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a40f0624db
function old new delta copy_file 1495 1518 +23 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
192 lines
5.5 KiB
C
192 lines
5.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini cp implementation for busybox
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*
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* Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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* SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp>
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*
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* Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
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*/
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Size reduction.
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*/
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#include "libbb.h"
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#include "libcoreutils/coreutils.h"
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/* This is a NOEXEC applet. Be very careful! */
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int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int cp_main(int argc, char **argv)
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{
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struct stat source_stat;
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struct stat dest_stat;
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const char *last;
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const char *dest;
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int s_flags;
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int d_flags;
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int flags;
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int status;
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enum {
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OPT_a = 1 << (sizeof(FILEUTILS_CP_OPTSTR)-1),
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OPT_r = 1 << (sizeof(FILEUTILS_CP_OPTSTR)),
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OPT_P = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+1),
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OPT_v = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+2),
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#if ENABLE_FEATURE_CP_LONG_OPTIONS
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OPT_parents = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+3),
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#endif
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};
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// Need at least two arguments
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// Soft- and hardlinking doesn't mix
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// -P and -d are the same (-P is POSIX, -d is GNU)
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// -r and -R are the same
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// -R (and therefore -r) turns on -d (coreutils does this)
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// -a = -pdR
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opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
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#if ENABLE_FEATURE_CP_LONG_OPTIONS
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applet_long_options =
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"archive\0" No_argument "a"
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"force\0" No_argument "f"
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"interactive\0" No_argument "i"
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"link\0" No_argument "l"
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"dereference\0" No_argument "L"
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"no-dereference\0" No_argument "P"
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"recursive\0" No_argument "R"
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"symbolic-link\0" No_argument "s"
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"verbose\0" No_argument "v"
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"parents\0" No_argument "\xff"
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;
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#endif
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// -v (--verbose) is ignored
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flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPv");
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/* Options of cp from GNU coreutils 6.10:
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* -a, --archive
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* -f, --force
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* -i, --interactive
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* -l, --link
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* -L, --dereference
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* -P, --no-dereference
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* -R, -r, --recursive
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* -s, --symbolic-link
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* -v, --verbose
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* -H follow command-line symbolic links in SOURCE
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* -d same as --no-dereference --preserve=links
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* -p same as --preserve=mode,ownership,timestamps
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* -c same as --preserve=context
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* --parents
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* use full source file name under DIRECTORY
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* NOT SUPPORTED IN BBOX:
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* --backup[=CONTROL]
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* make a backup of each existing destination file
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* -b like --backup but does not accept an argument
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* --copy-contents
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* copy contents of special files when recursive
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* --preserve[=ATTR_LIST]
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* preserve attributes (default: mode,ownership,timestamps),
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* if possible additional attributes: security context,links,all
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* --no-preserve=ATTR_LIST
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* --remove-destination
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* remove each existing destination file before attempting to open
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* --sparse=WHEN
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* control creation of sparse files
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* --strip-trailing-slashes
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* remove any trailing slashes from each SOURCE argument
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* -S, --suffix=SUFFIX
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* override the usual backup suffix
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* -t, --target-directory=DIRECTORY
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* copy all SOURCE arguments into DIRECTORY
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* -T, --no-target-directory
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* treat DEST as a normal file
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* -u, --update
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* copy only when the SOURCE file is newer than the destination
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* file or when the destination file is missing
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* -x, --one-file-system
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* stay on this file system
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* -Z, --context=CONTEXT
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* (SELinux) set SELinux security context of copy to CONTEXT
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*/
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argc -= optind;
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argv += optind;
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/* Reverse this bit. If there is -d, bit is not set: */
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flags ^= FILEUTILS_DEREFERENCE;
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/* coreutils 6.9 compat:
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* by default, "cp" derefs symlinks (creates regular dest files),
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* but "cp -R" does not. We switch off deref if -r or -R (see above).
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* However, "cp -RL" must still deref symlinks: */
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if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */
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flags |= FILEUTILS_DEREFERENCE;
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#if ENABLE_SELINUX
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if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) {
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selinux_or_die();
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}
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#endif
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status = EXIT_SUCCESS;
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last = argv[argc - 1];
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/* If there are only two arguments and... */
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if (argc == 2) {
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s_flags = cp_mv_stat2(*argv, &source_stat,
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(flags & FILEUTILS_DEREFERENCE) ? stat : lstat);
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if (s_flags < 0)
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return EXIT_FAILURE;
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d_flags = cp_mv_stat(last, &dest_stat);
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if (d_flags < 0)
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return EXIT_FAILURE;
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#if ENABLE_FEATURE_CP_LONG_OPTIONS
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if (flags & OPT_parents) {
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if (!(d_flags & 2)) {
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bb_error_msg_and_die("with --parents, the destination must be a directory");
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}
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}
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#endif
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/* ...if neither is a directory... */
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if (!((s_flags | d_flags) & 2)
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/* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */
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|| ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags)
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) {
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/* Do a simple copy */
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dest = last;
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goto DO_COPY; /* NB: argc==2 -> *++argv==last */
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}
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}
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while (1) {
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#if ENABLE_FEATURE_CP_LONG_OPTIONS
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if (flags & OPT_parents) {
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char *dest_dup;
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char *dest_dir;
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dest = concat_path_file(last, *argv);
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dest_dup = xstrdup(dest);
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dest_dir = dirname(dest_dup);
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if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) {
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return EXIT_FAILURE;
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}
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free(dest_dup);
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goto DO_COPY;
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}
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#endif
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dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
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DO_COPY:
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if (copy_file(*argv, dest, flags) < 0) {
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status = EXIT_FAILURE;
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}
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if (*++argv == last) {
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/* possibly leaking dest... */
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break;
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}
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/* don't move up: dest may be == last and not malloced! */
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free((void*)dest);
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}
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/* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */
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return status;
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}
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