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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) 11 * 12 * Size reduction. 13 */ 14//config:config CP 15//config: bool "cp (10 kb)" 16//config: default y 17//config: help 18//config: cp is used to copy files and directories. 19//config: 20//config:config FEATURE_CP_LONG_OPTIONS 21//config: bool "Enable long options" 22//config: default y 23//config: depends on CP && LONG_OPTS 24//config: help 25//config: Enable long options. 26//config: Also add support for --parents option. 27//config: 28//config:config FEATURE_CP_REFLINK 29//config: bool "Enable --reflink[=auto]" 30//config: default y 31//config: depends on FEATURE_CP_LONG_OPTIONS 32 33//applet:IF_CP(APPLET_NOEXEC(cp, cp, BB_DIR_BIN, BB_SUID_DROP, cp)) 34/* NOEXEC despite cases when it can be a "runner" (cp -r LARGE_DIR NEW_DIR) */ 35 36//kbuild:lib-$(CONFIG_CP) += cp.o 37 38/* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */ 39 40// Options of cp from GNU coreutils 6.10: 41// -a, --archive 42// -f, --force 43// -i, --interactive 44// -l, --link 45// -L, --dereference 46// -P, --no-dereference 47// -R, -r, --recursive 48// -s, --symbolic-link 49// -v, --verbose 50// -H follow command-line symbolic links in SOURCE 51// -d same as --no-dereference --preserve=links 52// -p same as --preserve=mode,ownership,timestamps 53// -c same as --preserve=context 54// -u, --update 55// copy only when the SOURCE file is newer than the destination 56// file or when the destination file is missing 57// --remove-destination 58// remove each existing destination file before attempting to open 59// --parents 60// use full source file name under DIRECTORY 61// -T, --no-target-directory 62// treat DEST as a normal file 63// NOT SUPPORTED IN BBOX: 64// --backup[=CONTROL] 65// make a backup of each existing destination file 66// -b like --backup but does not accept an argument 67// --copy-contents 68// copy contents of special files when recursive 69// --preserve[=ATTR_LIST] 70// preserve attributes (default: mode,ownership,timestamps), 71// if possible additional attributes: security context,links,all 72// --no-preserve=ATTR_LIST 73// --sparse=WHEN 74// control creation of sparse files 75// --strip-trailing-slashes 76// remove any trailing slashes from each SOURCE argument 77// -S, --suffix=SUFFIX 78// override the usual backup suffix 79// -t, --target-directory=DIRECTORY 80// copy all SOURCE arguments into DIRECTORY 81// -x, --one-file-system 82// stay on this file system 83// -Z, --context=CONTEXT 84// (SELinux) set SELinux security context of copy to CONTEXT 85 86//usage:#define cp_trivial_usage 87//usage: "[-arPLHpfinlsTu] SOURCE DEST\n" 88//usage: "or: cp [-arPLHpfinlsu] SOURCE... { -t DIRECTORY | DIRECTORY }" 89//usage:#define cp_full_usage "\n\n" 90//usage: "Copy SOURCEs to DEST\n" 91//usage: "\n -a Same as -dpR" 92//usage: IF_SELINUX( 93//usage: "\n -c Preserve security context" 94//usage: ) 95//usage: "\n -R,-r Recurse" 96//usage: "\n -d,-P Preserve symlinks (default if -R)" 97//usage: "\n -L Follow all symlinks" 98//usage: "\n -H Follow symlinks on command line" 99//usage: "\n -p Preserve file attributes if possible" 100//usage: "\n -f Overwrite" 101//usage: "\n -i Prompt before overwrite" 102//usage: "\n -n Don't overwrite" 103//usage: "\n -l,-s Create (sym)links" 104//usage: "\n -T Refuse to copy if DEST is a directory" 105//usage: "\n -t DIR Copy all SOURCEs into DIR" 106//usage: "\n -u Copy only newer files" 107 108#include "libbb.h" 109#include "libcoreutils/coreutils.h" 110 111/* This is a NOEXEC applet. Be very careful! */ 112 113int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 114int cp_main(int argc, char **argv) 115{ 116 struct stat source_stat; 117 struct stat dest_stat; 118 const char *last; 119 const char *dest; 120 int s_flags; 121 int d_flags; 122 int flags; 123 int status; 124#if ENABLE_FEATURE_CP_LONG_OPTIONS 125 enum { 126 /*OPT_rmdest = FILEUTILS_RMDEST = 1 << FILEUTILS_CP_OPTBITS */ 127 OPT_parents = 1 << (FILEUTILS_CP_OPTBITS+1), 128 OPT_reflink = 1 << (FILEUTILS_CP_OPTBITS+2), 129 }; 130# if ENABLE_FEATURE_CP_REFLINK 131 char *reflink = NULL; 132# endif 133 flags = getopt32long(argv, "^" 134 FILEUTILS_CP_OPTSTR 135 "\0" 136 // Need at least one argument. (Usually two+, but -t DIR can have only one) 137 // Soft- and hardlinking doesn't mix 138 // -P and -d are the same (-P is POSIX, -d is GNU) 139 // -r and -R are the same 140 // -R (and therefore -r) turns on -d (coreutils does this) 141 // -a = -pdR 142 // -i overrides -n and vice versa (last wins) 143 "-1:l--s:s--l:Pd:rRd:Rd:apdR:i-n:n-i", 144 "archive\0" No_argument "a" 145 "force\0" No_argument "f" 146 "interactive\0" No_argument "i" 147 "no-clobber\0" No_argument "n" 148 "link\0" No_argument "l" 149 "dereference\0" No_argument "L" 150 "no-dereference\0" No_argument "P" 151 "recursive\0" No_argument "R" 152 "symbolic-link\0" No_argument "s" 153 "no-target-directory\0" No_argument "T" 154 "target-directory\0" Required_argument "t" 155 "verbose\0" No_argument "v" 156 "update\0" No_argument "u" 157 "remove-destination\0" No_argument "\xff" 158 "parents\0" No_argument "\xfe" 159# if ENABLE_FEATURE_CP_REFLINK 160 "reflink\0" Optional_argument "\xfd" 161# endif 162 , &last 163# if ENABLE_FEATURE_CP_REFLINK 164 , &reflink 165# endif 166 ); 167# if ENABLE_FEATURE_CP_REFLINK 168 BUILD_BUG_ON((int)OPT_reflink != (int)FILEUTILS_REFLINK); 169 if (flags & FILEUTILS_REFLINK) { 170 if (!reflink) 171 flags |= FILEUTILS_REFLINK_ALWAYS; 172 else if (strcmp(reflink, "always") == 0) 173 flags |= FILEUTILS_REFLINK_ALWAYS; 174 else if (strcmp(reflink, "auto") != 0) 175 bb_show_usage(); 176 } 177# endif 178#else 179 flags = getopt32(argv, "^" 180 FILEUTILS_CP_OPTSTR 181 "\0" 182 "-1:l--s:s--l:Pd:rRd:Rd:apdR" 183 , &last 184 ); 185#endif 186 argc -= optind; 187 argv += optind; 188 /* Reverse this bit. If there is -d, bit is not set: */ 189 flags ^= FILEUTILS_DEREFERENCE; 190 /* coreutils 6.9 compat: 191 * by default, "cp" derefs symlinks (creates regular dest files), 192 * but "cp -R" does not. We switch off deref if -r or -R (see above). 193 * However, "cp -RL" must still deref symlinks: */ 194 if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */ 195 flags |= FILEUTILS_DEREFERENCE; 196 197#if ENABLE_SELINUX 198 if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) { 199 selinux_or_die(); 200 } 201#endif 202 203 status = EXIT_SUCCESS; 204 if (!(flags & FILEUTILS_TARGET_DIR)) { 205 last = argv[argc - 1]; 206 if (argc < 2) 207 bb_show_usage(); 208 if (argc != 2) { 209 if (flags & FILEUTILS_NO_TARGET_DIR) 210 bb_show_usage(); 211 /* "cp A B C... DIR" - target must be dir */ 212 } else /* argc == 2 */ { 213 /* "cp A B" - only case where target can be not a dir */ 214 s_flags = cp_mv_stat2(*argv, &source_stat, 215 (flags & FILEUTILS_DEREFERENCE) ? stat : lstat); 216 if (s_flags < 0) /* error other than ENOENT */ 217 return EXIT_FAILURE; 218 d_flags = cp_mv_stat(last, &dest_stat); 219 if (d_flags < 0) /* error other than ENOENT */ 220 return EXIT_FAILURE; 221 222 if (flags & FILEUTILS_NO_TARGET_DIR) { /* -T */ 223 if (!(s_flags & 2) && (d_flags & 2)) 224 /* cp -T NOTDIR DIR */ 225 bb_error_msg_and_die("'%s' is a directory", last); 226 } 227 228#if ENABLE_FEATURE_CP_LONG_OPTIONS 229 //bb_error_msg("flags:%x FILEUTILS_RMDEST:%x OPT_parents:%x", 230 // flags, FILEUTILS_RMDEST, OPT_parents); 231 if (flags & OPT_parents) { 232 if (!(d_flags & 2)) { 233 bb_simple_error_msg_and_die("with --parents, the destination must be a directory"); 234 } 235 } 236 if (flags & FILEUTILS_RMDEST) { 237 flags |= FILEUTILS_FORCE; 238 } 239#endif 240 241 /* ...if neither is a directory... */ 242 if (!((s_flags | d_flags) & 2) 243 /* ...or: recursing, the 1st is a directory, and the 2nd doesn't exist... */ 244 || ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags) 245 || (flags & FILEUTILS_NO_TARGET_DIR) 246 ) { 247 /* Do a simple copy */ 248 dest = last; 249 goto DO_COPY; /* NB: argc==2 -> *++argv==last */ 250 } 251 } 252 } 253 /* else: last is DIR from "-t DIR" */ 254 255 while (1) { 256#if ENABLE_FEATURE_CP_LONG_OPTIONS 257 if (flags & OPT_parents) { 258 char *dest_dup; 259 char *dest_dir; 260 dest = concat_path_file(last, *argv); 261 dest_dup = xstrdup(dest); 262 dest_dir = dirname(dest_dup); 263 if (bb_make_directory(dest_dir, -1, FILEUTILS_RECUR)) { 264 return EXIT_FAILURE; 265 } 266 free(dest_dup); 267 goto DO_COPY; 268 } 269#endif 270 dest = concat_path_file(last, bb_get_last_path_component_strip(*argv)); 271 DO_COPY: 272 if (copy_file(*argv, dest, flags) < 0) { 273 status = EXIT_FAILURE; 274 } 275 if (!*++argv || *argv == last) { 276 /* possibly leaking dest... */ 277 break; 278 } 279 /* don't move up: dest may be == last and not malloced! */ 280 free((void*)dest); 281 } 282 283 /* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */ 284 return status; 285} 286