2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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37 * @(#)ftree.c 8.2 (Berkeley) 4/18/94
38 * $FreeBSD: src/bin/pax/ftree.c,v 1.13.2.1 2001/08/01 05:03:11 obrien Exp $
39 * $DragonFly: src/bin/pax/ftree.c,v 1.2 2003/06/17 04:22:50 dillon Exp $
42 #include <sys/types.h>
56 * routines to interface with the fts library function.
58 * file args supplied to pax are stored on a single linked list (of type FTREE)
59 * and given to fts to be processed one at a time. pax "selects" files from
60 * the expansion of each arg into the corresponding file tree (if the arg is a
61 * directory, otherwise the node itself is just passed to pax). The selection
62 * is modified by the -n and -u flags. The user is informed when a specific
63 * file arg does not generate any selected files. -n keeps expanding the file
64 * tree arg until one of its files is selected, then skips to the next file
65 * arg. when the user does not supply the file trees as command line args to
66 * pax, they are read from stdin
69 static FTS *ftsp = NULL; /* current FTS handle */
70 static int ftsopts; /* options to be used on fts_open */
71 static char *farray[2]; /* array for passing each arg to fts */
72 static FTREE *fthead = NULL; /* head of linked list of file args */
73 static FTREE *fttail = NULL; /* tail of linked list of file args */
74 static FTREE *ftcur = NULL; /* current file arg being processed */
75 static FTSENT *ftent = NULL; /* current file tree entry */
76 static int ftree_skip; /* when set skip to next file arg */
78 static int ftree_arg __P((void));
82 * initialize the options passed to fts_open() during this run of pax
83 * options are based on the selection of pax options by the user
84 * fts_start() also calls fts_arg() to open the first valid file arg. We
85 * also attempt to reset directory access times when -t (tflag) is set.
87 * 0 if there is at least one valid file arg to process, -1 otherwise
99 * set up the operation mode of fts, open the first file arg. We must
100 * use FTS_NOCHDIR, as the user may have to open multiple archives and
101 * if fts did a chdir off into the boondocks, we may create an archive
102 * volume in an place where the user did not expect to.
104 ftsopts = FTS_NOCHDIR;
107 * optional user flags that effect file traversal
108 * -H command line symlink follow only (half follow)
109 * -L follow sylinks (logical)
110 * -P do not follow sylinks (physical). This is the default.
111 * -X do not cross over mount points
112 * -t preserve access times on files read.
113 * -n select only the first member of a file tree when a match is found
114 * -d do not extract subtrees rooted at a directory arg.
117 ftsopts |= FTS_LOGICAL;
119 ftsopts |= FTS_PHYSICAL;
122 paxwarn(0, "The -H flag is not supported on this version");
124 ftsopts |= FTS_COMFOLLOW;
129 if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) {
130 paxwarn(1, "Unable to allocate memory for file name buffer");
136 if (tflag && (atdir_start() < 0))
143 * add the arg to the linked list of files to process. Each will be
144 * processed by fts one at a time
146 * 0 if added to the linked list, -1 if failed
151 ftree_add(register char *str, int chflg)
154 ftree_add(str, chflg)
163 * simple check for bad args
165 if ((str == NULL) || (*str == '\0')) {
166 paxwarn(0, "Invalid file name argument");
171 * allocate FTREE node and add to the end of the linked list (args are
172 * processed in the same order they were passed to pax). Get rid of any
173 * trailing / the user may pass us. (watch out for / by itself).
175 if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) {
176 paxwarn(0, "Unable to allocate memory for filename");
180 if (((len = strlen(str) - 1) > 0) && (str[len] == '/'))
186 if (fthead == NULL) {
187 fttail = fthead = ft;
197 * this entry has been selected by pax. bump up reference count and handle
198 * -n and -d processing.
203 ftree_sel(register ARCHD *arcn)
207 register ARCHD *arcn;
211 * set reference bit for this pattern. This linked list is only used
212 * when file trees are supplied pax as args. The list is not used when
213 * the trees are read from stdin.
219 * if -n we are done with this arg, force a skip to the next arg when
220 * pax asks for the next file in next_file().
221 * if -d we tell fts only to match the directory (if the arg is a dir)
222 * and not the entire file tree rooted at that point.
227 if (!dflag || (arcn->type != PAX_DIR))
231 (void)fts_set(ftsp, ftent, FTS_SKIP);
236 * called at end on pax execution. Prints all those file args that did not
237 * have a selected member (reference count still 0)
249 register int wban = 0;
252 * make sure all dir access times were reset.
258 * walk down list and check reference count. Print out those members
259 * that never had a match
261 for (ft = fthead; ft != NULL; ft = ft->fow) {
262 if ((ft->refcnt > 0) || ft->chflg)
265 paxwarn(1,"WARNING! These file names were not selected:");
268 (void)fprintf(stderr, "%s\n", ft->fname);
274 * Get the next file arg for fts to process. Can be from either the linked
275 * list or read from stdin when the user did not them as args to pax. Each
276 * arg is processed until the first successful fts_open().
278 * 0 when the next arg is ready to go, -1 if out of file args (or EOF on
293 * close off the current file tree
296 (void)fts_close(ftsp);
301 * keep looping until we get a valid file tree to process. Stop when we
302 * reach the end of the list (or get an eof on stdin)
305 if (fthead == NULL) {
307 * the user didn't supply any args, get the file trees
308 * to process from stdin;
310 if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL)
312 if ((pt = strchr(farray[0], '\n')) != NULL)
316 * the user supplied the file args as arguments to pax
320 else if ((ftcur = ftcur->fow) == NULL)
323 /* First fchdir() back... */
324 if (fchdir(cwdfd) < 0) {
326 "Can't fchdir to starting directory");
329 if (chdir(ftcur->fname) < 0) {
330 syswarn(1, errno, "Can't chdir to %s",
336 farray[0] = ftcur->fname;
340 * watch it, fts wants the file arg stored in a array of char
341 * ptrs, with the last one a null. we use a two element array
342 * and set farray[0] to point at the buffer with the file name
343 * in it. We cannot pass all the file args to fts at one shot
344 * as we need to keep a handle on which file arg generates what
345 * files (the -n and -d flags need this). If the open is
346 * successful, return a 0.
348 if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL)
356 * supplies the next file to process in the supplied archd structure.
358 * 0 when contents of arcn have been set with the next file, -1 when done.
363 next_file(register ARCHD *arcn)
367 register ARCHD *arcn;
375 * ftree_sel() might have set the ftree_skip flag if the user has the
376 * -n option and a file was selected from this file arg tree. (-n says
377 * only one member is matched for each pattern) ftree_skip being 1
378 * forces us to go to the next arg now.
382 * clear and go to next arg
390 * loop until we get a valid file to process
393 if ((ftent = fts_read(ftsp)) == NULL) {
395 * out of files in this tree, go to next arg, if none
404 * handle each type of fts_read() flag
406 switch(ftent->fts_info) {
418 * already saw this directory. If the user wants file
419 * access times reset, we use this to restore the
420 * access time for this directory since this is the
421 * last time we will see it in this file subtree
422 * remember to force the time (this is -t on a read
423 * directory, not a created directory).
426 if (!tflag || (get_atdir(ftent->fts_statb.st_dev,
427 ftent->fts_statb.st_ino, &mtime, &atime) < 0))
429 if (!tflag || (get_atdir(ftent->fts_statp->st_dev,
430 ftent->fts_statp->st_ino, &mtime, &atime) < 0))
433 set_ftime(ftent->fts_path, mtime, atime, 1);
437 * fts claims a file system cycle
439 paxwarn(1,"File system cycle found at %s",ftent->fts_path);
445 syswarn(1, ftent->fts_errno,
447 "Unable to read directory %s", ftent->fts_path);
453 syswarn(1, ftent->fts_errno,
455 "File system traversal error");
462 syswarn(1, ftent->fts_errno,
464 "Unable to access %s", ftent->fts_path);
469 * ok got a file tree node to process. copy info into arcn
470 * structure (initialize as required)
475 arcn->ln_name[0] = '\0';
477 arcn->sb = ftent->fts_statb;
479 arcn->sb = *(ftent->fts_statp);
483 * file type based set up and copy into the arcn struct
485 * we try to reset the access time on all files and directories
486 * we may read when the -t flag is specified. files are reset
487 * when we close them after copying. we reset the directories
488 * when we are done with their file tree (we also clean up at
489 * end in case we cut short a file tree traversal). However
490 * there is no way to reset access times on symlinks.
492 switch(S_IFMT & arcn->sb.st_mode) {
494 arcn->type = PAX_DIR;
497 add_atdir(ftent->fts_path, arcn->sb.st_dev,
498 arcn->sb.st_ino, arcn->sb.st_mtime,
502 arcn->type = PAX_CHR;
505 arcn->type = PAX_BLK;
509 * only regular files with have data to store on the
510 * archive. all others will store a zero length skip.
511 * the skip field is used by pax for actual data it has
512 * to read (or skip over).
514 arcn->type = PAX_REG;
515 arcn->skip = arcn->sb.st_size;
518 arcn->type = PAX_SLK;
520 * have to read the symlink path from the file
522 if ((cnt = readlink(ftent->fts_path, arcn->ln_name,
523 PAXPATHLEN - 1)) < 0) {
524 syswarn(1, errno, "Unable to read symlink %s",
529 * set link name length, watch out readlink does not
530 * always NUL terminate the link path
532 arcn->ln_name[cnt] = '\0';
537 * under BSD storing a socket is senseless but we will
538 * let the format specific write function make the
539 * decision of what to do with it.
541 arcn->type = PAX_SCK;
544 arcn->type = PAX_FIF;
551 * copy file name, set file name length
553 arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, sizeof(arcn->name) - 1);
554 arcn->name[arcn->nlen] = '\0';
555 arcn->org_name = ftent->fts_path;