source: MondoRescue/branches/3.2/mindi-busybox/coreutils/mv.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Mini mv implementation for busybox
 *
 * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
 * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Size reduction and improved error checking.
 */

#include "libbb.h"
#include "libcoreutils/coreutils.h"

//usage:#define mv_trivial_usage
//usage:       "[-fin] SOURCE DEST\n"
//usage:       "or: mv [-fin] SOURCE... DIRECTORY"
//usage:#define mv_full_usage "\n\n"
//usage:       "Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY\n"
//usage:     "\n    -f  Don't prompt before overwriting"
//usage:     "\n    -i  Interactive, prompt before overwrite"
//usage:     "\n    -n  Don't overwrite an existing file"
//usage:
//usage:#define mv_example_usage
//usage:       "$ mv /tmp/foo /bin/bar\n"

#if ENABLE_FEATURE_MV_LONG_OPTIONS
static const char mv_longopts[] ALIGN1 =
    "interactive\0" No_argument "i"
    "force\0"       No_argument "f"
    "no-clobber\0"  No_argument "n"
    "verbose\0"     No_argument "v"
    ;
#endif

#define OPT_FORCE       (1 << 0)
#define OPT_INTERACTIVE (1 << 1)
#define OPT_NOCLOBBER   (1 << 2)

int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mv_main(int argc, char **argv)
{
    struct stat dest_stat;
    const char *last;
    const char *dest;
    unsigned flags;
    int dest_exists;
    int status = 0;
    int copy_flag = 0;

#if ENABLE_FEATURE_MV_LONG_OPTIONS
    applet_long_options = mv_longopts;
#endif
    /* Need at least two arguments.
     * If more than one of -f, -i, -n is specified , only the final one
     * takes effect (it unsets previous options).
     * -v is accepted but ignored.
     */
    opt_complementary = "-2:f-in:i-fn:n-fi";
    flags = getopt32(argv, "finv");
    argc -= optind;
    argv += optind;
    last = argv[argc - 1];

    if (argc == 2) {
        dest_exists = cp_mv_stat(last, &dest_stat);
        if (dest_exists < 0) {
            return EXIT_FAILURE;
        }

        if (!(dest_exists & 2)) { /* last is not a directory */
            dest = last;
            goto DO_MOVE;
        }
    }

    do {
        dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
        dest_exists = cp_mv_stat(dest, &dest_stat);
        if (dest_exists < 0) {
            goto RET_1;
        }

 DO_MOVE:
        if (dest_exists) {
            if (flags & OPT_NOCLOBBER)
                goto RET_0;
            if (!(flags & OPT_FORCE)
             && ((access(dest, W_OK) < 0 && isatty(0))
                || (flags & OPT_INTERACTIVE))
            ) {
                if (fprintf(stderr, "mv: overwrite '%s'? ", dest) < 0) {
                    goto RET_1;  /* Ouch! fprintf failed! */
                }
                if (!bb_ask_confirmation()) {
                    goto RET_0;
                }
            }
        }

        if (rename(*argv, dest) < 0) {
            struct stat source_stat;
            int source_exists;

            if (errno != EXDEV
             || (source_exists = cp_mv_stat2(*argv, &source_stat, lstat)) < 1
            ) {
                bb_perror_msg("can't rename '%s'", *argv);
            } else {
                static const char fmt[] ALIGN1 =
                    "can't overwrite %sdirectory with %sdirectory";

                if (dest_exists) {
                    if (dest_exists == 3) {
                        if (source_exists != 3) {
                            bb_error_msg(fmt, "", "non-");
                            goto RET_1;
                        }
                    } else {
                        if (source_exists == 3) {
                            bb_error_msg(fmt, "non-", "");
                            goto RET_1;
                        }
                    }
                    if (unlink(dest) < 0) {
                        bb_perror_msg("can't remove '%s'", dest);
                        goto RET_1;
                    }
                }
                /* FILEUTILS_RECUR also prevents nasties like
                 * "read from device and write contents to dst"
                 * instead of "create same device node" */
                copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
#if ENABLE_SELINUX
                copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
#endif
                if ((copy_file(*argv, dest, copy_flag) >= 0)
                 && (remove_file(*argv, FILEUTILS_RECUR | FILEUTILS_FORCE) >= 0)
                ) {
                    goto RET_0;
                }
            }
 RET_1:
            status = 1;
        }
 RET_0:
        if (dest != last) {
            free((void *) dest);
        }
    } while (*++argv != last);

    return status;
}