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Diffstat (limited to 'bin/mv/mv.c')
| -rw-r--r-- | bin/mv/mv.c | 514 |
1 files changed, 514 insertions, 0 deletions
diff --git a/bin/mv/mv.c b/bin/mv/mv.c new file mode 100644 index 000000000000..01d88ff625b7 --- /dev/null +++ b/bin/mv/mv.c @@ -0,0 +1,514 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. + */ + +#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) + errx(1, "%s is not a directory", argv[argc - 1]); + 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) && isatty(STDIN_FILENO)) { + 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 timespec ts[2]; + static u_int blen = MAXPHYS; + static char *bp = NULL; + mode_t oldmode; + int nread, from_fd, to_fd; + struct stat tsb; + + 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); + (void)close(from_fd); + 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.) + */ + if (fstat(to_fd, &tsb) == 0) { + if ((sbp->st_flags & ~UF_ARCHIVE) != + (tsb.st_flags & ~UF_ARCHIVE)) { + if (fchflags(to_fd, + sbp->st_flags | (tsb.st_flags & UF_ARCHIVE))) + if (errno != EOPNOTSUPP || + ((sbp->st_flags & ~UF_ARCHIVE) != 0)) + warn("%s: set flags (was: 0%07o)", + to, sbp->st_flags); + } + } else + warn("%s: cannot stat", to); + + ts[0] = sbp->st_atim; + ts[1] = sbp->st_mtim; + if (futimens(to_fd, ts)) + 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); +} |