f9d4afb439
For these simple utilities, it doesn't harm to make all global variables static. In fact, this allows the compiler to perform better forms of optimisation and analysis.
490 lines
12 KiB
C
490 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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/* Exit code for a failed exec. */
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#define EXEC_FAILED 127
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static int fflg, iflg, nflg, vflg;
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static int copy(const char *, const char *);
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static int do_move(const char *, const char *);
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static int fastcopy(const char *, const char *, struct stat *);
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static void usage(void);
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static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
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const char *dest_path);
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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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static int
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do_move(const char *from, const 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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/*
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* Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing
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* with EXDEV. Therefore, copy() doesn't have to perform the checks
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* specified in the Step 3 of the POSIX mv specification.
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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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warn("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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static int
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fastcopy(const char *from, const 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 = MAXPHYS;
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static char *bp = NULL;
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mode_t oldmode;
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int nread, from_fd, to_fd;
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if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
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warn("fastcopy: open() failed (from): %s", from);
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return (1);
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}
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if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) {
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warnx("malloc(%u) failed", blen);
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return (1);
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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("fastcopy: open() failed (to): %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("fastcopy: write() failed: %s", to);
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goto err;
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}
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if (nread < 0) {
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warn("fastcopy: read() failed: %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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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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* POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
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* for dest_file, then its ACLs shall reflect the ACLs of the
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* source_file.
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*/
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preserve_fd_acls(from_fd, to_fd, from, to);
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(void)close(from_fd);
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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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static int
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copy(const char *from, const char *to)
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{
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struct stat sb;
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int pid, status;
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if (lstat(to, &sb) == 0) {
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/* Destination path exists. */
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if (S_ISDIR(sb.st_mode)) {
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if (rmdir(to) != 0) {
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warn("rmdir %s", to);
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return (1);
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}
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} else {
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if (unlink(to) != 0) {
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warn("unlink %s", to);
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return (1);
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}
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}
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} else if (errno != ENOENT) {
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warn("%s", to);
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return (1);
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}
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/* Copy source to destination. */
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if (!(pid = vfork())) {
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execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
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(char *)NULL);
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_exit(EXEC_FAILED);
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}
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if (waitpid(pid, &status, 0) == -1) {
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warn("%s %s %s: waitpid", _PATH_CP, from, to);
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return (1);
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}
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if (!WIFEXITED(status)) {
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warnx("%s %s %s: did not terminate normally",
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_PATH_CP, from, to);
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return (1);
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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 EXEC_FAILED:
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warnx("%s %s %s: exec failed", _PATH_CP, from, to);
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return (1);
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default:
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warnx("%s %s %s: terminated with %d (non-zero) status",
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_PATH_CP, from, to, WEXITSTATUS(status));
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return (1);
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}
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/* Delete the source. */
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if (!(pid = vfork())) {
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execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
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_exit(EXEC_FAILED);
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}
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if (waitpid(pid, &status, 0) == -1) {
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warn("%s %s: waitpid", _PATH_RM, from);
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return (1);
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}
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if (!WIFEXITED(status)) {
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warnx("%s %s: did not terminate normally", _PATH_RM, from);
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return (1);
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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 EXEC_FAILED:
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warnx("%s %s: exec failed", _PATH_RM, from);
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return (1);
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default:
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warnx("%s %s: terminated with %d (non-zero) status",
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_PATH_RM, from, WEXITSTATUS(status));
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return (1);
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}
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return (0);
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}
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static void
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preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
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const char *dest_path)
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{
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acl_t acl;
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acl_type_t acl_type;
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int acl_supported = 0, ret, trivial;
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ret = fpathconf(source_fd, _PC_ACL_NFS4);
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if (ret > 0 ) {
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acl_supported = 1;
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acl_type = ACL_TYPE_NFS4;
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} else if (ret < 0 && errno != EINVAL) {
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warn("fpathconf(..., _PC_ACL_NFS4) failed for %s",
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source_path);
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return;
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}
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if (acl_supported == 0) {
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ret = fpathconf(source_fd, _PC_ACL_EXTENDED);
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if (ret > 0 ) {
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acl_supported = 1;
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acl_type = ACL_TYPE_ACCESS;
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} else if (ret < 0 && errno != EINVAL) {
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warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s",
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source_path);
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return;
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}
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}
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if (acl_supported == 0)
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return;
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acl = acl_get_fd_np(source_fd, acl_type);
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if (acl == NULL) {
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warn("failed to get acl entries for %s", source_path);
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return;
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}
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if (acl_is_trivial_np(acl, &trivial)) {
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warn("acl_is_trivial() failed for %s", source_path);
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acl_free(acl);
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return;
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}
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if (trivial) {
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acl_free(acl);
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return;
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}
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if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) {
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warn("failed to set acl entries for %s", dest_path);
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acl_free(acl);
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return;
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}
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acl_free(acl);
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}
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static 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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