xref: /src/bin/mv/mv.c

/* $NetBSD: mv.c,v 1.46 2020/06/24 16:58:12 riastradh Exp $ */

/*
 * Copyright (c) 1989, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Smith of The State University of New York at Buffalo.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: mv.c,v 1.46 2020/06/24 16:58:12 riastradh Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/extattr.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pathnames.h"

static int fflg, hflg, iflg, vflg;
static int stdin_ok;
static sig_atomic_t pinfo;

static int	copy(char *, char *);
static int	do_move(char *, char *);
static int	fastcopy(char *, char *, struct stat *);
__dead static void	usage(void);

static void
progress(int sig __unused)
{

	pinfo++;
}

int
main(int argc, char *argv[])
{
	int ch, len, rval;
	char *p, *endp;
	struct stat sb;
	char path[MAXPATHLEN + 1];
	size_t baselen;

	setprogname(argv[0]);
	(void)setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "hifv")) != -1)
		switch (ch) {
		case 'h':
			hflg = 1;
			break;
		case 'i':
			fflg = 0;
			iflg = 1;
			break;
		case 'f':
			iflg = 0;
			fflg = 1;
			break;
		case 'v':
			vflg = 1;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 2)
		usage();

	stdin_ok = isatty(STDIN_FILENO);

	(void)signal(SIGINFO, progress);

	/*
	 * If the stat on the target fails or the target isn't a directory,
	 * try the move.  More than 2 arguments is an error in this case.
	 */
	if (hflg || stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
		if (argc > 2)
			usage();
		exit(do_move(argv[0], argv[1]));
	}

	/* It's a directory, move each file into it. */
	baselen = strlcpy(path, argv[argc - 1], sizeof(path));
	if (baselen >= sizeof(path))
		errx(1, "%s: destination pathname too long", argv[argc - 1]);
	endp = &path[baselen];
	if (!baselen || *(endp - 1) != '/') {
		*endp++ = '/';
		++baselen;
	}
	for (rval = 0; --argc; ++argv) {
		p = *argv + strlen(*argv) - 1;
		while (*p == '/' && p != *argv)
			*p-- = '\0';
		if ((p = strrchr(*argv, '/')) == NULL)
			p = *argv;
		else
			++p;

		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
			warnx("%s: destination pathname too long", *argv);
			rval = 1;
		} else {
			memmove(endp, p, len + 1);
			if (do_move(*argv, path))
				rval = 1;
		}
	}
	exit(rval);
	/* NOTREACHED */
}

static int
do_move(char *from, char *to)
{
	struct stat sb;
	char modep[15];

	/*
	 * (1)	If the destination path exists, the -f option is not specified
	 *	and either of the following conditions are true:
	 *
	 *	(a) The permissions of the destination path do not permit
	 *	    writing and the standard input is a terminal.
	 *	(b) The -i option is specified.
	 *
	 *	the mv utility shall write a prompt to standard error and
	 *	read a line from standard input.  If the response is not
	 *	affirmative, mv shall do nothing more with the current
	 *	source file...
	 */
	if (!fflg && !access(to, F_OK)) {
		int ask = 1;
		int ch;

		if (iflg) {
			if (access(from, F_OK)) {
				warn("rename %s", from);
				return (1);
			}
			(void)fprintf(stderr, "overwrite %s? ", to);
		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
			if (access(from, F_OK)) {
				warn("rename %s", from);
				return (1);
			}
			strmode(sb.st_mode, modep);
			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
			    modep + 1, modep[9] == ' ' ? "" : " ",
			    user_from_uid(sb.st_uid, 0),
			    group_from_gid(sb.st_gid, 0), to);
		} else
			ask = 0;
		if (ask) {
			if ((ch = getchar()) != EOF && ch != '\n') {
				int ch2;
				while ((ch2 = getchar()) != EOF && ch2 != '\n')
					continue;
			}
			if (ch != 'y' && ch != 'Y')
				return (0);
		}
	}

	/*
	 * (2)	If rename() succeeds, mv shall do nothing more with the
	 *	current source file.  If it fails for any other reason than
	 *	EXDEV, mv shall write a diagnostic message to the standard
	 *	error and do nothing more with the current source file.
	 *
	 * (3)	If the destination path exists, and it is a file of type
	 *	directory and source_file is not a file of type directory,
	 *	or it is a file not of type directory, and source file is
	 *	a file of type directory, mv shall write a diagnostic
	 *	message to standard error, and do nothing more with the
	 *	current source file...
	 */
	if (!rename(from, to)) {
		if (vflg)
			printf("%s -> %s\n", from, to);
		return (0);
	}

	if (errno != EXDEV) {
		warn("rename %s to %s", from, to);
		return (1);
	}

	/*
	 * (4)	If the destination path exists, mv shall attempt to remove it.
	 *	If this fails for any reason, mv shall write a diagnostic
	 *	message to the standard error and do nothing more with the
	 *	current source file...
	 */
	if (!lstat(to, &sb)) {
		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
			warn("can't remove %s", to);
			return (1);
		}
	}

	/*
	 * (5)	The file hierarchy rooted in source_file shall be duplicated
	 *	as a file hierarchy rooted in the destination path...
	 */
	if (lstat(from, &sb)) {
		warn("%s", from);
		return (1);
	}

	return (S_ISREG(sb.st_mode) ?
	    fastcopy(from, to, &sb) : copy(from, to));
}

static int
fastcopy(char *from, char *to, struct stat *sbp)
{
#if defined(__NetBSD__)
	struct timespec ts[2];
#else
	struct timeval tval[2];
#endif
	static blksize_t blen;
	static char *bp;
	int from_fd, to_fd;
	ssize_t nread;
	off_t total = 0;

	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
		warn("%s", from);
		return (1);
	}
	if ((to_fd =
	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
		warn("%s", to);
		(void)close(from_fd);
		return (1);
	}
	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
		warn(NULL);
		blen = 0;
		(void)close(from_fd);
		(void)close(to_fd);
		return (1);
	}
	while ((nread = read(from_fd, bp, blen)) > 0) {
		if (write(to_fd, bp, nread) != nread) {
			warn("%s", to);
			goto err;
		}
		total += nread;
		if (pinfo) {
			int pcent = (int)((100.0 * total) / sbp->st_size);

			pinfo = 0;
			(void)fprintf(stderr, "%s => %s %llu/%llu bytes %d%% "
			    "written\n", from, to, (unsigned long long)total,
			    (unsigned long long)sbp->st_size, pcent);
		}
	}
	if (nread < 0) {
		warn("%s", from);
err:		if (unlink(to))
			warn("%s: remove", to);
		(void)close(from_fd);
		(void)close(to_fd);
		return (1);
	}

	if (fcpxattr(from_fd, to_fd) == -1)
		warn("%s: error copying extended attributes", to);

	(void)close(from_fd);
#ifdef BSD4_4
#if defined(__NetBSD__)
	ts[0] = sbp->st_atimespec;
	ts[1] = sbp->st_mtimespec;
#else
	TIMESPEC_TO_TIMEVAL(&tval[0], &sbp->st_atimespec);
	TIMESPEC_TO_TIMEVAL(&tval[1], &sbp->st_mtimespec);
#endif
#else
	tval[0].tv_sec = sbp->st_atime;
	tval[1].tv_sec = sbp->st_mtime;
	tval[0].tv_usec = 0;
	tval[1].tv_usec = 0;
#endif
#ifdef __SVR4
	if (utimes(to, tval))
#else
#if defined(__NetBSD__)
	if (futimens(to_fd, ts))
#else
	if (futimes(to_fd, tval))
#endif
#endif
		warn("%s: set times", to);
	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
		if (errno != EPERM)
			warn("%s: set owner/group", to);
		sbp->st_mode &= ~(S_ISUID | S_ISGID);
	}
	if (fchmod(to_fd, sbp->st_mode))
		warn("%s: set mode", to);
	if (fchflags(to_fd, sbp->st_flags) && (errno != EOPNOTSUPP))
		warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);

	if (close(to_fd)) {
		warn("%s", to);
		return (1);
	}

	if (unlink(from)) {
		warn("%s: remove", from);
		return (1);
	}

	if (vflg)
		printf("%s -> %s\n", from, to);

	return (0);
}

static int
copy(char *from, char *to)
{
	pid_t pid;
	int status;

	if ((pid = vfork()) == 0) {
		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, NULL);
		warn("%s", _PATH_CP);
		_exit(1);
	}
	if (waitpid(pid, &status, 0) == -1) {
		warn("%s: waitpid", _PATH_CP);
		return (1);
	}
	if (!WIFEXITED(status)) {
		warnx("%s: did not terminate normally", _PATH_CP);
		return (1);
	}
	if (WEXITSTATUS(status)) {
		warnx("%s: terminated with %d (non-zero) status",
		    _PATH_CP, WEXITSTATUS(status));
		return (1);
	}
	if (!(pid = vfork())) {
		execl(_PATH_RM, "mv", "-rf", "--", from, NULL);
		warn("%s", _PATH_RM);
		_exit(1);
	}
	if (waitpid(pid, &status, 0) == -1) {
		warn("%s: waitpid", _PATH_RM);
		return (1);
	}
	if (!WIFEXITED(status)) {
		warnx("%s: did not terminate normally", _PATH_RM);
		return (1);
	}
	if (WEXITSTATUS(status)) {
		warnx("%s: terminated with %d (non-zero) status",
		    _PATH_RM, WEXITSTATUS(status));
		return (1);
	}
	return (0);
}

static void
usage(void)
{
	(void)fprintf(stderr, "usage: %s [-fhiv] source target\n"
	    "       %s [-fiv] source ... directory\n", getprogname(),
	    getprogname());
	exit(1);
	/* NOTREACHED */
}