home *** CD-ROM | disk | FTP | other *** search
- /* mv -- move or rename files
- Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Options:
- -f, --force Assume a 'y' answer to all questions it would
- normally ask, and not ask the questions.
-
- -i, --interactive Require confirmation from the user before
- performing any move that would destroy an
- existing file.
-
- -u, --update Do not move a nondirectory that has an
- existing destination with the same or newer
- modification time.
-
- -v, --verbose List the name of each file as it is moved, and
- the name it is moved to.
-
- -b, --backup
- -S, --suffix
- -V, --version-control
- Backup file creation.
-
- Written by Mike Parker and David MacKenzie */
-
- #ifdef _AIX
- #pragma alloca
- #endif
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include "system.h"
- #include "backupfile.h"
-
- #ifndef _POSIX_VERSION
- uid_t geteuid ();
- #endif
-
- enum backup_type get_version ();
- int copy_reg ();
- int do_move ();
- int eaccess_stat ();
- int isdir ();
- int movefile ();
- int yesno ();
- void error ();
- void strip_trailing_slashes ();
- void usage ();
-
- /* The name this program was run with. */
- char *program_name;
-
- /* If nonzero, query the user before overwriting files. */
- int interactive;
-
- /* If nonzero, do not query the user before overwriting unwritable
- files. */
- int override_mode;
-
- /* If nonzero, do not move a nondirectory that has an existing destination
- with the same or newer modification time. */
- int update = 0;
-
- /* If nonzero, list each file as it is moved. */
- int verbose;
-
- /* If nonzero, stdin is a tty. */
- int stdin_tty;
-
- /* This process's effective user ID. */
- uid_t myeuid;
-
- struct option long_options[] =
- {
- {"backup", 0, NULL, 'b'},
- {"force", 0, NULL, 'f'},
- {"interactive", 0, NULL, 'i'},
- {"suffix", 1, NULL, 'S'},
- {"update", 0, &update, 1},
- {"verbose", 0, &verbose, 1},
- {"version-control", 1, NULL, 'V'},
- {NULL, 0, NULL, 0}
- };
-
- void
- main (argc, argv)
- int argc;
- char **argv;
- {
- int c;
- int errors;
- int make_backups = 0;
- char *version;
-
- version = getenv ("SIMPLE_BACKUP_SUFFIX");
- if (version)
- simple_backup_suffix = version;
- version = getenv ("VERSION_CONTROL");
- program_name = argv[0];
- myeuid = geteuid ();
- interactive = override_mode = verbose = update = 0;
- errors = 0;
-
- while ((c = getopt_long (argc, argv, "bfiuvS:V:", long_options, (int *) 0))
- != EOF)
- {
- switch (c)
- {
- case 0:
- break;
- case 'b':
- make_backups = 1;
- break;
- case 'f':
- interactive = 0;
- override_mode = 1;
- break;
- case 'i':
- interactive = 1;
- override_mode = 0;
- break;
- case 'u':
- update = 1;
- break;
- case 'v':
- verbose = 1;
- break;
- case 'S':
- simple_backup_suffix = optarg;
- break;
- case 'V':
- version = optarg;
- break;
- default:
- usage ();
- }
- }
- if (argc < optind + 2)
- usage ();
-
- if (make_backups)
- backup_type = get_version (version);
-
- stdin_tty = isatty (0);
-
- strip_trailing_slashes (argv[argc - 1]);
-
- if (argc > optind + 2 && !isdir (argv[argc - 1]))
- error (1, 0, "when moving multiple files, last argument must be a directory");
-
- /* Move each arg but the last onto the last. */
- for (; optind < argc - 1; ++optind)
- errors |= movefile (argv[optind], argv[argc - 1]);
-
- exit (errors);
- }
-
- /* Move file FROM onto TO. Handles the case when TO is a directory.
- Return 0 if successful, 1 if an error occurred. */
-
- int
- movefile (from, to)
- char *from;
- char *to;
- {
- strip_trailing_slashes (from);
- if (isdir (to))
- {
- /* Target is a directory; build full target filename. */
- char *cp;
- char *newto;
-
- cp = rindex (from, '/');
- #ifdef AMIGA
- if (!cp) cp = rindex (from, ':');
- #endif
- if (cp)
- cp++;
- else
- cp = from;
-
- newto = (char *) alloca (strlen (to) + 1 + strlen (cp) + 1);
- #ifdef AMIGA
- AddPart(strcpy(newto, to), cp, strlen (to) + 1 + strlen (cp) + 1);
- #else
- sprintf (newto, "%s/%s", to, cp);
- #endif
- return do_move (from, newto);
- }
- else
- return do_move (from, to);
- }
-
- struct stat to_stats, from_stats;
-
- /* Move FROM onto TO. Handles cross-filesystem moves.
- If TO is a directory, FROM must be also.
- Return 0 if successful, 1 if an error occurred. */
-
- int
- do_move (from, to)
- char *from;
- char *to;
- {
- char *to_backup = NULL;
-
- if (lstat (from, &from_stats) != 0)
- {
- error (0, errno, "%s", from);
- return 1;
- }
-
- if (lstat (to, &to_stats) == 0)
- {
- if (from_stats.st_dev == to_stats.st_dev
- && from_stats.st_ino == to_stats.st_ino)
- {
- error (0, 0, "`%s' and `%s' are the same file", from, to);
- return 1;
- }
-
- if (S_ISDIR (to_stats.st_mode))
- {
- error (0, 0, "%s: cannot overwrite directory", to);
- return 1;
- }
-
- if (!S_ISDIR (from_stats.st_mode) && update
- && from_stats.st_mtime <= to_stats.st_mtime)
- return 0;
-
- if (!override_mode && (interactive || stdin_tty)
- && eaccess_stat (&to_stats, W_OK))
- {
- fprintf (stderr, "%s: replace `%s', overriding mode %04o? ",
- program_name, to, to_stats.st_mode & 07777);
- if (!yesno ())
- return 0;
- }
- else if (interactive)
- {
- fprintf (stderr, "%s: replace `%s'? ", program_name, to);
- if (!yesno ())
- return 0;
- }
-
- if (backup_type != none)
- {
- char *tmp_backup = find_backup_file_name (to);
- if (tmp_backup == NULL)
- error (1, 0, "virtual memory exhausted");
- to_backup = alloca (strlen (tmp_backup) + 1);
- strcpy (to_backup, tmp_backup);
- free (tmp_backup);
- if (rename (to, to_backup))
- {
- if (errno != ENOENT)
- {
- error (0, errno, "cannot backup `%s'", to);
- return 1;
- }
- else
- to_backup = NULL;
- }
- }
- }
- else if (errno != ENOENT)
- {
- error (0, errno, "%s", to);
- return 1;
- }
-
- if (verbose)
- printf ("%s -> %s\n", from, to);
-
- if (rename (from, to) == 0)
- {
- return 0;
- }
-
- if (errno != EXDEV)
- {
- error (0, errno, "cannot move `%s' to `%s'", from, to);
- goto un_backup;
- }
-
- /* rename failed on cross-filesystem link. Copy the file instead. */
-
- if (copy_reg (from, to))
- goto un_backup;
-
- if (unlink (from))
- {
- error (0, errno, "cannot remove `%s'", from);
- return 1;
- }
-
- return 0;
-
- un_backup:
- if (to_backup)
- {
- if (rename (to_backup, to))
- error (0, errno, "cannot un-backup `%s'", to);
- }
- return 1;
- }
-
- /* Copy regular file FROM onto file TO.
- Return 1 if an error occurred, 0 if successful. */
-
- int
- copy_reg (from, to)
- char *from, *to;
- {
- int ifd;
- int ofd;
- char buf[1024 * 8];
- int len; /* Number of bytes read into `buf'. */
-
- if (!S_ISREG (from_stats.st_mode))
- {
- error (0, 0, "cannot move `%s' across filesystems: Not a regular file",
- from);
- return 1;
- }
-
- if (unlink (to) && errno != ENOENT)
- {
- error (0, errno, "cannot remove `%s'", to);
- return 1;
- }
-
- ifd = open (from, O_RDONLY, 0);
- if (ifd < 0)
- {
- error (0, errno, "%s", from);
- return 1;
- }
- ofd = open (to, O_WRONLY | O_CREAT | O_TRUNC, 0600);
- if (ofd < 0)
- {
- error (0, errno, "%s", to);
- close (ifd);
- return 1;
- }
- #ifdef HAVE_FCHMOD
- if (fchmod (ofd, from_stats.st_mode & 0777))
- {
- error (0, errno, "%s", to);
- close (ifd);
- close (ofd);
- unlink (to);
- return 1;
- }
- #endif
-
- while ((len = read (ifd, buf, sizeof (buf))) > 0)
- {
- int wrote = 0;
- char *bp = buf;
-
- do
- {
- wrote = write (ofd, bp, len);
- if (wrote < 0)
- {
- error (0, errno, "%s", to);
- close (ifd);
- close (ofd);
- unlink (to);
- return 1;
- }
- bp += wrote;
- len -= wrote;
- } while (len > 0);
- }
- if (len < 0)
- {
- error (0, errno, "%s", from);
- close (ifd);
- close (ofd);
- unlink (to);
- return 1;
- }
-
- if (close (ifd) < 0)
- {
- error (0, errno, "%s", from);
- close (ofd);
- return 1;
- }
- if (close (ofd) < 0)
- {
- error (0, errno, "%s", to);
- return 1;
- }
-
- #ifndef HAVE_FCHMOD
- if (chmod (to, from_stats.st_mode & 0777))
- {
- error (0, errno, "%s", to);
- return 1;
- }
- #endif
-
- /* Try to copy the old file's modtime and access time. */
- {
- struct utimbuf tv;
-
- tv.actime = from_stats.st_atime;
- tv.modtime = from_stats.st_mtime;
- if (utime (to, &tv))
- {
- error (0, errno, "%s", to);
- return 1;
- }
- }
-
- /* Try to preserve ownership. For non-root it might fail, but that's ok.
- But root probably wants to know, e.g. if NFS disallows it. */
- if (chown (to, from_stats.st_uid, from_stats.st_gid)
- && (errno != EPERM || myeuid == 0))
- {
- error (0, errno, "%s", to);
- return 1;
- }
-
- return 0;
- }
-
- void
- usage ()
- {
- fprintf (stderr, "\
- Usage: %s [options] source dest\n\
- %s [options] source... directory\n\
- Options:\n\
- [-bfiuv] [-S backup-suffix] [-V {numbered,existing,simple}]\n\
- [--backup] [--force] [--interactive] [--update] [--verbose]\n\
- [--suffix=backup-suffix] [--version-control={numbered,existing,simple}]\n",
- program_name, program_name);
- exit (1);
- }
-