Rename libarchive-2/ to libarchive/. No need for it to be versioned.
[dragonfly.git] / contrib / libarchive / cpio / cpio.c
1 /*-
2  * Copyright (c) 2003-2007 Tim Kientzle
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer
10  *    in this position and unchanged.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27
28 #include "cpio_platform.h"
29 __FBSDID("$FreeBSD: src/usr.bin/cpio/cpio.c,v 1.4 2008/06/24 15:18:40 kientzle Exp $");
30
31 #include <sys/types.h>
32 #include <archive.h>
33 #include <archive_entry.h>
34
35 #ifdef HAVE_SYS_STAT_H
36 #include <sys/stat.h>
37 #endif
38 #ifdef HAVE_ERRNO_H
39 #include <errno.h>
40 #endif
41 #ifdef HAVE_FCNTL_H
42 #include <fcntl.h>
43 #endif
44 #ifdef HAVE_STDARG_H
45 #include <stdarg.h>
46 #endif
47 #include <stdio.h>
48 #ifdef HAVE_STDLIB_H
49 #include <stdlib.h>
50 #endif
51 #ifdef HAVE_STRING_H
52 #include <string.h>
53 #endif
54 #ifdef HAVE_UNISTD_H
55 #include <unistd.h>
56 #endif
57
58 #include "cpio.h"
59 #include "matching.h"
60
61 static int      copy_data(struct archive *, struct archive *);
62 static const char *cpio_rename(const char *name);
63 static int      entry_to_archive(struct cpio *, struct archive_entry *);
64 static int      file_to_archive(struct cpio *, const char *);
65 static void     long_help(void);
66 static void     mode_in(struct cpio *);
67 static void     mode_list(struct cpio *);
68 static void     mode_out(struct cpio *);
69 static void     mode_pass(struct cpio *, const char *);
70 static void     restore_time(struct cpio *, struct archive_entry *,
71                     const char *, int fd);
72 static void     usage(void);
73 static void     version(void);
74
75 int
76 main(int argc, char *argv[])
77 {
78         static char buff[16384];
79         struct cpio _cpio; /* Allocated on stack. */
80         struct cpio *cpio;
81         int uid, gid;
82         int opt;
83
84         cpio = &_cpio;
85         memset(cpio, 0, sizeof(*cpio));
86         cpio->buff = buff;
87         cpio->buff_size = sizeof(buff);
88
89         /* Need cpio_progname before calling cpio_warnc. */
90         if (*argv == NULL)
91                 cpio_progname = "bsdcpio";
92         else {
93                 cpio_progname = strrchr(*argv, '/');
94                 if (cpio_progname != NULL)
95                         cpio_progname++;
96                 else
97                         cpio_progname = *argv;
98         }
99
100         cpio->uid_override = -1;
101         cpio->gid_override = -1;
102         cpio->argv = argv;
103         cpio->argc = argc;
104         cpio->line_separator = '\n';
105         cpio->mode = '\0';
106         cpio->verbose = 0;
107         cpio->compress = '\0';
108         /* TODO: Implement old binary format in libarchive, use that here. */
109         cpio->format = "odc"; /* Default format */
110         cpio->extract_flags = ARCHIVE_EXTRACT_NO_AUTODIR;
111         cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
112         cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS;
113         cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT;
114         /* TODO: If run by root, set owner as well. */
115         cpio->bytes_per_block = 512;
116         cpio->filename = NULL;
117
118         while ((opt = cpio_getopt(cpio)) != -1) {
119                 switch (opt) {
120                 case '0': /* GNU convention: --null, -0 */
121                         cpio->line_separator = '\0';
122                         break;
123                 case 'A': /* NetBSD/OpenBSD */
124                         cpio->option_append = 1;
125                         break;
126                 case 'a': /* POSIX 1997 */
127                         cpio->option_atime_restore = 1;
128                         break;
129                 case 'B': /* POSIX 1997 */
130                         cpio->bytes_per_block = 5120;
131                         break;
132                 case 'C': /* NetBSD/OpenBSD */
133                         cpio->bytes_per_block = atoi(optarg);
134                         if (cpio->bytes_per_block <= 0)
135                                 cpio_errc(1, 0, "Invalid blocksize %s", optarg);
136                         break;
137                 case 'c': /* POSIX 1997 */
138                         cpio->format = "odc";
139                         break;
140                 case 'd': /* POSIX 1997 */
141                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_AUTODIR;
142                         break;
143                 case 'E': /* NetBSD/OpenBSD */
144                         include_from_file(cpio, optarg);
145                         break;
146                 case 'F': /* NetBSD/OpenBSD/GNU cpio */
147                         cpio->filename = optarg;
148                         break;
149                 case 'f': /* POSIX 1997 */
150                         exclude(cpio, optarg);
151                         break;
152                 case 'H': /* GNU cpio (also --format) */
153                         cpio->format = optarg;
154                         break;
155                 case 'h':
156                         long_help();
157                         break;
158                 case 'I': /* NetBSD/OpenBSD */
159                         cpio->filename = optarg;
160                         break;
161                 case 'i': /* POSIX 1997 */
162                         cpio->mode = opt;
163                         break;
164                 case OPTION_INSECURE:
165                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS;
166                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
167                         break;
168                 case 'L': /* GNU cpio */
169                         cpio->option_follow_links = 1;
170                         break;
171                 case 'l': /* POSIX 1997 */
172                         cpio->option_link = 1;
173                         break;
174                 case 'm': /* POSIX 1997 */
175                         cpio->extract_flags |= ARCHIVE_EXTRACT_TIME;
176                         break;
177                 case 'O': /* GNU cpio */
178                         cpio->filename = optarg;
179                         break;
180                 case 'o': /* POSIX 1997 */
181                         cpio->mode = opt;
182                         break;
183                 case 'p': /* POSIX 1997 */
184                         cpio->mode = opt;
185                         cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT;
186                         break;
187                 case OPTION_QUIET: /* GNU cpio */
188                         cpio->quiet = 1;
189                         break;
190                 case 'R': /* GNU cpio, also --owner */
191                         if (owner_parse(optarg, &uid, &gid))
192                                 usage();
193                         if (uid != -1)
194                                 cpio->uid_override = uid;
195                         if (gid != -1)
196                                 cpio->gid_override = gid;
197                         break;
198                 case 'r': /* POSIX 1997 */
199                         cpio->option_rename = 1;
200                         break;
201                 case 't': /* POSIX 1997 */
202                         cpio->option_list = 1;
203                         break;
204                 case 'u': /* POSIX 1997 */
205                         cpio->extract_flags
206                             &= ~ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
207                         break;
208                 case 'v': /* POSIX 1997 */
209                         cpio->verbose++;
210                         break;
211                 case OPTION_VERSION: /* GNU convention */
212                         version();
213                         break;
214 #if 0
215                 /*
216                  * cpio_getopt() handles -W specially, so it's not
217                  * available here.
218                  */
219                 case 'W': /* Obscure, but useful GNU convention. */
220                         break;
221 #endif
222                 case 'y': /* tar convention */
223                         cpio->compress = opt;
224                         break;
225                 case 'Z': /* tar convention */
226                         cpio->compress = opt;
227                         break;
228                 case 'z': /* tar convention */
229                         cpio->compress = opt;
230                         break;
231                 default:
232                         usage();
233                 }
234         }
235
236         /* TODO: Sanity-check args, error out on nonsensical combinations. */
237
238         cpio->argc -= optind;
239         cpio->argv += optind;
240
241         switch (cpio->mode) {
242         case 'o':
243                 mode_out(cpio);
244                 break;
245         case 'i':
246                 while (*cpio->argv != NULL) {
247                         include(cpio, *cpio->argv);
248                         --cpio->argc;
249                         ++cpio->argv;
250                 }
251                 if (cpio->option_list)
252                         mode_list(cpio);
253                 else
254                         mode_in(cpio);
255                 break;
256         case 'p':
257                 if (*cpio->argv == NULL || **cpio->argv == '\0')
258                         cpio_errc(1, 0,
259                             "-p mode requires a target directory");
260                 mode_pass(cpio, *cpio->argv);
261                 break;
262         default:
263                 cpio_errc(1, 0,
264                     "Must specify at least one of -i, -o, or -p");
265         }
266
267         return (0);
268 }
269
270 void
271 usage(void)
272 {
273         const char      *p;
274
275         p = cpio_progname;
276
277         fprintf(stderr, "Brief Usage:\n");
278         fprintf(stderr, "  List:    %s -it < archive\n", p);
279         fprintf(stderr, "  Extract: %s -i < archive\n", p);
280         fprintf(stderr, "  Create:  %s -o < filenames > archive\n", p);
281 #ifdef HAVE_GETOPT_LONG
282         fprintf(stderr, "  Help:    %s --help\n", p);
283 #else
284         fprintf(stderr, "  Help:    %s -h\n", p);
285 #endif
286         exit(1);
287 }
288
289 static const char *long_help_msg =
290         "First option must be a mode specifier:\n"
291         "  -i Input  -o Output  -p Pass\n"
292         "Common Options:\n"
293         "  -v    Verbose\n"
294         "Create: %p -o [options]  < [list of files] > [archive]\n"
295         "  -z, -y  Compress archive with gzip/bzip2\n"
296         "  --format {odc|newc|ustar}  Select archive format\n"
297         "List: %p -it < [archive]\n"
298         "Extract: %p -i [options] < [archive]\n";
299
300
301 /*
302  * Note that the word 'bsdcpio' will always appear in the first line
303  * of output.
304  *
305  * In particular, /bin/sh scripts that need to test for the presence
306  * of bsdcpio can use the following template:
307  *
308  * if (cpio --help 2>&1 | grep bsdcpio >/dev/null 2>&1 ) then \
309  *          echo bsdcpio; else echo not bsdcpio; fi
310  */
311 static void
312 long_help(void)
313 {
314         const char      *prog;
315         const char      *p;
316
317         prog = cpio_progname;
318
319         fflush(stderr);
320
321         p = (strcmp(prog,"bsdcpio") != 0) ? "(bsdcpio)" : "";
322         printf("%s%s: manipulate archive files\n", prog, p);
323
324         for (p = long_help_msg; *p != '\0'; p++) {
325                 if (*p == '%') {
326                         if (p[1] == 'p') {
327                                 fputs(prog, stdout);
328                                 p++;
329                         } else
330                                 putchar('%');
331                 } else
332                         putchar(*p);
333         }
334         version();
335 }
336
337 static void
338 version(void)
339 {
340         fprintf(stdout,"bsdcpio %s -- %s\n",
341             BSDCPIO_VERSION_STRING,
342             archive_version());
343         exit(0);
344 }
345
346 static void
347 mode_out(struct cpio *cpio)
348 {
349         unsigned long blocks;
350         struct archive_entry *entry, *spare;
351         struct line_reader *lr;
352         const char *p;
353         int r;
354
355         if (cpio->option_append)
356                 cpio_errc(1, 0, "Append mode not yet supported.");
357         cpio->archive = archive_write_new();
358         if (cpio->archive == NULL)
359                 cpio_errc(1, 0, "Failed to allocate archive object");
360         switch (cpio->compress) {
361         case 'j': case 'y':
362                 archive_write_set_compression_bzip2(cpio->archive);
363                 break;
364         case 'z':
365                 archive_write_set_compression_gzip(cpio->archive);
366                 break;
367         case 'Z':
368                 archive_write_set_compression_compress(cpio->archive);
369                 break;
370         default:
371                 archive_write_set_compression_none(cpio->archive);
372                 break;
373         }
374         r = archive_write_set_format_by_name(cpio->archive, cpio->format);
375         if (r != ARCHIVE_OK)
376                 cpio_errc(1, 0, archive_error_string(cpio->archive));
377         archive_write_set_bytes_per_block(cpio->archive, cpio->bytes_per_block);
378         cpio->linkresolver = archive_entry_linkresolver_new();
379         archive_entry_linkresolver_set_strategy(cpio->linkresolver,
380             archive_format(cpio->archive));
381
382         r = archive_write_open_file(cpio->archive, cpio->filename);
383         if (r != ARCHIVE_OK)
384                 cpio_errc(1, 0, archive_error_string(cpio->archive));
385         lr = process_lines_init("-", cpio->line_separator);
386         while ((p = process_lines_next(lr)) != NULL)
387                 file_to_archive(cpio, p);
388         process_lines_free(lr);
389
390         /*
391          * The hardlink detection may have queued up a couple of entries
392          * that can now be flushed.
393          */
394         entry = NULL;
395         archive_entry_linkify(cpio->linkresolver, &entry, &spare);
396         while (entry != NULL) {
397                 entry_to_archive(cpio, entry);
398                 archive_entry_free(entry);
399                 entry = NULL;
400                 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
401         }
402
403         r = archive_write_close(cpio->archive);
404         if (r != ARCHIVE_OK)
405                 cpio_errc(1, 0, archive_error_string(cpio->archive));
406
407         if (!cpio->quiet) {
408                 blocks = (archive_position_uncompressed(cpio->archive) + 511)
409                               / 512;
410                 fprintf(stderr, "%lu %s\n", blocks,
411                     blocks == 1 ? "block" : "blocks");
412         }
413         archive_write_finish(cpio->archive);
414 }
415
416 /*
417  * This is used by both out mode (to copy objects from disk into
418  * an archive) and pass mode (to copy objects from disk to
419  * an archive_write_disk "archive").
420  */
421 static int
422 file_to_archive(struct cpio *cpio, const char *srcpath)
423 {
424         struct stat st;
425         const char *destpath;
426         struct archive_entry *entry, *spare;
427         size_t len;
428         const char *p;
429         int lnklen;
430         int r;
431
432         /*
433          * Create an archive_entry describing the source file.
434          */
435         entry = archive_entry_new();
436         if (entry == NULL)
437                 cpio_errc(1, 0, "Couldn't allocate entry");
438         archive_entry_copy_sourcepath(entry, srcpath);
439
440         /* Get stat information. */
441         if (cpio->option_follow_links)
442                 r = stat(srcpath, &st);
443         else
444                 r = lstat(srcpath, &st);
445         if (r != 0) {
446                 cpio_warnc(errno, "Couldn't stat \"%s\"", srcpath);
447                 archive_entry_free(entry);
448                 return (0);
449         }
450
451         if (cpio->uid_override >= 0)
452                 st.st_uid = cpio->uid_override;
453         if (cpio->gid_override >= 0)
454                 st.st_gid = cpio->uid_override;
455         archive_entry_copy_stat(entry, &st);
456
457         /* If its a symlink, pull the target. */
458         if (S_ISLNK(st.st_mode)) {
459                 lnklen = readlink(srcpath, cpio->buff, cpio->buff_size);
460                 if (lnklen < 0) {
461                         cpio_warnc(errno,
462                             "%s: Couldn't read symbolic link", srcpath);
463                         archive_entry_free(entry);
464                         return (0);
465                 }
466                 cpio->buff[lnklen] = 0;
467                 archive_entry_set_symlink(entry, cpio->buff);
468         }
469
470         /*
471          * Generate a destination path for this entry.
472          * "destination path" is the name to which it will be copied in
473          * pass mode or the name that will go into the archive in
474          * output mode.
475          */
476         destpath = srcpath;
477         if (cpio->destdir) {
478                 len = strlen(cpio->destdir) + strlen(srcpath) + 8;
479                 if (len >= cpio->pass_destpath_alloc) {
480                         while (len >= cpio->pass_destpath_alloc) {
481                                 cpio->pass_destpath_alloc += 512;
482                                 cpio->pass_destpath_alloc *= 2;
483                         }
484                         free(cpio->pass_destpath);
485                         cpio->pass_destpath = malloc(cpio->pass_destpath_alloc);
486                         if (cpio->pass_destpath == NULL)
487                                 cpio_errc(1, ENOMEM,
488                                     "Can't allocate path buffer");
489                 }
490                 strcpy(cpio->pass_destpath, cpio->destdir);
491                 p = srcpath;
492                 while (p[0] == '/')
493                         ++p;
494                 strcat(cpio->pass_destpath, p);
495                 destpath = cpio->pass_destpath;
496         }
497         if (cpio->option_rename)
498                 destpath = cpio_rename(destpath);
499         if (destpath == NULL)
500                 return (0);
501         archive_entry_copy_pathname(entry, destpath);
502
503         /*
504          * If we're trying to preserve hardlinks, match them here.
505          */
506         spare = NULL;
507         if (cpio->linkresolver != NULL
508             && !S_ISDIR(st.st_mode)) {
509                 archive_entry_linkify(cpio->linkresolver, &entry, &spare);
510         }
511
512         if (entry != NULL) {
513                 r = entry_to_archive(cpio, entry);
514                 archive_entry_free(entry);
515         }
516         if (spare != NULL) {
517                 if (r == 0)
518                         r = entry_to_archive(cpio, spare);
519                 archive_entry_free(spare);
520         }
521         return (r);
522 }
523
524 static int
525 entry_to_archive(struct cpio *cpio, struct archive_entry *entry)
526 {
527         const char *destpath = archive_entry_pathname(entry);
528         const char *srcpath = archive_entry_sourcepath(entry);
529         int fd = -1;
530         ssize_t bytes_read;
531         int r;
532
533         /* Print out the destination name to the user. */
534         if (cpio->verbose)
535                 fprintf(stderr,"%s", destpath);
536
537         /*
538          * Option_link only makes sense in pass mode and for
539          * regular files.  Also note: if a link operation fails
540          * because of cross-device restrictions, we'll fall back
541          * to copy mode for that entry.
542          *
543          * TODO: Test other cpio implementations to see if they
544          * hard-link anything other than regular files here.
545          */
546         if (cpio->option_link
547             && archive_entry_filetype(entry) == AE_IFREG)
548         {
549                 struct archive_entry *t;
550                 /* Save the original entry in case we need it later. */
551                 t = archive_entry_clone(entry);
552                 if (t == NULL)
553                         cpio_errc(1, ENOMEM, "Can't create link");
554                 /* Note: link(2) doesn't create parent directories,
555                  * so we use archive_write_header() instead as a
556                  * convenience. */
557                 archive_entry_set_hardlink(t, srcpath);
558                 /* This is a straight link that carries no data. */
559                 archive_entry_set_size(t, 0);
560                 r = archive_write_header(cpio->archive, t);
561                 archive_entry_free(t);
562                 if (r != ARCHIVE_OK)
563                         cpio_warnc(archive_errno(cpio->archive),
564                             archive_error_string(cpio->archive));
565                 if (r == ARCHIVE_FATAL)
566                         exit(1);
567 #ifdef EXDEV
568                 if (r != ARCHIVE_OK && archive_errno(cpio->archive) == EXDEV) {
569                         /* Cross-device link:  Just fall through and use
570                          * the original entry to copy the file over. */
571                         cpio_warnc(0, "Copying file instead");
572                 } else
573 #endif
574                 return (0);
575         }
576
577         /*
578          * Make sure we can open the file (if necessary) before
579          * trying to write the header.
580          */
581         if (archive_entry_filetype(entry) == AE_IFREG) {
582                 if (archive_entry_size(entry) > 0) {
583                         fd = open(srcpath, O_RDONLY);
584                         if (fd < 0) {
585                                 cpio_warnc(errno,
586                                     "%s: could not open file", srcpath);
587                                 goto cleanup;
588                         }
589                 }
590         } else {
591                 archive_entry_set_size(entry, 0);
592         }
593
594         r = archive_write_header(cpio->archive, entry);
595
596         if (r != ARCHIVE_OK)
597                 cpio_warnc(archive_errno(cpio->archive),
598                     "%s: %s",
599                     destpath,
600                     archive_error_string(cpio->archive));
601
602         if (r == ARCHIVE_FATAL)
603                 exit(1);
604
605         if (r >= ARCHIVE_WARN && fd >= 0) {
606                 bytes_read = read(fd, cpio->buff, cpio->buff_size);
607                 while (bytes_read > 0) {
608                         r = archive_write_data(cpio->archive,
609                             cpio->buff, bytes_read);
610                         if (r < 0)
611                                 cpio_errc(1, archive_errno(cpio->archive),
612                                     archive_error_string(cpio->archive));
613                         if (r < bytes_read) {
614                                 cpio_warnc(0,
615                                     "Truncated write; file may have grown while being archived.");
616                         }
617                         bytes_read = read(fd, cpio->buff, cpio->buff_size);
618                 }
619         }
620
621         restore_time(cpio, entry, srcpath, fd);
622
623 cleanup:
624         if (cpio->verbose)
625                 fprintf(stderr,"\n");
626         if (fd >= 0)
627                 close(fd);
628         return (0);
629 }
630
631 static void
632 restore_time(struct cpio *cpio, struct archive_entry *entry,
633     const char *name, int fd)
634 {
635 #ifndef HAVE_UTIMES
636         static int warned = 0;
637
638         (void)cpio; /* UNUSED */
639         (void)entry; /* UNUSED */
640         (void)name; /* UNUSED */
641         (void)fd; /* UNUSED */
642
643         if (!warned)
644                 cpio_warnc(0, "Can't restore access times on this platform");
645         warned = 1;
646         return;
647 #else
648         struct timeval times[2];
649
650         if (!cpio->option_atime_restore)
651                 return;
652
653         times[1].tv_sec = archive_entry_mtime(entry);
654         times[1].tv_usec = archive_entry_mtime_nsec(entry) / 1000;
655
656         times[0].tv_sec = archive_entry_atime(entry);
657         times[0].tv_usec = archive_entry_atime_nsec(entry) / 1000;
658
659 #ifdef HAVE_FUTIMES
660         if (fd >= 0 && futimes(fd, times) == 0)
661                 return;
662 #endif
663
664 #ifdef HAVE_LUTIMES
665         if (lutimes(name, times) != 0)
666 #else
667         if (!S_ISLNK(archive_entry_mode(entry)) && utimes(name, times) != 0)
668 #endif
669                 cpio_warnc(errno, "Can't update time for %s", name);
670 #endif
671 }
672
673
674 static void
675 mode_in(struct cpio *cpio)
676 {
677         struct archive *a;
678         struct archive_entry *entry;
679         struct archive *ext;
680         const char *destpath;
681         unsigned long blocks;
682         int r;
683
684         ext = archive_write_disk_new();
685         if (ext == NULL)
686                 cpio_errc(1, 0, "Couldn't allocate restore object");
687         r = archive_write_disk_set_options(ext, cpio->extract_flags);
688         if (r != ARCHIVE_OK)
689                 cpio_errc(1, 0, archive_error_string(ext));
690         a = archive_read_new();
691         if (a == NULL)
692                 cpio_errc(1, 0, "Couldn't allocate archive object");
693         archive_read_support_compression_all(a);
694         archive_read_support_format_all(a);
695
696         if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
697                 cpio_errc(1, archive_errno(a),
698                     archive_error_string(a));
699         for (;;) {
700                 r = archive_read_next_header(a, &entry);
701                 if (r == ARCHIVE_EOF)
702                         break;
703                 if (r != ARCHIVE_OK) {
704                         cpio_errc(1, archive_errno(a),
705                             archive_error_string(a));
706                 }
707                 if (excluded(cpio, archive_entry_pathname(entry)))
708                         continue;
709                 if (cpio->option_rename) {
710                         destpath = cpio_rename(archive_entry_pathname(entry));
711                         archive_entry_set_pathname(entry, destpath);
712                 } else
713                         destpath = archive_entry_pathname(entry);
714                 if (destpath == NULL)
715                         continue;
716                 if (cpio->verbose)
717                         fprintf(stdout, "%s\n", destpath);
718                 if (cpio->uid_override >= 0)
719                         archive_entry_set_uid(entry, cpio->uid_override);
720                 if (cpio->gid_override >= 0)
721                         archive_entry_set_gid(entry, cpio->gid_override);
722                 r = archive_write_header(ext, entry);
723                 if (r != ARCHIVE_OK) {
724                         fprintf(stderr, "%s: %s\n",
725                             archive_entry_pathname(entry),
726                             archive_error_string(ext));
727                 } else if (archive_entry_size(entry) > 0) {
728                         r = copy_data(a, ext);
729                 }
730         }
731         r = archive_read_close(a);
732         if (r != ARCHIVE_OK)
733                 cpio_errc(1, 0, archive_error_string(a));
734         r = archive_write_close(ext);
735         if (r != ARCHIVE_OK)
736                 cpio_errc(1, 0, archive_error_string(ext));
737         if (!cpio->quiet) {
738                 blocks = (archive_position_uncompressed(a) + 511)
739                               / 512;
740                 fprintf(stderr, "%lu %s\n", blocks,
741                     blocks == 1 ? "block" : "blocks");
742         }
743         archive_read_finish(a);
744         archive_write_finish(ext);
745         exit(0);
746 }
747
748 static int
749 copy_data(struct archive *ar, struct archive *aw)
750 {
751         int r;
752         size_t size;
753         const void *block;
754         off_t offset;
755
756         for (;;) {
757                 r = archive_read_data_block(ar, &block, &size, &offset);
758                 if (r == ARCHIVE_EOF)
759                         return (ARCHIVE_OK);
760                 if (r != ARCHIVE_OK) {
761                         cpio_warnc(archive_errno(ar),
762                             "%s", archive_error_string(ar));
763                         return (r);
764                 }
765                 r = archive_write_data_block(aw, block, size, offset);
766                 if (r != ARCHIVE_OK) {
767                         cpio_warnc(archive_errno(aw),
768                             archive_error_string(aw));
769                         return (r);
770                 }
771         }
772 }
773
774 static void
775 mode_list(struct cpio *cpio)
776 {
777         struct archive *a;
778         struct archive_entry *entry;
779         unsigned long blocks;
780         int r;
781
782         a = archive_read_new();
783         if (a == NULL)
784                 cpio_errc(1, 0, "Couldn't allocate archive object");
785         archive_read_support_compression_all(a);
786         archive_read_support_format_all(a);
787
788         if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block))
789                 cpio_errc(1, archive_errno(a),
790                     archive_error_string(a));
791         for (;;) {
792                 r = archive_read_next_header(a, &entry);
793                 if (r == ARCHIVE_EOF)
794                         break;
795                 if (r != ARCHIVE_OK) {
796                         cpio_errc(1, archive_errno(a),
797                             archive_error_string(a));
798                 }
799                 if (excluded(cpio, archive_entry_pathname(entry)))
800                         continue;
801                 if (cpio->verbose) {
802                         /* TODO: uname/gname lookups */
803                         /* TODO: Clean this up. */
804                         fprintf(stdout,
805                             "%s%3d %8s%8s " CPIO_FILESIZE_PRINTF " %s\n",
806                             archive_entry_strmode(entry),
807                             archive_entry_nlink(entry),
808                             archive_entry_uname(entry),
809                             archive_entry_gname(entry),
810                             (CPIO_FILESIZE_TYPE)archive_entry_size(entry),
811                             archive_entry_pathname(entry));
812                 } else
813                         fprintf(stdout, "%s\n", archive_entry_pathname(entry));
814         }
815         r = archive_read_close(a);
816         if (r != ARCHIVE_OK)
817                 cpio_errc(1, 0, archive_error_string(a));
818         if (!cpio->quiet) {
819                 blocks = (archive_position_uncompressed(a) + 511)
820                               / 512;
821                 fprintf(stderr, "%lu %s\n", blocks,
822                     blocks == 1 ? "block" : "blocks");
823         }
824         archive_read_finish(a);
825         exit(0);
826 }
827
828 static void
829 mode_pass(struct cpio *cpio, const char *destdir)
830 {
831         struct line_reader *lr;
832         const char *p;
833         int r;
834
835         /* Ensure target dir has a trailing '/' to simplify path surgery. */
836         cpio->destdir = malloc(strlen(destdir) + 8);
837         strcpy(cpio->destdir, destdir);
838         if (destdir[strlen(destdir) - 1] != '/')
839                 strcat(cpio->destdir, "/");
840
841         cpio->archive = archive_write_disk_new();
842         if (cpio->archive == NULL)
843                 cpio_errc(1, 0, "Failed to allocate archive object");
844         r = archive_write_disk_set_options(cpio->archive, cpio->extract_flags);
845         if (r != ARCHIVE_OK)
846                 cpio_errc(1, 0, archive_error_string(cpio->archive));
847         cpio->linkresolver = archive_entry_linkresolver_new();
848         archive_write_disk_set_standard_lookup(cpio->archive);
849         lr = process_lines_init("-", cpio->line_separator);
850         while ((p = process_lines_next(lr)) != NULL)
851                 file_to_archive(cpio, p);
852         process_lines_free(lr);
853
854         archive_entry_linkresolver_free(cpio->linkresolver);
855         r = archive_write_close(cpio->archive);
856         if (r != ARCHIVE_OK)
857                 cpio_errc(1, 0, archive_error_string(cpio->archive));
858         archive_write_finish(cpio->archive);
859 }
860
861 /*
862  * Prompt for a new name for this entry.  Returns a pointer to the
863  * new name or NULL if the entry should not be copied.  This
864  * implements the semantics defined in POSIX.1-1996, which specifies
865  * that an input of '.' means the name should be unchanged.  GNU cpio
866  * treats '.' as a literal new name.
867  */
868 static const char *
869 cpio_rename(const char *name)
870 {
871         static char buff[1024];
872         FILE *t;
873         char *p, *ret;
874
875         t = fopen("/dev/tty", "r+");
876         if (t == NULL)
877                 return (name);
878         fprintf(t, "%s (Enter/./(new name))? ", name);
879         fflush(t);
880
881         p = fgets(buff, sizeof(buff), t);
882         fclose(t);
883         if (p == NULL)
884                 /* End-of-file is a blank line. */
885                 return (NULL);
886
887         while (*p == ' ' || *p == '\t')
888                 ++p;
889         if (*p == '\n' || *p == '\0')
890                 /* Empty line. */
891                 return (NULL);
892         if (*p == '.' && p[1] == '\n')
893                 /* Single period preserves original name. */
894                 return (name);
895         ret = p;
896         /* Trim the final newline. */
897         while (*p != '\0' && *p != '\n')
898                 ++p;
899         /* Overwrite the final \n with a null character. */
900         *p = '\0';
901         return (ret);
902 }
903
904
905 /*
906  * Read lines from file and do something with each one.  If option_null
907  * is set, lines are terminated with zero bytes; otherwise, they're
908  * terminated with newlines.
909  *
910  * This uses a self-sizing buffer to handle arbitrarily-long lines.
911  */
912 struct line_reader {
913         FILE *f;
914         char *buff, *buff_end, *line_start, *line_end, *p;
915         char *pathname;
916         size_t buff_length;
917         int separator;
918         int ret;
919 };
920
921 struct line_reader *
922 process_lines_init(const char *pathname, char separator)
923 {
924         struct line_reader *lr;
925
926         lr = calloc(1, sizeof(*lr));
927         if (lr == NULL)
928                 cpio_errc(1, ENOMEM, "Can't open %s", pathname);
929
930         lr->separator = separator;
931         lr->pathname = strdup(pathname);
932
933         if (strcmp(pathname, "-") == 0)
934                 lr->f = stdin;
935         else
936                 lr->f = fopen(pathname, "r");
937         if (lr->f == NULL)
938                 cpio_errc(1, errno, "Couldn't open %s", pathname);
939         lr->buff_length = 8192;
940         lr->buff = malloc(lr->buff_length);
941         if (lr->buff == NULL)
942                 cpio_errc(1, ENOMEM, "Can't read %s", pathname);
943         lr->line_start = lr->line_end = lr->buff_end = lr->buff;
944
945         return (lr);
946 }
947
948 const char *
949 process_lines_next(struct line_reader *lr)
950 {
951         size_t bytes_wanted, bytes_read, new_buff_size;
952         char *line_start, *p;
953
954         for (;;) {
955                 /* If there's a line in the buffer, return it immediately. */
956                 while (lr->line_end < lr->buff_end) {
957                         if (*lr->line_end == lr->separator) {
958                                 *lr->line_end = '\0';
959                                 line_start = lr->line_start;
960                                 lr->line_start = lr->line_end + 1;
961                                 lr->line_end = lr->line_start;
962                                 return (line_start);
963                         } else
964                                 lr->line_end++;
965                 }
966
967                 /* If we're at end-of-file, process the final data. */
968                 if (lr->f == NULL) {
969                         /* If there's more text, return one last line. */
970                         if (lr->line_end > lr->line_start) {
971                                 *lr->line_end = '\0';
972                                 line_start = lr->line_start;
973                                 lr->line_start = lr->line_end + 1;
974                                 lr->line_end = lr->line_start;
975                                 return (line_start);
976                         }
977                         /* Otherwise, we're done. */
978                         return (NULL);
979                 }
980
981                 /* Buffer only has part of a line. */
982                 if (lr->line_start > lr->buff) {
983                         /* Move a leftover fractional line to the beginning. */
984                         memmove(lr->buff, lr->line_start,
985                             lr->buff_end - lr->line_start);
986                         lr->buff_end -= lr->line_start - lr->buff;
987                         lr->line_end -= lr->line_start - lr->buff;
988                         lr->line_start = lr->buff;
989                 } else {
990                         /* Line is too big; enlarge the buffer. */
991                         new_buff_size = lr->buff_length * 2;
992                         if (new_buff_size <= lr->buff_length)
993                                 cpio_errc(1, ENOMEM,
994                                     "Line too long in %s", lr->pathname);
995                         lr->buff_length = new_buff_size;
996                         p = realloc(lr->buff, new_buff_size);
997                         if (p == NULL)
998                                 cpio_errc(1, ENOMEM,
999                                     "Line too long in %s", lr->pathname);
1000                         lr->buff_end = p + (lr->buff_end - lr->buff);
1001                         lr->line_end = p + (lr->line_end - lr->buff);
1002                         lr->line_start = lr->buff = p;
1003                 }
1004
1005                 /* Get some more data into the buffer. */
1006                 bytes_wanted = lr->buff + lr->buff_length - lr->buff_end;
1007                 bytes_read = fread(lr->buff_end, 1, bytes_wanted, lr->f);
1008                 lr->buff_end += bytes_read;
1009
1010                 if (ferror(lr->f))
1011                         cpio_errc(1, errno, "Can't read %s", lr->pathname);
1012                 if (feof(lr->f)) {
1013                         if (lr->f != stdin)
1014                                 fclose(lr->f);
1015                         lr->f = NULL;
1016                 }
1017         }
1018 }
1019
1020 void
1021 process_lines_free(struct line_reader *lr)
1022 {
1023         free(lr->buff);
1024         free(lr->pathname);
1025         free(lr);
1026 }