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82996175 KM |
1 | /*- |
2 | * Copyright (c) 1992 Keith Muller. | |
3 | * Copyright (c) 1992 The Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * Keith Muller of the University of California, San Diego. | |
8 | * | |
9 | * %sccs.include.redist.c% | |
10 | */ | |
11 | ||
12 | #ifndef lint | |
13 | static char sccsid[] = "@(#)ftree.c 1.1 (Berkeley) %G%"; | |
14 | #endif /* not lint */ | |
15 | ||
16 | #include <sys/types.h> | |
17 | #include <sys/time.h> | |
18 | #include <sys/stat.h> | |
19 | #include <sys/param.h> | |
20 | #include <unistd.h> | |
21 | #include <string.h> | |
22 | #include <stdio.h> | |
23 | #include <ctype.h> | |
24 | #include <errno.h> | |
25 | #include <stdlib.h> | |
26 | #include <fts.h> | |
27 | #include "pax.h" | |
28 | #include "ftree.h" | |
29 | #include "extern.h" | |
30 | ||
31 | /* | |
32 | * routines to interface with the fts library function. | |
33 | * | |
34 | * file args supplied to pax are stored on a single linked list (of type FTREE) | |
35 | * and given to fts to be processed one at a time. pax "selects" files from | |
36 | * the expansion of each arg into the corresponding file tree (if the arg is a | |
37 | * directory, otherwise the node itself is just passed to pax). The selection | |
38 | * is modified by the -n and -u flags. The user is informed when a specific | |
39 | * file arg does not generate any selected files. -n keeps expanding the file | |
40 | * tree arg until one of its files is selected, then skips to the next file | |
41 | * arg. when the user does not supply the file trees as command line args to | |
42 | * pax, they are read from stdin | |
43 | */ | |
44 | ||
45 | static FTS *ftsp = NULL; /* curent FTS handle */ | |
46 | static int ftsopts; /* options to be used on fts_open */ | |
47 | static char *farray[2]; /* array for passing each arg to fts */ | |
48 | static FTREE *fthead = NULL; /* head of linked list of file args */ | |
49 | static FTREE *fttail = NULL; /* tail of linked list of file args */ | |
50 | static FTREE *ftcur = NULL; /* current file arg being processed */ | |
51 | static FTSENT *ftent = NULL; /* current file tree entry */ | |
52 | static int refcnt = 1; /* ref count for stdin supplied arg */ | |
53 | static int ftree_skip; /* when set skip to next file arg */ | |
54 | ||
55 | static int ftree_arg __P((void)); | |
56 | ||
57 | /* | |
58 | * ftree_start() | |
59 | * initialize the options passed to fts_open() during this run of pax | |
60 | * options are based on the selection of pax options by the user | |
61 | * fts_start() also calls fts_arg() to open the first valid file arg. We | |
62 | * also attempt to reset directory access times when -t (tflag) is set. | |
63 | * Return: | |
64 | * 0 if there is at least one valid file arg to process, -1 otherwise | |
65 | */ | |
66 | ||
67 | #if __STDC__ | |
68 | int | |
69 | ftree_start(void) | |
70 | #else | |
71 | int | |
72 | ftree_start() | |
73 | #endif | |
74 | { | |
75 | /* | |
76 | * set up the operation mode of fts, open the first file arg. We must | |
77 | * use FTS_NOCHDIR, as the user may have to open multiple archives and | |
78 | * if fts did a chdir off into the boondocks, we may create an archive | |
79 | * volume in an place where the user did not expect to. | |
80 | */ | |
81 | ftsopts = FTS_NOCHDIR; | |
82 | ||
83 | /* | |
84 | * optional user flags that effect file traversal | |
85 | * -H command line symlink follow only | |
86 | * -L follow sylinks | |
87 | * -X do not cross over mount points | |
88 | * -t preserve access times on files read. | |
89 | * -n select only the first member of a file tree when a match is found | |
90 | * -d do not extract subtrees rooted at a directory arg. | |
91 | */ | |
92 | if (Lflag) | |
93 | ftsopts |= FTS_LOGICAL; | |
94 | else | |
95 | ftsopts |= FTS_PHYSICAL; | |
96 | if (Hflag) | |
97 | # ifdef NET2_FTS | |
98 | warn(0, "The -H flag is not supported on this version"); | |
99 | # else | |
100 | ftsopts |= FTS_COMFOLLOW; | |
101 | # endif | |
102 | if (Xflag) | |
103 | ftsopts |= FTS_XDEV; | |
104 | ||
105 | if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { | |
106 | warn(1, "Unable to allocate memory for file name buffer"); | |
107 | return(-1); | |
108 | } | |
109 | ||
110 | if (ftree_arg() < 0) | |
111 | return(-1); | |
112 | if (tflag && (atdir_start() < 0)) | |
113 | return(-1); | |
114 | return(0); | |
115 | } | |
116 | ||
117 | /* | |
118 | * ftree_add() | |
119 | * add the arg to the linked list of files to process. Each will be | |
120 | * processed by fts one at a time | |
121 | * Return: | |
122 | * 0 if added to the linked list, -1 if failed | |
123 | */ | |
124 | ||
125 | #if __STDC__ | |
126 | int | |
127 | ftree_add(register char *str) | |
128 | #else | |
129 | int | |
130 | ftree_add(str) | |
131 | register char *str; | |
132 | #endif | |
133 | { | |
134 | register FTREE *ft; | |
135 | register int len; | |
136 | ||
137 | /* | |
138 | * simple check for bad args | |
139 | */ | |
140 | if ((str == NULL) || (*str == '\0')) { | |
141 | warn(0, "Invalid file name arguement"); | |
142 | return(-1); | |
143 | } | |
144 | ||
145 | /* | |
146 | * allocate FTREE node and add to the end of the linked list (args are | |
147 | * processed in the same order they were passed to pax). Get rid of any | |
148 | * trailing / the user may pass us. (watch out for / by itself). | |
149 | */ | |
150 | if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { | |
151 | warn(0, "Unable to allocate memory for filename"); | |
152 | return(-1); | |
153 | } | |
154 | ||
155 | if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) | |
156 | str[len] = '\0'; | |
157 | ft->fname = str; | |
158 | ft->refcnt = 0; | |
159 | ft->fow = NULL; | |
160 | if (fthead == NULL) { | |
161 | fttail = fthead = ft; | |
162 | return(0); | |
163 | } | |
164 | fttail->fow = ft; | |
165 | fttail = ft; | |
166 | return(0); | |
167 | } | |
168 | ||
169 | /* | |
170 | * ftree_sel() | |
171 | * this entry has been selected by pax. bump up reference count and handle | |
172 | * -n and -d processing. | |
173 | */ | |
174 | ||
175 | #if __STDC__ | |
176 | void | |
177 | ftree_sel(register ARCHD *arcn) | |
178 | #else | |
179 | void | |
180 | ftree_sel(arcn) | |
181 | register ARCHD *arcn; | |
182 | #endif | |
183 | { | |
184 | /* | |
185 | * set reference bit for this pattern. This linked list is only used | |
186 | * when files trees are supplied pax as args. The list is not used when | |
187 | * the trees are read from stdin. stdin processing uses a global | |
188 | * reference count for the last path input. | |
189 | */ | |
190 | if (ftcur != NULL) | |
191 | ftcur->refcnt = 1; | |
192 | else | |
193 | refcnt = 1; | |
194 | ||
195 | /* | |
196 | * if -n we are done with this arg, force a skip to the next arg when | |
197 | * pax asks for the next file in next_file(). | |
198 | * if -d we tell fts only to match the directory (if the arg is a dir) | |
199 | * and not the entire file tree rooted at that point. | |
200 | */ | |
201 | if (nflag) | |
202 | ftree_skip = 1; | |
203 | ||
204 | if (!dflag || (arcn->type != PAX_DIR)) | |
205 | return; | |
206 | if (ftent != NULL) | |
207 | (void)fts_set(ftsp, ftent, FTS_SKIP); | |
208 | } | |
209 | ||
210 | /* | |
211 | * ftree_chk() | |
212 | * called at end on pax execution. Prints all those file args that did not | |
213 | * have a selected member (reference count still 0) | |
214 | */ | |
215 | ||
216 | #if __STDC__ | |
217 | void | |
218 | ftree_chk(void) | |
219 | #else | |
220 | void | |
221 | ftree_chk() | |
222 | #endif | |
223 | { | |
224 | register FTREE *ft; | |
225 | register int wban = 0; | |
226 | ||
227 | /* | |
228 | * make sure all dir access times were reset. | |
229 | */ | |
230 | if (tflag) | |
231 | atdir_end(); | |
232 | ||
233 | /* | |
234 | * walk down list and check reference count. Print out those members | |
235 | * that never had a match | |
236 | */ | |
237 | for (ft = fthead; ft != NULL; ft = ft->fow) { | |
238 | if (ft->refcnt > 0) | |
239 | continue; | |
240 | if (wban == 0) { | |
241 | warn(1,"WARNING! These file names were not selected:"); | |
242 | ++wban; | |
243 | } | |
244 | (void)fprintf(stderr, "%s\n", ft->fname); | |
245 | } | |
246 | } | |
247 | ||
248 | /* | |
249 | * ftree_arg() | |
250 | * Get the next file arg for fts to process. Can be from either the linked | |
251 | * list or read from stdin when the user did not them as args to pax. Each | |
252 | * arg is processed until the first successful fts_open(). | |
253 | * Return: | |
254 | * 0 when the next arg is ready to go, -1 if out of file args (or EOF on | |
255 | * stdin). | |
256 | */ | |
257 | ||
258 | #if __STDC__ | |
259 | static int | |
260 | ftree_arg(void) | |
261 | #else | |
262 | static int | |
263 | ftree_arg() | |
264 | #endif | |
265 | { | |
266 | register char *pt; | |
267 | ||
268 | /* | |
269 | * close off the current file tree | |
270 | */ | |
271 | if (ftsp != NULL) { | |
272 | (void)fts_close(ftsp); | |
273 | ftsp = NULL; | |
274 | } | |
275 | /* | |
276 | * keep looping until we get a valid file tree to process. Stop when we | |
277 | * reach the end of the list (or get an eof on stdin) | |
278 | */ | |
279 | for(;;) { | |
280 | if (fthead == NULL) { | |
281 | /* | |
282 | * the user didn't supply any args, get the file trees | |
283 | * to process from stdin; if the refenece count is 0 | |
284 | * complain that the last stdin read file tree did not | |
285 | * supply any selected members | |
286 | */ | |
287 | refcnt = 0; | |
288 | if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) | |
289 | return(-1); | |
290 | if ((pt = strchr(farray[0], '\n')) != NULL) | |
291 | *pt = '\0'; | |
292 | } else { | |
293 | /* | |
294 | * the user supplied the file args as arguements to pax | |
295 | * store the current reference count (unless we have not | |
296 | * processed any files yet). | |
297 | */ | |
298 | if (ftcur != NULL) { | |
299 | ftcur->refcnt = refcnt; | |
300 | if ((ftcur = ftcur->fow) == NULL) | |
301 | return(-1); | |
302 | } else | |
303 | ftcur = fthead; | |
304 | farray[0] = ftcur->fname; | |
305 | } | |
306 | ||
307 | /* | |
308 | * watch it, fts wants the file arg stored in a array of char | |
309 | * ptrs, with the last one a null. we use a two element array | |
310 | * and set farray[0] to point at the buffer with the file name | |
311 | * in it. We cannnot pass all the file args to fts at one shot | |
312 | * as we need to keep a handle on which file arg generates what | |
313 | * files (the -n and -d flags need this). If the open is | |
314 | * successful, return a 0. | |
315 | */ | |
316 | if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) | |
317 | break; | |
318 | } | |
319 | return(0); | |
320 | } | |
321 | ||
322 | /* | |
323 | * next_file() | |
324 | * supplies the next file to process in the supplied archd structure. | |
325 | * Return: | |
326 | * 0 when contents of arcn have been set with the next file, -1 when done. | |
327 | */ | |
328 | ||
329 | #if __STDC__ | |
330 | int | |
331 | next_file(register ARCHD *arcn) | |
332 | #else | |
333 | int | |
334 | next_file(arcn) | |
335 | register ARCHD *arcn; | |
336 | #endif | |
337 | { | |
338 | register int cnt; | |
339 | time_t atime; | |
340 | time_t mtime; | |
341 | ||
342 | /* | |
343 | * ftree_sel() might have set the ftree_skip flag if the user has the | |
344 | * -n option and a file was selected from this file arg tree. (-n says | |
345 | * only one member is matched for each pattern) ftree_skip being 1 | |
346 | ( forces us to go to the next arg now. | |
347 | */ | |
348 | if (ftree_skip) { | |
349 | /* | |
350 | * clear and go to next arg | |
351 | */ | |
352 | ftree_skip = 0; | |
353 | if (ftree_arg() < 0) | |
354 | return(-1); | |
355 | } | |
356 | ||
357 | /* | |
358 | * loop until we get a valid file to process | |
359 | */ | |
360 | for(;;) { | |
361 | if ((ftent = fts_read(ftsp)) == NULL) { | |
362 | /* | |
363 | * out of files in this tree, go to next arg, if none | |
364 | * we are done | |
365 | */ | |
366 | if (ftree_arg() < 0) | |
367 | return(-1); | |
368 | continue; | |
369 | } | |
370 | ||
371 | /* | |
372 | * handle each type of fts_read() flag | |
373 | */ | |
374 | switch(ftent->fts_info) { | |
375 | case FTS_D: | |
376 | case FTS_DEFAULT: | |
377 | case FTS_F: | |
378 | case FTS_SL: | |
379 | case FTS_SLNONE: | |
380 | /* | |
381 | * these are all ok | |
382 | */ | |
383 | break; | |
384 | case FTS_DP: | |
385 | /* | |
386 | * already saw this directory. If the user wants file | |
387 | * access times reset, we use this to restore the | |
388 | * access time for this directory since this is the | |
389 | * last time we will see it in this file subtree | |
390 | * remember to force the time (this is -t on a read | |
391 | * directory, not a created directory). | |
392 | */ | |
393 | # ifdef NET2_FTS | |
394 | if (!tflag || (get_atdir(ftent->fts_statb.st_dev, | |
395 | ftent->fts_statb.st_ino, &mtime, &atime) < 0)) | |
396 | # else | |
397 | if (!tflag || (get_atdir(ftent->fts_statp->st_dev, | |
398 | ftent->fts_statp->st_ino, &mtime, &atime) < 0)) | |
399 | # endif | |
400 | continue; | |
401 | set_ftime(ftent->fts_path, mtime, atime, 1); | |
402 | continue; | |
403 | case FTS_DC: | |
404 | /* | |
405 | * fts claims a file system cycle | |
406 | */ | |
407 | warn(1,"File system cycle found at %s",ftent->fts_path); | |
408 | continue; | |
409 | case FTS_DNR: | |
410 | # ifdef NET2_FTS | |
411 | syswarn(1, errno, | |
412 | # else | |
413 | syswarn(1, ftent->fts_errno, | |
414 | # endif | |
415 | "Unable to read directory %s", ftent->fts_path); | |
416 | continue; | |
417 | case FTS_ERR: | |
418 | # ifdef NET2_FTS | |
419 | syswarn(1, errno, | |
420 | # else | |
421 | syswarn(1, ftent->fts_errno, | |
422 | # endif | |
423 | "File system traversal error"); | |
424 | continue; | |
425 | case FTS_NS: | |
426 | case FTS_NSOK: | |
427 | # ifdef NET2_FTS | |
428 | syswarn(1, errno, | |
429 | # else | |
430 | syswarn(1, ftent->fts_errno, | |
431 | # endif | |
432 | "Unable to access %s", ftent->fts_path); | |
433 | continue; | |
434 | } | |
435 | ||
436 | /* | |
437 | * ok got a file tree node to process. copy info into arcn | |
438 | * structure (initialize as required) | |
439 | */ | |
440 | arcn->skip = 0; | |
441 | arcn->pad = 0; | |
442 | arcn->ln_nlen = 0; | |
443 | arcn->ln_name[0] = '\0'; | |
444 | # ifdef NET2_FTS | |
445 | arcn->sb = ftent->fts_statb; | |
446 | # else | |
447 | arcn->sb = *(ftent->fts_statp); | |
448 | # endif | |
449 | ||
450 | /* | |
451 | * file type based set up and copy into the arcn struct | |
452 | * SIDE NOTE: | |
453 | * we try to reset the access time on all files and directories | |
454 | * we may read when the -t flag is specified. files are reset | |
455 | * when we close them after copying. we reset the directories | |
456 | * when we are done with their file tree (we also clean up at | |
457 | * end in case we cut short a file tree traversal). However | |
458 | * there is no way to reset access times on symlinks. | |
459 | */ | |
460 | switch(S_IFMT & arcn->sb.st_mode) { | |
461 | case S_IFDIR: | |
462 | arcn->type = PAX_DIR; | |
463 | if (!tflag) | |
464 | break; | |
465 | add_atdir(ftent->fts_path, arcn->sb.st_dev, | |
466 | arcn->sb.st_ino, arcn->sb.st_mtime, | |
467 | arcn->sb.st_atime); | |
468 | break; | |
469 | case S_IFCHR: | |
470 | arcn->type = PAX_CHR; | |
471 | break; | |
472 | case S_IFBLK: | |
473 | arcn->type = PAX_BLK; | |
474 | break; | |
475 | case S_IFREG: | |
476 | /* | |
477 | * only regular files with have data to store on the | |
478 | * archive. all others will store a zero length skip. | |
479 | * the skip field is used by pax for actual data it has | |
480 | * to read (or skip over). | |
481 | */ | |
482 | arcn->type = PAX_REG; | |
483 | arcn->skip = arcn->sb.st_size; | |
484 | break; | |
485 | case S_IFLNK: | |
486 | arcn->type = PAX_SLK; | |
487 | /* | |
488 | * have to read the symlink path from the file | |
489 | */ | |
490 | if ((cnt = readlink(ftent->fts_path, arcn->ln_name, | |
491 | PAXPATHLEN)) < 0) { | |
492 | syswarn(1, errno, "Unable to read symlink %s", | |
493 | ftent->fts_path); | |
494 | continue; | |
495 | } | |
496 | /* | |
497 | * set link name length, watch out readlink does not | |
498 | * allways null terminate the link path | |
499 | */ | |
500 | arcn->ln_name[cnt] = '\0'; | |
501 | arcn->ln_nlen = cnt; | |
502 | break; | |
503 | case S_IFSOCK: | |
504 | /* | |
505 | * under BSD storing a socket is senseless but we will | |
506 | * let the format specific write function make the | |
507 | * decision of what to do with it. | |
508 | */ | |
509 | arcn->type = PAX_SCK; | |
510 | break; | |
511 | case S_IFIFO: | |
512 | arcn->type = PAX_FIF; | |
513 | break; | |
514 | } | |
515 | break; | |
516 | } | |
517 | ||
518 | /* | |
519 | * copy file name, set file name length | |
520 | */ | |
521 | arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, PAXPATHLEN+1); | |
522 | arcn->org_name = ftent->fts_path; | |
523 | return(0); | |
524 | } |