home *** CD-ROM | disk | FTP | other *** search
- /* mv -- move or rename files
- Copyright (C) 86, 89, 90, 91, 95, 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <config.h>
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
-
- #include "system.h"
- #include "backupfile.h"
- #include "error.h"
-
- #ifdef HAVE_LCHOWN
- # define chown(PATH, OWNER, GROUP) lchown(PATH, OWNER, GROUP)
- #endif
-
- #ifndef _POSIX_VERSION
- uid_t geteuid ();
- #endif
-
- char *basename ();
- enum backup_type get_version ();
- int isdir ();
- int yesno ();
- int safe_read ();
- int full_write ();
- void strip_trailing_slashes ();
- int euidaccess ();
- char *stpcpy ();
-
- /* The name this program was run with. */
- char *program_name;
-
- /* If nonzero, query the user before overwriting files. */
- static int interactive;
-
- /* If nonzero, do not query the user before overwriting unwritable
- files. */
- static int override_mode;
-
- /* If nonzero, do not move a nondirectory that has an existing destination
- with the same or newer modification time. */
- static int update = 0;
-
- /* If nonzero, list each file as it is moved. */
- static int verbose;
-
- /* If nonzero, stdin is a tty. */
- static int stdin_tty;
-
- /* This process's effective user ID. */
- static uid_t myeuid;
-
- /* FIXME */
- static struct stat dest_stats, source_stats;
-
- /* If nonzero, display usage information and exit. */
- static int show_help;
-
- /* If nonzero, print the version on standard output and exit. */
- static int show_version;
-
- static struct option const long_options[] =
- {
- {"backup", no_argument, NULL, 'b'},
- {"force", no_argument, NULL, 'f'},
- {"interactive", no_argument, NULL, 'i'},
- {"suffix", required_argument, NULL, 'S'},
- {"update", no_argument, &update, 1},
- {"verbose", no_argument, &verbose, 1},
- {"version-control", required_argument, NULL, 'V'},
- {"help", no_argument, &show_help, 1},
- {"version", no_argument, &show_version, 1},
- {NULL, 0, NULL, 0}
- };
-
- /* If PATH is an existing directory, return nonzero, else 0. */
-
- static int
- is_real_dir (char *path)
- {
- struct stat stats;
-
- return lstat (path, &stats) == 0 && S_ISDIR (stats.st_mode);
- }
-
- /* Copy regular file SOURCE onto file DEST.
- Return 1 if an error occurred, 0 if successful. */
-
- static int
- copy_reg (char *source, char *dest)
- {
- int ifd;
- int ofd;
- char buf[1024 * 8];
- int len; /* Number of bytes read into `buf'. */
-
- if (!S_ISREG (source_stats.st_mode))
- {
- error (0, 0, _("cannot move `%s' across filesystems: Not a regular file"),
- source);
- return 1;
- }
-
- if (unlink (dest) && errno != ENOENT)
- {
- error (0, errno, _("cannot remove `%s'"), dest);
- return 1;
- }
-
- ifd = open (source, O_RDONLY, 0);
- if (ifd < 0)
- {
- error (0, errno, "%s", source);
- return 1;
- }
- ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC, 0600);
- if (ofd < 0)
- {
- error (0, errno, "%s", dest);
- close (ifd);
- return 1;
- }
-
- while ((len = safe_read (ifd, buf, sizeof (buf))) > 0)
- {
- if (full_write (ofd, buf, len) < 0)
- {
- error (0, errno, "%s", dest);
- close (ifd);
- close (ofd);
- unlink (dest);
- return 1;
- }
- }
- if (len < 0)
- {
- error (0, errno, "%s", source);
- close (ifd);
- close (ofd);
- unlink (dest);
- return 1;
- }
-
- if (close (ifd) < 0)
- {
- error (0, errno, "%s", source);
- close (ofd);
- return 1;
- }
- if (close (ofd) < 0)
- {
- error (0, errno, "%s", dest);
- return 1;
- }
-
- /* chown turns off set[ug]id bits for non-root,
- so do the chmod last. */
-
- /* Try to copy the old file's modtime and access time. */
- {
- struct utimbuf tv;
-
- tv.actime = source_stats.st_atime;
- tv.modtime = source_stats.st_mtime;
- if (utime (dest, &tv))
- {
- error (0, errno, "%s", dest);
- 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 (dest, source_stats.st_uid, source_stats.st_gid)
- && (errno != EPERM || myeuid == 0))
- {
- error (0, errno, "%s", dest);
- return 1;
- }
-
- if (chmod (dest, source_stats.st_mode & 07777))
- {
- error (0, errno, "%s", dest);
- return 1;
- }
-
- return 0;
- }
-
- /* Move SOURCE onto DEST. Handles cross-filesystem moves.
- If DEST is a directory, SOURCE must be also.
- Return 0 if successful, 1 if an error occurred. */
-
- static int
- do_move (char *source, char *dest)
- {
- char *dest_backup = NULL;
-
- if (lstat (source, &source_stats) != 0)
- {
- error (0, errno, "%s", source);
- return 1;
- }
-
- if (lstat (dest, &dest_stats) == 0)
- {
- if (source_stats.st_dev == dest_stats.st_dev
- && source_stats.st_ino == dest_stats.st_ino)
- {
- error (0, 0, _("`%s' and `%s' are the same file"), source, dest);
- return 1;
- }
-
- if (S_ISDIR (dest_stats.st_mode))
- {
- error (0, 0, _("%s: cannot overwrite directory"), dest);
- return 1;
- }
-
- if (!S_ISDIR (source_stats.st_mode) && update
- && source_stats.st_mtime <= dest_stats.st_mtime)
- return 0;
-
- if (!override_mode && (interactive || stdin_tty)
- && euidaccess (dest, W_OK))
- {
- fprintf (stderr, _("%s: replace `%s', overriding mode %04o? "),
- program_name, dest,
- (unsigned int) (dest_stats.st_mode & 07777));
- if (!yesno ())
- return 0;
- }
- else if (interactive)
- {
- fprintf (stderr, _("%s: replace `%s'? "), program_name, dest);
- if (!yesno ())
- return 0;
- }
-
- if (backup_type != none)
- {
- char *tmp_backup = find_backup_file_name (dest);
- if (tmp_backup == NULL)
- error (1, 0, _("virtual memory exhausted"));
- dest_backup = (char *) alloca (strlen (tmp_backup) + 1);
- strcpy (dest_backup, tmp_backup);
- free (tmp_backup);
- if (rename (dest, dest_backup))
- {
- if (errno != ENOENT)
- {
- error (0, errno, _("cannot backup `%s'"), dest);
- return 1;
- }
- else
- dest_backup = NULL;
- }
- }
- }
- else if (errno != ENOENT)
- {
- error (0, errno, "%s", dest);
- return 1;
- }
-
- if (verbose)
- printf ("%s -> %s\n", source, dest);
-
- if (rename (source, dest) == 0)
- {
- return 0;
- }
-
- if (errno != EXDEV)
- {
- error (0, errno, _("cannot move `%s' to `%s'"), source, dest);
- goto un_backup;
- }
-
- /* rename failed on cross-filesystem link. Copy the file instead. */
-
- if (copy_reg (source, dest))
- goto un_backup;
-
- if (unlink (source))
- {
- error (0, errno, _("cannot remove `%s'"), source);
- return 1;
- }
-
- return 0;
-
- un_backup:
- if (dest_backup)
- {
- if (rename (dest_backup, dest))
- error (0, errno, _("cannot un-backup `%s'"), dest);
- }
- return 1;
- }
-
- /* Move file SOURCE onto DEST. Handles the case when DEST is a directory.
- Return 0 if successful, 1 if an error occurred. */
-
- static int
- movefile (char *source, char *dest)
- {
- strip_trailing_slashes (source);
-
- if ((dest[strlen (dest) - 1] == '/' && !is_real_dir (source))
- || isdir (dest))
- {
- /* Target is a directory; build full target filename. */
- char *base;
- char *new_dest;
-
- base = basename (source);
- /* Remove a (single) trailing slash if there is at least one. */
- if (dest[strlen (dest) - 1] == '/')
- dest[strlen (dest) - 1] = '\0';
- new_dest = (char *) alloca (strlen (dest) + 1 + strlen (base) + 1);
- stpcpy (stpcpy (stpcpy (new_dest, dest), "/"), base);
- return do_move (source, new_dest);
- }
- else
- return do_move (source, dest);
- }
-
- static void
- usage (int status)
- {
- if (status != 0)
- fprintf (stderr, _("Try `%s --help' for more information.\n"),
- program_name);
- else
- {
- printf (_("\
- Usage: %s [OPTION]... SOURCE DEST\n\
- or: %s [OPTION]... SOURCE... DIRECTORY\n\
- "),
- program_name, program_name);
- printf (_("\
- Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.\n\
- \n\
- -b, --backup make backup before removal\n\
- -f, --force remove existing destinations, never prompt\n\
- -i, --interactive prompt before overwrite\n\
- -u, --update move only older or brand new files\n\
- -v, --verbose explain what is being done\n\
- -S, --suffix=SUFFIX override the usual backup suffix\n\
- -V, --version-control=WORD override the usual version control\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- \n\
- "));
- printf (_("\
- The backup suffix is ~, unless set with SIMPLE_BACKUP_SUFFIX. The\n\
- version control may be set with VERSION_CONTROL, values are:\n\
- \n\
- t, numbered make numbered backups\n\
- nil, existing numbered if numbered backups exist, simple otherwise\n\
- never, simple always make simple backups\n"));
- }
- exit (status);
- }
-
- int
- main (int argc, char **argv)
- {
- int c;
- int errors;
- int make_backups = 0;
- char *version;
-
- program_name = argv[0];
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- version = getenv ("SIMPLE_BACKUP_SUFFIX");
- if (version)
- simple_backup_suffix = version;
- version = getenv ("VERSION_CONTROL");
-
- 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 (1);
- }
- }
-
- if (show_version)
- {
- printf ("mv - %s\n", PACKAGE_VERSION);
- exit (0);
- }
-
- if (show_help)
- usage (0);
-
- if (argc < optind + 2)
- {
- error (0, 0, "%s", (argc == optind
- ? _("missing file arguments")
- : _("missing file argument")));
- usage (1);
- }
-
- if (make_backups)
- backup_type = get_version (version);
-
- stdin_tty = isatty (STDIN_FILENO);
-
- 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);
- }
-