ar_io.c revision 1.39.2.1.2.1 1 /* $NetBSD: ar_io.c,v 1.39.2.1.2.1 2005/07/23 17:32:16 snj Exp $ */
2
3 /*-
4 * Copyright (c) 1992 Keith Muller.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #if HAVE_NBTOOL_CONFIG_H
37 #include "nbtool_config.h"
38 #endif
39
40 #include <sys/cdefs.h>
41 #if !defined(lint)
42 #if 0
43 static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
44 #else
45 __RCSID("$NetBSD: ar_io.c,v 1.39.2.1.2.1 2005/07/23 17:32:16 snj Exp $");
46 #endif
47 #endif /* not lint */
48
49 #include <sys/types.h>
50 #include <sys/param.h>
51 #include <sys/time.h>
52 #include <sys/stat.h>
53 #include <sys/ioctl.h>
54 #ifdef HAVE_MTIO_H
55 #include <sys/mtio.h>
56 #endif
57 #include <sys/wait.h>
58 #include <signal.h>
59 #include <string.h>
60 #include <fcntl.h>
61 #include <unistd.h>
62 #include <stdio.h>
63 #include <ctype.h>
64 #include <errno.h>
65 #include <stdlib.h>
66 #ifdef SUPPORT_RMT
67 #define __RMTLIB_PRIVATE
68 #include <rmt.h>
69 #endif /* SUPPORT_RMT */
70 #include "pax.h"
71 #include "options.h"
72 #include "extern.h"
73
74 /*
75 * Routines which deal directly with the archive I/O device/file.
76 */
77
78 #define DMOD 0666 /* default mode of created archives */
79 #define EXT_MODE O_RDONLY /* open mode for list/extract */
80 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
81 #define APP_MODE O_RDWR /* mode for append */
82 static char STDO[] = "<STDOUT>"; /* pseudo name for stdout */
83 static char STDN[] = "<STDIN>"; /* pseudo name for stdin */
84 static char NONE[] = "<NONE>"; /* pseudo name for none */
85 static int arfd = -1; /* archive file descriptor */
86 static int artyp = ISREG; /* archive type: file/FIFO/tape */
87 static int arvol = 1; /* archive volume number */
88 static int lstrval = -1; /* return value from last i/o */
89 static int io_ok; /* i/o worked on volume after resync */
90 static int did_io; /* did i/o ever occur on volume? */
91 static int done; /* set via tty termination */
92 static struct stat arsb; /* stat of archive device at open */
93 static int invld_rec; /* tape has out of spec record size */
94 static int wr_trail = 1; /* trailer was rewritten in append */
95 static int can_unlnk = 0; /* do we unlink null archives? */
96 const char *arcname; /* printable name of archive */
97 const char *gzip_program; /* name of gzip program */
98 static pid_t zpid = -1; /* pid of child process */
99 time_t starttime; /* time the run started */
100 int force_one_volume; /* 1 if we ignore volume changes */
101
102 #ifdef HAVE_MTIO_H
103 static int get_phys(void);
104 #endif
105 extern sigset_t s_mask;
106 static void ar_start_gzip(int, const char *, int);
107 static const char *timefmt(char *, size_t, off_t, time_t, const char *);
108 static const char *sizefmt(char *, size_t, off_t);
109
110 #ifdef SUPPORT_RMT
111 #ifdef SYS_NO_RESTART
112 static int rmtread_with_restart(int, void *, int);
113 static int rmtwrite_with_restart(int, void *, int);
114 #else
115 #define rmtread_with_restart(a, b, c) rmtread((a), (b), (c))
116 #define rmtwrite_with_restart(a, b, c) rmtwrite((a), (b), (c))
117 #endif
118 #endif /* SUPPORT_RMT */
119
120 /*
121 * ar_open()
122 * Opens the next archive volume. Determines the type of the device and
123 * sets up block sizes as required by the archive device and the format.
124 * Note: we may be called with name == NULL on the first open only.
125 * Return:
126 * -1 on failure, 0 otherwise
127 */
128
129 int
130 ar_open(const char *name)
131 {
132 #ifdef HAVE_MTIO_H
133 struct mtget mb;
134 #endif
135
136 if (arfd != -1)
137 (void)close(arfd);
138 arfd = -1;
139 can_unlnk = did_io = io_ok = invld_rec = 0;
140 artyp = ISREG;
141 flcnt = 0;
142
143 #ifdef SUPPORT_RMT
144 if (name && strchr(name, ':') != NULL && !forcelocal) {
145 artyp = ISRMT;
146 if ((arfd = rmtopen(name, O_RDWR, DMOD)) == -1) {
147 syswarn(0, errno, "Failed open on %s", name);
148 return -1;
149 }
150 blksz = rdblksz = 8192;
151 lstrval = 1;
152 return 0;
153 }
154 #endif /* SUPPORT_RMT */
155
156 /*
157 * open based on overall operation mode
158 */
159 switch (act) {
160 case LIST:
161 case EXTRACT:
162 if (name == NULL) {
163 arfd = STDIN_FILENO;
164 arcname = STDN;
165 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
166 syswarn(0, errno, "Failed open to read on %s", name);
167 if (arfd != -1 && gzip_program != NULL)
168 ar_start_gzip(arfd, gzip_program, 0);
169 break;
170 case ARCHIVE:
171 if (name == NULL) {
172 arfd = STDOUT_FILENO;
173 arcname = STDO;
174 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
175 syswarn(0, errno, "Failed open to write on %s", name);
176 else
177 can_unlnk = 1;
178 if (arfd != -1 && gzip_program != NULL)
179 ar_start_gzip(arfd, gzip_program, 1);
180 break;
181 case APPND:
182 if (name == NULL) {
183 arfd = STDOUT_FILENO;
184 arcname = STDO;
185 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
186 syswarn(0, errno, "Failed open to read/write on %s",
187 name);
188 break;
189 case COPY:
190 /*
191 * arfd not used in COPY mode
192 */
193 arcname = NONE;
194 lstrval = 1;
195 return(0);
196 }
197 if (arfd < 0)
198 return(-1);
199
200 if (chdname != NULL)
201 if (dochdir(chdname) == -1)
202 return(-1);
203 /*
204 * set up is based on device type
205 */
206 if (fstat(arfd, &arsb) < 0) {
207 syswarn(0, errno, "Failed stat on %s", arcname);
208 (void)close(arfd);
209 arfd = -1;
210 can_unlnk = 0;
211 return(-1);
212 }
213 if (S_ISDIR(arsb.st_mode)) {
214 tty_warn(0, "Cannot write an archive on top of a directory %s",
215 arcname);
216 (void)close(arfd);
217 arfd = -1;
218 can_unlnk = 0;
219 return(-1);
220 }
221
222 if (S_ISCHR(arsb.st_mode)) {
223 #ifdef HAVE_MTIO_H
224 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
225 #else
226 tty_warn(1, "System does not have tape support");
227 artyp = ISREG;
228 #endif
229 } else if (S_ISBLK(arsb.st_mode))
230 artyp = ISBLK;
231 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
232 artyp = ISPIPE;
233 else
234 artyp = ISREG;
235
236 /*
237 * Special handling for empty files.
238 */
239 if (artyp == ISREG && arsb.st_size == 0) {
240 switch (act) {
241 case LIST:
242 case EXTRACT:
243 return -1;
244 case APPND:
245 act = -ARCHIVE;
246 return -1;
247 case ARCHIVE:
248 break;
249 }
250 }
251
252 /*
253 * make sure we beyond any doubt that we only can unlink regular files
254 * we created
255 */
256 if (artyp != ISREG)
257 can_unlnk = 0;
258
259 /*
260 * if we are writing, we are done
261 */
262 if (act == ARCHIVE) {
263 blksz = rdblksz = wrblksz;
264 lstrval = 1;
265 return(0);
266 }
267
268 /*
269 * set default blksz on read. APPNDs writes rdblksz on the last volume
270 * On all new archive volumes, we shift to wrblksz (if the user
271 * specified one, otherwize we will continue to use rdblksz). We
272 * must set blocksize based on what kind of device the archive is
273 * stored.
274 */
275 switch(artyp) {
276 case ISTAPE:
277 /*
278 * Tape drives come in at least two flavors. Those that support
279 * variable sized records and those that have fixed sized
280 * records. They must be treated differently. For tape drives
281 * that support variable sized records, we must make large
282 * reads to make sure we get the entire record, otherwise we
283 * will just get the first part of the record (up to size we
284 * asked). Tapes with fixed sized records may or may not return
285 * multiple records in a single read. We really do not care
286 * what the physical record size is UNLESS we are going to
287 * append. (We will need the physical block size to rewrite
288 * the trailer). Only when we are appending do we go to the
289 * effort to figure out the true PHYSICAL record size.
290 */
291 blksz = rdblksz = MAXBLK;
292 break;
293 case ISPIPE:
294 case ISBLK:
295 case ISCHR:
296 /*
297 * Blocksize is not a major issue with these devices (but must
298 * be kept a multiple of 512). If the user specified a write
299 * block size, we use that to read. Under append, we must
300 * always keep blksz == rdblksz. Otherwise we go ahead and use
301 * the device optimal blocksize as (and if) returned by stat
302 * and if it is within pax specs.
303 */
304 if ((act == APPND) && wrblksz) {
305 blksz = rdblksz = wrblksz;
306 break;
307 }
308
309 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
310 ((arsb.st_blksize % BLKMULT) == 0))
311 rdblksz = arsb.st_blksize;
312 else
313 rdblksz = DEVBLK;
314 /*
315 * For performance go for large reads when we can without harm
316 */
317 if ((act == APPND) || (artyp == ISCHR))
318 blksz = rdblksz;
319 else
320 blksz = MAXBLK;
321 break;
322 case ISREG:
323 /*
324 * if the user specified wrblksz works, use it. Under appends
325 * we must always keep blksz == rdblksz
326 */
327 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
328 blksz = rdblksz = wrblksz;
329 break;
330 }
331 /*
332 * See if we can find the blocking factor from the file size
333 */
334 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
335 if ((arsb.st_size % rdblksz) == 0)
336 break;
337 /*
338 * When we cannot find a match, we may have a flawed archive.
339 */
340 if (rdblksz <= 0)
341 rdblksz = FILEBLK;
342 /*
343 * for performance go for large reads when we can
344 */
345 if (act == APPND)
346 blksz = rdblksz;
347 else
348 blksz = MAXBLK;
349 break;
350 default:
351 /*
352 * should never happen, worst case, slow...
353 */
354 blksz = rdblksz = BLKMULT;
355 break;
356 }
357 lstrval = 1;
358 return(0);
359 }
360
361 /*
362 * ar_close()
363 * closes archive device, increments volume number, and prints i/o summary
364 */
365 void
366 ar_close(void)
367 {
368 int status;
369
370 if (arfd < 0) {
371 did_io = io_ok = flcnt = 0;
372 return;
373 }
374
375
376 /*
377 * Close archive file. This may take a LONG while on tapes (we may be
378 * forced to wait for the rewind to complete) so tell the user what is
379 * going on (this avoids the user hitting control-c thinking pax is
380 * broken).
381 */
382 if (vflag && (artyp == ISTAPE)) {
383 if (vfpart)
384 (void)putc('\n', listf);
385 (void)fprintf(listf,
386 "%s: Waiting for tape drive close to complete...",
387 argv0);
388 (void)fflush(listf);
389 }
390
391 /*
392 * if nothing was written to the archive (and we created it), we remove
393 * it
394 */
395 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
396 (arsb.st_size == 0)) {
397 (void)unlink(arcname);
398 can_unlnk = 0;
399 }
400
401 /*
402 * for a quick extract/list, pax frequently exits before the child
403 * process is done
404 */
405 if ((act == LIST || act == EXTRACT) && nflag && zpid > 0)
406 kill(zpid, SIGINT);
407
408 #ifdef SUPPORT_RMT
409 if (artyp == ISRMT)
410 (void)rmtclose(arfd);
411 else
412 #endif /* SUPPORT_RMT */
413 (void)close(arfd);
414
415 /* Do not exit before child to ensure data integrity */
416 if (zpid > 0)
417 waitpid(zpid, &status, 0);
418
419 if (vflag && (artyp == ISTAPE)) {
420 (void)fputs("done.\n", listf);
421 vfpart = 0;
422 (void)fflush(listf);
423 }
424 arfd = -1;
425
426 if (!io_ok && !did_io) {
427 flcnt = 0;
428 return;
429 }
430 did_io = io_ok = 0;
431
432 /*
433 * The volume number is only increased when the last device has data
434 * and we have already determined the archive format.
435 */
436 if (frmt != NULL)
437 ++arvol;
438
439 if (!vflag) {
440 flcnt = 0;
441 return;
442 }
443
444 /*
445 * Print out a summary of I/O for this archive volume.
446 */
447 if (vfpart) {
448 (void)putc('\n', listf);
449 vfpart = 0;
450 }
451 /*
452 * If we have not determined the format yet, we just say how many bytes
453 * we have skipped over looking for a header to id. there is no way we
454 * could have written anything yet.
455 */
456 if (frmt == NULL) {
457 (void)fprintf(listf, "%s: unknown format, " OFFT_F
458 " bytes skipped.\n", argv0, rdcnt);
459 (void)fflush(listf);
460 flcnt = 0;
461 return;
462 }
463
464 if (strcmp(NM_CPIO, argv0) == 0) {
465 (void)fprintf(listf, OFFT_F " blocks\n",
466 (rdcnt ? rdcnt : wrcnt) / 5120);
467 }
468
469 ar_summary(0);
470
471 (void)fflush(listf);
472 flcnt = 0;
473 }
474
475 /*
476 * ar_drain()
477 * drain any archive format independent padding from an archive read
478 * from a socket or a pipe. This is to prevent the process on the
479 * other side of the pipe from getting a SIGPIPE (pax will stop
480 * reading an archive once a format dependent trailer is detected).
481 */
482 void
483 ar_drain(void)
484 {
485 int res;
486 char drbuf[MAXBLK];
487
488 /*
489 * we only drain from a pipe/socket. Other devices can be closed
490 * without reading up to end of file. We sure hope that pipe is closed
491 * on the other side so we will get an EOF.
492 */
493 if ((artyp != ISPIPE) || (lstrval <= 0))
494 return;
495
496 /*
497 * keep reading until pipe is drained
498 */
499 #ifdef SUPPORT_RMT
500 if (artyp == ISRMT) {
501 while ((res = rmtread_with_restart(arfd,
502 drbuf, sizeof(drbuf))) > 0)
503 continue;
504 } else {
505 #endif /* SUPPORT_RMT */
506 while ((res = read_with_restart(arfd,
507 drbuf, sizeof(drbuf))) > 0)
508 continue;
509 #ifdef SUPPORT_RMT
510 }
511 #endif /* SUPPORT_RMT */
512 lstrval = res;
513 }
514
515 /*
516 * ar_set_wr()
517 * Set up device right before switching from read to write in an append.
518 * device dependent code (if required) to do this should be added here.
519 * For all archive devices we are already positioned at the place we want
520 * to start writing when this routine is called.
521 * Return:
522 * 0 if all ready to write, -1 otherwise
523 */
524
525 int
526 ar_set_wr(void)
527 {
528 off_t cpos;
529
530 /*
531 * we must make sure the trailer is rewritten on append, ar_next()
532 * will stop us if the archive containing the trailer was not written
533 */
534 wr_trail = 0;
535
536 /*
537 * Add any device dependent code as required here
538 */
539 if (artyp != ISREG)
540 return(0);
541 /*
542 * Ok we have an archive in a regular file. If we were rewriting a
543 * file, we must get rid of all the stuff after the current offset
544 * (it was not written by pax).
545 */
546 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
547 (ftruncate(arfd, cpos) < 0)) {
548 syswarn(1, errno, "Unable to truncate archive file");
549 return(-1);
550 }
551 return(0);
552 }
553
554 /*
555 * ar_app_ok()
556 * check if the last volume in the archive allows appends. We cannot check
557 * this until we are ready to write since there is no spec that says all
558 * volumes in a single archive have to be of the same type...
559 * Return:
560 * 0 if we can append, -1 otherwise.
561 */
562
563 int
564 ar_app_ok(void)
565 {
566 if (artyp == ISPIPE) {
567 tty_warn(1,
568 "Cannot append to an archive obtained from a pipe.");
569 return(-1);
570 }
571
572 if (!invld_rec)
573 return(0);
574 tty_warn(1,
575 "Cannot append, device record size %d does not support %s spec",
576 rdblksz, argv0);
577 return(-1);
578 }
579
580 #ifdef SYS_NO_RESTART
581 /*
582 * read_with_restart()
583 * Equivalent to read() but does retry on signals.
584 * This function is not needed on 4.2BSD and later.
585 * Return:
586 * Number of bytes written. -1 indicates an error.
587 */
588
589 int
590 read_with_restart(int fd, void *buf, int bsz)
591 {
592 int r;
593
594 while (((r = read(fd, buf, bsz)) < 0) && errno == EINTR)
595 continue;
596
597 return(r);
598 }
599
600 /*
601 * rmtread_with_restart()
602 * Equivalent to rmtread() but does retry on signals.
603 * This function is not needed on 4.2BSD and later.
604 * Return:
605 * Number of bytes written. -1 indicates an error.
606 */
607 static int
608 rmtread_with_restart(int fd, void *buf, int bsz)
609 {
610 int r;
611
612 while (((r = rmtread(fd, buf, bsz)) < 0) && errno == EINTR)
613 continue;
614
615 return(r);
616 }
617 #endif
618
619 /*
620 * xread()
621 * Equivalent to read() but does retry on partial read, which may occur
622 * on signals.
623 * Return:
624 * Number of bytes read. 0 for end of file, -1 for an error.
625 */
626
627 int
628 xread(int fd, void *buf, int bsz)
629 {
630 char *b = buf;
631 int nread = 0;
632 int r;
633
634 do {
635 #ifdef SUPPORT_RMT
636 if ((r = rmtread_with_restart(fd, b, bsz)) <= 0)
637 break;
638 #else
639 if ((r = read_with_restart(fd, b, bsz)) <= 0)
640 break;
641 #endif /* SUPPORT_RMT */
642 b += r;
643 bsz -= r;
644 nread += r;
645 } while (bsz > 0);
646
647 return(nread ? nread : r);
648 }
649
650 #ifdef SYS_NO_RESTART
651 /*
652 * write_with_restart()
653 * Equivalent to write() but does retry on signals.
654 * This function is not needed on 4.2BSD and later.
655 * Return:
656 * Number of bytes written. -1 indicates an error.
657 */
658
659 int
660 write_with_restart(int fd, void *buf, int bsz)
661 {
662 int r;
663
664 while (((r = write(fd, buf, bsz)) < 0) && errno == EINTR)
665 ;
666
667 return(r);
668 }
669
670 /*
671 * rmtwrite_with_restart()
672 * Equivalent to write() but does retry on signals.
673 * This function is not needed on 4.2BSD and later.
674 * Return:
675 * Number of bytes written. -1 indicates an error.
676 */
677
678 static int
679 rmtwrite_with_restart(int fd, void *buf, int bsz)
680 {
681 int r;
682
683 while (((r = rmtwrite(fd, buf, bsz)) < 0) && errno == EINTR)
684 ;
685
686 return(r);
687 }
688 #endif
689
690 /*
691 * xwrite()
692 * Equivalent to write() but does retry on partial write, which may occur
693 * on signals.
694 * Return:
695 * Number of bytes written. -1 indicates an error.
696 */
697
698 int
699 xwrite(int fd, void *buf, int bsz)
700 {
701 char *b = buf;
702 int written = 0;
703 int r;
704
705 do {
706 #ifdef SUPPORT_RMT
707 if ((r = rmtwrite_with_restart(fd, b, bsz)) <= 0)
708 break;
709 #else
710 if ((r = write_with_restart(fd, b, bsz)) <= 0)
711 break;
712 #endif /* SUPPORT_RMT */
713 b += r;
714 bsz -= r;
715 written += r;
716 } while (bsz > 0);
717
718 return(written ? written : r);
719 }
720
721 /*
722 * ar_read()
723 * read up to a specified number of bytes from the archive into the
724 * supplied buffer. When dealing with tapes we may not always be able to
725 * read what we want.
726 * Return:
727 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
728 */
729
730 int
731 ar_read(char *buf, int cnt)
732 {
733 int res = 0;
734
735 /*
736 * if last i/o was in error, no more reads until reset or new volume
737 */
738 if (lstrval <= 0)
739 return(lstrval);
740
741 /*
742 * how we read must be based on device type
743 */
744 switch (artyp) {
745 #ifdef SUPPORT_RMT
746 case ISRMT:
747 if ((res = rmtread_with_restart(arfd, buf, cnt)) > 0) {
748 io_ok = 1;
749 return res;
750 }
751 break;
752 #endif /* SUPPORT_RMT */
753 case ISTAPE:
754 if ((res = read_with_restart(arfd, buf, cnt)) > 0) {
755 /*
756 * CAUTION: tape systems may not always return the same
757 * sized records so we leave blksz == MAXBLK. The
758 * physical record size that a tape drive supports is
759 * very hard to determine in a uniform and portable
760 * manner.
761 */
762 io_ok = 1;
763 if (res != rdblksz) {
764 /*
765 * Record size changed. If this happens on
766 * any record after the first, we probably have
767 * a tape drive which has a fixed record size
768 * (we are getting multiple records in a single
769 * read). Watch out for record blocking that
770 * violates pax spec (must be a multiple of
771 * BLKMULT).
772 */
773 rdblksz = res;
774 if (rdblksz % BLKMULT)
775 invld_rec = 1;
776 }
777 return(res);
778 }
779 break;
780 case ISREG:
781 case ISBLK:
782 case ISCHR:
783 case ISPIPE:
784 default:
785 /*
786 * Files are so easy to deal with. These other things cannot
787 * be trusted at all. So when we are dealing with character
788 * devices and pipes we just take what they have ready for us
789 * and return. Trying to do anything else with them runs the
790 * risk of failure.
791 */
792 if ((res = read_with_restart(arfd, buf, cnt)) > 0) {
793 io_ok = 1;
794 return(res);
795 }
796 break;
797 }
798
799 /*
800 * We are in trouble at this point, something is broken...
801 */
802 lstrval = res;
803 if (res < 0)
804 syswarn(1, errno, "Failed read on archive volume %d", arvol);
805 else
806 tty_warn(0, "End of archive volume %d reached", arvol);
807 return(res);
808 }
809
810 /*
811 * ar_write()
812 * Write a specified number of bytes in supplied buffer to the archive
813 * device so it appears as a single "block". Deals with errors and tries
814 * to recover when faced with short writes.
815 * Return:
816 * Number of bytes written. 0 indicates end of volume reached and with no
817 * flaws (as best that can be detected). A -1 indicates an unrecoverable
818 * error in the archive occurred.
819 */
820
821 int
822 ar_write(char *buf, int bsz)
823 {
824 int res;
825 off_t cpos;
826
827 /*
828 * do not allow pax to create a "bad" archive. Once a write fails on
829 * an archive volume prevent further writes to it.
830 */
831 if (lstrval <= 0)
832 return(lstrval);
833
834 if ((res = xwrite(arfd, buf, bsz)) == bsz) {
835 wr_trail = 1;
836 io_ok = 1;
837 return(bsz);
838 }
839 /*
840 * write broke, see what we can do with it. We try to send any partial
841 * writes that may violate pax spec to the next archive volume.
842 */
843 if (res < 0)
844 lstrval = res;
845 else
846 lstrval = 0;
847
848 switch (artyp) {
849 case ISREG:
850 if ((res > 0) && (res % BLKMULT)) {
851 /*
852 * try to fix up partial writes which are not BLKMULT
853 * in size by forcing the runt record to next archive
854 * volume
855 */
856 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
857 break;
858 cpos -= (off_t)res;
859 if (ftruncate(arfd, cpos) < 0)
860 break;
861 res = lstrval = 0;
862 break;
863 }
864 if (res >= 0)
865 break;
866 /*
867 * if file is out of space, handle it like a return of 0
868 */
869 if ((errno == ENOSPC) || (errno == EFBIG))
870 res = lstrval = 0;
871 #ifdef EDQUOT
872 if (errno == EDQUOT)
873 res = lstrval = 0;
874 #endif
875 break;
876 case ISTAPE:
877 case ISCHR:
878 case ISBLK:
879 #ifdef SUPPORT_RMT
880 case ISRMT:
881 #endif /* SUPPORT_RMT */
882 if (res >= 0)
883 break;
884 if (errno == EACCES) {
885 tty_warn(0,
886 "Write failed, archive is write protected.");
887 res = lstrval = 0;
888 return(0);
889 }
890 /*
891 * see if we reached the end of media, if so force a change to
892 * the next volume
893 */
894 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
895 res = lstrval = 0;
896 break;
897 case ISPIPE:
898 default:
899 /*
900 * we cannot fix errors to these devices
901 */
902 break;
903 }
904
905 /*
906 * Better tell the user the bad news...
907 * if this is a block aligned archive format, we may have a bad archive
908 * if the format wants the header to start at a BLKMULT boundary. While
909 * we can deal with the mis-aligned data, it violates spec and other
910 * archive readers will likely fail. if the format is not block
911 * aligned, the user may be lucky (and the archive is ok).
912 */
913 if (res >= 0) {
914 if (res > 0)
915 wr_trail = 1;
916 io_ok = 1;
917 }
918
919 /*
920 * If we were trying to rewrite the trailer and it didn't work, we
921 * must quit right away.
922 */
923 if (!wr_trail && (res <= 0)) {
924 tty_warn(1,
925 "Unable to append, trailer re-write failed. Quitting.");
926 return(res);
927 }
928
929 if (res == 0)
930 tty_warn(0, "End of archive volume %d reached", arvol);
931 else if (res < 0)
932 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
933 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
934 tty_warn(0,
935 "WARNING: partial archive write. Archive MAY BE FLAWED");
936 else
937 tty_warn(1,"WARNING: partial archive write. Archive IS FLAWED");
938 return(res);
939 }
940
941 /*
942 * ar_rdsync()
943 * Try to move past a bad spot on a flawed archive as needed to continue
944 * I/O. Clears error flags to allow I/O to continue.
945 * Return:
946 * 0 when ok to try i/o again, -1 otherwise.
947 */
948
949 int
950 ar_rdsync(void)
951 {
952 long fsbz;
953 off_t cpos;
954 off_t mpos;
955 #ifdef HAVE_MTIO_H
956 struct mtop mb;
957 #endif
958
959 /*
960 * Fail resync attempts at user request (done) or if this is going to be
961 * an update/append to a existing archive. if last i/o hit media end,
962 * we need to go to the next volume not try a resync
963 */
964 if ((done > 0) || (lstrval == 0))
965 return(-1);
966
967 if ((act == APPND) || (act == ARCHIVE)) {
968 tty_warn(1, "Cannot allow updates to an archive with flaws.");
969 return(-1);
970 }
971 if (io_ok)
972 did_io = 1;
973
974 switch(artyp) {
975 #ifdef SUPPORT_RMT
976 case ISRMT:
977 #endif /* SUPPORT_RMT */
978 case ISTAPE:
979 #ifdef HAVE_MTIO_H
980 /*
981 * if the last i/o was a successful data transfer, we assume
982 * the fault is just a bad record on the tape that we are now
983 * past. If we did not get any data since the last resync try
984 * to move the tape forward one PHYSICAL record past any
985 * damaged tape section. Some tape drives are stubborn and need
986 * to be pushed.
987 */
988 if (io_ok) {
989 io_ok = 0;
990 lstrval = 1;
991 break;
992 }
993 mb.mt_op = MTFSR;
994 mb.mt_count = 1;
995 #ifdef SUPPORT_RMT
996 if (artyp == ISRMT) {
997 if (rmtioctl(arfd, MTIOCTOP, &mb) < 0)
998 break;
999 } else {
1000 #endif /* SUPPORT_RMT */
1001 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
1002 break;
1003 #ifdef SUPPORT_RMT
1004 }
1005 #endif /* SUPPORT_RMT */
1006 lstrval = 1;
1007 #else
1008 tty_warn(1, "System does not have tape support");
1009 #endif
1010 break;
1011 case ISREG:
1012 case ISCHR:
1013 case ISBLK:
1014 /*
1015 * try to step over the bad part of the device.
1016 */
1017 io_ok = 0;
1018 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
1019 fsbz = BLKMULT;
1020 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
1021 break;
1022 mpos = fsbz - (cpos % (off_t)fsbz);
1023 if (lseek(arfd, mpos, SEEK_CUR) < 0)
1024 break;
1025 lstrval = 1;
1026 break;
1027 case ISPIPE:
1028 default:
1029 /*
1030 * cannot recover on these archive device types
1031 */
1032 io_ok = 0;
1033 break;
1034 }
1035 if (lstrval <= 0) {
1036 tty_warn(1, "Unable to recover from an archive read failure.");
1037 return(-1);
1038 }
1039 tty_warn(0, "Attempting to recover from an archive read failure.");
1040 return(0);
1041 }
1042
1043 /*
1044 * ar_fow()
1045 * Move the I/O position within the archive forward the specified number of
1046 * bytes as supported by the device. If we cannot move the requested
1047 * number of bytes, return the actual number of bytes moved in skipped.
1048 * Return:
1049 * 0 if moved the requested distance, -1 on complete failure, 1 on
1050 * partial move (the amount moved is in skipped)
1051 */
1052
1053 int
1054 ar_fow(off_t sksz, off_t *skipped)
1055 {
1056 off_t cpos;
1057 off_t mpos;
1058
1059 *skipped = 0;
1060 if (sksz <= 0)
1061 return(0);
1062
1063 /*
1064 * we cannot move forward at EOF or error
1065 */
1066 if (lstrval <= 0)
1067 return(lstrval);
1068
1069 /*
1070 * Safer to read forward on devices where it is hard to find the end of
1071 * the media without reading to it. With tapes we cannot be sure of the
1072 * number of physical blocks to skip (we do not know physical block
1073 * size at this point), so we must only read forward on tapes!
1074 */
1075 if (artyp == ISTAPE || artyp == ISPIPE
1076 #ifdef SUPPORT_RMT
1077 || artyp == ISRMT
1078 #endif /* SUPPORT_RMT */
1079 )
1080 return(0);
1081
1082 /*
1083 * figure out where we are in the archive
1084 */
1085 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
1086 /*
1087 * we can be asked to move farther than there are bytes in this
1088 * volume, if so, just go to file end and let normal buf_fill()
1089 * deal with the end of file (it will go to next volume by
1090 * itself)
1091 */
1092 mpos = cpos + sksz;
1093 if (artyp == ISREG && mpos > arsb.st_size)
1094 mpos = arsb.st_size;
1095 if ((mpos = lseek(arfd, mpos, SEEK_SET)) >= 0) {
1096 *skipped = mpos - cpos;
1097 return(0);
1098 }
1099 } else {
1100 if (artyp != ISREG)
1101 return(0); /* non-seekable device */
1102 }
1103 syswarn(1, errno, "Forward positioning operation on archive failed");
1104 lstrval = -1;
1105 return(-1);
1106 }
1107
1108 /*
1109 * ar_rev()
1110 * move the i/o position within the archive backwards the specified byte
1111 * count as supported by the device. With tapes drives we RESET rdblksz to
1112 * the PHYSICAL blocksize.
1113 * NOTE: We should only be called to move backwards so we can rewrite the
1114 * last records (the trailer) of an archive (APPEND).
1115 * Return:
1116 * 0 if moved the requested distance, -1 on complete failure
1117 */
1118
1119 int
1120 ar_rev(off_t sksz)
1121 {
1122 off_t cpos;
1123 #ifdef HAVE_MTIO_H
1124 int phyblk;
1125 struct mtop mb;
1126 #endif
1127
1128 /*
1129 * make sure we do not have try to reverse on a flawed archive
1130 */
1131 if (lstrval < 0)
1132 return(lstrval);
1133
1134 switch(artyp) {
1135 case ISPIPE:
1136 if (sksz <= 0)
1137 break;
1138 /*
1139 * cannot go backwards on these critters
1140 */
1141 tty_warn(1, "Reverse positioning on pipes is not supported.");
1142 lstrval = -1;
1143 return(-1);
1144 case ISREG:
1145 case ISBLK:
1146 case ISCHR:
1147 default:
1148 if (sksz <= 0)
1149 break;
1150
1151 /*
1152 * For things other than files, backwards movement has a very
1153 * high probability of failure as we really do not know the
1154 * true attributes of the device we are talking to (the device
1155 * may not even have the ability to lseek() in any direction).
1156 * First we figure out where we are in the archive.
1157 */
1158 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
1159 syswarn(1, errno,
1160 "Unable to obtain current archive byte offset");
1161 lstrval = -1;
1162 return(-1);
1163 }
1164
1165 /*
1166 * we may try to go backwards past the start when the archive
1167 * is only a single record. If this happens and we are on a
1168 * multi-volume archive, we need to go to the end of the
1169 * previous volume and continue our movement backwards from
1170 * there.
1171 */
1172 if ((cpos -= sksz) < (off_t)0L) {
1173 if (arvol > 1) {
1174 /*
1175 * this should never happen
1176 */
1177 tty_warn(1,
1178 "Reverse position on previous volume.");
1179 lstrval = -1;
1180 return(-1);
1181 }
1182 cpos = (off_t)0L;
1183 }
1184 if (lseek(arfd, cpos, SEEK_SET) < 0) {
1185 syswarn(1, errno, "Unable to seek archive backwards");
1186 lstrval = -1;
1187 return(-1);
1188 }
1189 break;
1190 case ISTAPE:
1191 #ifdef SUPPORT_RMT
1192 case ISRMT:
1193 #endif /* SUPPORT_RMT */
1194 #ifdef HAVE_MTIO_H
1195 /*
1196 * Calculate and move the proper number of PHYSICAL tape
1197 * blocks. If the sksz is not an even multiple of the physical
1198 * tape size, we cannot do the move (this should never happen).
1199 * (We also cannot handle trailers spread over two vols).
1200 * get_phys() also makes sure we are in front of the filemark.
1201 */
1202 if ((phyblk = get_phys()) <= 0) {
1203 lstrval = -1;
1204 return(-1);
1205 }
1206
1207 /*
1208 * make sure future tape reads only go by physical tape block
1209 * size (set rdblksz to the real size).
1210 */
1211 rdblksz = phyblk;
1212
1213 /*
1214 * if no movement is required, just return (we must be after
1215 * get_phys() so the physical blocksize is properly set)
1216 */
1217 if (sksz <= 0)
1218 break;
1219
1220 /*
1221 * ok we have to move. Make sure the tape drive can do it.
1222 */
1223 if (sksz % phyblk) {
1224 tty_warn(1,
1225 "Tape drive unable to backspace requested amount");
1226 lstrval = -1;
1227 return(-1);
1228 }
1229
1230 /*
1231 * move backwards the requested number of bytes
1232 */
1233 mb.mt_op = MTBSR;
1234 mb.mt_count = sksz/phyblk;
1235 if (
1236 #ifdef SUPPORT_RMT
1237 rmtioctl(arfd, MTIOCTOP, &mb)
1238 #else
1239 ioctl(arfd, MTIOCTOP, &mb)
1240 #endif /* SUPPORT_RMT */
1241 < 0) {
1242 syswarn(1, errno, "Unable to backspace tape %ld blocks.",
1243 (long) mb.mt_count);
1244 lstrval = -1;
1245 return(-1);
1246 }
1247 #else
1248 tty_warn(1, "System does not have tape support");
1249 #endif
1250 break;
1251 }
1252 lstrval = 1;
1253 return(0);
1254 }
1255
1256 #ifdef HAVE_MTIO_H
1257 /*
1258 * get_phys()
1259 * Determine the physical block size on a tape drive. We need the physical
1260 * block size so we know how many bytes we skip over when we move with
1261 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
1262 * return.
1263 * This is one really SLOW routine...
1264 * Return:
1265 * physical block size if ok (ok > 0), -1 otherwise
1266 */
1267
1268 static int
1269 get_phys(void)
1270 {
1271 int padsz = 0;
1272 int res;
1273 int phyblk;
1274 struct mtop mb;
1275 char scbuf[MAXBLK];
1276
1277 /*
1278 * move to the file mark, and then back up one record and read it.
1279 * this should tell us the physical record size the tape is using.
1280 */
1281 if (lstrval == 1) {
1282 /*
1283 * we know we are at file mark when we get back a 0 from
1284 * read()
1285 */
1286 #ifdef SUPPORT_RMT
1287 while ((res = rmtread_with_restart(arfd,
1288 scbuf, sizeof(scbuf))) > 0)
1289 #else
1290 while ((res = read_with_restart(arfd,
1291 scbuf, sizeof(scbuf))) > 0)
1292 #endif /* SUPPORT_RMT */
1293 padsz += res;
1294 if (res < 0) {
1295 syswarn(1, errno, "Unable to locate tape filemark.");
1296 return(-1);
1297 }
1298 }
1299
1300 /*
1301 * move backwards over the file mark so we are at the end of the
1302 * last record.
1303 */
1304 mb.mt_op = MTBSF;
1305 mb.mt_count = 1;
1306 if (
1307 #ifdef SUPPORT_RMT
1308 rmtioctl(arfd, MTIOCTOP, &mb)
1309 #else
1310 ioctl(arfd, MTIOCTOP, &mb)
1311 #endif /* SUPPORT_RMT */
1312 < 0) {
1313 syswarn(1, errno, "Unable to backspace over tape filemark.");
1314 return(-1);
1315 }
1316
1317 /*
1318 * move backwards so we are in front of the last record and read it to
1319 * get physical tape blocksize.
1320 */
1321 mb.mt_op = MTBSR;
1322 mb.mt_count = 1;
1323 if (
1324 #ifdef SUPPORT_RMT
1325 rmtioctl(arfd, MTIOCTOP, &mb)
1326 #else
1327 ioctl(arfd, MTIOCTOP, &mb)
1328 #endif /* SUPPORT_RMT */
1329 < 0) {
1330 syswarn(1, errno, "Unable to backspace over last tape block.");
1331 return(-1);
1332 }
1333 if ((phyblk =
1334 #ifdef SUPPORT_RMT
1335 rmtread_with_restart(arfd, scbuf, sizeof(scbuf))
1336 #else
1337 read_with_restart(arfd, scbuf, sizeof(scbuf))
1338 #endif /* SUPPORT_RMT */
1339 ) <= 0) {
1340 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1341 return(-1);
1342 }
1343
1344 /*
1345 * read forward to the file mark, then back up in front of the filemark
1346 * (this is a bit paranoid, but should be safe to do).
1347 */
1348 while ((res =
1349 #ifdef SUPPORT_RMT
1350 rmtread_with_restart(arfd, scbuf, sizeof(scbuf))
1351 #else
1352 read_with_restart(arfd, scbuf, sizeof(scbuf))
1353 #endif /* SUPPORT_RMT */
1354 ) > 0)
1355 ;
1356 if (res < 0) {
1357 syswarn(1, errno, "Unable to locate tape filemark.");
1358 return(-1);
1359 }
1360 mb.mt_op = MTBSF;
1361 mb.mt_count = 1;
1362 if (
1363 #ifdef SUPPORT_RMT
1364 rmtioctl(arfd, MTIOCTOP, &mb)
1365 #else
1366 ioctl(arfd, MTIOCTOP, &mb)
1367 #endif /* SUPPORT_RMT */
1368 < 0) {
1369 syswarn(1, errno, "Unable to backspace over tape filemark.");
1370 return(-1);
1371 }
1372
1373 /*
1374 * set lstrval so we know that the filemark has not been seen
1375 */
1376 lstrval = 1;
1377
1378 /*
1379 * return if there was no padding
1380 */
1381 if (padsz == 0)
1382 return(phyblk);
1383
1384 /*
1385 * make sure we can move backwards over the padding. (this should
1386 * never fail).
1387 */
1388 if (padsz % phyblk) {
1389 tty_warn(1, "Tape drive unable to backspace requested amount");
1390 return(-1);
1391 }
1392
1393 /*
1394 * move backwards over the padding so the head is where it was when
1395 * we were first called (if required).
1396 */
1397 mb.mt_op = MTBSR;
1398 mb.mt_count = padsz/phyblk;
1399 if (
1400 #ifdef SUPPORT_RMT
1401 rmtioctl(arfd, MTIOCTOP, &mb)
1402 #else
1403 ioctl(arfd, MTIOCTOP, &mb)
1404 #endif /* SUPPORT_RMT */
1405 < 0) {
1406 syswarn(1, errno,
1407 "Unable to backspace tape over %ld pad blocks",
1408 (long)mb.mt_count);
1409 return(-1);
1410 }
1411 return(phyblk);
1412 }
1413 #endif
1414
1415 /*
1416 * ar_next()
1417 * prompts the user for the next volume in this archive. For some devices
1418 * we may allow the media to be changed. Otherwise a new archive is
1419 * prompted for. By pax spec, if there is no controlling tty or an eof is
1420 * read on tty input, we must quit pax.
1421 * Return:
1422 * 0 when ready to continue, -1 when all done
1423 */
1424
1425 int
1426 ar_next(void)
1427 {
1428 char buf[PAXPATHLEN+2];
1429 static char *arcfree = NULL;
1430 sigset_t o_mask;
1431
1432 /*
1433 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1434 * things like writing EOF etc will be done) (Watch out ar_close() can
1435 * also be called via a signal handler, so we must prevent a race.
1436 */
1437 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1438 syswarn(0, errno, "Unable to set signal mask");
1439 ar_close();
1440 if (sigprocmask(SIG_SETMASK, &o_mask, (sigset_t *)NULL) < 0)
1441 syswarn(0, errno, "Unable to restore signal mask");
1442
1443 if (done || !wr_trail || force_one_volume)
1444 return(-1);
1445
1446 if (!is_gnutar)
1447 tty_prnt("\nATTENTION! %s archive volume change required.\n",
1448 argv0);
1449
1450 /*
1451 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1452 * the name), the user will be forced to type it in.
1453 */
1454 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1455 && (artyp != ISPIPE)) {
1456 if (artyp == ISTAPE
1457 #ifdef SUPPORT_RMT
1458 || artyp == ISRMT
1459 #endif /* SUPPORT_RMT */
1460 ) {
1461 tty_prnt("%s ready for archive tape volume: %d\n",
1462 arcname, arvol);
1463 tty_prnt("Load the NEXT TAPE on the tape drive");
1464 } else {
1465 tty_prnt("%s ready for archive volume: %d\n",
1466 arcname, arvol);
1467 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1468 }
1469
1470 if ((act == ARCHIVE) || (act == APPND))
1471 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1472 else
1473 tty_prnt("\n");
1474
1475 for(;;) {
1476 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1477 argv0);
1478 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1479 tty_prnt(" cannot change storage media, type \"s\"\n");
1480 tty_prnt("Is the device ready and online? > ");
1481
1482 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1483 done = 1;
1484 lstrval = -1;
1485 tty_prnt("Quitting %s!\n", argv0);
1486 vfpart = 0;
1487 return(-1);
1488 }
1489
1490 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1491 tty_prnt("%s unknown command, try again\n",buf);
1492 continue;
1493 }
1494
1495 switch (buf[0]) {
1496 case 'y':
1497 case 'Y':
1498 /*
1499 * we are to continue with the same device
1500 */
1501 if (ar_open(arcname) >= 0)
1502 return(0);
1503 tty_prnt("Cannot re-open %s, try again\n",
1504 arcname);
1505 continue;
1506 case 's':
1507 case 'S':
1508 /*
1509 * user wants to open a different device
1510 */
1511 tty_prnt("Switching to a different archive\n");
1512 break;
1513 default:
1514 tty_prnt("%s unknown command, try again\n",buf);
1515 continue;
1516 }
1517 break;
1518 }
1519 } else {
1520 if (is_gnutar) {
1521 tty_warn(1, "Unexpected EOF on archive file");
1522 return -1;
1523 }
1524 tty_prnt("Ready for archive volume: %d\n", arvol);
1525 }
1526
1527 /*
1528 * have to go to a different archive
1529 */
1530 for (;;) {
1531 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1532 tty_prnt("Archive name > ");
1533
1534 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1535 done = 1;
1536 lstrval = -1;
1537 tty_prnt("Quitting %s!\n", argv0);
1538 vfpart = 0;
1539 return(-1);
1540 }
1541 if (buf[0] == '\0') {
1542 tty_prnt("Empty file name, try again\n");
1543 continue;
1544 }
1545 if (!strcmp(buf, "..")) {
1546 tty_prnt("Illegal file name: .. try again\n");
1547 continue;
1548 }
1549 if (strlen(buf) > PAXPATHLEN) {
1550 tty_prnt("File name too long, try again\n");
1551 continue;
1552 }
1553
1554 /*
1555 * try to open new archive
1556 */
1557 if (ar_open(buf) >= 0) {
1558 if (arcfree) {
1559 (void)free(arcfree);
1560 arcfree = NULL;
1561 }
1562 if ((arcfree = strdup(buf)) == NULL) {
1563 done = 1;
1564 lstrval = -1;
1565 tty_warn(0, "Cannot save archive name.");
1566 return(-1);
1567 }
1568 arcname = arcfree;
1569 break;
1570 }
1571 tty_prnt("Cannot open %s, try again\n", buf);
1572 continue;
1573 }
1574 return(0);
1575 }
1576
1577 /*
1578 * ar_start_gzip()
1579 * starts the compression/decompression process as a child, using magic
1580 * to keep the fd the same in the calling function (parent). possible
1581 * programs are GZIP_CMD, BZIP2_CMD, and COMPRESS_CMD.
1582 */
1583 void
1584 ar_start_gzip(int fd, const char *gzp, int wr)
1585 {
1586 int fds[2];
1587 const char *gzip_flags;
1588
1589 if (pipe(fds) < 0)
1590 err(1, "could not pipe");
1591 zpid = fork();
1592 if (zpid < 0)
1593 err(1, "could not fork");
1594
1595 /* parent */
1596 if (zpid) {
1597 if (wr)
1598 dup2(fds[1], fd);
1599 else
1600 dup2(fds[0], fd);
1601 close(fds[0]);
1602 close(fds[1]);
1603 } else {
1604 if (wr) {
1605 dup2(fds[0], STDIN_FILENO);
1606 dup2(fd, STDOUT_FILENO);
1607 gzip_flags = "-c";
1608 } else {
1609 dup2(fds[1], STDOUT_FILENO);
1610 dup2(fd, STDIN_FILENO);
1611 gzip_flags = "-dc";
1612 }
1613 close(fds[0]);
1614 close(fds[1]);
1615 if (execlp(gzp, gzp, gzip_flags, NULL) < 0)
1616 err(1, "could not exec");
1617 /* NOTREACHED */
1618 }
1619 }
1620
1621 static const char *
1622 timefmt(buf, size, sz, tm, unitstr)
1623 char *buf;
1624 size_t size;
1625 off_t sz;
1626 time_t tm;
1627 const char *unitstr;
1628 {
1629 (void)snprintf(buf, size, "%lu secs (" OFFT_F " %s/sec)",
1630 (unsigned long)tm, (OFFT_T)(sz / tm), unitstr);
1631 return buf;
1632 }
1633
1634 static const char *
1635 sizefmt(buf, size, sz)
1636 char *buf;
1637 size_t size;
1638 off_t sz;
1639 {
1640 (void)snprintf(buf, size, OFFT_F " bytes", (OFFT_T)sz);
1641 return buf;
1642 }
1643
1644 void
1645 ar_summary(int n)
1646 {
1647 time_t secs;
1648 int len;
1649 char buf[MAXPATHLEN];
1650 char tbuf[MAXPATHLEN/4];
1651 char s1buf[MAXPATHLEN/8];
1652 char s2buf[MAXPATHLEN/8];
1653 FILE *outf;
1654
1655 if (act == LIST)
1656 outf = stdout;
1657 else
1658 outf = stderr;
1659
1660 /*
1661 * If we are called from a signal (n != 0), use snprintf(3) so that we
1662 * don't reenter stdio(3).
1663 */
1664 (void)time(&secs);
1665 if ((secs -= starttime) == 0)
1666 secs = 1;
1667
1668 /*
1669 * If we have not determined the format yet, we just say how many bytes
1670 * we have skipped over looking for a header to id. there is no way we
1671 * could have written anything yet.
1672 */
1673 if (frmt == NULL && act != COPY) {
1674 len = snprintf(buf, sizeof(buf),
1675 "unknown format, %s skipped in %s\n",
1676 sizefmt(s1buf, sizeof(s1buf), rdcnt),
1677 timefmt(tbuf, sizeof(tbuf), rdcnt, secs, "bytes"));
1678 if (n == 0)
1679 (void)fprintf(outf, "%s: %s", argv0, buf);
1680 else
1681 (void)write(STDERR_FILENO, buf, len);
1682 return;
1683 }
1684
1685
1686 if (n != 0) {
1687 len = snprintf(buf, sizeof(buf), "Working on `%s' (%s)\n",
1688 archd.name, sizefmt(s1buf, sizeof(s1buf), archd.sb.st_size));
1689 (void)write(STDERR_FILENO, buf, len);
1690 }
1691
1692
1693 if (act == COPY) {
1694 len = snprintf(buf, sizeof(buf),
1695 "%lu files in %s\n",
1696 (unsigned long)flcnt,
1697 timefmt(tbuf, sizeof(tbuf), flcnt, secs, "files"));
1698 } else {
1699 len = snprintf(buf, sizeof(buf),
1700 "%s vol %d, %lu files, %s read, %s written in %s\n",
1701 frmt->name, arvol-1, (unsigned long)flcnt,
1702 sizefmt(s1buf, sizeof(s1buf), rdcnt),
1703 sizefmt(s2buf, sizeof(s2buf), wrcnt),
1704 timefmt(tbuf, sizeof(tbuf), rdcnt + wrcnt, secs, "bytes"));
1705 }
1706 if (n == 0)
1707 (void)fprintf(outf, "%s: %s", argv0, buf);
1708 else
1709 (void)write(STDERR_FILENO, buf, strlen(buf));
1710 }
1711
1712 /*
1713 * ar_dochdir(name)
1714 * change directory to name, and remember where we came from and
1715 * where we change to (for ar_open).
1716 *
1717 * Maybe we could try to be smart and only do the actual chdir
1718 * when necessary to write a file read from the archive, but this
1719 * is not easy to get right given the pax code structure.
1720 *
1721 * Be sure to not leak descriptors!
1722 *
1723 * We are called N * M times when extracting, and N times when
1724 * writing archives, where
1725 * N: number of -C options
1726 * M: number of files in archive
1727 *
1728 * Returns 0 if all went well, else -1.
1729 */
1730
1731 int
1732 ar_dochdir(const char *name)
1733 {
1734 /* First fdochdir() back... */
1735 if (fdochdir(cwdfd) == -1)
1736 return -1;
1737 if (dochdir(name) == -1)
1738 return -1;
1739 return 0;
1740 }
1741