446 lines
10 KiB
C
446 lines
10 KiB
C
/* $NetBSD: rm.c,v 1.25 1999/06/30 10:18:59 is Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1990, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)rm.c 8.8 (Berkeley) 4/27/95";
|
|
#else
|
|
__RCSID("$NetBSD: rm.c,v 1.25 1999/06/30 10:18:59 is Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <locale.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <fts.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
|
|
int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok;
|
|
|
|
int check __P((char *, char *, struct stat *));
|
|
void checkdot __P((char **));
|
|
void rm_file __P((char **));
|
|
void rm_overwrite __P((char *, struct stat *));
|
|
void rm_tree __P((char **));
|
|
void usage __P((void));
|
|
int main __P((int, char *[]));
|
|
|
|
/*
|
|
* For the sake of the `-f' flag, check whether an error number indicates the
|
|
* failure of an operation due to an non-existent file, either per se (ENOENT)
|
|
* or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR).
|
|
*/
|
|
#define NONEXISTENT(x) \
|
|
((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR)
|
|
|
|
/*
|
|
* rm --
|
|
* This rm is different from historic rm's, but is expected to match
|
|
* POSIX 1003.2 behavior. The most visible difference is that -f
|
|
* has two specific effects now, ignore non-existent files and force
|
|
* file removal.
|
|
*/
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int ch, rflag;
|
|
|
|
(void)setlocale(LC_ALL, "");
|
|
|
|
Pflag = rflag = 0;
|
|
while ((ch = getopt(argc, argv, "dfiPRrW")) != -1)
|
|
switch(ch) {
|
|
case 'd':
|
|
dflag = 1;
|
|
break;
|
|
case 'f':
|
|
fflag = 1;
|
|
iflag = 0;
|
|
break;
|
|
case 'i':
|
|
fflag = 0;
|
|
iflag = 1;
|
|
break;
|
|
case 'P':
|
|
Pflag = 1;
|
|
break;
|
|
case 'R':
|
|
case 'r': /* Compatibility. */
|
|
rflag = 1;
|
|
break;
|
|
case 'W':
|
|
Wflag = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc < 1)
|
|
usage();
|
|
|
|
checkdot(argv);
|
|
|
|
if (*argv) {
|
|
stdin_ok = isatty(STDIN_FILENO);
|
|
|
|
if (rflag)
|
|
rm_tree(argv);
|
|
else
|
|
rm_file(argv);
|
|
}
|
|
|
|
exit(eval);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
rm_tree(argv)
|
|
char **argv;
|
|
{
|
|
FTS *fts;
|
|
FTSENT *p;
|
|
int needstat;
|
|
int flags;
|
|
|
|
/*
|
|
* Remove a file hierarchy. If forcing removal (-f), or interactive
|
|
* (-i) or can't ask anyway (stdin_ok), don't stat the file.
|
|
*/
|
|
needstat = !fflag && !iflag && stdin_ok;
|
|
|
|
/*
|
|
* If the -i option is specified, the user can skip on the pre-order
|
|
* visit. The fts_number field flags skipped directories.
|
|
*/
|
|
#define SKIPPED 1
|
|
|
|
flags = FTS_PHYSICAL;
|
|
if (!needstat)
|
|
flags |= FTS_NOSTAT;
|
|
if (Wflag)
|
|
flags |= FTS_WHITEOUT;
|
|
if (!(fts = fts_open(argv, flags,
|
|
(int (*) __P((const FTSENT **, const FTSENT **)))NULL)))
|
|
err(1, "%s", "");
|
|
while ((p = fts_read(fts)) != NULL) {
|
|
switch (p->fts_info) {
|
|
case FTS_DNR:
|
|
if (!fflag || p->fts_errno != ENOENT) {
|
|
warnx("%s: %s",
|
|
p->fts_path, strerror(p->fts_errno));
|
|
eval = 1;
|
|
}
|
|
continue;
|
|
case FTS_ERR:
|
|
errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
|
|
/* NOTREACHED */
|
|
case FTS_NS:
|
|
/*
|
|
* FTS_NS: assume that if can't stat the file, it
|
|
* can't be unlinked.
|
|
*/
|
|
if (!needstat)
|
|
break;
|
|
if (!fflag || !NONEXISTENT(p->fts_errno)) {
|
|
warnx("%s: %s",
|
|
p->fts_path, strerror(p->fts_errno));
|
|
eval = 1;
|
|
}
|
|
continue;
|
|
case FTS_D:
|
|
/* Pre-order: give user chance to skip. */
|
|
if (!fflag && !check(p->fts_path, p->fts_accpath,
|
|
p->fts_statp)) {
|
|
(void)fts_set(fts, p, FTS_SKIP);
|
|
p->fts_number = SKIPPED;
|
|
}
|
|
continue;
|
|
case FTS_DP:
|
|
/* Post-order: see if user skipped. */
|
|
if (p->fts_number == SKIPPED)
|
|
continue;
|
|
break;
|
|
default:
|
|
if (!fflag &&
|
|
!check(p->fts_path, p->fts_accpath, p->fts_statp))
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If we can't read or search the directory, may still be
|
|
* able to remove it. Don't print out the un{read,search}able
|
|
* message unless the remove fails.
|
|
*/
|
|
switch (p->fts_info) {
|
|
case FTS_DP:
|
|
case FTS_DNR:
|
|
if (!rmdir(p->fts_accpath) ||
|
|
(fflag && errno == ENOENT))
|
|
continue;
|
|
break;
|
|
|
|
case FTS_W:
|
|
if (!undelete(p->fts_accpath) ||
|
|
(fflag && errno == ENOENT))
|
|
continue;
|
|
break;
|
|
|
|
default:
|
|
if (Pflag)
|
|
rm_overwrite(p->fts_accpath, NULL);
|
|
if (!unlink(p->fts_accpath) ||
|
|
(fflag && NONEXISTENT(errno)))
|
|
continue;
|
|
}
|
|
warn("%s", p->fts_path);
|
|
eval = 1;
|
|
}
|
|
if (errno)
|
|
err(1, "fts_read");
|
|
}
|
|
|
|
void
|
|
rm_file(argv)
|
|
char **argv;
|
|
{
|
|
struct stat sb;
|
|
int rval;
|
|
char *f;
|
|
|
|
/*
|
|
* Remove a file. POSIX 1003.2 states that, by default, attempting
|
|
* to remove a directory is an error, so must always stat the file.
|
|
*/
|
|
while ((f = *argv++) != NULL) {
|
|
/* Assume if can't stat the file, can't unlink it. */
|
|
if (lstat(f, &sb)) {
|
|
if (Wflag) {
|
|
sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
|
|
} else {
|
|
if (!fflag || !NONEXISTENT(errno)) {
|
|
warn("%s", f);
|
|
eval = 1;
|
|
}
|
|
continue;
|
|
}
|
|
} else if (Wflag) {
|
|
warnx("%s: %s", f, strerror(EEXIST));
|
|
eval = 1;
|
|
continue;
|
|
}
|
|
|
|
if (S_ISDIR(sb.st_mode) && !dflag) {
|
|
warnx("%s: is a directory", f);
|
|
eval = 1;
|
|
continue;
|
|
}
|
|
if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
|
|
continue;
|
|
if (S_ISWHT(sb.st_mode))
|
|
rval = undelete(f);
|
|
else if (S_ISDIR(sb.st_mode))
|
|
rval = rmdir(f);
|
|
else {
|
|
if (Pflag)
|
|
rm_overwrite(f, &sb);
|
|
rval = unlink(f);
|
|
}
|
|
if (rval && (!fflag || !NONEXISTENT(errno))) {
|
|
warn("%s", f);
|
|
eval = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* rm_overwrite --
|
|
* Overwrite the file 3 times with varying bit patterns.
|
|
*
|
|
* XXX
|
|
* This is a cheap way to *really* delete files. Note that only regular
|
|
* files are deleted, directories (and therefore names) will remain.
|
|
* Also, this assumes a fixed-block file system (like FFS, or a V7 or a
|
|
* System V file system). In a logging file system, you'll have to have
|
|
* kernel support.
|
|
*/
|
|
void
|
|
rm_overwrite(file, sbp)
|
|
char *file;
|
|
struct stat *sbp;
|
|
{
|
|
struct stat sb;
|
|
off_t len;
|
|
int fd, wlen;
|
|
char buf[8 * 1024];
|
|
|
|
fd = -1;
|
|
if (sbp == NULL) {
|
|
if (lstat(file, &sb))
|
|
goto err;
|
|
sbp = &sb;
|
|
}
|
|
if (!S_ISREG(sbp->st_mode))
|
|
return;
|
|
if ((fd = open(file, O_WRONLY, 0)) == -1)
|
|
goto err;
|
|
|
|
#define PASS(byte) { \
|
|
memset(buf, byte, sizeof(buf)); \
|
|
for (len = sbp->st_size; len > 0; len -= wlen) { \
|
|
wlen = len < sizeof(buf) ? len : sizeof(buf); \
|
|
if (write(fd, buf, wlen) != wlen) \
|
|
goto err; \
|
|
} \
|
|
}
|
|
PASS(0xff);
|
|
if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
|
|
goto err;
|
|
PASS(0x00);
|
|
if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
|
|
goto err;
|
|
PASS(0xff);
|
|
if (!fsync(fd) && !close(fd))
|
|
return;
|
|
|
|
err: eval = 1;
|
|
warn("%s", file);
|
|
}
|
|
|
|
|
|
int
|
|
check(path, name, sp)
|
|
char *path, *name;
|
|
struct stat *sp;
|
|
{
|
|
int ch, first;
|
|
char modep[15];
|
|
|
|
/* Check -i first. */
|
|
if (iflag)
|
|
(void)fprintf(stderr, "remove %s? ", path);
|
|
else {
|
|
/*
|
|
* If it's not a symbolic link and it's unwritable and we're
|
|
* talking to a terminal, ask. Symbolic links are excluded
|
|
* because their permissions are meaningless. Check stdin_ok
|
|
* first because we may not have stat'ed the file.
|
|
*/
|
|
if (!stdin_ok || S_ISLNK(sp->st_mode) ||
|
|
!(access(name, W_OK) && (errno != ETXTBSY)))
|
|
return (1);
|
|
strmode(sp->st_mode, modep);
|
|
(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
|
|
modep + 1, modep[9] == ' ' ? "" : " ",
|
|
user_from_uid(sp->st_uid, 0),
|
|
group_from_gid(sp->st_gid, 0), path);
|
|
}
|
|
(void)fflush(stderr);
|
|
|
|
first = ch = getchar();
|
|
while (ch != '\n' && ch != EOF)
|
|
ch = getchar();
|
|
return (first == 'y' || first == 'Y');
|
|
}
|
|
|
|
/*
|
|
* POSIX.2 requires that if "." or ".." are specified as the basename
|
|
* portion of an operand, a diagnostic message be written to standard
|
|
* error and nothing more be done with such operands.
|
|
*
|
|
* Since POSIX.2 defines basename as the final portion of a path after
|
|
* trailing slashes have been removed, we'll remove them here.
|
|
*/
|
|
#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
|
|
void
|
|
checkdot(argv)
|
|
char **argv;
|
|
{
|
|
char *p, **save, **t;
|
|
int complained;
|
|
|
|
complained = 0;
|
|
for (t = argv; *t;) {
|
|
/* strip trailing slashes */
|
|
p = strrchr (*t, '\0');
|
|
while (--p > *t && *p == '/')
|
|
*p = '\0';
|
|
|
|
/* extract basename */
|
|
if ((p = strrchr(*t, '/')) != NULL)
|
|
++p;
|
|
else
|
|
p = *t;
|
|
|
|
if (ISDOT(p)) {
|
|
if (!complained++)
|
|
warnx("\".\" and \"..\" may not be removed");
|
|
eval = 1;
|
|
for (save = t; (t[0] = t[1]) != NULL; ++t)
|
|
continue;
|
|
t = save;
|
|
} else
|
|
++t;
|
|
}
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
(void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n");
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|