summaryrefslogtreecommitdiffstats
path: root/src/deb/build.c
blob: 1f0c050eea0a35bddb230271bf6f4d78d35bd220 (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
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
/*
 * dpkg-deb - construction and deconstruction of *.deb archives
 * build.c - building archives
 *
 * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
 * Copyright © 2000,2001 Wichert Akkerman <wakkerma@debian.org>
 * Copyright © 2007-2015 Guillem Jover <guillem@debian.org>
 *
 * This 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 of the License, or
 * (at your option) any later version.
 *
 * This 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <compat.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <errno.h>
#include <limits.h>
#include <inttypes.h>
#include <string.h>
#include <time.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>

#include <dpkg/i18n.h>
#include <dpkg/c-ctype.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/path.h>
#include <dpkg/treewalk.h>
#include <dpkg/varbuf.h>
#include <dpkg/fdio.h>
#include <dpkg/buffer.h>
#include <dpkg/subproc.h>
#include <dpkg/command.h>
#include <dpkg/compress.h>
#include <dpkg/ar.h>
#include <dpkg/options.h>

#include "dpkg-deb.h"

static void
control_treewalk_feed(const char *dir, int fd_out)
{
  struct treeroot *tree;
  struct treenode *node;

  tree = treewalk_open(dir, TREEWALK_NONE, NULL);
  for (node = treewalk_node(tree); node; node = treewalk_next(tree)) {
    char *nodename;

    nodename = str_fmt("./%s", treenode_get_virtname(node));
    if (fd_write(fd_out, nodename, strlen(nodename) + 1) < 0)
      ohshite(_("failed to write filename to tar pipe (%s)"),
              _("control member"));
    free(nodename);
  }
  treewalk_close(tree);
}

/**
 * Simple structure to store information about a file.
 */
struct file_info {
  struct file_info *next;
  char *fn;
};

static struct file_info *
file_info_new(const char *filename)
{
  struct file_info *fi;

  fi = m_malloc(sizeof(*fi));
  fi->fn = m_strdup(filename);
  fi->next = NULL;

  return fi;
}

static void
file_info_free(struct file_info *fi)
{
  free(fi->fn);
  free(fi);
}

static struct file_info *
file_info_find_name(struct file_info *list, const char *filename)
{
  struct file_info *node;

  for (node = list; node; node = node->next)
    if (strcmp(node->fn, filename) == 0)
      return node;

  return NULL;
}

/**
 * Add a new file_info struct to a single linked list of file_info structs.
 *
 * We perform a slight optimization to work around a ‘feature’ in tar: tar
 * always recurses into subdirectories if you list a subdirectory. So if an
 * entry is added and the previous entry in the list is its subdirectory we
 * remove the subdirectory.
 *
 * After a file_info struct is added to a list it may no longer be freed, we
 * assume full responsibility for its memory.
 */
static void
file_info_list_append(struct file_info **head, struct file_info **tail,
                      struct file_info *fi)
{
  if (*head == NULL)
    *head = *tail = fi;
  else
    *tail = (*tail)->next =fi;
}

/**
 * Free the memory for all entries in a list of file_info structs.
 */
static void
file_info_list_free(struct file_info *fi)
{
  while (fi) {
    struct file_info *fl;

    fl=fi; fi=fi->next;
    file_info_free(fl);
  }
}

static void
file_treewalk_feed(const char *dir, int fd_out)
{
  struct treeroot *tree;
  struct treenode *node;
  struct file_info *fi;
  struct file_info *symlist = NULL;
  struct file_info *symlist_end = NULL;

  tree = treewalk_open(dir, TREEWALK_NONE, NULL);
  for (node = treewalk_node(tree); node ; node = treewalk_next(tree)) {
    const char *virtname = treenode_get_virtname(node);
    char *nodename;

    if (strncmp(virtname, BUILDCONTROLDIR, strlen(BUILDCONTROLDIR)) == 0)
      continue;

    nodename = str_fmt("./%s", virtname);

    if (!opt_nocheck && strchr(nodename, '\n'))
      ohshit(_("newline not allowed in pathname '%s'"), nodename);

    /* We need to reorder the files so we can make sure that symlinks
     * will not appear before their target. */
    if (S_ISLNK(treenode_get_mode(node))) {
      fi = file_info_new(nodename);
      file_info_list_append(&symlist, &symlist_end, fi);
    } else if (fd_write(fd_out, nodename, strlen(nodename) + 1) < 0) {
      ohshite(_("failed to write filename to tar pipe (%s)"),
              _("data member"));
    }

    free(nodename);
  }
  treewalk_close(tree);

  for (fi = symlist; fi; fi = fi->next)
    if (fd_write(fd_out, fi->fn, strlen(fi->fn) + 1) < 0)
      ohshite(_("failed to write filename to tar pipe (%s)"), _("data member"));

  file_info_list_free(symlist);
}

static const char *const maintainerscripts[] = {
  PREINSTFILE,
  POSTINSTFILE,
  PRERMFILE,
  POSTRMFILE,
  MAINTSCRIPT_FILE_CONFIG,
  NULL,
};

/**
 * Check control directory and file permissions.
 */
static void
check_file_perms(const char *ctrldir)
{
  struct varbuf path = VARBUF_INIT;
  const char *const *mscriptp;
  struct stat mscriptstab;

  varbuf_printf(&path, "%s/", ctrldir);
  if (lstat(path.buf, &mscriptstab))
    ohshite(_("unable to stat control directory"));
  if (!S_ISDIR(mscriptstab.st_mode))
    ohshit(_("control directory is not a directory"));
  if ((mscriptstab.st_mode & 07757) != 0755)
    ohshit(_("control directory has bad permissions %03lo "
             "(must be >=0755 and <=0775)"),
           (unsigned long)(mscriptstab.st_mode & 07777));

  for (mscriptp = maintainerscripts; *mscriptp; mscriptp++) {
    varbuf_reset(&path);
    varbuf_printf(&path, "%s/%s", ctrldir, *mscriptp);
    if (!lstat(path.buf, &mscriptstab)) {
      if (S_ISLNK(mscriptstab.st_mode))
        continue;
      if (!S_ISREG(mscriptstab.st_mode))
        ohshit(_("maintainer script '%.50s' is not a plain file or symlink"),
               *mscriptp);
      if ((mscriptstab.st_mode & 07557) != 0555)
        ohshit(_("maintainer script '%.50s' has bad permissions %03lo "
                 "(must be >=0555 and <=0775)"),
               *mscriptp, (unsigned long)(mscriptstab.st_mode & 07777));
    } else if (errno != ENOENT) {
      ohshite(_("maintainer script '%.50s' is not stattable"), *mscriptp);
    }
  }

  varbuf_destroy(&path);
}

/**
 * Check if conffiles contains sane information.
 */
static void
check_conffiles(const char *ctrldir, const char *rootdir)
{
  FILE *cf;
  struct varbuf controlfile = VARBUF_INIT;
  char conffilenamebuf[MAXCONFFILENAME + 1];
  struct file_info *conffiles_head = NULL;
  struct file_info *conffiles_tail = NULL;

  varbuf_printf(&controlfile, "%s/%s", ctrldir, CONFFILESFILE);

  cf = fopen(controlfile.buf, "r");
  if (cf == NULL) {
    if (errno == ENOENT) {
      varbuf_destroy(&controlfile);
      return;
    }

    ohshite(_("error opening conffiles file"));
  }

  while (fgets(conffilenamebuf, MAXCONFFILENAME + 1, cf)) {
    struct stat controlstab;
    char *conffilename = conffilenamebuf;
    int n;
    bool remove_on_upgrade = false;

    n = strlen(conffilename);
    if (!n)
      ohshite(_("empty string from fgets reading conffiles"));

    if (conffilename[n - 1] != '\n')
      ohshit(_("conffile name '%s' is too long, or missing final newline"),
             conffilename);

    conffilename[--n] = '\0';

    if (c_isspace(conffilename[0])) {
      /* The conffiles lines cannot start with whitespace; by handling this
       * case now, we simplify the remaining code. Move past the whitespace
       * to give a better error. */
      while (c_isspace(conffilename[0]))
        conffilename++;
      if (conffilename[0] == '\0')
          ohshit(_("empty and whitespace-only lines are not allowed in "
                   "conffiles"));
      ohshit(_("line with conffile filename '%s' has leading white spaces"),
             conffilename);
    }

    if (conffilename[0] != '/') {
      char *flag = conffilename;
      char *flag_end = strchr(flag, ' ');

      if (flag_end) {
        conffilename = flag_end + 1;
        n -= conffilename - flag;
      }

      /* If no flag separator is found, assume a missing leading slash. */
      if (flag_end == NULL || (conffilename[0] && conffilename[0] != '/'))
        ohshit(_("conffile name '%s' is not an absolute pathname"), conffilename);

      flag_end[0] = '\0';

      /* Otherwise assume a missing filename after the flag separator. */
      if (conffilename[0] == '\0')
        ohshit(_("conffile name missing after flag '%s'"), flag);

      if (strcmp(flag, "remove-on-upgrade") == 0)
        remove_on_upgrade = true;
      else
        ohshit(_("unknown flag '%s' for conffile '%s'"), flag, conffilename);
    }

    varbuf_reset(&controlfile);
    varbuf_printf(&controlfile, "%s%s", rootdir, conffilename);
    if (lstat(controlfile.buf, &controlstab)) {
      if (errno == ENOENT) {
        if ((n > 1) && c_isspace(conffilename[n - 1]))
          warning(_("conffile filename '%s' contains trailing white spaces"),
                  conffilename);
        if (!remove_on_upgrade)
          ohshit(_("conffile '%.250s' does not appear in package"), conffilename);
      } else
        ohshite(_("conffile '%.250s' is not stattable"), conffilename);
    } else if (remove_on_upgrade) {
        ohshit(_("conffile '%s' is present but is requested to be removed"),
               conffilename);
    } else if (!S_ISREG(controlstab.st_mode)) {
      warning(_("conffile '%s' is not a plain file"), conffilename);
    }

    if (file_info_find_name(conffiles_head, conffilename)) {
      warning(_("conffile name '%s' is duplicated"), conffilename);
    } else {
      struct file_info *conffile;

      conffile = file_info_new(conffilename);
      file_info_list_append(&conffiles_head, &conffiles_tail, conffile);
    }
  }

  file_info_list_free(conffiles_head);
  varbuf_destroy(&controlfile);

  if (ferror(cf))
    ohshite(_("error reading conffiles file"));
  fclose(cf);
}

/**
 * Check the control file.
 *
 * @param ctrldir The directory from where to build the binary package.
 * @return The pkginfo struct from the parsed control file.
 */
static struct pkginfo *
check_control_file(const char *ctrldir)
{
  struct pkginfo *pkg;
  char *controlfile;

  controlfile = str_fmt("%s/%s", ctrldir, CONTROLFILE);
  parsedb(controlfile, pdb_parse_binary, &pkg);

  if (strspn(pkg->set->name, "abcdefghijklmnopqrstuvwxyz0123456789+-.") !=
      strlen(pkg->set->name))
    ohshit(_("package name has characters that aren't lowercase alphanums or '-+.'"));
  if (pkg->available.arch->type == DPKG_ARCH_NONE ||
      pkg->available.arch->type == DPKG_ARCH_EMPTY)
    ohshit(_("package architecture is missing or empty"));
  if (pkg->priority == PKG_PRIO_OTHER)
    warning(_("'%s' contains user-defined Priority value '%s'"),
            controlfile, pkg->otherpriority);

  free(controlfile);

  return pkg;
}

/**
 * Perform some sanity checks on the to-be-built package control area.
 *
 * @param ctrldir The directory from where to build the binary package.
 * @return The pkginfo struct from the parsed control file.
 */
static struct pkginfo *
check_control_area(const char *ctrldir, const char *rootdir)
{
  struct pkginfo *pkg;
  int warns;

  /* Start by reading in the control file so we can check its contents. */
  pkg = check_control_file(ctrldir);
  check_file_perms(ctrldir);
  check_conffiles(ctrldir, rootdir);

  warns = warning_get_count();
  if (warns)
    warning(P_("ignoring %d warning about the control file(s)",
               "ignoring %d warnings about the control file(s)", warns),
            warns);

  return pkg;
}

/**
 * Generate the pathname for the destination binary package.
 *
 * If the pathname cannot be computed, because the destination is a directory,
 * then NULL will be returned.
 *
 * @param dir	The directory from where to build the binary package.
 * @param dest	The destination name, either a file or directory name.
 * @return	The pathname for the package being built.
 */
static char *
gen_dest_pathname(const char *dir, const char *dest)
{
  if (dest) {
    struct stat dest_stab;

    if (stat(dest, &dest_stab)) {
      if (errno != ENOENT)
        ohshite(_("unable to check for existence of archive '%.250s'"), dest);
    } else if (S_ISDIR(dest_stab.st_mode)) {
      /* Need to compute the destination name from the package control file. */
      return NULL;
    }

    return m_strdup(dest);
  } else {
    char *pathname;

    pathname = m_malloc(strlen(dir) + sizeof(DEBEXT));
    strcpy(pathname, dir);
    path_trim_slash_slashdot(pathname);
    strcat(pathname, DEBEXT);

    return pathname;
  }
}

/**
 * Generate the pathname for the destination binary package from control file.
 *
 * @return The pathname for the package being built.
 */
static char *
gen_dest_pathname_from_pkg(const char *dir, struct pkginfo *pkg)
{
  return str_fmt("%s/%s_%s_%s%s", dir, pkg->set->name,
                 versiondescribe(&pkg->available.version, vdew_never),
                 pkg->available.arch->name, DEBEXT);
}

typedef void filenames_feed_func(const char *dir, int fd_out);

struct tar_pack_options {
  intmax_t timestamp;
  const char *mode;
  bool root_owner_group;
};

/**
 * Pack the contents of a directory into a tarball.
 */
static void
tarball_pack(const char *dir, filenames_feed_func *tar_filenames_feeder,
             struct tar_pack_options *options,
             struct compress_params *tar_compress_params, int fd_out)
{
  int pipe_filenames[2], pipe_tarball[2];
  pid_t pid_tar, pid_comp;

  /* Fork off a tar. We will feed it a list of filenames on stdin later. */
  m_pipe(pipe_filenames);
  m_pipe(pipe_tarball);
  pid_tar = subproc_fork();
  if (pid_tar == 0) {
    struct command cmd;
    char mtime[50];

    m_dup2(pipe_filenames[0], 0);
    close(pipe_filenames[0]);
    close(pipe_filenames[1]);
    m_dup2(pipe_tarball[1], 1);
    close(pipe_tarball[0]);
    close(pipe_tarball[1]);

    if (chdir(dir))
      ohshite(_("failed to chdir to '%.255s'"), dir);

    snprintf(mtime, sizeof(mtime), "@%jd", options->timestamp);

    command_init(&cmd, TAR, "tar -cf");
    command_add_args(&cmd, "tar", "-cf", "-", "--format=gnu",
                           "--mtime", mtime, "--clamp-mtime", NULL);
    /* Mode might become a positional argument, pass it before -T. */
    if (options->mode)
      command_add_args(&cmd, "--mode", options->mode, NULL);
    if (options->root_owner_group)
      command_add_args(&cmd, "--owner", "root:0", "--group", "root:0", NULL);
    command_add_args(&cmd, "--null", "--no-unquote", "--no-recursion",
                           "-T", "-", NULL);
    command_exec(&cmd);
  }
  close(pipe_filenames[0]);
  close(pipe_tarball[1]);

  /* Of course we should not forget to compress the archive as well. */
  pid_comp = subproc_fork();
  if (pid_comp == 0) {
    close(pipe_filenames[1]);
    compress_filter(tar_compress_params, pipe_tarball[0], fd_out,
                    _("compressing tar member"));
    exit(0);
  }
  close(pipe_tarball[0]);

  /* All the pipes are set, now lets start feeding filenames to tar. */
  tar_filenames_feeder(dir, pipe_filenames[1]);

  /* All done, clean up wait for tar and <compress> to finish their job. */
  close(pipe_filenames[1]);
  subproc_reap(pid_comp, _("<compress> from tar -cf"), 0);
  subproc_reap(pid_tar, "tar -cf", 0);
}

static intmax_t
parse_timestamp(const char *value)
{
  intmax_t timestamp;
  char *end;

  errno = 0;
  timestamp = strtoimax(value, &end, 10);
  if (value == end || *end || errno != 0)
    ohshite(_("unable to parse timestamp '%.255s'"), value);

  return timestamp;
}

/**
 * Overly complex function that builds a .deb file.
 */
int
do_build(const char *const *argv)
{
  struct compress_params control_compress_params;
  struct tar_pack_options tar_options;
  struct dpkg_error err;
  struct dpkg_ar *ar;
  intmax_t timestamp;
  const char *timestamp_str;
  const char *dir, *dest;
  char *ctrldir;
  char *debar;
  char *tfbuf;
  int gzfd;

  /* Decode our arguments. */
  dir = *argv++;
  if (!dir)
    badusage(_("--%s needs a <directory> argument"), cipaction->olong);

  dest = *argv++;
  if (dest && *argv)
    badusage(_("--%s takes at most two arguments"), cipaction->olong);

  debar = gen_dest_pathname(dir, dest);
  ctrldir = str_fmt("%s/%s", dir, BUILDCONTROLDIR);

  /* Perform some sanity checks on the to-be-build package. */
  if (opt_nocheck) {
    if (debar == NULL)
      ohshit(_("target is directory - cannot skip control file check"));
    warning(_("not checking contents of control area"));
    info(_("building an unknown package in '%s'."), debar);
  } else {
    struct pkginfo *pkg;

    pkg = check_control_area(ctrldir, dir);
    if (debar == NULL)
      debar = gen_dest_pathname_from_pkg(dest, pkg);
    info(_("building package '%s' in '%s'."), pkg->set->name, debar);
  }
  m_output(stdout, _("<standard output>"));

  timestamp_str = getenv("SOURCE_DATE_EPOCH");
  if (timestamp_str)
    timestamp = parse_timestamp(timestamp_str);
  else
    timestamp = time(NULL);

  /* Now that we have verified everything it is time to actually
   * build something. Let's start by making the ar-wrapper. */
  ar = dpkg_ar_create(debar, 0644);

  dpkg_ar_set_mtime(ar, timestamp);

  unsetenv("TAR_OPTIONS");

  /* Create a temporary file to store the control data in. Immediately
   * unlink our temporary file so others can't mess with it. */
  tfbuf = path_make_temp_template("dpkg-deb");
  gzfd = mkstemp(tfbuf);
  if (gzfd == -1)
    ohshite(_("failed to make temporary file (%s)"), _("control member"));
  /* Make sure it's gone, the fd will remain until we close it. */
  if (unlink(tfbuf))
    ohshit(_("failed to unlink temporary file (%s), %s"), _("control member"),
           tfbuf);
  free(tfbuf);

  /* Select the compressor to use for our control archive. */
  if (opt_uniform_compression) {
    control_compress_params = compress_params;
  } else {
    control_compress_params = compress_params_deb0;

    if (!compressor_check_params(&control_compress_params, &err))
      internerr("invalid control member compressor params: %s", err.str);
  }

  /* Fork a tar to package the control-section of the package. */
  tar_options.mode = "u+rw,go=rX";
  tar_options.timestamp = timestamp;
  tar_options.root_owner_group = true;
  tarball_pack(ctrldir, control_treewalk_feed, &tar_options,
               &control_compress_params, gzfd);

  free(ctrldir);

  if (lseek(gzfd, 0, SEEK_SET))
    ohshite(_("failed to rewind temporary file (%s)"), _("control member"));

  /* We have our first file for the ar-archive. Write a header for it
   * to the package and insert it. */
  if (deb_format.major == 0) {
    struct stat controlstab;
    char versionbuf[40];

    if (fstat(gzfd, &controlstab))
      ohshite(_("failed to stat temporary file (%s)"), _("control member"));
    sprintf(versionbuf, "%-8s\n%jd\n", OLDARCHIVEVERSION,
            (intmax_t)controlstab.st_size);
    if (fd_write(ar->fd, versionbuf, strlen(versionbuf)) < 0)
      ohshite(_("error writing '%s'"), debar);
    if (fd_fd_copy(gzfd, ar->fd, -1, &err) < 0)
      ohshit(_("cannot copy '%s' into archive '%s': %s"), _("control member"),
             ar->name, err.str);
  } else if (deb_format.major == 2) {
    const char deb_magic[] = ARCHIVEVERSION "\n";
    char adminmember[16 + 1];

    sprintf(adminmember, "%s%s", ADMINMEMBER,
            compressor_get_extension(control_compress_params.type));

    dpkg_ar_put_magic(ar);
    dpkg_ar_member_put_mem(ar, DEBMAGIC, deb_magic, strlen(deb_magic));
    dpkg_ar_member_put_file(ar, adminmember, gzfd, -1);
  } else {
    internerr("unknown deb format version %d.%d", deb_format.major, deb_format.minor);
  }

  close(gzfd);

  /* Control is done, now we need to archive the data. */
  if (deb_format.major == 0) {
    /* In old format, the data member is just concatenated after the
     * control member, so we do not need a temporary file and can use
     * the compression file descriptor. */
    gzfd = ar->fd;
  } else if (deb_format.major == 2) {
    /* Start by creating a new temporary file. Immediately unlink the
     * temporary file so others can't mess with it. */
    tfbuf = path_make_temp_template("dpkg-deb");
    gzfd = mkstemp(tfbuf);
    if (gzfd == -1)
      ohshite(_("failed to make temporary file (%s)"), _("data member"));
    /* Make sure it's gone, the fd will remain until we close it. */
    if (unlink(tfbuf))
      ohshit(_("failed to unlink temporary file (%s), %s"), _("data member"),
             tfbuf);
    free(tfbuf);
  } else {
    internerr("unknown deb format version %d.%d", deb_format.major, deb_format.minor);
  }

  /* Pack the directory into a tarball, feeding files from the callback. */
  tar_options.mode = NULL;
  tar_options.timestamp = timestamp;
  tar_options.root_owner_group = opt_root_owner_group;
  tarball_pack(dir, file_treewalk_feed, &tar_options, &compress_params, gzfd);

  /* Okay, we have data.tar as well now, add it to the ar wrapper. */
  if (deb_format.major == 2) {
    char datamember[16 + 1];

    sprintf(datamember, "%s%s", DATAMEMBER,
            compressor_get_extension(compress_params.type));

    if (lseek(gzfd, 0, SEEK_SET))
      ohshite(_("failed to rewind temporary file (%s)"), _("data member"));

    dpkg_ar_member_put_file(ar, datamember, gzfd, -1);

    close(gzfd);
  }
  if (fsync(ar->fd))
    ohshite(_("unable to sync file '%s'"), ar->name);

  dpkg_ar_close(ar);

  free(debar);

  return 0;
}