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a8c32ea5a1
Submitted by: Added the FTS_NOCHDIR flag to the fts-open call. This is needed, so that the fts don't change the current directory for rm and subsequent calls to rmdir with relative pathnames don't fail. Pulled over the bugfix in 1.1.5.
379 lines
8.8 KiB
C
379 lines
8.8 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int dflag, eval, fflag, iflag, Pflag, stdin_ok;
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int check __P((char *, char *, struct stat *));
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void checkdot __P((char **));
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void rm_file __P((char **));
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void rm_overwrite __P((char *, struct stat *));
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void rm_tree __P((char **));
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void usage __P((void));
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/*
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* rm --
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* This rm is different from historic rm's, but is expected to match
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* POSIX 1003.2 behavior. The most visible difference is that -f
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* has two specific effects now, ignore non-existent files and force
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* file removal.
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*/
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ch, rflag;
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Pflag = rflag = 0;
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while ((ch = getopt(argc, argv, "dfiPRr")) != EOF)
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switch(ch) {
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case 'd':
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dflag = 1;
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break;
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'i':
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fflag = 0;
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iflag = 1;
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break;
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case 'P':
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Pflag = 1;
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break;
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case 'R':
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case 'r': /* Compatibility. */
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rflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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checkdot(argv);
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if (!*argv)
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exit (eval);
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stdin_ok = isatty(STDIN_FILENO);
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if (rflag)
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rm_tree(argv);
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else
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rm_file(argv);
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exit (eval);
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}
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void
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rm_tree(argv)
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char **argv;
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{
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FTS *fts;
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FTSENT *p;
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int needstat;
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/*
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* Remove a file hierarchy. If forcing removal (-f), or interactive
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* (-i) or can't ask anyway (stdin_ok), don't stat the file.
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*/
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needstat = !fflag && !iflag && stdin_ok;
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/*
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* If the -i option is specified, the user can skip on the pre-order
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* visit. The fts_number field flags skipped directories.
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*/
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#define SKIPPED 1
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if (!(fts = fts_open(argv,
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needstat ? FTS_PHYSICAL|FTS_NOCHDIR :
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FTS_PHYSICAL|FTS_NOSTAT|FTS_NOCHDIR, (int (*)())NULL)))
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err(1, NULL);
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while ((p = fts_read(fts)) != NULL) {
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switch (p->fts_info) {
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case FTS_DNR:
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if (!fflag || p->fts_errno != ENOENT) {
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warnx("%s: %s",
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p->fts_path, strerror(p->fts_errno));
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eval = 1;
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}
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continue;
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case FTS_ERR:
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errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
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case FTS_NS:
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/*
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* FTS_NS: assume that if can't stat the file, it
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* can't be unlinked.
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*/
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if (!needstat)
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break;
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if (!fflag || p->fts_errno != ENOENT) {
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warnx("%s: %s",
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p->fts_path, strerror(p->fts_errno));
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eval = 1;
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}
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continue;
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case FTS_D:
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/* Pre-order: give user chance to skip. */
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if (iflag && !check(p->fts_path, p->fts_accpath,
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p->fts_statp)) {
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(void)fts_set(fts, p, FTS_SKIP);
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p->fts_number = SKIPPED;
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}
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continue;
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case FTS_DP:
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/* Post-order: see if user skipped. */
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if (p->fts_number == SKIPPED)
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continue;
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break;
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}
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if (!fflag &&
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!check(p->fts_path, p->fts_accpath, p->fts_statp))
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continue;
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/*
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* If we can't read or search the directory, may still be
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* able to remove it. Don't print out the un{read,search}able
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* message unless the remove fails.
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*/
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if (p->fts_info == FTS_DP || p->fts_info == FTS_DNR) {
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if (!rmdir(p->fts_accpath))
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continue;
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if (errno == ENOENT) {
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if (fflag)
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continue;
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} else if (p->fts_info != FTS_DP)
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warnx("%s: unable to read", p->fts_path);
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} else {
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if (Pflag)
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rm_overwrite(p->fts_accpath, NULL);
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if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
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continue;
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}
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warn("%s", p->fts_path);
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eval = 1;
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}
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if (errno)
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err(1, "fts_read");
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}
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void
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rm_file(argv)
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char **argv;
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{
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struct stat sb;
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int df, rval;
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char *f;
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df = dflag;
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/*
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* Remove a file. POSIX 1003.2 states that, by default, attempting
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* to remove a directory is an error, so must always stat the file.
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*/
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while ((f = *argv++) != NULL) {
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/* Assume if can't stat the file, can't unlink it. */
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if (lstat(f, &sb)) {
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if (!fflag || errno != ENOENT) {
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warn("%s", f);
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eval = 1;
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}
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continue;
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}
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if (S_ISDIR(sb.st_mode) && !df) {
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warnx("%s: is a directory", f);
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eval = 1;
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continue;
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}
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if (!fflag && !check(f, f, &sb))
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continue;
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if (S_ISDIR(sb.st_mode))
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rval = rmdir(f);
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else {
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if (Pflag)
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rm_overwrite(f, &sb);
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rval = unlink(f);
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}
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if (rval && (!fflag || errno != ENOENT)) {
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warn("%s", f);
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eval = 1;
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}
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}
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}
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/*
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* rm_overwrite --
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* Overwrite the file 3 times with varying bit patterns.
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*
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* XXX
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* This is a cheap way to *really* delete files. Note that only regular
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* files are deleted, directories (and therefore names) will remain.
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* Also, this assumes a fixed-block file system (like FFS, or a V7 or a
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* System V file system). In a logging file system, you'll have to have
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* kernel support.
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*/
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void
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rm_overwrite(file, sbp)
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char *file;
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struct stat *sbp;
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{
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struct stat sb;
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off_t len;
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int fd, wlen;
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char buf[8 * 1024];
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fd = -1;
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if (sbp == NULL) {
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if (lstat(file, &sb))
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goto err;
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sbp = &sb;
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}
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if (!S_ISREG(sbp->st_mode))
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return;
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if ((fd = open(file, O_WRONLY, 0)) == -1)
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goto err;
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#define PASS(byte) { \
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memset(buf, byte, sizeof(buf)); \
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for (len = sbp->st_size; len > 0; len -= wlen) { \
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wlen = len < sizeof(buf) ? len : sizeof(buf); \
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if (write(fd, buf, wlen) != wlen) \
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goto err; \
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} \
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}
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PASS(0xff);
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if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
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goto err;
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PASS(0x00);
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if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
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goto err;
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PASS(0xff);
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if (!fsync(fd) && !close(fd))
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return;
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err: eval = 1;
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warn("%s", file);
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}
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int
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check(path, name, sp)
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char *path, *name;
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struct stat *sp;
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{
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int ch, first;
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char modep[15];
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/* Check -i first. */
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if (iflag)
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(void)fprintf(stderr, "remove %s? ", path);
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else {
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/*
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* If it's not a symbolic link and it's unwritable and we're
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* talking to a terminal, ask. Symbolic links are excluded
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* because their permissions are meaningless. Check stdin_ok
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* first because we may not have stat'ed the file.
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*/
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if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK))
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return (1);
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strmode(sp->st_mode, modep);
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(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
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modep + 1, modep[9] == ' ' ? "" : " ",
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user_from_uid(sp->st_uid, 0),
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group_from_gid(sp->st_gid, 0), path);
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}
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(void)fflush(stderr);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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return (first == 'y');
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}
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#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2]))
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void
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checkdot(argv)
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char **argv;
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{
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char *p, **save, **t;
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int complained;
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complained = 0;
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for (t = argv; *t;) {
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if ((p = strrchr(*t, '/')) != NULL)
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++p;
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else
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p = *t;
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if (ISDOT(p)) {
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if (!complained++)
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warnx("\".\" and \"..\" may not be removed");
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eval = 1;
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for (save = t; (t[0] = t[1]) != NULL; ++t);
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t = save;
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} else
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++t;
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}
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
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exit(1);
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}
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