/bin/mv/mv.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 503 lines · 386 code · 36 blank · 81 comment · 128 complexity · eb2b846d3d755428e6030fefecc9dc53 MD5 · raw file
- /*-
- * 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.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if 0
- #ifndef lint
- static char const copyright[] =
- "@(#) Copyright (c) 1989, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #ifndef lint
- static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94";
- #endif /* not lint */
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/types.h>
- #include <sys/acl.h>
- #include <sys/param.h>
- #include <sys/time.h>
- #include <sys/wait.h>
- #include <sys/stat.h>
- #include <sys/mount.h>
- #include <err.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <grp.h>
- #include <limits.h>
- #include <paths.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sysexits.h>
- #include <unistd.h>
- /* Exit code for a failed exec. */
- #define EXEC_FAILED 127
- static int fflg, hflg, iflg, nflg, vflg;
- static int copy(const char *, const char *);
- static int do_move(const char *, const char *);
- static int fastcopy(const char *, const char *, struct stat *);
- static void usage(void);
- static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
- const char *dest_path);
- int
- main(int argc, char *argv[])
- {
- size_t baselen, len;
- int rval;
- char *p, *endp;
- struct stat sb;
- int ch;
- char path[PATH_MAX];
- while ((ch = getopt(argc, argv, "fhinv")) != -1)
- switch (ch) {
- case 'h':
- hflg = 1;
- break;
- case 'i':
- iflg = 1;
- fflg = nflg = 0;
- break;
- case 'f':
- fflg = 1;
- iflg = nflg = 0;
- break;
- case 'n':
- nflg = 1;
- fflg = iflg = 0;
- break;
- case 'v':
- vflg = 1;
- break;
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
- if (argc < 2)
- usage();
- /*
- * 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 (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
- if (argc > 2)
- usage();
- exit(do_move(argv[0], argv[1]));
- }
- /*
- * If -h was specified, treat the target as a symlink instead of
- * directory.
- */
- if (hflg) {
- if (argc > 2)
- usage();
- if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode))
- exit(do_move(argv[0], argv[1]));
- }
- /* It's a directory, move each file into it. */
- if (strlen(argv[argc - 1]) > sizeof(path) - 1)
- errx(1, "%s: destination pathname too long", *argv);
- (void)strcpy(path, argv[argc - 1]);
- baselen = strlen(path);
- endp = &path[baselen];
- if (!baselen || *(endp - 1) != '/') {
- *endp++ = '/';
- ++baselen;
- }
- for (rval = 0; --argc; ++argv) {
- /*
- * Find the last component of the source pathname. It
- * may have trailing slashes.
- */
- p = *argv + strlen(*argv);
- while (p != *argv && p[-1] == '/')
- --p;
- while (p != *argv && p[-1] != '/')
- --p;
- if ((baselen + (len = strlen(p))) >= PATH_MAX) {
- warnx("%s: destination pathname too long", *argv);
- rval = 1;
- } else {
- memmove(endp, p, (size_t)len + 1);
- if (do_move(*argv, path))
- rval = 1;
- }
- }
- exit(rval);
- }
- static int
- do_move(const char *from, const char *to)
- {
- struct stat sb;
- int ask, ch, first;
- char modep[15];
- /*
- * Check access. If interactive and file exists, ask user if it
- * should be replaced. Otherwise if file exists but isn't writable
- * make sure the user wants to clobber it.
- */
- if (!fflg && !access(to, F_OK)) {
- /* prompt only if source exist */
- if (lstat(from, &sb) == -1) {
- warn("%s", from);
- return (1);
- }
- #define YESNO "(y/n [n]) "
- ask = 0;
- if (nflg) {
- if (vflg)
- printf("%s not overwritten\n", to);
- return (0);
- } else if (iflg) {
- (void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
- ask = 1;
- } else if (access(to, W_OK) && !stat(to, &sb)) {
- strmode(sb.st_mode, modep);
- (void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
- modep + 1, modep[9] == ' ' ? "" : " ",
- user_from_uid((unsigned long)sb.st_uid, 0),
- group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
- ask = 1;
- }
- if (ask) {
- first = ch = getchar();
- while (ch != '\n' && ch != EOF)
- ch = getchar();
- if (first != 'y' && first != 'Y') {
- (void)fprintf(stderr, "not overwritten\n");
- return (0);
- }
- }
- }
- /*
- * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing
- * with EXDEV. Therefore, copy() doesn't have to perform the checks
- * specified in the Step 3 of the POSIX mv specification.
- */
- if (!rename(from, to)) {
- if (vflg)
- printf("%s -> %s\n", from, to);
- return (0);
- }
- if (errno == EXDEV) {
- struct statfs sfs;
- char path[PATH_MAX];
- /*
- * If the source is a symbolic link and is on another
- * filesystem, it can be recreated at the destination.
- */
- if (lstat(from, &sb) == -1) {
- warn("%s", from);
- return (1);
- }
- if (!S_ISLNK(sb.st_mode)) {
- /* Can't mv(1) a mount point. */
- if (realpath(from, path) == NULL) {
- warn("cannot resolve %s: %s", from, path);
- return (1);
- }
- if (!statfs(path, &sfs) &&
- !strcmp(path, sfs.f_mntonname)) {
- warnx("cannot rename a mount point");
- return (1);
- }
- }
- } else {
- warn("rename %s to %s", from, to);
- return (1);
- }
- /*
- * If rename fails because we're trying to cross devices, and
- * it's a regular file, do the copy internally; otherwise, use
- * cp and rm.
- */
- 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(const char *from, const char *to, struct stat *sbp)
- {
- struct timeval tval[2];
- static u_int blen = MAXPHYS;
- static char *bp = NULL;
- mode_t oldmode;
- int nread, from_fd, to_fd;
- if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
- warn("fastcopy: open() failed (from): %s", from);
- return (1);
- }
- if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) {
- warnx("malloc(%u) failed", blen);
- return (1);
- }
- while ((to_fd =
- open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
- if (errno == EEXIST && unlink(to) == 0)
- continue;
- warn("fastcopy: open() failed (to): %s", to);
- (void)close(from_fd);
- return (1);
- }
- while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
- if (write(to_fd, bp, (size_t)nread) != nread) {
- warn("fastcopy: write() failed: %s", to);
- goto err;
- }
- if (nread < 0) {
- warn("fastcopy: read() failed: %s", from);
- err: if (unlink(to))
- warn("%s: remove", to);
- (void)close(from_fd);
- (void)close(to_fd);
- return (1);
- }
- oldmode = sbp->st_mode & ALLPERMS;
- if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
- warn("%s: set owner/group (was: %lu/%lu)", to,
- (u_long)sbp->st_uid, (u_long)sbp->st_gid);
- if (oldmode & (S_ISUID | S_ISGID)) {
- warnx(
- "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
- to, oldmode);
- sbp->st_mode &= ~(S_ISUID | S_ISGID);
- }
- }
- if (fchmod(to_fd, sbp->st_mode))
- warn("%s: set mode (was: 0%03o)", to, oldmode);
- /*
- * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
- * for dest_file, then its ACLs shall reflect the ACLs of the
- * source_file.
- */
- preserve_fd_acls(from_fd, to_fd, from, to);
- (void)close(from_fd);
- /*
- * XXX
- * NFS doesn't support chflags; ignore errors unless there's reason
- * to believe we're losing bits. (Note, this still won't be right
- * if the server supports flags and we were trying to *remove* flags
- * on a file that we copied, i.e., that we didn't create.)
- */
- errno = 0;
- if (fchflags(to_fd, (u_long)sbp->st_flags))
- if (errno != EOPNOTSUPP || sbp->st_flags != 0)
- warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
- tval[0].tv_sec = sbp->st_atime;
- tval[1].tv_sec = sbp->st_mtime;
- tval[0].tv_usec = tval[1].tv_usec = 0;
- if (utimes(to, tval))
- warn("%s: set times", to);
- 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(const char *from, const char *to)
- {
- struct stat sb;
- int pid, status;
- if (lstat(to, &sb) == 0) {
- /* Destination path exists. */
- if (S_ISDIR(sb.st_mode)) {
- if (rmdir(to) != 0) {
- warn("rmdir %s", to);
- return (1);
- }
- } else {
- if (unlink(to) != 0) {
- warn("unlink %s", to);
- return (1);
- }
- }
- } else if (errno != ENOENT) {
- warn("%s", to);
- return (1);
- }
- /* Copy source to destination. */
- if (!(pid = vfork())) {
- execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
- (char *)NULL);
- _exit(EXEC_FAILED);
- }
- if (waitpid(pid, &status, 0) == -1) {
- warn("%s %s %s: waitpid", _PATH_CP, from, to);
- return (1);
- }
- if (!WIFEXITED(status)) {
- warnx("%s %s %s: did not terminate normally",
- _PATH_CP, from, to);
- return (1);
- }
- switch (WEXITSTATUS(status)) {
- case 0:
- break;
- case EXEC_FAILED:
- warnx("%s %s %s: exec failed", _PATH_CP, from, to);
- return (1);
- default:
- warnx("%s %s %s: terminated with %d (non-zero) status",
- _PATH_CP, from, to, WEXITSTATUS(status));
- return (1);
- }
- /* Delete the source. */
- if (!(pid = vfork())) {
- execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
- _exit(EXEC_FAILED);
- }
- if (waitpid(pid, &status, 0) == -1) {
- warn("%s %s: waitpid", _PATH_RM, from);
- return (1);
- }
- if (!WIFEXITED(status)) {
- warnx("%s %s: did not terminate normally", _PATH_RM, from);
- return (1);
- }
- switch (WEXITSTATUS(status)) {
- case 0:
- break;
- case EXEC_FAILED:
- warnx("%s %s: exec failed", _PATH_RM, from);
- return (1);
- default:
- warnx("%s %s: terminated with %d (non-zero) status",
- _PATH_RM, from, WEXITSTATUS(status));
- return (1);
- }
- return (0);
- }
- static void
- preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
- const char *dest_path)
- {
- acl_t acl;
- acl_type_t acl_type;
- int acl_supported = 0, ret, trivial;
- ret = fpathconf(source_fd, _PC_ACL_NFS4);
- if (ret > 0 ) {
- acl_supported = 1;
- acl_type = ACL_TYPE_NFS4;
- } else if (ret < 0 && errno != EINVAL) {
- warn("fpathconf(..., _PC_ACL_NFS4) failed for %s",
- source_path);
- return;
- }
- if (acl_supported == 0) {
- ret = fpathconf(source_fd, _PC_ACL_EXTENDED);
- if (ret > 0 ) {
- acl_supported = 1;
- acl_type = ACL_TYPE_ACCESS;
- } else if (ret < 0 && errno != EINVAL) {
- warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s",
- source_path);
- return;
- }
- }
- if (acl_supported == 0)
- return;
- acl = acl_get_fd_np(source_fd, acl_type);
- if (acl == NULL) {
- warn("failed to get acl entries for %s", source_path);
- return;
- }
- if (acl_is_trivial_np(acl, &trivial)) {
- warn("acl_is_trivial() failed for %s", source_path);
- acl_free(acl);
- return;
- }
- if (trivial) {
- acl_free(acl);
- return;
- }
- if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) {
- warn("failed to set acl entries for %s", dest_path);
- acl_free(acl);
- return;
- }
- acl_free(acl);
- }
- static void
- usage(void)
- {
- (void)fprintf(stderr, "%s\n%s\n",
- "usage: mv [-f | -i | -n] [-hv] source target",
- " mv [-f | -i | -n] [-v] source ... directory");
- exit(EX_USAGE);
- }