476 lines
12 KiB
C
476 lines
12 KiB
C
/*-
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ken Smith of The State University of New York at Buffalo.
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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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* 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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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1989, 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[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/acl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/mount.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 <grp.h>
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#include <limits.h>
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#include <paths.h>
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#include <pwd.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 <sysexits.h>
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#include <unistd.h>
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int fflg, iflg, nflg, vflg;
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int copy(char *, char *);
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int do_move(char *, char *);
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int fastcopy(char *, char *, struct stat *);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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size_t baselen, len;
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int rval;
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char *p, *endp;
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struct stat sb;
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int ch;
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char path[PATH_MAX];
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while ((ch = getopt(argc, argv, "finv")) != -1)
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switch (ch) {
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case 'i':
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iflg = 1;
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fflg = nflg = 0;
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break;
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case 'f':
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fflg = 1;
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iflg = nflg = 0;
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break;
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case 'n':
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nflg = 1;
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fflg = iflg = 0;
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break;
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case 'v':
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vflg = 1;
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break;
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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 < 2)
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usage();
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/*
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* If the stat on the target fails or the target isn't a directory,
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* try the move. More than 2 arguments is an error in this case.
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*/
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if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
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if (argc > 2)
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usage();
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exit(do_move(argv[0], argv[1]));
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}
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/* It's a directory, move each file into it. */
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if (strlen(argv[argc - 1]) > sizeof(path) - 1)
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errx(1, "%s: destination pathname too long", *argv);
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(void)strcpy(path, argv[argc - 1]);
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baselen = strlen(path);
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endp = &path[baselen];
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if (!baselen || *(endp - 1) != '/') {
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*endp++ = '/';
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++baselen;
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}
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for (rval = 0; --argc; ++argv) {
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/*
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* Find the last component of the source pathname. It
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* may have trailing slashes.
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*/
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p = *argv + strlen(*argv);
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while (p != *argv && p[-1] == '/')
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--p;
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while (p != *argv && p[-1] != '/')
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--p;
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if ((baselen + (len = strlen(p))) >= PATH_MAX) {
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warnx("%s: destination pathname too long", *argv);
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rval = 1;
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} else {
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memmove(endp, p, (size_t)len + 1);
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if (do_move(*argv, path))
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rval = 1;
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}
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}
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exit(rval);
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}
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int
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do_move(char *from, char *to)
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{
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struct stat sb;
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int ask, ch, first;
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char modep[15];
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/*
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* Check access. If interactive and file exists, ask user if it
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* should be replaced. Otherwise if file exists but isn't writable
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* make sure the user wants to clobber it.
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*/
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if (!fflg && !access(to, F_OK)) {
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/* prompt only if source exist */
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if (lstat(from, &sb) == -1) {
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warn("%s", from);
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return (1);
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}
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#define YESNO "(y/n [n]) "
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ask = 0;
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if (nflg) {
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if (vflg)
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printf("%s not overwritten\n", to);
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return (0);
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} else if (iflg) {
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(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
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ask = 1;
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} else if (access(to, W_OK) && !stat(to, &sb)) {
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strmode(sb.st_mode, modep);
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(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
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modep + 1, modep[9] == ' ' ? "" : " ",
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user_from_uid((unsigned long)sb.st_uid, 0),
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group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
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ask = 1;
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}
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if (ask) {
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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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if (first != 'y' && first != 'Y') {
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(void)fprintf(stderr, "not overwritten\n");
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return (0);
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}
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}
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}
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if (!rename(from, to)) {
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if (vflg)
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printf("%s -> %s\n", from, to);
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return (0);
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}
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if (errno == EXDEV) {
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struct statfs sfs;
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char path[PATH_MAX];
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/*
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* If the source is a symbolic link and is on another
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* filesystem, it can be recreated at the destination.
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*/
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if (lstat(from, &sb) == -1) {
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warn("%s", from);
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return (1);
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}
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if (!S_ISLNK(sb.st_mode)) {
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/* Can't mv(1) a mount point. */
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if (realpath(from, path) == NULL) {
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warnx("cannot resolve %s: %s", from, path);
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return (1);
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}
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if (!statfs(path, &sfs) &&
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!strcmp(path, sfs.f_mntonname)) {
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warnx("cannot rename a mount point");
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return (1);
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}
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}
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} else {
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warn("rename %s to %s", from, to);
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return (1);
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}
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/*
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* If rename fails because we're trying to cross devices, and
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* it's a regular file, do the copy internally; otherwise, use
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* cp and rm.
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*/
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if (lstat(from, &sb)) {
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warn("%s", from);
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return (1);
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}
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return (S_ISREG(sb.st_mode) ?
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fastcopy(from, to, &sb) : copy(from, to));
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}
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int
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fastcopy(char *from, char *to, struct stat *sbp)
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{
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struct timeval tval[2];
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static u_int blen;
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static char *bp;
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mode_t oldmode;
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int nread, from_fd, to_fd;
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acl_t acl;
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if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
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warn("%s", from);
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return (1);
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}
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if (blen < sbp->st_blksize) {
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if (bp != NULL)
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free(bp);
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if ((bp = malloc((size_t)sbp->st_blksize)) == NULL) {
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blen = 0;
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warnx("malloc failed");
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return (1);
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}
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blen = sbp->st_blksize;
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}
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while ((to_fd =
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open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
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if (errno == EEXIST && unlink(to) == 0)
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continue;
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warn("%s", to);
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(void)close(from_fd);
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return (1);
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}
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while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
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if (write(to_fd, bp, (size_t)nread) != nread) {
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warn("%s", to);
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goto err;
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}
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if (nread < 0) {
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warn("%s", from);
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err: if (unlink(to))
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warn("%s: remove", to);
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(void)close(from_fd);
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(void)close(to_fd);
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return (1);
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}
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oldmode = sbp->st_mode & ALLPERMS;
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if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
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warn("%s: set owner/group (was: %lu/%lu)", to,
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(u_long)sbp->st_uid, (u_long)sbp->st_gid);
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if (oldmode & (S_ISUID | S_ISGID)) {
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warnx(
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"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
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to, oldmode);
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sbp->st_mode &= ~(S_ISUID | S_ISGID);
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}
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}
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/*
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* POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
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* for dest_file, then it's ACLs shall reflect the ACLs of the
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* source_file.
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*/
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if (fpathconf(to_fd, _PC_ACL_EXTENDED) == 1 &&
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fpathconf(from_fd, _PC_ACL_EXTENDED) == 1) {
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acl = acl_get_fd(from_fd);
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if (acl == NULL)
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warn("failed to get acl entries while setting %s",
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from);
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else if (acl_set_fd(to_fd, acl) < 0)
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warn("failed to set acl entries for %s", to);
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}
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(void)close(from_fd);
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if (fchmod(to_fd, sbp->st_mode))
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warn("%s: set mode (was: 0%03o)", to, oldmode);
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/*
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* XXX
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* NFS doesn't support chflags; ignore errors unless there's reason
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* to believe we're losing bits. (Note, this still won't be right
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* if the server supports flags and we were trying to *remove* flags
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* on a file that we copied, i.e., that we didn't create.)
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*/
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errno = 0;
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if (fchflags(to_fd, (u_long)sbp->st_flags))
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if (errno != EOPNOTSUPP || sbp->st_flags != 0)
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warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
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tval[0].tv_sec = sbp->st_atime;
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tval[1].tv_sec = sbp->st_mtime;
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tval[0].tv_usec = tval[1].tv_usec = 0;
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if (utimes(to, tval))
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warn("%s: set times", to);
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if (close(to_fd)) {
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warn("%s", to);
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return (1);
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}
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if (unlink(from)) {
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warn("%s: remove", from);
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return (1);
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}
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if (vflg)
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printf("%s -> %s\n", from, to);
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return (0);
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}
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int
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copy(char *from, char *to)
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{
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struct stat sb;
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enum clean {CLEAN_SOURCE, CLEAN_DEST, CLEAN_ODEST, CLEAN_MAX};
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char *cleanup[CLEAN_MAX];
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int pid, status;
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volatile int i, rval;
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rval = 0;
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for (i = 0; i < CLEAN_MAX; i++)
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cleanup[i] = NULL;
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/*
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* If "to" exists and is a directory, get it out of the way.
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* When the copy succeeds, delete it.
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*/
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if (stat(to, &sb) == 0 && S_ISDIR(sb.st_mode)) {
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if (asprintf(&cleanup[CLEAN_ODEST], "%s.XXXXXX", to) == -1) {
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warnx("asprintf failed");
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return (1);
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}
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if (rename(to, cleanup[CLEAN_ODEST]) < 0) {
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warn("rename of existing target from %s to %s failed",
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to, cleanup[CLEAN_ODEST]);
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free(cleanup[CLEAN_ODEST]);
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return (1);
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}
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}
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/* Copy source to destination. */
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cleanup[CLEAN_DEST] = to;
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if ((pid = fork()) == 0) {
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execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
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(char *)NULL);
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warn("%s", _PATH_CP);
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_exit(1);
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}
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if (waitpid(pid, &status, 0) == -1) {
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warn("%s: waitpid", _PATH_CP);
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rval = 1;
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goto done;
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}
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if (!WIFEXITED(status)) {
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warnx("%s: did not terminate normally", _PATH_CP);
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rval = 1;
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goto done;
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}
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if (WEXITSTATUS(status)) {
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warnx("%s: terminated with %d (non-zero) status",
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_PATH_CP, WEXITSTATUS(status));
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rval = 1;
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goto done;
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}
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/*
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* The copy succeeded. From now on the destination is where users
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* will find their files.
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*/
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cleanup[CLEAN_DEST] = NULL;
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cleanup[CLEAN_SOURCE] = from;
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done:
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/* Clean what needs to be cleaned. */
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for (i = 0; i < CLEAN_MAX; i++) {
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if (cleanup[i] == NULL)
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continue;
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if (!(pid = vfork())) {
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execl(_PATH_RM, "mv", "-rf", "--", cleanup[i],
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(char *)NULL);
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_exit(EX_OSERR);
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}
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if (waitpid(pid, &status, 0) == -1) {
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warn("%s %s: waitpid", _PATH_RM, cleanup[i]);
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rval = 1;
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continue;
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}
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if (!WIFEXITED(status)) {
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warnx("%s %s: did not terminate normally",
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_PATH_RM, cleanup[i]);
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rval = 1;
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continue;
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}
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switch (WEXITSTATUS(status)) {
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case 0:
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break;
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case EX_OSERR:
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warnx("Failed to exec %s %s", _PATH_RM, cleanup[i]);
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rval = 1;
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continue;
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default:
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warnx("%s %s: terminated with %d (non-zero) status",
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_PATH_RM, cleanup[i], WEXITSTATUS(status));
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rval = 1;
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continue;
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}
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/*
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* If the copy failed, and we just deleted the copy's trash,
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* try to salvage the original destination,
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*/
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if (i == CLEAN_DEST && cleanup[CLEAN_ODEST]) {
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if (rename(cleanup[CLEAN_ODEST], to) < 0) {
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warn("rename back renamed existing target from %s to %s failed",
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cleanup[CLEAN_ODEST], to);
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rval = 1;
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}
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free(cleanup[CLEAN_ODEST]);
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cleanup[CLEAN_ODEST] = NULL;
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}
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}
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if (cleanup[CLEAN_ODEST])
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free(cleanup[CLEAN_ODEST]);
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return (rval);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: mv [-f | -i | -n] [-v] source target",
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" mv [-f | -i | -n] [-v] source ... directory");
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exit(EX_USAGE);
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}
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