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

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
File size: 6.1 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini cp implementation for busybox
4 *
5 * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
6 * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
10
11/* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */
12
13/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
14 *
15 * Size reduction.
16 */
17
18//usage:#define cp_trivial_usage
19//usage:       "[OPTIONS] SOURCE... DEST"
20//usage:#define cp_full_usage "\n\n"
21//usage:       "Copy SOURCE(s) to DEST\n"
22//usage:     "\n    -a  Same as -dpR"
23//usage:    IF_SELINUX(
24//usage:     "\n    -c  Preserve security context"
25//usage:    )
26//usage:     "\n    -R,-r   Recurse"
27//usage:     "\n    -d,-P   Preserve symlinks (default if -R)"
28//usage:     "\n    -L  Follow all symlinks"
29//usage:     "\n    -H  Follow symlinks on command line"
30//usage:     "\n    -p  Preserve file attributes if possible"
31//usage:     "\n    -f  Overwrite"
32//usage:     "\n    -i  Prompt before overwrite"
33//usage:     "\n    -l,-s   Create (sym)links"
34
35#include "libbb.h"
36#include "libcoreutils/coreutils.h"
37
38/* This is a NOEXEC applet. Be very careful! */
39
40int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
41int cp_main(int argc, char **argv)
42{
43    struct stat source_stat;
44    struct stat dest_stat;
45    const char *last;
46    const char *dest;
47    int s_flags;
48    int d_flags;
49    int flags;
50    int status;
51    enum {
52        OPT_a = 1 << (sizeof(FILEUTILS_CP_OPTSTR)-1),
53        OPT_r = 1 << (sizeof(FILEUTILS_CP_OPTSTR)),
54        OPT_P = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+1),
55        OPT_v = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+2),
56#if ENABLE_FEATURE_CP_LONG_OPTIONS
57        OPT_parents = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+3),
58#endif
59    };
60
61    // Need at least two arguments
62    // Soft- and hardlinking doesn't mix
63    // -P and -d are the same (-P is POSIX, -d is GNU)
64    // -r and -R are the same
65    // -R (and therefore -r) turns on -d (coreutils does this)
66    // -a = -pdR
67    opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
68#if ENABLE_FEATURE_CP_LONG_OPTIONS
69    applet_long_options =
70        "archive\0"        No_argument "a"
71        "force\0"          No_argument "f"
72        "interactive\0"    No_argument "i"
73        "link\0"           No_argument "l"
74        "dereference\0"    No_argument "L"
75        "no-dereference\0" No_argument "P"
76        "recursive\0"      No_argument "R"
77        "symbolic-link\0"  No_argument "s"
78        "verbose\0"        No_argument "v"
79        "parents\0"        No_argument "\xff"
80        ;
81#endif
82    // -v (--verbose) is ignored
83    flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPv");
84    /* Options of cp from GNU coreutils 6.10:
85     * -a, --archive
86     * -f, --force
87     * -i, --interactive
88     * -l, --link
89     * -L, --dereference
90     * -P, --no-dereference
91     * -R, -r, --recursive
92     * -s, --symbolic-link
93     * -v, --verbose
94     * -H   follow command-line symbolic links in SOURCE
95     * -d   same as --no-dereference --preserve=links
96     * -p   same as --preserve=mode,ownership,timestamps
97     * -c   same as --preserve=context
98     * --parents
99     *  use full source file name under DIRECTORY
100     * NOT SUPPORTED IN BBOX:
101     * --backup[=CONTROL]
102     *  make a backup of each existing destination file
103     * -b   like --backup but does not accept an argument
104     * --copy-contents
105     *  copy contents of special files when recursive
106     * --preserve[=ATTR_LIST]
107     *  preserve attributes (default: mode,ownership,timestamps),
108     *  if possible additional attributes: security context,links,all
109     * --no-preserve=ATTR_LIST
110     * --remove-destination
111     *  remove  each existing destination file before attempting to open
112     * --sparse=WHEN
113     *  control creation of sparse files
114     * --strip-trailing-slashes
115     *  remove any trailing slashes from each SOURCE argument
116     * -S, --suffix=SUFFIX
117     *  override the usual backup suffix
118     * -t, --target-directory=DIRECTORY
119     *  copy all SOURCE arguments into DIRECTORY
120     * -T, --no-target-directory
121     *  treat DEST as a normal file
122     * -u, --update
123     *  copy only when the SOURCE file is newer than the destination
124     *  file or when the destination file is missing
125     * -x, --one-file-system
126     *  stay on this file system
127     * -Z, --context=CONTEXT
128     *  (SELinux) set SELinux security context of copy to CONTEXT
129     */
130    argc -= optind;
131    argv += optind;
132    /* Reverse this bit. If there is -d, bit is not set: */
133    flags ^= FILEUTILS_DEREFERENCE;
134    /* coreutils 6.9 compat:
135     * by default, "cp" derefs symlinks (creates regular dest files),
136     * but "cp -R" does not. We switch off deref if -r or -R (see above).
137     * However, "cp -RL" must still deref symlinks: */
138    if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */
139        flags |= FILEUTILS_DEREFERENCE;
140
141#if ENABLE_SELINUX
142    if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) {
143        selinux_or_die();
144    }
145#endif
146
147    status = EXIT_SUCCESS;
148    last = argv[argc - 1];
149    /* If there are only two arguments and...  */
150    if (argc == 2) {
151        s_flags = cp_mv_stat2(*argv, &source_stat,
152                (flags & FILEUTILS_DEREFERENCE) ? stat : lstat);
153        if (s_flags < 0)
154            return EXIT_FAILURE;
155        d_flags = cp_mv_stat(last, &dest_stat);
156        if (d_flags < 0)
157            return EXIT_FAILURE;
158
159#if ENABLE_FEATURE_CP_LONG_OPTIONS
160        if (flags & OPT_parents) {
161            if (!(d_flags & 2)) {
162                bb_error_msg_and_die("with --parents, the destination must be a directory");
163            }
164        }
165#endif
166
167        /* ...if neither is a directory...  */
168        if (!((s_flags | d_flags) & 2)
169            /* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */
170         || ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags)
171        ) {
172            /* Do a simple copy */
173            dest = last;
174            goto DO_COPY; /* NB: argc==2 -> *++argv==last */
175        }
176    }
177
178    while (1) {
179#if ENABLE_FEATURE_CP_LONG_OPTIONS
180        if (flags & OPT_parents) {
181            char *dest_dup;
182            char *dest_dir;
183            dest = concat_path_file(last, *argv);
184            dest_dup = xstrdup(dest);
185            dest_dir = dirname(dest_dup);
186            if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) {
187                return EXIT_FAILURE;
188            }
189            free(dest_dup);
190            goto DO_COPY;
191        }
192#endif
193        dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
194 DO_COPY:
195        if (copy_file(*argv, dest, flags) < 0) {
196            status = EXIT_FAILURE;
197        }
198        if (*++argv == last) {
199            /* possibly leaking dest... */
200            break;
201        }
202        /* don't move up: dest may be == last and not malloced! */
203        free((void*)dest);
204    }
205
206    /* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */
207    return status;
208}
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