busybox/coreutils/cp.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

230 lines
6.7 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini cp 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.
*/
//config:config CP
//config: bool "cp"
//config: default y
//config: help
//config: cp is used to copy files and directories.
//config:
//config:config FEATURE_CP_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on CP && LONG_OPTS
//config: help
//config: Enable long options.
//config: Also add support for --parents option.
//applet:IF_CP(APPLET_NOEXEC(cp, cp, BB_DIR_BIN, BB_SUID_DROP, cp))
//kbuild:lib-$(CONFIG_CP) += cp.o
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */
//usage:#define cp_trivial_usage
//usage: "[OPTIONS] SOURCE... DEST"
//usage:#define cp_full_usage "\n\n"
//usage: "Copy SOURCE(s) to DEST\n"
//usage: "\n -a Same as -dpR"
//usage: IF_SELINUX(
//usage: "\n -c Preserve security context"
//usage: )
//usage: "\n -R,-r Recurse"
//usage: "\n -d,-P Preserve symlinks (default if -R)"
//usage: "\n -L Follow all symlinks"
//usage: "\n -H Follow symlinks on command line"
//usage: "\n -p Preserve file attributes if possible"
//usage: "\n -f Overwrite"
//usage: "\n -i Prompt before overwrite"
//usage: "\n -l,-s Create (sym)links"
//usage: "\n -u Copy only newer files"
#include "libbb.h"
#include "libcoreutils/coreutils.h"
/* This is a NOEXEC applet. Be very careful! */
int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cp_main(int argc, char **argv)
{
struct stat source_stat;
struct stat dest_stat;
const char *last;
const char *dest;
int s_flags;
int d_flags;
int flags;
int status;
enum {
FILEUTILS_CP_OPTNUM = sizeof(FILEUTILS_CP_OPTSTR)-1,
#if ENABLE_FEATURE_CP_LONG_OPTIONS
/*OPT_rmdest = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTNUM */
OPT_parents = 1 << (FILEUTILS_CP_OPTNUM+1),
#endif
};
// Need at least two arguments
// Soft- and hardlinking doesn't mix
// -P and -d are the same (-P is POSIX, -d is GNU)
// -r and -R are the same
// -R (and therefore -r) turns on -d (coreutils does this)
// -a = -pdR
opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
#if ENABLE_FEATURE_CP_LONG_OPTIONS
applet_long_options =
"archive\0" No_argument "a"
"force\0" No_argument "f"
"interactive\0" No_argument "i"
"link\0" No_argument "l"
"dereference\0" No_argument "L"
"no-dereference\0" No_argument "P"
"recursive\0" No_argument "R"
"symbolic-link\0" No_argument "s"
"verbose\0" No_argument "v"
"update\0" No_argument "u"
"remove-destination\0" No_argument "\xff"
"parents\0" No_argument "\xfe"
;
#endif
flags = getopt32(argv, FILEUTILS_CP_OPTSTR);
/* Options of cp from GNU coreutils 6.10:
* -a, --archive
* -f, --force
* -i, --interactive
* -l, --link
* -L, --dereference
* -P, --no-dereference
* -R, -r, --recursive
* -s, --symbolic-link
* -v, --verbose
* -H follow command-line symbolic links in SOURCE
* -d same as --no-dereference --preserve=links
* -p same as --preserve=mode,ownership,timestamps
* -c same as --preserve=context
* -u, --update
* copy only when the SOURCE file is newer than the destination
* file or when the destination file is missing
* --remove-destination
* remove each existing destination file before attempting to open
* --parents
* use full source file name under DIRECTORY
* NOT SUPPORTED IN BBOX:
* --backup[=CONTROL]
* make a backup of each existing destination file
* -b like --backup but does not accept an argument
* --copy-contents
* copy contents of special files when recursive
* --preserve[=ATTR_LIST]
* preserve attributes (default: mode,ownership,timestamps),
* if possible additional attributes: security context,links,all
* --no-preserve=ATTR_LIST
* --sparse=WHEN
* control creation of sparse files
* --strip-trailing-slashes
* remove any trailing slashes from each SOURCE argument
* -S, --suffix=SUFFIX
* override the usual backup suffix
* -t, --target-directory=DIRECTORY
* copy all SOURCE arguments into DIRECTORY
* -T, --no-target-directory
* treat DEST as a normal file
* -x, --one-file-system
* stay on this file system
* -Z, --context=CONTEXT
* (SELinux) set SELinux security context of copy to CONTEXT
*/
argc -= optind;
argv += optind;
/* Reverse this bit. If there is -d, bit is not set: */
flags ^= FILEUTILS_DEREFERENCE;
/* coreutils 6.9 compat:
* by default, "cp" derefs symlinks (creates regular dest files),
* but "cp -R" does not. We switch off deref if -r or -R (see above).
* However, "cp -RL" must still deref symlinks: */
if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */
flags |= FILEUTILS_DEREFERENCE;
#if ENABLE_SELINUX
if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) {
selinux_or_die();
}
#endif
status = EXIT_SUCCESS;
last = argv[argc - 1];
/* If there are only two arguments and... */
if (argc == 2) {
s_flags = cp_mv_stat2(*argv, &source_stat,
(flags & FILEUTILS_DEREFERENCE) ? stat : lstat);
if (s_flags < 0)
return EXIT_FAILURE;
d_flags = cp_mv_stat(last, &dest_stat);
if (d_flags < 0)
return EXIT_FAILURE;
#if ENABLE_FEATURE_CP_LONG_OPTIONS
//bb_error_msg("flags:%x FILEUTILS_RMDEST:%x OPT_parents:%x",
// flags, FILEUTILS_RMDEST, OPT_parents);
if (flags & OPT_parents) {
if (!(d_flags & 2)) {
bb_error_msg_and_die("with --parents, the destination must be a directory");
}
}
if (flags & FILEUTILS_RMDEST) {
flags |= FILEUTILS_FORCE;
}
#endif
/* ...if neither is a directory... */
if (!((s_flags | d_flags) & 2)
/* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */
|| ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags)
) {
/* Do a simple copy */
dest = last;
goto DO_COPY; /* NB: argc==2 -> *++argv==last */
}
}
while (1) {
#if ENABLE_FEATURE_CP_LONG_OPTIONS
if (flags & OPT_parents) {
char *dest_dup;
char *dest_dir;
dest = concat_path_file(last, *argv);
dest_dup = xstrdup(dest);
dest_dir = dirname(dest_dup);
if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) {
return EXIT_FAILURE;
}
free(dest_dup);
goto DO_COPY;
}
#endif
dest = concat_path_file(last, bb_get_last_path_component_strip(*argv));
DO_COPY:
if (copy_file(*argv, dest, flags) < 0) {
status = EXIT_FAILURE;
}
if (*++argv == last) {
/* possibly leaking dest... */
break;
}
/* don't move up: dest may be == last and not malloced! */
free((void*)dest);
}
/* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */
return status;
}