source: trunk/src/gmake/kmkbuiltin/rm.c@ 631

Last change on this file since 631 was 557, checked in by bird, 19 years ago

Initial Mac OS X / Darwin bootstrapping.
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File size: 14.2 KB
Line 
1/*-
2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. 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 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static const char copyright[] =
33"@(#) Copyright (c) 1990, 1993, 1994\n\
34 The Regents of the University of California. All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
39#endif /* not lint */
40#include <sys/cdefs.h>
41//__FBSDID("$FreeBSD: src/bin/rm/rm.c,v 1.47 2004/04/06 20:06:50 markm Exp $");
42#endif
43#ifdef __EMX__
44# define DO_RMTREE
45#endif
46
47#include <sys/stat.h>
48#ifndef _MSC_VER
49#include <sys/param.h>
50#include <sys/mount.h>
51#endif
52
53#include "err.h"
54#include <errno.h>
55#include <fcntl.h>
56#ifdef DO_RMTREE
57#include <fts.h>
58#endif
59#ifndef _MSC_VER
60#include <grp.h>
61#include <pwd.h>
62#endif
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#ifndef _MSC_VER
67#include <sysexits.h>
68#include <unistd.h>
69#else
70#include "mscfakes.h"
71#endif
72
73#ifdef __EMX__
74#undef S_IFWHT
75#undef S_ISWHT
76#endif
77#ifndef S_IFWHT
78#define S_IFWHT 0
79#define S_ISWHT(s) 0
80#define undelete(s) (-1)
81#endif
82
83#if !defined(__FreeBSD__) && !defined(__APPLE__)
84extern void strmode(mode_t mode, char *p);
85#endif
86
87static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
88static uid_t uid;
89
90static char *argv0;
91
92static int check(char *, char *, struct stat *);
93static void checkdot(char **);
94static void rm_file(char **);
95static int rm_overwrite(char *, struct stat *);
96#ifdef DO_RMTREE
97static void rm_tree(char **);
98#endif
99static int usage(void);
100
101/*
102 * rm --
103 * This rm is different from historic rm's, but is expected to match
104 * POSIX 1003.2 behavior. The most visible difference is that -f
105 * has two specific effects now, ignore non-existent files and force
106 * file removal.
107 */
108int
109kmk_builtin_rm(int argc, char *argv[])
110{
111 int ch, rflag;
112 char *p;
113
114 /* reinitialize globals */
115 argv0 = argv[0];
116 dflag = eval = fflag = iflag = Pflag = vflag = Wflag = stdin_ok = 0;
117 uid = 0;
118
119 /* kmk: reset getopt and set program name. */
120 g_progname = argv[0];
121 opterr = 1;
122 optarg = NULL;
123 optopt = 0;
124#if defined(__FreeBSD__) || defined(__EMX__) || defined(__APPLE__)
125 optreset = 1;
126 optind = 1;
127#else
128 optind = 0; /* init */
129#endif
130
131#if 0 /* kmk: we don't need this */
132 /*
133 * Test for the special case where the utility is called as
134 * "unlink", for which the functionality provided is greatly
135 * simplified.
136 */
137 if ((p = rindex(argv[0], '/')) == NULL)
138 p = argv[0];
139 else
140 ++p;
141 if (strcmp(p, "unlink") == 0) {
142 while (getopt(argc, argv, "") != -1)
143 return usage();
144 argc -= optind;
145 argv += optind;
146 if (argc != 1)
147 return usage();
148 rm_file(&argv[0]);
149 return eval;
150 }
151#else
152 (void)p;
153#endif
154 Pflag = rflag = 0;
155 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
156 switch(ch) {
157 case 'd':
158 dflag = 1;
159 break;
160 case 'f':
161 fflag = 1;
162 iflag = 0;
163 break;
164 case 'i':
165 fflag = 0;
166 iflag = 1;
167 break;
168 case 'P':
169 Pflag = 1;
170 break;
171 case 'R':
172 case 'r': /* Compatibility. */
173#ifdef DO_RMTREE
174 rflag = 1;
175 break;
176#else
177 errno = EINVAL;
178 return err(1, "Recursion is not supported!");
179#endif
180 case 'v':
181 vflag = 1;
182 break;
183#ifdef FTS_WHITEOUT
184 case 'W':
185 Wflag = 1;
186 break;
187#endif
188 default:
189 return usage();
190 }
191 argc -= optind;
192 argv += optind;
193
194 if (argc < 1) {
195 if (fflag)
196 return (0);
197 return usage();
198 }
199
200 checkdot(argv);
201 uid = geteuid();
202
203 if (*argv) {
204 stdin_ok = isatty(STDIN_FILENO);
205#ifdef DO_RMTREE
206 if (rflag)
207 rm_tree(argv);
208 else
209#endif
210 rm_file(argv);
211 }
212
213 return eval;
214}
215
216#ifdef DO_RMTREE
217static void
218rm_tree(char **argv)
219{
220 FTS *fts;
221 FTSENT *p;
222 int needstat;
223 int flags;
224 int rval;
225
226 /*
227 * Remove a file hierarchy. If forcing removal (-f), or interactive
228 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
229 */
230 needstat = !uid || (!fflag && !iflag && stdin_ok);
231
232 /*
233 * If the -i option is specified, the user can skip on the pre-order
234 * visit. The fts_number field flags skipped directories.
235 */
236#define SKIPPED 1
237
238 flags = FTS_PHYSICAL;
239 if (!needstat)
240 flags |= FTS_NOSTAT;
241#ifdef FTS_WHITEOUT
242 if (Wflag)
243 flags |= FTS_WHITEOUT;
244#endif
245 if (!(fts = fts_open(argv, flags, NULL))) {
246 eval = err(1, "fts_open");
247 return;
248 }
249 while ((p = fts_read(fts)) != NULL) {
250 switch (p->fts_info) {
251 case FTS_DNR:
252 if (!fflag || p->fts_errno != ENOENT) {
253 fprintf(stderr, "%s: %s: %s\n",
254 argv0, p->fts_path, strerror(p->fts_errno));
255 eval = 1;
256 }
257 continue;
258 case FTS_ERR:
259 eval = errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
260 return;
261 case FTS_NS:
262 /*
263 * Assume that since fts_read() couldn't stat the
264 * file, it can't be unlinked.
265 */
266 if (!needstat)
267 break;
268 if (!fflag || p->fts_errno != ENOENT) {
269 fprintf(stderr, "%s: %s: %s\n",
270 argv0, p->fts_path, strerror(p->fts_errno));
271 eval = 1;
272 }
273 continue;
274 case FTS_D:
275 /* Pre-order: give user chance to skip. */
276 if (!fflag && !check(p->fts_path, p->fts_accpath,
277 p->fts_statp)) {
278 (void)fts_set(fts, p, FTS_SKIP);
279 p->fts_number = SKIPPED;
280 }
281#ifdef UF_APPEND
282 else if (!uid &&
283 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
284 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
285 chflags(p->fts_accpath,
286 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
287 goto err;
288#endif
289 continue;
290 case FTS_DP:
291 /* Post-order: see if user skipped. */
292 if (p->fts_number == SKIPPED)
293 continue;
294 break;
295 default:
296 if (!fflag &&
297 !check(p->fts_path, p->fts_accpath, p->fts_statp))
298 continue;
299 }
300
301 rval = 0;
302#ifdef UF_APPEND
303 if (!uid &&
304 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
305 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
306 rval = chflags(p->fts_accpath,
307 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
308#endif
309 if (rval == 0) {
310 /*
311 * If we can't read or search the directory, may still be
312 * able to remove it. Don't print out the un{read,search}able
313 * message unless the remove fails.
314 */
315 switch (p->fts_info) {
316 case FTS_DP:
317 case FTS_DNR:
318 rval = rmdir(p->fts_accpath);
319 if (rval == 0 || (fflag && errno == ENOENT)) {
320 if (rval == 0 && vflag)
321 (void)printf("%s\n",
322 p->fts_path);
323 continue;
324 }
325 break;
326
327#ifdef FTS_W
328 case FTS_W:
329 rval = undelete(p->fts_accpath);
330 if (rval == 0 && (fflag && errno == ENOENT)) {
331 if (vflag)
332 (void)printf("%s\n",
333 p->fts_path);
334 continue;
335 }
336 break;
337#endif
338
339 case FTS_NS:
340 /*
341 * Assume that since fts_read() couldn't stat
342 * the file, it can't be unlinked.
343 */
344 if (fflag)
345 continue;
346 /* FALLTHROUGH */
347 default:
348 if (Pflag)
349 if (!rm_overwrite(p->fts_accpath, NULL))
350 continue;
351 rval = unlink(p->fts_accpath);
352#ifdef _MSC_VER
353 if (rval != 0) {
354 chmod(p->fts_accpath, 0777);
355 rval = unlink(p->fts_accpath);
356 }
357#endif
358
359 if (rval == 0 || (fflag && errno == ENOENT)) {
360 if (rval == 0 && vflag)
361 (void)printf("%s\n",
362 p->fts_path);
363 continue;
364 }
365 }
366 }
367err:
368 fprintf(stderr, "%s: %s: %s\n", argv0, p->fts_path, strerror(errno));
369 eval = 1;
370 }
371 if (errno) {
372 fprintf(stderr, "%s: fts_read: %s\n", argv0, strerror(errno));
373 eval = 1;
374 }
375}
376#endif /* DO_RMTREE */
377
378static void
379rm_file(char **argv)
380{
381 struct stat sb;
382 int rval;
383 char *f;
384
385 /*
386 * Remove a file. POSIX 1003.2 states that, by default, attempting
387 * to remove a directory is an error, so must always stat the file.
388 */
389 while ((f = *argv++) != NULL) {
390 /* Assume if can't stat the file, can't unlink it. */
391 if (lstat(f, &sb)) {
392#ifdef FTS_WHITEOUT
393 if (Wflag) {
394 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
395 } else {
396#else
397 {
398#endif
399 if (!fflag || errno != ENOENT) {
400 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(errno));
401 eval = 1;
402 }
403 continue;
404 }
405#ifdef FTS_WHITEOUT
406 } else if (Wflag) {
407 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(EEXIST));
408 eval = 1;
409 continue;
410#endif
411 }
412
413 if (S_ISDIR(sb.st_mode) && !dflag) {
414 fprintf(stderr, "%s: %s: is a directory\n", argv0, f);
415 eval = 1;
416 continue;
417 }
418 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
419 continue;
420 rval = 0;
421#ifdef UF_APPEND
422 if (!uid &&
423 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
424 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
425 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
426#endif
427 if (rval == 0) {
428 if (S_ISWHT(sb.st_mode))
429 rval = undelete(f);
430 else if (S_ISDIR(sb.st_mode))
431 rval = rmdir(f);
432 else {
433 if (Pflag)
434 if (!rm_overwrite(f, &sb))
435 continue;
436 rval = unlink(f);
437#ifdef _MSC_VER
438 if (rval != 0) {
439 chmod(f, 0777);
440 rval = unlink(f);
441 }
442#endif
443 }
444 }
445 if (rval && (!fflag || errno != ENOENT)) {
446 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(errno));
447 eval = 1;
448 }
449 if (vflag && rval == 0)
450 (void)printf("%s\n", f);
451 }
452}
453
454/*
455 * rm_overwrite --
456 * Overwrite the file 3 times with varying bit patterns.
457 *
458 * XXX
459 * This is a cheap way to *really* delete files. Note that only regular
460 * files are deleted, directories (and therefore names) will remain.
461 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
462 * System V file system). In a logging file system, you'll have to have
463 * kernel support.
464 */
465static int
466rm_overwrite(char *file, struct stat *sbp)
467{
468 struct stat sb;
469#ifdef HAVE_FSTATFS
470 struct statfs fsb;
471#endif
472 off_t len;
473 int bsize, fd, wlen;
474 char *buf = NULL;
475
476 fd = -1;
477 if (sbp == NULL) {
478 if (lstat(file, &sb))
479 goto err;
480 sbp = &sb;
481 }
482 if (!S_ISREG(sbp->st_mode))
483 return (1);
484 if ((fd = open(file, O_WRONLY, 0)) == -1)
485 goto err;
486#ifdef HAVE_FSTATFS
487 if (fstatfs(fd, &fsb) == -1)
488 goto err;
489 bsize = MAX(fsb.f_iosize, 1024);
490#elif defined(HAVE_ST_BLKSIZE)
491 bsize = MAX(sb.st_blksize, 1024);
492#else
493 bsize = 1024;
494#endif
495 if ((buf = malloc(bsize)) == NULL)
496 exit(err(1, "%s: malloc", file));
497
498#define PASS(byte) { \
499 memset(buf, byte, bsize); \
500 for (len = sbp->st_size; len > 0; len -= wlen) { \
501 wlen = len < bsize ? len : bsize; \
502 if (write(fd, buf, wlen) != wlen) \
503 goto err; \
504 } \
505}
506 PASS(0xff);
507 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
508 goto err;
509 PASS(0x00);
510 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
511 goto err;
512 PASS(0xff);
513 if (!fsync(fd) && !close(fd)) {
514 free(buf);
515 return (1);
516 }
517
518err: eval = 1;
519 if (buf)
520 free(buf);
521 if (fd != -1)
522 close(fd);
523 fprintf(stderr, "%s: %s: %s\n", argv0, file, strerror(errno));
524 return (0);
525}
526
527
528static int
529check(char *path, char *name, struct stat *sp)
530{
531 int ch, first;
532 char modep[15], *flagsp;
533
534 /* Check -i first. */
535 if (iflag)
536 (void)fprintf(stderr, "remove %s? ", path);
537 else {
538 /*
539 * If it's not a symbolic link and it's unwritable and we're
540 * talking to a terminal, ask. Symbolic links are excluded
541 * because their permissions are meaningless. Check stdin_ok
542 * first because we may not have stat'ed the file.
543 * Also skip this check if the -P option was specified because
544 * we will not be able to overwrite file contents and will
545 * barf later.
546 */
547 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
548 (!access(name, W_OK) &&
549#ifdef SF_APPEND
550 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
551 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))
552#else
553 1)
554#endif
555 )
556 return (1);
557 strmode(sp->st_mode, modep);
558#ifdef SF_APPEND
559 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
560 exit(err(1, "fflagstostr"));
561 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
562 modep + 1, modep[9] == ' ' ? "" : " ",
563 user_from_uid(sp->st_uid, 0),
564 group_from_gid(sp->st_gid, 0),
565 *flagsp ? flagsp : "", *flagsp ? " " : "",
566 path);
567 free(flagsp);
568#else
569 (void)flagsp;
570 (void)fprintf(stderr, "override %s%s %d/%d for %s? ",
571 modep + 1, modep[9] == ' ' ? "" : " ",
572 sp->st_uid, sp->st_gid, path);
573#endif
574 }
575 (void)fflush(stderr);
576
577 first = ch = getchar();
578 while (ch != '\n' && ch != EOF)
579 ch = getchar();
580 return (first == 'y' || first == 'Y');
581}
582
583#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
584static void
585checkdot(char **argv)
586{
587 char *p, **save, **t;
588 int complained;
589
590 complained = 0;
591 for (t = argv; *t;) {
592 if ((p = strrchr(*t, '/')) != NULL)
593 ++p;
594 else
595 p = *t;
596 if (ISDOT(p)) {
597 if (!complained++)
598 fprintf(stderr, "%s: \".\" and \"..\" may not be removed\n", argv0);
599 eval = 1;
600 for (save = t; (t[0] = t[1]) != NULL; ++t)
601 continue;
602 t = save;
603 } else
604 ++t;
605 }
606}
607
608static int
609usage(void)
610{
611
612 (void)fprintf(stderr, "%s\n%s\n",
613 "usage: rm [-f | -i] [-dPRrvW] file ...\n",
614 " unlink file");
615 return EX_USAGE;
616}
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