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