1 /* $OpenBSD: lndir.c,v 1.22 2015/10/10 14:23:12 deraadt Exp $ */ 2 /* $XConsortium: lndir.c /main/15 1995/08/30 10:56:18 gildea $ */ 3 4 /* 5 * Create shadow link tree (after X11R4 script of the same name) 6 * Mark Reinhold (mbr@lcs.mit.edu)/3 January 1990 7 */ 8 9 /* 10 Copyright (c) 1990, X Consortium 11 12 Permission is hereby granted, free of charge, to any person obtaining a copy 13 of this software and associated documentation files (the "Software"), to deal 14 in the Software without restriction, including without limitation the rights 15 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 16 copies of the Software, and to permit persons to whom the Software is 17 furnished to do so, subject to the following conditions: 18 19 The above copyright notice and this permission notice shall be included in 20 all copies or substantial portions of the Software. 21 22 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 25 X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 26 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 27 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 28 29 Except as contained in this notice, the name of the X Consortium shall not be 30 used in advertising or otherwise to promote the sale, use or other dealings 31 in this Software without prior written authorization from the X Consortium. 32 33 */ 34 35 /* From the original /bin/sh script: 36 37 Used to create a copy of the a directory tree that has links for all 38 non-directories (except those named RCS, SCCS or CVS.adm). If you are 39 building the distribution on more than one machine, you should use 40 this technique. 41 42 If your master sources are located in /usr/local/src/X and you would like 43 your link tree to be in /usr/local/src/new-X, do the following: 44 45 % mkdir /usr/local/src/new-X 46 % cd /usr/local/src/new-X 47 % lndir ../X 48 */ 49 50 #include <sys/stat.h> 51 52 #include <dirent.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <stdarg.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <limits.h> 61 62 extern char *__progname; 63 64 int silent; /* -silent */ 65 int ignore_links; /* -ignorelinks */ 66 67 char *rcurdir; 68 char *curdir; 69 70 int equivalent(char *, char *); 71 void addexcept(char *); 72 int dodir(char *, struct stat *, struct stat *, int); 73 void usage(void); 74 75 struct except { 76 char *name; 77 struct except *next; 78 }; 79 80 struct except *exceptions; 81 82 int 83 main(int argc, char *argv[]) 84 { 85 struct stat fs, ts; 86 char *fn, *tn; 87 88 if (pledge("stdio rpath wpath cpath", NULL) == -1) 89 err(1, "pledge"); 90 91 while (++argv, --argc) { 92 if ((strcmp(*argv, "-silent") == 0) || 93 (strcmp(*argv, "-s") == 0)) 94 silent = 1; 95 else if ((strcmp(*argv, "-ignorelinks") == 0) || 96 (strcmp(*argv, "-i") == 0)) 97 ignore_links = 1; 98 else if (strcmp(*argv, "-e") == 0) { 99 ++argv, --argc; 100 101 if (argc < 2) 102 usage(); 103 addexcept(*argv); 104 } else if (strcmp(*argv, "--") == 0) { 105 ++argv, --argc; 106 break; 107 } else 108 break; 109 } 110 111 if (argc < 1 || argc > 2) 112 usage(); 113 114 fn = argv[0]; 115 if (argc == 2) 116 tn = argv[1]; 117 else 118 tn = "."; 119 120 /* to directory */ 121 if (stat(tn, &ts) < 0) 122 err(1, "%s", tn); 123 if (!(S_ISDIR(ts.st_mode))) 124 errc(2, ENOTDIR, "%s", tn); 125 if (chdir(tn) < 0) 126 err(1, "%s", tn); 127 128 /* from directory */ 129 if (stat(fn, &fs) < 0) 130 err(1, "%s", fn); 131 if (!(S_ISDIR(fs.st_mode))) 132 errc(2, ENOTDIR, "%s", fn); 133 134 exit(dodir(fn, &fs, &ts, 0)); 135 } 136 137 int 138 equivalent(char *lname, char *rname) 139 { 140 char *s, *ns; 141 142 if (strcmp(lname, rname) == 0) 143 return(1); 144 for (s = lname; *s && (s = strchr(s, '/')); s++) { 145 if (s[1] == '/') { 146 /* collapse multiple slashes in lname */ 147 for (ns = s + 1; *ns == '/'; ns++) 148 ; 149 memmove(s + 1, ns, strlen(ns) + 1); 150 } 151 } 152 return (strcmp(lname, rname) == 0); 153 } 154 155 void 156 addexcept(char *name) 157 { 158 struct except *new; 159 160 new = malloc(sizeof(struct except)); 161 if (new == NULL) 162 err(1, NULL); 163 new->name = strdup(name); 164 if (new->name == NULL) 165 err(1, NULL); 166 167 new->next = exceptions; 168 exceptions = new; 169 } 170 171 172 /* 173 * Recursively create symbolic links from the current directory to the "from" 174 * directory. Assumes that files described by fs and ts are directories. 175 */ 176 #if 0 177 char *fn; /* name of "from" directory, either absolute or 178 relative to cwd */ 179 struct stat *fs, *ts; /* stats for the "from" directory and cwd */ 180 int rel; /* if true, prepend "../" to fn before using */ 181 #endif 182 int 183 dodir(char *fn, struct stat *fs, struct stat *ts, int rel) 184 { 185 char buf[PATH_MAX + 1], symbuf[PATH_MAX + 1]; 186 char basesym[PATH_MAX + 1]; 187 int n_dirs, symlen, basesymlen = -1; 188 struct stat sb, sc; 189 struct except *cur; 190 struct dirent *dp; 191 char *ocurdir, *p; 192 DIR *df; 193 194 if (fs->st_dev == ts->st_dev && fs->st_ino == ts->st_ino) { 195 warnx("%s: From and to directories are identical!", fn); 196 return(1); 197 } 198 199 if (rel) 200 strlcpy(buf, "../", sizeof(buf)); 201 else 202 buf[0] = '\0'; 203 strlcat(buf, fn, sizeof(buf)); 204 205 if (!(df = opendir(buf))) { 206 warn("%s: Cannot opendir", buf); 207 return(1); 208 } 209 210 p = buf + strlen(buf); 211 *p++ = '/'; 212 n_dirs = fs->st_nlink; 213 while ((dp = readdir(df))) { 214 if (dp->d_namlen == 0 || dp->d_name[dp->d_namlen - 1] == '~' || 215 strncmp(dp->d_name, ".#", 2) == 0) 216 continue; 217 for (cur = exceptions; cur != NULL; cur = cur->next) { 218 if (!strcmp(dp->d_name, cur->name)) 219 goto next; /* can't continue */ 220 } 221 strlcpy(p, dp->d_name, buf + sizeof(buf) - p); 222 223 if (n_dirs > 0) { 224 if (stat(buf, &sb) < 0) { 225 warn("%s", buf); 226 continue; 227 } 228 229 if (S_ISDIR(sb.st_mode)) { 230 /* directory */ 231 n_dirs--; 232 if (dp->d_name[0] == '.' && 233 (dp->d_name[1] == '\0' || 234 (dp->d_name[1] == '.' && 235 dp->d_name[2] == '\0'))) 236 continue; 237 if (!strcmp(dp->d_name, "RCS")) 238 continue; 239 if (!strcmp(dp->d_name, "SCCS")) 240 continue; 241 if (!strcmp(dp->d_name, "CVS")) 242 continue; 243 if (!strcmp(dp->d_name, "CVS.adm")) 244 continue; 245 ocurdir = rcurdir; 246 rcurdir = buf; 247 curdir = silent ? buf : NULL; 248 if (!silent) 249 printf("%s:\n", buf); 250 if (stat(dp->d_name, &sc) < 0 && 251 errno == ENOENT) { 252 if (mkdir(dp->d_name, 0777) < 0 || 253 stat(dp->d_name, &sc) < 0) { 254 warn("%s", dp->d_name); 255 curdir = rcurdir = ocurdir; 256 continue; 257 } 258 } 259 if (readlink(dp->d_name, symbuf, 260 sizeof(symbuf) - 1) >= 0) { 261 fprintf(stderr, 262 "%s: is a link instead of a " 263 "directory\n", 264 dp->d_name); 265 curdir = rcurdir = ocurdir; 266 continue; 267 } 268 if (chdir(dp->d_name) < 0) { 269 warn("%s", dp->d_name); 270 curdir = rcurdir = ocurdir; 271 continue; 272 } 273 dodir(buf, &sb, &sc, (buf[0] != '/')); 274 if (chdir("..") < 0) 275 err(1, ".."); 276 curdir = rcurdir = ocurdir; 277 continue; 278 } 279 } 280 281 /* non-directory */ 282 symlen = readlink(dp->d_name, symbuf, sizeof(symbuf) - 1); 283 if (symlen >= 0) 284 symbuf[symlen] = '\0'; 285 286 /* 287 * The option to ignore links exists mostly because 288 * checking for them slows us down by 10-20%. 289 * But it is off by default because this is a useful check. 290 */ 291 if (!ignore_links) { 292 /* see if the file in the base tree was a symlink */ 293 basesymlen = readlink(buf, basesym, 294 sizeof(basesym) - 1); 295 if (basesymlen >= 0) 296 basesym[basesymlen] = '\0'; 297 } 298 299 if (symlen >= 0) { 300 /* 301 * Link exists in new tree. Print message if 302 * it doesn't match. 303 */ 304 if (!equivalent(basesymlen >= 0 ? basesym : buf, 305 symbuf)) 306 fprintf(stderr,"%s: %s\n", dp->d_name, symbuf); 307 } else { 308 if (symlink(basesymlen >= 0 ? basesym : buf, 309 dp->d_name) < 0) 310 warn("%s", dp->d_name); 311 } 312 next: 313 ; 314 } 315 316 closedir(df); 317 return (0); 318 } 319 320 void 321 usage(void) 322 { 323 fprintf(stderr, "usage: %s [-is] [-e exceptfile] fromdir [todir]\n", 324 __progname); 325 exit(1); 326 } 327