692592268ce3feaac8362ce4cf944b9ddc0e7e39
[people/mcb30/busybox.git] / archival / dpkg.c
1 /*
2  *  Mini dpkg implementation for busybox.
3  *  This is not meant as a replacemnt for dpkg
4  *
5  *  Written By Glenn McGrath with the help of others
6  *  Copyright (C) 2001 by Glenn McGrath
7  *              
8  *  Started life as a busybox implementation of udpkg
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; either version 2 of the License, or
13  *  (at your option) any later version.
14  *
15  *  This program is distributed in the hope that it will be useful,
16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *  GNU Library General Public License for more details.
19  *
20  *  You should have received a copy of the GNU General Public License
21  *  along with this program; if not, write to the Free Software
22  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23  */
24
25 /*
26  * Known difference between busybox dpkg and the official dpkg that i dont
27  * consider important, its worth keeping a note of differences anyway, just to
28  * make it easier to maintain.
29  *  - The first value for the Confflile: field isnt placed on a new line.
30  *  - The <package>.control file is extracted and kept in the info dir.
31  *  - When installing a package the Status: field is placed at the end of the
32  *      section, rather than just after the Package: field.
33  *  - Packages with previously unknown status are inserted at the begining of
34  *      the status file
35  *
36  * Bugs that need to be fixed
37  *  - (unknown, please let me know when you find any)
38  *
39  */
40
41 #include <fcntl.h>
42 #include <getopt.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include "unarchive.h"
47 #include "busybox.h"
48
49 /* NOTE: If you vary HASH_PRIME sizes be aware,
50  * 1) Tweaking these will have a big effect on how much memory this program uses.
51  * 2) For computational efficiency these hash tables should be at least 20%
52  *    larger than the maximum number of elements stored in it.
53  * 3) All _HASH_PRIME's must be a prime number or chaos is assured, if your looking
54  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
55  * 4) If you go bigger than 15 bits you may get into trouble (untested) as its
56  *    sometimes cast to an unsigned int, if you go to 16 bit you will overlap
57  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
58  */
59
60 /* NAME_HASH_PRIME, Stores package names and versions, 
61  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
62  * as there a lot of duplicate version numbers */
63 #define NAME_HASH_PRIME 16381
64 char *name_hashtable[NAME_HASH_PRIME + 1];
65
66 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
67  * It must not be smaller than STATUS_HASH_PRIME,
68  * Currently only packages from status_hashtable are stored in here, but in
69  * future this may be used to store packages not only from a status file,
70  * but an available_hashtable, and even multiple packages files.
71  * Package can be stored more than once if they have different versions.
72  * e.g. The same package may have different versions in the status file
73  *      and available file */
74 #define PACKAGE_HASH_PRIME 10007
75 typedef struct edge_s {
76         unsigned int operator:3;
77         unsigned int type:4;
78         unsigned int name:14;
79         unsigned int version:14;
80 } edge_t;
81
82 typedef struct common_node_s {
83         unsigned int name:14;
84         unsigned int version:14;
85         unsigned int num_of_edges:14;
86         edge_t **edge;
87 } common_node_t;
88 common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
89
90 /* Currently it doesnt store packages that have state-status of not-installed
91  * So it only really has to be the size of the maximum number of packages
92  * likely to be installed at any one time, so there is a bit of leaway here */
93 #define STATUS_HASH_PRIME 8191
94 typedef struct status_node_s {
95         unsigned int package:14;        /* has to fit PACKAGE_HASH_PRIME */
96         unsigned int status:14;         /* has to fit STATUS_HASH_PRIME */
97 } status_node_t;
98 status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
99
100 /* Even numbers are for 'extras', like ored dependecies or null */
101 enum edge_type_e {
102         EDGE_NULL = 0,
103         EDGE_PRE_DEPENDS = 1,
104         EDGE_OR_PRE_DEPENDS = 2,
105         EDGE_DEPENDS = 3,
106         EDGE_OR_DEPENDS = 4,
107         EDGE_REPLACES = 5,
108         EDGE_PROVIDES = 7,
109         EDGE_CONFLICTS = 9,
110         EDGE_SUGGESTS = 11,
111         EDGE_RECOMMENDS = 13,
112         EDGE_ENHANCES = 15
113 };
114 enum operator_e {
115         VER_NULL = 0,
116         VER_EQUAL = 1,
117         VER_LESS = 2,
118         VER_LESS_EQUAL = 3,
119         VER_MORE = 4,
120         VER_MORE_EQUAL = 5,
121         VER_ANY = 6
122 };
123
124 enum dpkg_opt_e {
125         dpkg_opt_purge = 1,
126         dpkg_opt_remove = 2,
127         dpkg_opt_unpack = 4,
128         dpkg_opt_configure = 8,
129         dpkg_opt_install = 16,
130         dpkg_opt_package_name = 32,
131         dpkg_opt_filename = 64,
132         dpkg_opt_list_installed = 128,
133         dpkg_opt_force_ignore_depends = 256
134 };
135
136 typedef struct deb_file_s {
137         char *control_file;
138         char *filename;
139         unsigned int package:14;
140 } deb_file_t;
141
142
143 void make_hash(const char *key, unsigned int *start, unsigned int *decrement, const int hash_prime)
144 {
145         unsigned long int hash_num = key[0];
146         int len = strlen(key);
147         int i;
148
149         /* Maybe i should have uses a "proper" hashing algorithm here instead
150          * of making one up myself, seems to be working ok though. */
151         for(i = 1; i < len; i++) {
152                 /* shifts the ascii based value and adds it to previous value
153                  * shift amount is mod 24 because long int is 32 bit and data
154                  * to be shifted is 8, dont want to shift data to where it has
155                  * no effect*/
156                 hash_num += ((key[i] + key[i-1]) << ((key[i] * i) % 24)); 
157         }
158         *start = (unsigned int) hash_num % hash_prime;
159         *decrement = (unsigned int) 1 + (hash_num % (hash_prime - 1));
160 }
161
162 /* this adds the key to the hash table */
163 int search_name_hashtable(const char *key)
164 {
165         unsigned int probe_address = 0;
166         unsigned int probe_decrement = 0;
167 //      char *temp;
168
169         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
170         while(name_hashtable[probe_address] != NULL) {
171                 if (strcmp(name_hashtable[probe_address], key) == 0) {
172                         return(probe_address);
173                 } else {
174                         probe_address -= probe_decrement;
175                         if ((int)probe_address < 0) {
176                                 probe_address += NAME_HASH_PRIME;
177                         }
178                 }
179         }
180         name_hashtable[probe_address] = xstrdup(key);
181         return(probe_address);
182 }
183
184 /* this DOESNT add the key to the hashtable
185  * TODO make it consistent with search_name_hashtable
186  */
187 unsigned int search_status_hashtable(const char *key)
188 {
189         unsigned int probe_address = 0;
190         unsigned int probe_decrement = 0;
191
192         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
193         while(status_hashtable[probe_address] != NULL) {
194                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
195                         break;
196                 } else {
197                         probe_address -= probe_decrement;
198                         if ((int)probe_address < 0) {
199                                 probe_address += STATUS_HASH_PRIME;
200                         }
201                 }
202         }
203         return(probe_address);
204 }
205
206 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
207 int version_compare_part(const char *version1, const char *version2)
208 {
209         int upstream_len1 = 0;
210         int upstream_len2 = 0;
211         char *name1_char;
212         char *name2_char;
213         int len1 = 0;
214         int len2 = 0;
215         int tmp_int;
216         int ver_num1;
217         int ver_num2;
218         int ret;
219
220         if (version1 == NULL) {
221                 version1 = xstrdup("");
222         }
223         if (version2 == NULL) {
224                 version2 = xstrdup("");
225         }
226         upstream_len1 = strlen(version1);
227         upstream_len2 = strlen(version2);
228
229         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
230                 /* Compare non-digit section */
231                 tmp_int = strcspn(&version1[len1], "0123456789");
232                 name1_char = xstrndup(&version1[len1], tmp_int);
233                 len1 += tmp_int;
234                 tmp_int = strcspn(&version2[len2], "0123456789");
235                 name2_char = xstrndup(&version2[len2], tmp_int);
236                 len2 += tmp_int;
237                 tmp_int = strcmp(name1_char, name2_char);
238                 free(name1_char);
239                 free(name2_char);
240                 if (tmp_int != 0) {
241                         ret = tmp_int;
242                         goto cleanup_version_compare_part;
243                 }
244
245                 /* Compare digits */
246                 tmp_int = strspn(&version1[len1], "0123456789");
247                 name1_char = xstrndup(&version1[len1], tmp_int);
248                 len1 += tmp_int;
249                 tmp_int = strspn(&version2[len2], "0123456789");
250                 name2_char = xstrndup(&version2[len2], tmp_int);
251                 len2 += tmp_int;
252                 ver_num1 = atoi(name1_char);
253                 ver_num2 = atoi(name2_char);
254                 free(name1_char);
255                 free(name2_char);
256                 if (ver_num1 < ver_num2) {
257                         ret = -1;
258                         goto cleanup_version_compare_part;
259                 }
260                 else if (ver_num1 > ver_num2) {
261                         ret = 1;
262                         goto cleanup_version_compare_part;
263                 }
264         }
265         ret = 0;
266 cleanup_version_compare_part:
267         return(ret);
268 }
269
270 /* if ver1 < ver2 return -1,
271  * if ver1 = ver2 return 0,
272  * if ver1 > ver2 return 1,
273  */
274 int version_compare(const unsigned int ver1, const unsigned int ver2)
275 {
276         char *ch_ver1 = name_hashtable[ver1];
277         char *ch_ver2 = name_hashtable[ver2];
278
279         char epoch1, epoch2;
280         char *deb_ver1, *deb_ver2;
281         char *ver1_ptr, *ver2_ptr;
282         char *upstream_ver1;
283         char *upstream_ver2;
284         int result;
285
286         /* Compare epoch */
287         if (ch_ver1[1] == ':') {
288                 epoch1 = ch_ver1[0];
289                 ver1_ptr = strchr(ch_ver1, ':') + 1;
290         } else {
291                 epoch1 = '0';
292                 ver1_ptr = ch_ver1;
293         }
294         if (ch_ver2[1] == ':') {
295                 epoch2 = ch_ver2[0];
296                 ver2_ptr = strchr(ch_ver2, ':') + 1;
297         } else {
298                 epoch2 = '0';
299                 ver2_ptr = ch_ver2;
300         }
301         if (epoch1 < epoch2) {
302                 return(-1);
303         }
304         else if (epoch1 > epoch2) {
305                 return(1);
306         }
307
308         /* Compare upstream version */
309         upstream_ver1 = xstrdup(ver1_ptr);
310         upstream_ver2 = xstrdup(ver2_ptr);
311
312         /* Chop off debian version, and store for later use */
313         deb_ver1 = strrchr(upstream_ver1, '-');
314         deb_ver2 = strrchr(upstream_ver2, '-');
315         if (deb_ver1) {
316                 deb_ver1[0] = '\0';
317                 deb_ver1++;
318         }
319         if (deb_ver2) {
320                 deb_ver2[0] = '\0';
321                 deb_ver2++;
322         }
323         result = version_compare_part(upstream_ver1, upstream_ver2);
324
325         free(upstream_ver1);
326         free(upstream_ver2);
327
328         if (result != 0) {
329                 return(result);
330         }
331
332         /* Compare debian versions */
333         return(version_compare_part(deb_ver1, deb_ver2));
334 }
335
336 int test_version(const unsigned int version1, const unsigned int version2, const unsigned int 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                         if (version_result == 0) {
344                                 return(TRUE);
345                         }
346                         break;
347                 case (VER_LESS):
348                         if (version_result < 0) {
349                                 return(TRUE);
350                         }
351                         break;
352                 case (VER_LESS_EQUAL):
353                         if (version_result <= 0) {
354                                 return(TRUE);
355                         }
356                         break;
357                 case (VER_MORE):
358                         if (version_result > 0) {
359                                 return(TRUE);
360                         }
361                         break;
362                 case (VER_MORE_EQUAL):
363                         if (version_result >= 0) {
364                                 return(TRUE);
365                         }
366                         break;
367         }
368         return(FALSE);
369 }
370
371
372 int search_package_hashtable(const unsigned int name, const unsigned int version, const unsigned int operator)
373 {
374         unsigned int probe_address = 0;
375         unsigned int probe_decrement = 0;
376
377         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
378         while(package_hashtable[probe_address] != NULL) {
379                 if (package_hashtable[probe_address]->name == name) {
380                         if (operator == VER_ANY) {
381                                 return(probe_address);
382                         }
383                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
384                                 return(probe_address);
385                         }
386                 }
387                 probe_address -= probe_decrement;
388                 if ((int)probe_address < 0) {
389                         probe_address += PACKAGE_HASH_PRIME;
390                 }
391         }
392         return(probe_address);
393 }
394
395 /*
396  * Create one new node and one new edge for every dependency.
397  */
398 void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned int edge_type)
399 {
400         char *line = xstrdup(whole_line);
401         char *line2;
402         char *line_ptr1 = NULL;
403         char *line_ptr2 = NULL;
404         char *field;
405         char *field2;
406         char *version;
407         edge_t *edge;
408         int offset_ch;
409         int type;
410
411         field = strtok_r(line, ",", &line_ptr1);
412         do {
413                 line2 = xstrdup(field);
414                 field2 = strtok_r(line2, "|", &line_ptr2);
415                 if ((edge_type == EDGE_DEPENDS) && (strcmp(field, field2) != 0)) {
416                         type = EDGE_OR_DEPENDS;
417                 }
418                 else if ((edge_type == EDGE_PRE_DEPENDS) && (strcmp(field, field2) != 0)) {
419                         type = EDGE_OR_PRE_DEPENDS;
420                 } else {
421                         type = edge_type;
422                 }
423
424                 do {
425                         edge = (edge_t *) xmalloc(sizeof(edge_t));
426                         edge->type = type;
427
428                         /* Skip any extra leading spaces */
429                         field2 += strspn(field2, " ");
430
431                         /* Get dependency version info */
432                         version = strchr(field2, '(');
433                         if (version == NULL) {
434                                 edge->operator = VER_ANY;
435                                 /* Get the versions hash number, adding it if the number isnt already in there */
436                                 edge->version = search_name_hashtable("ANY");
437                         } else {
438                                 /* Skip leading ' ' or '(' */
439                                 version += strspn(field2, " ");
440                                 version += strspn(version, "(");
441                                 /* Calculate length of any operator charactors */
442                                 offset_ch = strspn(version, "<=>");
443                                 /* Determine operator */
444                                 if (offset_ch > 0) {
445                                         if (strncmp(version, "=", offset_ch) == 0) {
446                                                 edge->operator = VER_EQUAL;
447                                         }
448                                         else if (strncmp(version, "<<", offset_ch) == 0) {
449                                                 edge->operator = VER_LESS;
450                                         }
451                                         else if (strncmp(version, "<=", offset_ch) == 0) {
452                                                 edge->operator = VER_LESS_EQUAL;
453                                         }
454                                         else if (strncmp(version, ">>", offset_ch) == 0) {
455                                                 edge->operator = VER_MORE;
456                                         }
457                                         else if (strncmp(version, ">=", offset_ch) == 0) {
458                                                 edge->operator = VER_MORE_EQUAL;
459                                         } else {
460                                                 error_msg_and_die("Illegal operator\n");
461                                         }
462                                 }
463                                 /* skip to start of version numbers */
464                                 version += offset_ch;
465                                 version += strspn(version, " ");
466
467                                 /* Truncate version at trailing ' ' or ')' */
468                                 version[strcspn(version, " )")] = '\0';
469                                 /* Get the versions hash number, adding it if the number isnt already in there */
470                                 edge->version = search_name_hashtable(version);
471                         }
472
473                         /* Get the dependency name */
474                         field2[strcspn(field2, " (")] = '\0';
475                         edge->name = search_name_hashtable(field2);
476         
477                         /* link the new edge to the current node */
478                         parent_node->num_of_edges++;
479                         parent_node->edge = xrealloc(parent_node->edge, sizeof(edge_t) * (parent_node->num_of_edges + 1));
480                         parent_node->edge[parent_node->num_of_edges - 1] = edge;
481                 } while ((field2 = strtok_r(NULL, "|", &line_ptr2)) != NULL);
482                 free(line2);
483         } while ((field = strtok_r(NULL, ",", &line_ptr1)) != NULL);
484         free(line);
485
486         return;
487 }
488
489 void free_package(common_node_t *node)
490 {
491         unsigned short i;
492         if (node) {
493                 for (i = 0; i < node->num_of_edges; i++) {
494                         free(node->edge[i]);
495                 }
496                 free(node->edge);
497                 free(node);
498         }
499 }
500
501 unsigned int fill_package_struct(char *control_buffer)
502 {
503         common_node_t *new_node = (common_node_t *) xcalloc(1, sizeof(common_node_t));
504         const char *field_names[] = { "Package", "Version", "Pre-Depends", "Depends",
505                 "Replaces", "Provides", "Conflicts", "Suggests", "Recommends", "Enhances", 0};
506         char *field_name;
507         char *field_value;
508         int field_start = 0;
509         int num = -1;
510         int buffer_length = strlen(control_buffer);
511
512         new_node->version = search_name_hashtable("unknown");
513         while (field_start < buffer_length) {
514                 unsigned short field_num;
515
516                 field_start += read_package_field(&control_buffer[field_start],
517                                 &field_name, &field_value);
518
519                 if (field_name == NULL) {
520                         goto fill_package_struct_cleanup; /* Oh no, the dreaded goto statement ! */
521                 }
522
523                 field_num = compare_string_array(field_names, field_name);              
524                 switch(field_num) {
525                         case 0: /* Package */
526                                 new_node->name = search_name_hashtable(field_value);
527                                 break;
528                         case 1: /* Version */
529                                 new_node->version = search_name_hashtable(field_value);
530                                 break;
531                         case 2: /* Pre-Depends */
532                                 add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
533                                 break;
534                         case 3: /* Depends */
535                                 add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
536                                 break;
537                         case 4: /* Replaces */
538                                 add_split_dependencies(new_node, field_value, EDGE_REPLACES);
539                                 break;
540                         case 5: /* Provides */
541                                 add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
542                                 break;
543                         case 6: /* Conflicts */
544                                 add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
545                                 break;
546                         case 7: /* Suggests */
547                                 add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
548                                 break;
549                         case 8: /* Recommends */
550                                 add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
551                                 break;
552                         case 9: /* Enhances */
553                                 add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
554                                 break;
555                 }
556 fill_package_struct_cleanup:
557                 free(field_name);
558                 free(field_value);
559         }
560
561         if (new_node->version == search_name_hashtable("unknown")) {
562                 free_package(new_node);
563                 return(-1);
564         }
565         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
566         if (package_hashtable[num] == NULL) {
567                 package_hashtable[num] = new_node;
568         } else {
569                 free_package(new_node);
570         }
571         return(num);
572 }
573
574 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
575 unsigned int get_status(const unsigned int status_node, const int num)
576 {
577         char *status_string = name_hashtable[status_hashtable[status_node]->status];
578         char *state_sub_string;
579         unsigned int state_sub_num;
580         int len;
581         int i;
582
583         /* set tmp_string to point to the start of the word number */
584         for (i = 1; i < num; i++) {
585                 /* skip past a word */
586                 status_string += strcspn(status_string, " ");
587                 /* skip past the seperating spaces */
588                 status_string += strspn(status_string, " ");
589         }
590         len = strcspn(status_string, " \n\0");
591         state_sub_string = xstrndup(status_string, len);
592         state_sub_num = search_name_hashtable(state_sub_string);
593         free(state_sub_string);
594         return(state_sub_num);
595 }
596
597 void set_status(const unsigned int status_node_num, const char *new_value, const int position)
598 {
599         const unsigned int new_value_len = strlen(new_value);
600         const unsigned int new_value_num = search_name_hashtable(new_value);
601         unsigned int want = get_status(status_node_num, 1);
602         unsigned int flag = get_status(status_node_num, 2);
603         unsigned int status = get_status(status_node_num, 3);
604         int want_len = strlen(name_hashtable[want]);
605         int flag_len = strlen(name_hashtable[flag]);
606         int status_len = strlen(name_hashtable[status]);
607         char *new_status;
608
609         switch (position) {
610                 case (1):
611                         want = new_value_num;
612                         want_len = new_value_len;
613                         break;
614                 case (2):
615                         flag = new_value_num;
616                         flag_len = new_value_len;
617                         break;
618                 case (3):
619                         status = new_value_num;
620                         status_len = new_value_len;
621                         break;
622                 default:
623                         error_msg_and_die("DEBUG ONLY: this shouldnt happen");
624         }
625
626         new_status = (char *) xmalloc(want_len + flag_len + status_len + 3);
627         sprintf(new_status, "%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
628         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
629         free(new_status);
630         return;
631 }
632
633 void index_status_file(const char *filename)
634 {
635         FILE *status_file;
636         char *control_buffer;
637         char *status_line;
638         status_node_t *status_node = NULL;
639         unsigned int status_num;
640
641         status_file = xfopen(filename, "r");
642         while ((control_buffer = fgets_str(status_file, "\n\n")) != NULL) {
643                 const unsigned int package_num = fill_package_struct(control_buffer);
644                 if (package_num != -1) {
645                         status_node = xmalloc(sizeof(status_node_t));
646                         /* fill_package_struct doesnt handle the status field */
647                         status_line = strstr(control_buffer, "Status:");
648                         if (status_line != NULL) {
649                                 status_line += 7;
650                                 status_line += strspn(status_line, " \n\t");
651                                 status_line = xstrndup(status_line, strcspn(status_line, "\n\0"));
652                                 status_node->status = search_name_hashtable(status_line);
653                                 free(status_line);
654                         }
655                         status_node->package = package_num;
656                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
657                         status_hashtable[status_num] = status_node;
658                 }
659                 free(control_buffer);
660         }
661         fclose(status_file);
662         return;
663 }
664
665
666 char *get_depends_field(common_node_t *package, const int depends_type)
667 {
668         char *depends = NULL;
669         char *old_sep = (char *)xcalloc(1, 3);
670         char *new_sep = (char *)xcalloc(1, 3);
671         int line_size = 0;
672         int depends_size;
673
674         int i;
675
676         for (i = 0; i < package->num_of_edges; i++) {
677                 if ((package->edge[i]->type == EDGE_OR_PRE_DEPENDS) ||
678                         (package->edge[i]->type == EDGE_OR_DEPENDS)) {
679                 }
680
681                 if ((package->edge[i]->type == depends_type) ||
682                         (package->edge[i]->type == depends_type + 1)) {
683                         /* Check if its the first time through */
684
685                         depends_size = 8 + strlen(name_hashtable[package->edge[i]->name])
686                                 + strlen(name_hashtable[package->edge[i]->version]);
687                         line_size += depends_size;
688                         depends = (char *) xrealloc(depends, line_size + 1);
689
690                         /* Check to see if this dependency is the type we are looking for
691                          * +1 to check for 'extra' types, e.g. ored dependecies */
692                         strcpy(old_sep, new_sep);
693                         if (package->edge[i]->type == depends_type) {
694                                 strcpy(new_sep, ", ");
695                         }
696                         else if (package->edge[i]->type == depends_type + 1) {
697                                 strcpy(new_sep, "| ");
698                         }
699
700                         if (depends_size == line_size) {
701                                 strcpy(depends, "");
702                         } else {
703                                 if ((strcmp(old_sep, "| ") == 0) && (strcmp(new_sep, "| ") == 0)) {
704                                         strcat(depends, " | ");
705                                 } else {
706                                         strcat(depends, ", ");
707                                 }
708                         }
709
710                         strcat(depends, name_hashtable[package->edge[i]->name]);
711                         if (strcmp(name_hashtable[package->edge[i]->version], "NULL") != 0) {
712                                 if (package->edge[i]->operator == VER_EQUAL) {
713                                         strcat(depends, " (= ");
714                                 }
715                                 else if (package->edge[i]->operator == VER_LESS) {
716                                         strcat(depends, " (<< ");
717                                 }
718                                 else if (package->edge[i]->operator == VER_LESS_EQUAL) {
719                                         strcat(depends, " (<= ");
720                                 }
721                                 else if (package->edge[i]->operator == VER_MORE) {
722                                         strcat(depends, " (>> ");
723                                 }
724                                 else if (package->edge[i]->operator == VER_MORE_EQUAL) {
725                                         strcat(depends, " (>= ");
726                                 } else {
727                                         strcat(depends, " (");
728                                 }
729                                 strcat(depends, name_hashtable[package->edge[i]->version]);
730                                 strcat(depends, ")");
731                         }
732                 }
733         }
734         return(depends);
735 }
736
737 void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
738 {
739         char *name;
740         char *value;
741         int start = 0;
742         while (1) {
743                 start += read_package_field(&control_buffer[start], &name, &value);
744                 if (name == NULL) {
745                         break;
746                 }
747                 if (strcmp(name, "Status") != 0) {
748                         fprintf(new_status_file, "%s: %s\n", name, value);
749                 }
750         }
751         return;
752 }
753
754 /* This could do with a cleanup */
755 void write_status_file(deb_file_t **deb_file)
756 {
757         FILE *old_status_file = xfopen("/var/lib/dpkg/status", "r");
758         FILE *new_status_file = xfopen("/var/lib/dpkg/status.udeb", "w");
759         char *package_name;
760         char *status_from_file;
761         char *control_buffer = NULL;
762         char *tmp_string;
763         int status_num;
764         int field_start = 0;
765         int write_flag;
766         int i = 0;
767
768         /* Update previously known packages */
769         while ((control_buffer = fgets_str(old_status_file, "\n\n")) != NULL) {
770                 if ((tmp_string = strstr(control_buffer, "Package:")) == NULL) {
771                         continue;
772                 }
773
774                 tmp_string += 8;
775                 tmp_string += strspn(tmp_string, " \n\t");
776                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n\0"));
777                 write_flag = FALSE;
778                 tmp_string = strstr(control_buffer, "Status:");
779                 if (tmp_string != NULL) {
780                         /* Seperate the status value from the control buffer */
781                         tmp_string += 7;
782                         tmp_string += strspn(tmp_string, " \n\t");
783                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
784                 } else {
785                         status_from_file = NULL;
786                 }
787
788                 /* Find this package in the status hashtable */
789                 status_num = search_status_hashtable(package_name);
790                 if (status_hashtable[status_num] != NULL) {
791                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
792                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
793                                 /* New status isnt exactly the same as old status */
794                                 const int state_status = get_status(status_num, 3);
795                                 if ((strcmp("installed", name_hashtable[state_status]) == 0) ||
796                                         (strcmp("unpacked", name_hashtable[state_status]) == 0)) {
797                                         /* We need to add the control file from the package */
798                                         i = 0;
799                                         while(deb_file[i] != NULL) {
800                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
801                                                         /* Write a status file entry with a modified status */
802                                                         /* remove trailing \n's */
803                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
804                                                         set_status(status_num, "ok", 2);
805                                                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
806                                                         write_flag = TRUE;
807                                                         break;
808                                                 }
809                                                 i++;
810                                         }
811                                         /* This is temperary, debugging only */
812                                         if (deb_file[i] == NULL) {
813                                                 error_msg_and_die("ALERT: Couldnt find a control file, your status file may be broken, status may be incorrect for %s", package_name);
814                                         }
815                                 }
816                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
817                                         /* Only write the Package, Status, Priority and Section lines */
818                                         fprintf(new_status_file, "Package: %s\n", package_name);
819                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
820
821                                         while (1) {
822                                                 char *field_name;
823                                                 char *field_value;
824                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
825                                                 if (field_name == NULL) {
826                                                         break;
827                                                 }
828                                                 if ((strcmp(field_name, "Priority") == 0) ||
829                                                         (strcmp(field_name, "Section") == 0)) {
830                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
831                                                 }
832                                         }
833                                         write_flag = TRUE;
834                                         fputs("\n", new_status_file);
835                                 }
836                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
837                                         /* only change the status line */
838                                         while (1) {
839                                                 char *field_name;
840                                                 char *field_value;
841                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
842                                                 if (field_name == NULL) {
843                                                         break;
844                                                 }
845                                                 /* Setup start point for next field */
846                                                 if (strcmp(field_name, "Status") == 0) {
847                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
848                                                 } else {
849                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
850                                                 }
851                                         }
852                                         write_flag = TRUE;
853                                         fputs("\n", new_status_file);
854                                 }
855                         }
856                 }
857                 /* If the package from the status file wasnt handle above, do it now*/
858                 if (! write_flag) {
859                         fprintf(new_status_file, "%s\n\n", control_buffer);
860                 }
861
862                 free(status_from_file);
863                 free(package_name);
864                 free(control_buffer);
865         }
866
867         /* Write any new packages */
868         for(i = 0; deb_file[i] != NULL; i++) {
869                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
870                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
871                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
872                         set_status(status_num, "ok", 2);
873                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
874                 }
875         }
876         fclose(old_status_file);
877         fclose(new_status_file);
878
879
880         /* Create a seperate backfile to dpkg */
881         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
882                 struct stat stat_buf;   
883                 if (stat("/var/lib/dpkg/status", &stat_buf) == 0) {
884                         error_msg_and_die("Couldnt create backup status file");
885                 }
886                 /* Its ok if renaming the status file fails becasue status 
887                  * file doesnt exist, maybe we are starting from scratch */
888                 error_msg("No status file found, creating new one");
889         }
890
891         if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
892                 error_msg_and_die("DANGER: Couldnt create status file, you need to manually repair your status file");
893         }
894 }
895
896 int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
897 {
898         int *conflicts = NULL;
899         int conflicts_num = 0;
900         int state_status;
901         int state_flag;
902         int state_want;
903         int i = deb_start;
904         int j;
905
906         /* Check for conflicts
907          * TODO: TEST if conflicts with other packages to be installed
908          *
909          * Add install packages and the packages they provide
910          * to the list of files to check conflicts for
911          */
912
913         /* Create array of package numbers to check against
914          * installed package for conflicts*/
915         while (deb_file[i] != NULL) {
916                 const unsigned int package_num = deb_file[i]->package;
917                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
918                 conflicts[conflicts_num] = package_num;
919                 conflicts_num++;
920                 /* add provides to conflicts list */
921                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
922                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
923                                 const int conflicts_package_num = search_package_hashtable(
924                                         package_hashtable[package_num]->edge[j]->name,
925                                         package_hashtable[package_num]->edge[j]->version,
926                                         package_hashtable[package_num]->edge[j]->operator);
927                                 if (package_hashtable[conflicts_package_num] == NULL) {
928                                         /* create a new package */
929                                         common_node_t *new_node = (common_node_t *) xmalloc(sizeof(common_node_t));
930                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
931                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
932                                         new_node->num_of_edges = 0;
933                                         new_node->edge = NULL;
934                                         package_hashtable[conflicts_package_num] = new_node;
935                                 }
936                                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
937                                 conflicts[conflicts_num] = conflicts_package_num;
938                                 conflicts_num++;
939                         }
940                 }
941                 i++;
942         }
943
944         /* Check conflicts */
945         i = 0;
946         while (deb_file[i] != NULL) {
947                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
948                 int status_num = 0;
949                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
950
951                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
952                         i++;
953                         continue;
954                 }
955
956                 for (j = 0; j < package_node->num_of_edges; j++) {
957                         const edge_t *package_edge = package_node->edge[j];
958                         const unsigned int package_num = 
959                         search_package_hashtable(package_edge->name,
960                                 package_edge->version, package_edge->operator); 
961
962                         if (package_edge->type == EDGE_CONFLICTS) {
963                                 int result = 0;
964                                 if (package_hashtable[package_num] != NULL) {
965                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
966                                         state_status = get_status(status_num, 3);
967                                         state_flag = get_status(status_num, 1);
968
969                                         result = (state_status == search_name_hashtable("installed")) || 
970                                                 (state_flag == search_name_hashtable("want-install"));
971
972                                         if (result) {
973                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
974                                                         package_edge->version, package_edge->operator);
975                                         }
976                                 }
977
978                                 if (result) {
979                                         error_msg_and_die("Package %s conflicts with %s",
980                                                 name_hashtable[package_node->name],
981                                                 name_hashtable[package_edge->name]);
982                                 }
983                         }
984                 }
985                 i++;
986         }           
987
988
989         /* Check dependendcies */
990         i = 0;
991         while (deb_file[i] != NULL) {
992                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
993                 int status_num = 0;
994
995                 status_num = search_status_hashtable(name_hashtable[package_node->name]);         
996                 state_status = get_status(status_num, 3);
997                 state_want = get_status(status_num, 1);
998
999                 if (state_status == search_name_hashtable("installed")) {
1000                         i++;
1001                         continue;
1002                 }
1003
1004                 for (j = 0; j < package_hashtable[deb_file[i]->package]->num_of_edges; j++) {
1005                         const edge_t *package_edge = package_node->edge[j];
1006                         unsigned int package_num;
1007
1008                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1009
1010                         switch (package_edge->type) {
1011                                 case(EDGE_PRE_DEPENDS):
1012                                 case(EDGE_OR_PRE_DEPENDS): {
1013                                         int result=1;
1014                                         /* It must be already installed */
1015                                         /* NOTE: This is untested, nothing apropriate in my status file */
1016                                         if (package_hashtable[package_num] != NULL) {
1017                                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1018                                                 state_status = get_status(status_num, 3);
1019                                                 state_want = get_status(status_num, 1);
1020                                                 result = (state_status != search_name_hashtable("installed"));
1021                                         }
1022
1023                                         if (result) {
1024                                                 error_msg_and_die("Package %s pre-depends on %s, but it is not installed",
1025                                                         name_hashtable[package_node->name],
1026                                                         name_hashtable[package_edge->name]);
1027                                         }
1028                                         break;
1029                                 }
1030                                 case(EDGE_DEPENDS):
1031                                 case(EDGE_OR_DEPENDS): {
1032                                         int result=1;
1033                                         if (package_hashtable[package_num] != NULL) {
1034                                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1035                                                 state_status = get_status(status_num, 3);
1036                                                 state_want = get_status(status_num, 1);
1037                                                 result=(state_status != search_name_hashtable("installed")) && (state_want != search_name_hashtable("want-install"));
1038                                         }
1039                                         /* It must be already installed, or to be installed */
1040                                         if (result) {
1041                                                 error_msg_and_die("Package %s depends on %s, but it is not installed, or flaged to be installed",
1042                                                         name_hashtable[package_node->name],
1043                                                         name_hashtable[package_edge->name]);
1044                                         }
1045                                         break;
1046                                 }
1047                         }
1048                 }
1049                 i++;
1050         }
1051         free(conflicts);
1052         return(TRUE);
1053 }
1054
1055 char **create_list(const char *filename)
1056 {
1057         FILE *list_stream;
1058         char **file_list = NULL;
1059         char *line = NULL;
1060         int count = 0;
1061
1062         /* dont use [xw]fopen here, handle error ourself */
1063         list_stream = fopen(filename, "r");
1064         if (list_stream == NULL) {
1065                 return(NULL);
1066         }
1067
1068         while ((line = get_line_from_file(list_stream)) != NULL) {
1069                 file_list = xrealloc(file_list, sizeof(char *) * (count + 2));
1070                 chomp(line);
1071                 file_list[count] = line;
1072                 count++;
1073         }
1074         fclose(list_stream);
1075
1076         if (count == 0) {
1077                 return(NULL);
1078         } else {
1079                 file_list[count] = NULL;
1080                 return(file_list);
1081         }
1082 }
1083
1084 /* maybe i should try and hook this into remove_file.c somehow */
1085 int remove_file_array(char **remove_names, char **exclude_names)
1086 {
1087         struct stat path_stat;
1088         int match_flag;
1089         int remove_flag = FALSE;
1090         int i,j;
1091
1092         if (remove_names == NULL) {
1093                 return(FALSE);
1094         }
1095         for (i = 0; remove_names[i] != NULL; i++) {
1096                 match_flag = FALSE;
1097                 if (exclude_names != NULL) {
1098                         for (j = 0; exclude_names[j] != 0; j++) {
1099                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1100                                         match_flag = TRUE;
1101                                         break;
1102                                 }
1103                         }
1104                 }
1105                 if (!match_flag) {
1106                         if (lstat(remove_names[i], &path_stat) < 0) {
1107                                 continue;
1108                         }
1109                         if (S_ISDIR(path_stat.st_mode)) {
1110                                 if (rmdir(remove_names[i]) != -1) {
1111                                         remove_flag = TRUE;
1112                                 }
1113                         } else {
1114                                 if (unlink(remove_names[i]) != -1) {
1115                                         remove_flag = TRUE;
1116                                 }
1117                         }
1118                 }
1119         }
1120         return(remove_flag);
1121 }
1122
1123 int run_package_script(const char *package_name, const char *script_type)
1124 {
1125         struct stat path_stat;
1126         char *script_path;
1127         int result;
1128
1129         script_path = xmalloc(strlen(package_name) + strlen(script_type) + 21);
1130         sprintf(script_path, "/var/lib/dpkg/info/%s.%s", package_name, script_type);
1131
1132         /* If the file doesnt exist is isnt a fatal */
1133         if (lstat(script_path, &path_stat) < 0) {
1134                 result = EXIT_SUCCESS;
1135         } else {
1136                 result = system(script_path);
1137         }
1138         free(script_path);
1139         return(result);
1140 }
1141
1142 char **all_control_list(const char *package_name)
1143 {
1144         const char *extensions[11] = {"preinst", "postinst", "prerm", "postrm",
1145                 "list", "md5sums", "shlibs", "conffiles", "config", "templates", NULL };
1146         unsigned short i = 0;
1147         char **remove_files;
1148
1149         /* Create a list of all /var/lib/dpkg/info/<package> files */
1150         remove_files = malloc(sizeof(char *) * 11);
1151         while (extensions[i]) {
1152                 remove_files[i] = xmalloc(strlen(package_name) + strlen(extensions[i]) + 21);
1153                 sprintf(remove_files[i], "/var/lib/dpkg/info/%s.%s", package_name, extensions[i]);
1154                 i++;
1155         }
1156         remove_files[10] = NULL;
1157
1158         return(remove_files);
1159 }
1160
1161 void free_array(char **array)
1162 {
1163         
1164         if (array) {
1165                 unsigned short i = 0;
1166                 while (array[i]) {
1167                         free(array[i]);
1168                         i++;
1169                 }
1170                 free(array);
1171         }
1172 }
1173
1174 /* This function lists information on the installed packages. It loops through
1175  * the status_hashtable to retrieve the info. This results in smaller code than
1176  * scanning the status file. The resulting list, however, is unsorted. 
1177  */
1178 void list_packages(void)
1179 {
1180         int i;
1181
1182         printf("    Name           Version\n");
1183         printf("+++-==============-==============\n");
1184         
1185         /* go through status hash, dereference package hash and finally strings */
1186         for (i=0; i<STATUS_HASH_PRIME+1; i++) {
1187
1188                 if (status_hashtable[i]) {
1189                         const char *stat_str;  /* status string */
1190                         const char *name_str;  /* package name */
1191                         const char *vers_str;  /* version */
1192                         char  s1, s2;          /* status abbreviations */
1193                         int   spccnt;          /* space count */      
1194                         int   j;
1195                         
1196                         stat_str = name_hashtable[status_hashtable[i]->status];
1197                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1198                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1199                         
1200                         /* get abbreviation for status field 1 */
1201                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1202                         
1203                         /* get abbreviation for status field 2 */
1204                         for (j=0, spccnt=0; stat_str[j] && spccnt<2; j++) {
1205                                 if (stat_str[j] == ' ') spccnt++;
1206                         }
1207                         s2 = stat_str[j];
1208                         
1209                         /* print out the line formatted like Debian dpkg */
1210                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1211                 }
1212     }
1213 }
1214
1215 void remove_package(const unsigned int package_num)
1216 {
1217         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1218         const unsigned int status_num = search_status_hashtable(package_name);
1219         const int package_name_length = strlen(package_name);
1220         char **remove_files;
1221         char **exclude_files;
1222         char list_name[package_name_length + 25];
1223         char conffile_name[package_name_length + 30];
1224         int return_value;
1225
1226         printf("Removing %s ...\n", package_name);
1227
1228         /* run prerm script */
1229         return_value = run_package_script(package_name, "prerm");
1230         if (return_value == -1) {
1231                 error_msg_and_die("script failed, prerm failure");
1232         }
1233
1234         /* Create a list of files to remove, and a seperate list of those to keep */
1235         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1236         remove_files = create_list(list_name);
1237
1238         sprintf(conffile_name, "/var/lib/dpkg/info/%s.conffiles", package_name);
1239         exclude_files = create_list(conffile_name);
1240
1241         /* Some directories cant be removed straight away, so do multiple passes */
1242         while (remove_file_array(remove_files, exclude_files));
1243         free_array(exclude_files);
1244         free_array(remove_files);
1245
1246         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1247         exclude_files = xmalloc(sizeof(char*) * 3);
1248         exclude_files[0] = xstrdup(conffile_name);
1249         exclude_files[1] = xmalloc(package_name_length + 27);
1250         sprintf(exclude_files[1], "/var/lib/dpkg/info/%s.postrm", package_name);
1251         exclude_files[2] = NULL;
1252
1253         /* Create a list of all /var/lib/dpkg/info/<package> files */
1254         remove_files = all_control_list(package_name);
1255
1256         remove_file_array(remove_files, exclude_files);
1257         free_array(remove_files);
1258         free_array(exclude_files);
1259
1260         /* rename <package>.conffile to <package>.list */
1261         rename(conffile_name, list_name);
1262
1263         /* Change package status */
1264         set_status(status_num, "deinstall", 1);
1265         set_status(status_num, "config-files", 3);
1266 }
1267
1268 void purge_package(const unsigned int package_num)
1269 {
1270         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1271         const unsigned int status_num = search_status_hashtable(package_name);
1272         char **remove_files;
1273         char **exclude_files;
1274         char list_name[strlen(package_name) + 25];
1275
1276         /* run prerm script */
1277         if (run_package_script(package_name, "prerm") != 0) {
1278                 error_msg_and_die("script failed, prerm failure");
1279         }
1280
1281         /* Create a list of files to remove */
1282         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1283         remove_files = create_list(list_name);
1284
1285         exclude_files = xmalloc(sizeof(char*));
1286         exclude_files[0] = NULL;
1287
1288         /* Some directories cant be removed straight away, so do multiple passes */
1289         while (remove_file_array(remove_files, exclude_files));
1290         free_array(remove_files);
1291
1292         /* Create a list of all /var/lib/dpkg/info/<package> files */
1293         remove_files = all_control_list(package_name);
1294         remove_file_array(remove_files, exclude_files);
1295         free_array(remove_files);
1296         free(exclude_files);
1297
1298         /* run postrm script */
1299         if (run_package_script(package_name, "postrm") == -1) {
1300                 error_msg_and_die("postrm fialure.. set status to what?");
1301         }
1302
1303         /* Change package status */
1304         set_status(status_num, "purge", 1);
1305         set_status(status_num, "not-installed", 3);
1306 }
1307
1308 static archive_handle_t *init_archive_deb_ar(const char *filename)
1309 {
1310         archive_handle_t *ar_handle;
1311
1312         /* Setup an ar archive handle that refers to the gzip sub archive */    
1313         ar_handle = init_handle();
1314         ar_handle->filter = filter_accept_list_reassign;
1315         ar_handle->src_fd = xopen(filename, O_RDONLY);
1316
1317         return(ar_handle);      
1318 }
1319
1320 static void init_archive_deb_control(archive_handle_t *ar_handle)
1321 {
1322         archive_handle_t *tar_handle;
1323
1324         /* Setup the tar archive handle */
1325         tar_handle = init_handle();
1326         tar_handle->filter = filter_accept_list;
1327         tar_handle->src_fd = ar_handle->src_fd;
1328
1329         /* We dont care about data.tar.* or debian-binary, just control.tar.* */
1330 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1331         ar_handle->accept = llist_add_to(NULL, "control.tar.gz");
1332 #endif
1333 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1334         ar_handle->accept = llist_add_to(ar_handle->accept, "control.tar.bz2");
1335 #endif
1336
1337         /* Assign the tar handle as a subarchive of the ar handle */
1338         ar_handle->sub_archive = tar_handle;
1339
1340         return; 
1341 }
1342
1343 static void init_archive_deb_data(archive_handle_t *ar_handle)
1344 {
1345         archive_handle_t *tar_handle;
1346
1347         /* Setup the tar archive handle */
1348         tar_handle = init_handle();
1349         tar_handle->filter = filter_accept_all;
1350         tar_handle->src_fd = ar_handle->src_fd;
1351
1352         /* We dont care about data.tar.* or debian-binary, just control.tar.* */
1353 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1354         tar_handle->accept = llist_add_to(NULL, "data.tar.gz");
1355 #endif
1356 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1357         tar_handle->accept = llist_add_to(ar_handle->accept, "data.tar.bz2");
1358 #endif
1359
1360         /* Assign the tar handle as a subarchive of the ar handle */
1361         ar_handle->sub_archive = tar_handle;
1362
1363         return; 
1364 }
1365
1366 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *accept)
1367 {
1368         ar_handle->sub_archive->action_data = data_extract_to_buffer;
1369         ar_handle->sub_archive->accept = accept;
1370
1371         unpack_ar_archive(ar_handle);
1372         close(ar_handle->src_fd);
1373
1374         return(ar_handle->sub_archive->buffer);
1375 }
1376
1377 static void data_extract_all_prefix(archive_handle_t *archive_handle)
1378 {
1379         char *name_ptr = archive_handle->file_header->name;
1380
1381         name_ptr += strspn(name_ptr, "./");
1382         if (name_ptr[0] != '\0') {
1383                 archive_handle->file_header->name = xmalloc(strlen(archive_handle->buffer) + 2 + strlen(name_ptr));
1384                 strcpy(archive_handle->file_header->name, archive_handle->buffer);
1385                 strcat(archive_handle->file_header->name, name_ptr);
1386                 data_extract_all(archive_handle);
1387         }
1388         return;
1389 }
1390
1391 static void unpack_package(deb_file_t *deb_file)
1392 {
1393         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1394         const unsigned int status_num = search_status_hashtable(package_name);
1395         const unsigned int status_package_num = status_hashtable[status_num]->package;
1396         char *info_prefix;
1397         archive_handle_t *archive_handle;
1398         FILE *out_stream;
1399
1400         /* If existing version, remove it first */
1401         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1402                 /* Package is already installed, remove old version first */
1403                 printf("Preparing to replace %s %s (using %s) ...\n", package_name,
1404                         name_hashtable[package_hashtable[status_package_num]->version],
1405                         deb_file->filename);
1406                 remove_package(status_package_num);
1407         } else {
1408                 printf("Unpacking %s (from %s) ...\n", package_name, deb_file->filename);
1409         }
1410
1411         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1412         info_prefix = (char *) xmalloc(strlen(package_name) + 20 + 4 + 2);
1413         sprintf(info_prefix, "/var/lib/dpkg/info/%s.", package_name);
1414         archive_handle = init_archive_deb_ar(deb_file->filename);
1415         init_archive_deb_control(archive_handle);
1416         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1417         archive_handle->sub_archive->buffer = info_prefix;
1418         unpack_ar_archive(archive_handle);
1419
1420         /* Run the preinst prior to extracting */
1421         if (run_package_script(package_name, "preinst") != 0) {
1422                 /* when preinst returns exit code != 0 then quit installation process */
1423                 error_msg_and_die("subprocess pre-installation script returned error.");
1424         }       
1425
1426         /* Extract data.tar.gz to the root directory */
1427         archive_handle = init_archive_deb_ar(deb_file->filename);
1428         init_archive_deb_data(archive_handle);
1429         unpack_ar_archive(archive_handle);
1430
1431         /* Create the list file */
1432         strcat(info_prefix, "list");
1433         out_stream = xfopen(info_prefix, "w");                  
1434         while (archive_handle->passed) {
1435                 /* blindly skip over the leading '.' */
1436                 fputs(archive_handle->passed->data + 1, out_stream);
1437                 fputc('\n', out_stream);
1438                 archive_handle->passed = archive_handle->passed->link;
1439         }
1440         fclose(out_stream);
1441
1442         /* change status */
1443         set_status(status_num, "install", 1);
1444         set_status(status_num, "unpacked", 3);
1445
1446         free(info_prefix);
1447 }
1448
1449 void configure_package(deb_file_t *deb_file)
1450 {
1451         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1452         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1453         const int status_num = search_status_hashtable(package_name);
1454
1455         printf("Setting up %s (%s)\n", package_name, package_version);
1456
1457         /* Run the postinst script */
1458         if (run_package_script(package_name, "postinst") != 0) {
1459                 /* TODO: handle failure gracefully */
1460                 error_msg_and_die("postrm failure.. set status to what?");
1461         }
1462         /* Change status to reflect success */
1463         set_status(status_num, "install", 1);
1464         set_status(status_num, "installed", 3);
1465 }
1466
1467 int dpkg_main(int argc, char **argv)
1468 {
1469         deb_file_t **deb_file = NULL;
1470         status_node_t *status_node;
1471         int opt;
1472         int package_num;
1473         int dpkg_opt = 0;
1474         int deb_count = 0;
1475         int state_status;
1476         int status_num;
1477         int i;
1478
1479         while ((opt = getopt(argc, argv, "CF:ilPru")) != -1) {
1480                 switch (opt) {
1481                         case 'C': // equivalent to --configure in official dpkg
1482                                 dpkg_opt |= dpkg_opt_configure;
1483                                 dpkg_opt |= dpkg_opt_package_name;
1484                                 break;
1485                         case 'F': // equivalent to --force in official dpkg
1486                                 if (strcmp(optarg, "depends") == 0) {
1487                                         dpkg_opt |= dpkg_opt_force_ignore_depends;
1488                                 }                               
1489                         case 'i':
1490                                 dpkg_opt |= dpkg_opt_install;
1491                                 dpkg_opt |= dpkg_opt_filename;
1492                                 break;
1493                         case 'l':
1494                                 dpkg_opt |= dpkg_opt_list_installed;
1495                                 break;
1496                         case 'P':
1497                                 dpkg_opt |= dpkg_opt_purge;
1498                                 dpkg_opt |= dpkg_opt_package_name;
1499                                 break;
1500                         case 'r':
1501                                 dpkg_opt |= dpkg_opt_remove;
1502                                 dpkg_opt |= dpkg_opt_package_name;
1503                                 break;
1504                         case 'u':       /* Equivalent to --unpack in official dpkg */
1505                                 dpkg_opt |= dpkg_opt_unpack;
1506                                 dpkg_opt |= dpkg_opt_filename;
1507                                 break;
1508                         default:
1509                                 show_usage();
1510                 }
1511         }
1512         /* check for non-otion argument if expected  */
1513         if ((dpkg_opt == 0) || ((argc == optind) && !(dpkg_opt && dpkg_opt_list_installed))) {
1514                 show_usage();
1515         }
1516
1517 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1518         index_status_file("/var/lib/dpkg/status");
1519
1520         /* if the list action was given print the installed packages and exit */
1521         if (dpkg_opt & dpkg_opt_list_installed) {
1522                 list_packages();
1523                 return(EXIT_SUCCESS);
1524         }
1525         
1526         /* Read arguments and store relevant info in structs */
1527         while (optind < argc) {
1528                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1529                 deb_file = xrealloc(deb_file, sizeof(deb_file_t *) * (deb_count + 2));
1530                 deb_file[deb_count] = (deb_file_t *) xmalloc(sizeof(deb_file_t));
1531                 if (dpkg_opt & dpkg_opt_filename) {
1532                         archive_handle_t *archive_handle;
1533                         llist_t *control_list = NULL;
1534
1535                         /* Extract the control file */
1536                         control_list = llist_add_to(NULL, "./control");
1537                         archive_handle = init_archive_deb_ar(argv[optind]);
1538                         init_archive_deb_control(archive_handle);
1539                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1540                         if (deb_file[deb_count]->control_file == NULL) {
1541                                 error_msg_and_die("Couldnt extract control file");
1542                         }
1543                         deb_file[deb_count]->filename = xstrdup(argv[optind]);
1544                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1545
1546                         if (package_num == -1) {
1547                                 error_msg("Invalid control file in %s", argv[optind]);
1548                                 continue;
1549                         }
1550                         deb_file[deb_count]->package = (unsigned int) package_num;
1551
1552                         /* Add the package to the status hashtable */
1553                         if ((dpkg_opt & dpkg_opt_unpack) || (dpkg_opt & dpkg_opt_install)) {
1554                                 status_node = (status_node_t *) xmalloc(sizeof(status_node_t));
1555                                 status_node->package = deb_file[deb_count]->package;
1556                                 /* Try and find a currently installed version of this package */
1557                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1558                                 /* If no previous entry was found initialise a new entry */
1559                                 if ((status_hashtable[status_num] == NULL) ||
1560                                         (status_hashtable[status_num]->status == 0)) {
1561                                         /* reinstreq isnt changed to "ok" until the package control info
1562                                          * is written to the status file*/
1563                                         status_node->status = search_name_hashtable("want-install reinstreq not-installed");
1564                                         status_hashtable[status_num] = status_node;
1565                                 } else {
1566                                         status_hashtable[status_num]->status = search_name_hashtable("want-install reinstreq not-installed");
1567                                 }
1568                         }
1569                 }
1570                 else if (dpkg_opt & dpkg_opt_package_name) {
1571                         deb_file[deb_count]->filename = NULL;
1572                         deb_file[deb_count]->control_file = NULL;
1573                         deb_file[deb_count]->package = search_package_hashtable(
1574                                 search_name_hashtable(argv[optind]),
1575                                 search_name_hashtable("ANY"), VER_ANY);
1576                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1577                                 error_msg_and_die("Package %s is uninstalled or unknown\n", argv[optind]);
1578                         }
1579                         state_status = get_status(search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]), 3);
1580
1581                         /* check package status is "installed" */
1582                         if (dpkg_opt & dpkg_opt_remove) {
1583                                 if ((strcmp(name_hashtable[state_status], "not-installed") == 0) ||
1584                                         (strcmp(name_hashtable[state_status], "config-files") == 0)) {
1585                                         error_msg_and_die("%s is already removed.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1586                                 }
1587                         }
1588                         else if (dpkg_opt & dpkg_opt_purge) {
1589                                 /* if package status is "conf-files" then its ok */
1590                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1591                                         error_msg_and_die("%s is already purged.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1592                                 }
1593                         }
1594                 }
1595                 deb_count++;
1596                 optind++;
1597         }
1598         deb_file[deb_count] = NULL;
1599
1600         /* Check that the deb file arguments are installable */
1601         /* TODO: check dependencies before removing */
1602         if ((dpkg_opt & dpkg_opt_force_ignore_depends) != dpkg_opt_force_ignore_depends) {
1603                 if (!check_deps(deb_file, 0, deb_count)) {
1604                         error_msg_and_die("Dependency check failed");
1605                 }
1606         }
1607
1608         for (i = 0; i < deb_count; i++) {
1609                 /* Remove or purge packages */
1610                 if (dpkg_opt & dpkg_opt_remove) {
1611                         remove_package(deb_file[i]->package);
1612                 }
1613                 else if (dpkg_opt & dpkg_opt_purge) {
1614                         purge_package(deb_file[i]->package);
1615                 }
1616                 else if (dpkg_opt & dpkg_opt_unpack) {
1617                         unpack_package(deb_file[i]);
1618                 }
1619                 else if (dpkg_opt & dpkg_opt_install) {
1620                         unpack_package(deb_file[i]);
1621                         configure_package(deb_file[i]);
1622                 }
1623                 else if (dpkg_opt & dpkg_opt_configure) {
1624                         configure_package(deb_file[i]);
1625                 }
1626         }
1627
1628         write_status_file(deb_file);
1629
1630         for (i = 0; i < deb_count; i++) {
1631                 free(deb_file[i]->control_file);
1632                 free(deb_file[i]->filename);
1633                 free(deb_file[i]);
1634         }
1635
1636         free(deb_file);
1637
1638         for (i = 0; i < NAME_HASH_PRIME; i++) {
1639                 free(name_hashtable[i]);
1640         }
1641
1642         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1643                 if (package_hashtable[i] != NULL) {
1644                         free_package(package_hashtable[i]);
1645                 }
1646         }
1647
1648         for (i = 0; i < STATUS_HASH_PRIME; i++) {
1649                 free(status_hashtable[i]);
1650         }
1651
1652         return(EXIT_SUCCESS);
1653 }
1654