1 /* $OpenBSD: lndir.c,v 1.24 2020/03/06 15:17:05 mestre 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
main(int argc,char * argv[])83 main(int argc, char *argv[])
84 {
85 struct stat fs, ts;
86 char *fn, *tn;
87
88 if (pledge("stdio rpath 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) == -1)
122 err(1, "%s", tn);
123 if (!(S_ISDIR(ts.st_mode)))
124 errc(2, ENOTDIR, "%s", tn);
125 if (chdir(tn) == -1)
126 err(1, "%s", tn);
127
128 /* from directory */
129 if (stat(fn, &fs) == -1)
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
equivalent(char * lname,char * rname)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
addexcept(char * name)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
dodir(char * fn,struct stat * fs,struct stat * ts,int rel)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) == -1) {
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) == -1 &&
251 errno == ENOENT) {
252 if (mkdir(dp->d_name, 0777) == -1 ||
253 stat(dp->d_name, &sc) == -1) {
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) == -1) {
269 warn("%s", dp->d_name);
270 curdir = rcurdir = ocurdir;
271 continue;
272 }
273 dodir(buf, &sb, &sc, (buf[0] != '/'));
274 if (chdir("..") == -1)
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) == -1)
310 warn("%s", dp->d_name);
311 }
312 next:
313 ;
314 }
315
316 closedir(df);
317 return (0);
318 }
319
320 void
usage(void)321 usage(void)
322 {
323 fprintf(stderr, "usage: %s [-is] [-e exceptfile] fromdir [todir]\n",
324 __progname);
325 exit(1);
326 }
327