pkg(conf, dependent_pkgs->pkgs[i],0);
        if (err)
            break;
    }
    free(dependent_pkgs);
    return err;
}

static int user_prefers_removing_dependents(opkg_conf_t *conf, abstract_pkg_t *abpkg, pkg_t *pkg, abstract_pkg_t **dependents)
{
    abstract_pkg_t *dep_ab_pkg;
    opkg_message(conf, OPKG_ERROR, "Package %s is depended upon by packages:\n", pkg->name);
    while ((dep_ab_pkg = *dependents++) != NULL) {
	 if (dep_ab_pkg->state_status == SS_INSTALLED)
	      opkg_message(conf, OPKG_ERROR, "\t%s\n", dep_ab_pkg->name);
    }
    opkg_message(conf, OPKG_ERROR, "These might cease to work if package %s is removed.\n\n", pkg->name);
    opkg_message(conf, OPKG_ERROR, "");
    opkg_message(conf, OPKG_ERROR, "You can force removal of this package with -force-depends.\n");
    opkg_message(conf, OPKG_ERROR, "You can force removal of this package and its dependents\n");
    opkg_message(conf, OPKG_ERROR, "with -force-removal-of-dependent-packages or -recursive\n");
    opkg_message(conf, OPKG_ERROR, "or by setting option force_removal_of_dependent_packages\n");
    opkg_message(conf, OPKG_ERROR, "in opkg.conf.\n");
    return 0;
}

static int remove_autoinstalled (opkg_conf_t *conf, pkg_t *pkg)
{
  /*
   * find and remove packages that were autoinstalled and are orphaned by the removal of pkg
   */

  char *buffer, *d_str;
  int i;

  for (i = 0; i < pkg->depends_count; ++i)
  {
    int x = 0;
    pkg_t *p;
    d_str = pkg->depends_str[i];
    buffer = xcalloc(1, strlen (d_str) + 1);

    while (d_str[x] != '\0' && d_str[x] != ' ')
    {
      buffer[x] = d_str[x];
      ++x;
    }
    buffer[x] = '\0';
    buffer = xrealloc (buffer, strlen (buffer) + 1);
    p = pkg_hash_fetch_installed_by_name (&conf->pkg_hash, buffer);

    /* if the package is not installed, this could have been a circular
     * depenancy and the package has already been removed */
    if (!p)
      return -1;

    if (p->auto_installed)
    {
      int deps;
      abstract_pkg_t **dependents;

      deps = pkg_has_installed_dependents(conf, NULL, p, &dependents);
      if (deps == 0)
      {
	 opkg_message (conf, OPKG_INFO,
	               "%s was autoinstalled but is now orphaned\n", buffer);
         opkg_remove_pkg(conf, p,0);
      }
	else
	   opkg_message (conf, OPKG_INFO, "%s was autoinstalled and is still required by "
	                 "%d installed packages\n", buffer, deps);
    }
    free (buffer);
  }

  return 0;
}

int opkg_remove_pkg(opkg_conf_t *conf, pkg_t *pkg,int message)
{
/* Actually, when "message == 1" I have been called from an upgrade, and not from a normal remove
   thus I wan't check for essential, as I'm upgrading.
   I hope it won't break anything :) 
*/
     int err;
     abstract_pkg_t *parent_pkg = NULL;

     if (pkg->essential && !message) {
	  if (conf->force_removal_of_essential_packages) {
	       fprintf(stderr, "WARNING: Removing essential package %s under your coercion.\n"
		       "\tIf your system breaks, you get to keep both pieces\n",
		       pkg->name);
	  } else {
	       fprintf(stderr, "ERROR: Refusing to remove essential package %s.\n"
		       "\tRemoving an essential package may lead to an unusable system, but if\n"
		       "\tyou enjoy that kind of pain, you can force opkg to proceed against\n"
		       "\tits will with the option: -force-removal-of-essential-packages\n",
		       pkg->name);
	       return OPKG_PKG_IS_ESSENTIAL;
	  }
     }

     if ((parent_pkg = pkg->parent) == NULL)
	  return 0;

     /* only attempt to remove dependent installed packages if
      * force_depends is not specified or the package is being
      * replaced.
      */
     if (!conf->force_depends
	 && !(pkg->state_flag & SF_REPLACE)) {
	  abstract_pkg_t **dependents;
	  int has_installed_dependents = 
	       pkg_has_installed_dependents(conf, parent_pkg, pkg, &dependents);

	  if (has_installed_dependents) {
	       /*
		* if this package is depended up by others, then either we should
		* not remove it or we should remove it and all of its dependents 
		*/

	       if (!conf->force_removal_of_dependent_packages
		   && !user_prefers_removing_dependents(conf, parent_pkg, pkg, dependents)) {
		    free(dependents);
		    return OPKG_PKG_HAS_DEPENDENTS;
	       }

	       /* remove packages depending on this package - Karthik */
	       err = opkg_remove_dependent_pkgs (conf, pkg, dependents);
	       if (err) {
	         free(dependents);
                 return err;
               }
	  }
          if (dependents)
              free(dependents);
     }

     if ( message==0 ){
         opkg_message (conf, OPKG_NOTICE,
	               "Removing package %s from %s...\n", pkg->name, pkg->dest->name);
         fflush(stdout);
     }
     pkg->state_flag |= SF_FILELIST_CHANGED;

     pkg->state_want = SW_DEINSTALL;
     opkg_state_changed++;

     pkg_run_script(conf, pkg, "prerm", "remove");

     /* DPKG_INCOMPATIBILITY: dpkg is slightly different here. It
	maintains an empty filelist rather than deleting it. That seems
	like a big pain, and I don't see that that should make a big
	difference, but for anyone who wants tighter compatibility,
	feel free to fix this. */
     remove_data_files_and_list(conf, pkg);

     pkg_run_script(conf, pkg, "postrm", "remove");

     remove_maintainer_scripts_except_postrm(conf, pkg);

     /* Aman Gupta - Since opkg is made for handheld devices with limited
      * space, it doesn't make sense to leave extra configurations, files, 
      * and maintainer scripts left around. So, we make remove like purge, 
      * and take out all the crap :) */

     remove_postrm(conf, pkg);
     pkg->state_status = SS_NOT_INSTALLED;

     if (parent_pkg) 
	  parent_pkg->state_status = SS_NOT_INSTALLED;


     /* remove autoinstalled packages that are orphaned by the removal of this one */
     if (conf->autoremove)
       remove_autoinstalled (conf, pkg);



     return 0;
}

int opkg_purge_pkg(opkg_conf_t *conf, pkg_t *pkg)
{
    opkg_remove_pkg(conf, pkg,0);
    return 0;
}

int remove_data_files_and_list(opkg_conf_t *conf, pkg_t *pkg)
{
     str_list_t installed_dirs;
     str_list_t *installed_files;
     str_list_elt_t *iter;
     char *file_name;
     conffile_t *conffile;
     int removed_a_dir;
     pkg_t *owner;
     int rootdirlen = 0;

     str_list_init(&installed_dirs);
     installed_files = pkg_get_installed_files(conf, pkg);

     /* don't include trailing slash */
     if (conf->offline_root)
          rootdirlen = strlen(conf->offline_root);

     for (iter = str_list_first(installed_files); iter; iter = str_list_next(installed_files, iter)) {
	  file_name = (char *)iter->data;

	  if (file_is_dir(file_name)) {
	       str_list_append(&installed_dirs, file_name);
	       continue;
	  }

	  conffile = pkg_get_conffile(pkg, file_name+rootdirlen);
	  if (conffile) {
	       /* XXX: QUESTION: Is this right? I figure we only need to
		  save the conffile if it has been modified. Is that what
		  dpkg does? Or does dpkg preserve all conffiles? If so,
		  this seems like a better thing to do to conserve
		  space. */
	       if (conffile_has_been_modified(conf, conffile)) {
		    opkg_message (conf, OPKG_NOTICE,
		                  "  not deleting modified conffile %s\n", file_name);
		    fflush(stdout);
		    continue;
	       }
	  }

	  opkg_message(conf, OPKG_INFO, "  deleting %s (noaction=%d)\n", file_name, conf->noaction);
	  if (!conf->noaction)
	       unlink(file_name);
     }

     if (!conf->noaction) {
	  do {
	       removed_a_dir = 0;
	       for (iter = str_list_first(&installed_dirs); iter; iter = str_list_next(&installed_dirs, iter)) {
		    file_name = (char *)iter->data;
	    
		    if (rmdir(file_name) == 0) {
			 opkg_message(conf, OPKG_INFO, "  deleting %s\n", file_name);
			 removed_a_dir = 1;
			 str_list_remove(&installed_dirs, &iter);
		    }
	       }
	  } while (removed_a_dir);
     }

     pkg_free_installed_files(pkg);
     /* We have to remove the file list now, so that
	find_pkg_owning_file does not always just report this package */
     pkg_remove_installed_files_list(conf, pkg);

     /* Don't print warning for dirs that are provided by other packages */
     for (iter = str_list_first(&installed_dirs); iter; iter = str_list_next(&installed_dirs, iter)) {
	  file_name = (char *)iter->data;

	  owner = file_hash_get_file_owner(conf, file_name);
	  if (owner) {
	       free(iter->data);
	       iter->data = NULL;
	       str_list_remove(&installed_dirs, &iter);
	  }
     }

     /* cleanup */
     while (!void_list_empty(&installed_dirs)) {
        iter = str_list_pop(&installed_dirs);
        free(iter->data);
        free(iter);
     }
     str_list_deinit(&installed_dirs);

     return 0;
}

int remove_maintainer_scripts_except_postrm(opkg_conf_t *conf, pkg_t *pkg)
{
    int i, err;
    char *globpattern;
    glob_t globbuf;
    
    if (conf->noaction) return 0;

    sprintf_alloc(&globpattern, "%s/%s.*",
		  pkg->dest->info_dir, pkg->name);
    err = glob(globpattern, 0, NULL, &globbuf);
    free(globpattern);
    if (err) {
	return 0;
    }

    for (i = 0; i < globbuf.gl_pathc; i++) {
	if (str_ends_with(globbuf.gl_pathv[i], ".postrm")) {
	    continue;
	}
        opkg_message(conf, OPKG_INFO, "  deleting %s\n", globbuf.gl_pathv[i]);
	unlink(globbuf.gl_pathv[i]);
    }
    globfree(&globbuf);

    return 0;
}

int remove_postrm(opkg_conf_t *conf, pkg_t *pkg)
{
    char *postrm_file_name;

    if (conf->noaction) return 0;

    sprintf_alloc(&postrm_file_name, "%s/%s.postrm",
		  pkg->dest->info_dir, pkg->name);
    unlink(postrm_file_name);
    free(postrm_file_name);

    return 0;
}