2 Copyright (C) 2000-2003 Kern Sibbald and John Walker
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License as
6 published by the Free Software Foundation; either version 2 of
7 the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU General Public
15 License along with this program; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
19 This file is based on GNU TAR source code. Except for a few key
20 ideas and some key snippets of code, it has been rewritten for Bacula.
24 Many thanks to the TAR programmers.
30 /*#include "system.h" */
33 extern size_t name_max; /* filename max length */
34 extern size_t path_max; /* path name max length */
36 #ifndef HAVE_READDIR_R
37 int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
42 * Structure for keeping track of hard linked files
66 * handle_file is the callback for handling the file.
68 * parent_device is the device we are currently on
69 * top_level is 1 when not recursing or 0 when
70 * decending into a directory.
73 find_one_file(FF_PKT *ff_pkt, int handle_file(FF_PKT *ff, void *hpkt), void *pkt,
74 char *fname, dev_t parent_device, int top_level)
76 struct utimbuf restore_times;
79 ff_pkt->fname = ff_pkt->link = fname;
81 if (lstat(fname, &ff_pkt->statp) != 0) {
82 /* Cannot stat file */
83 ff_pkt->type = FT_NOSTAT;
84 ff_pkt->ff_errno = errno;
85 return handle_file(ff_pkt, pkt);
88 Dmsg1(60, "File ----: %s\n", fname);
90 if (S_ISLNK(ff_pkt->statp.st_mode))
91 Dmsg1(60, "Link-------------: %s \n", fname);
94 /* Save current times of this directory in case we need to
95 * reset them because the user doesn't want them changed.
97 restore_times.actime = ff_pkt->statp.st_atime;
98 restore_times.modtime = ff_pkt->statp.st_mtime;
102 * If this is an Incremental backup, see if file was modified
103 * since our last "save_time", presumably the last Full save
106 if (ff_pkt->incremental && !S_ISDIR(ff_pkt->statp.st_mode)) {
107 Dmsg1(100, "Non-directory incremental: %s\n", ff_pkt->fname);
108 /* Not a directory */
109 if (ff_pkt->statp.st_mtime < ff_pkt->save_time
110 && (ff_pkt->mtime_only ||
111 ff_pkt->statp.st_ctime < ff_pkt->save_time)) {
112 /* Incremental option, file not changed */
113 ff_pkt->type = FT_NOCHG;
114 Dmsg1(100, "File not changed: %s\n", ff_pkt->fname);
115 Dmsg4(200, "save_time=%d mtime=%d mtime_only=%d st_ctime=%d\n",
116 ff_pkt->save_time, ff_pkt->statp.st_mtime,
117 ff_pkt->mtime_only, ff_pkt->statp.st_ctime);
118 return handle_file(ff_pkt, pkt);
123 /* See if we are trying to dump the archive. */
124 if (ar_dev && ff_pkt->statp.st_dev == ar_dev && ff_pkt->statp.st_ino == ar_ino) {
125 ff_pkt->type = FT_ISARCH;
126 return handle_file(ff_pkt, pkt);
131 * Handle hard linked files
133 * Maintain a list of hard linked files already backed up. This
134 * allows us to ensure that the data of each file gets backed
137 if (ff_pkt->statp.st_nlink > 1
138 && (S_ISREG(ff_pkt->statp.st_mode)
139 || S_ISCHR(ff_pkt->statp.st_mode)
140 || S_ISBLK(ff_pkt->statp.st_mode)
141 || S_ISFIFO(ff_pkt->statp.st_mode)
142 || S_ISSOCK(ff_pkt->statp.st_mode))) {
146 /* Search link list of hard linked files */
147 for (lp = ff_pkt->linklist; lp; lp = lp->next)
148 if (lp->ino == ff_pkt->statp.st_ino && lp->dev == ff_pkt->statp.st_dev) {
149 ff_pkt->link = lp->name;
150 ff_pkt->type = FT_LNKSAVED; /* Handle link, file already saved */
151 return handle_file(ff_pkt, pkt);
154 /* File not previously dumped. Chain it into our list. */
155 lp = (struct f_link *)bmalloc(sizeof(struct f_link) + strlen(fname) +1);
156 lp->ino = ff_pkt->statp.st_ino;
157 lp->dev = ff_pkt->statp.st_dev;
158 strcpy(lp->name, fname);
159 lp->next = ff_pkt->linklist;
160 ff_pkt->linklist = lp;
163 /* This is not a link to a previously dumped file, so dump it. */
164 if (S_ISREG(ff_pkt->statp.st_mode)) {
167 sizeleft = ff_pkt->statp.st_size;
169 /* Don't bother opening empty, world readable files. Also do not open
170 files when archive is meant for /dev/null. */
171 if (ff_pkt->null_output_device || (sizeleft == 0
172 && MODE_RALL == (MODE_RALL & ff_pkt->statp.st_mode))) {
173 ff_pkt->type = FT_REGE;
175 ff_pkt->type = FT_REG;
177 return handle_file(ff_pkt, pkt);
179 } else if (S_ISLNK(ff_pkt->statp.st_mode)) {
181 char *buffer = (char *)alloca(path_max + name_max + 2);
183 size = readlink(fname, buffer, path_max + name_max + 1);
185 /* Could not follow link */
186 ff_pkt->type = FT_NOFOLLOW;
187 ff_pkt->ff_errno = errno;
188 return handle_file(ff_pkt, pkt);
191 ff_pkt->link = buffer;
192 ff_pkt->type = FT_LNK; /* got a real link */
193 return handle_file(ff_pkt, pkt);
195 } else if (S_ISDIR(ff_pkt->statp.st_mode)) {
197 struct dirent *entry, *result;
202 dev_t our_device = ff_pkt->statp.st_dev;
204 if (access(fname, R_OK) == -1 && geteuid() != 0) {
205 /* Could not access() directory */
206 ff_pkt->type = FT_NOACCESS;
207 ff_pkt->ff_errno = errno;
208 return handle_file(ff_pkt, pkt);
211 /* Build a canonical directory name with a trailing slash. */
213 link_len = len + 200;
214 link = (char *)bmalloc(link_len + 2);
215 bstrncpy(link, fname, link_len);
216 /* Strip all trailing slashes */
217 while (len >= 1 && link[len - 1] == '/')
219 link[len++] = '/'; /* add back one */
223 if (ff_pkt->incremental &&
224 (ff_pkt->statp.st_mtime < ff_pkt->save_time &&
225 ff_pkt->statp.st_ctime < ff_pkt->save_time)) {
226 /* Incremental option, directory entry not changed */
227 ff_pkt->type = FT_DIRNOCHG;
229 ff_pkt->type = FT_DIR;
231 handle_file(ff_pkt, pkt); /* handle directory entry */
233 ff_pkt->link = ff_pkt->fname; /* reset "link" */
236 * Do not decend into subdirectories (recurse) if the
237 * user has turned it off for this directory.
239 if (ff_pkt->flags & FO_NO_RECURSION) {
241 /* No recursion into this directory */
242 ff_pkt->type = FT_NORECURSE;
243 return handle_file(ff_pkt, pkt);
247 * See if we are crossing file systems, and
248 * avoid doing so if the user only wants to dump one file system.
250 if (!top_level && !(ff_pkt->flags & FO_MULTIFS) &&
251 parent_device != ff_pkt->statp.st_dev) {
253 /* returning here means we do not handle this directory */
254 ff_pkt->type = FT_NOFSCHG;
255 return handle_file(ff_pkt, pkt);
258 * Now process the files in this directory.
261 if ((directory = opendir(fname)) == NULL) {
263 ff_pkt->type = FT_NOOPEN;
264 ff_pkt->ff_errno = errno;
265 return handle_file(ff_pkt, pkt);
269 * This would possibly run faster if we chdir to the directory
270 * before traversing it.
273 entry = (struct dirent *)malloc(sizeof(struct dirent) + name_max + 100);
278 status = readdir_r(directory, entry, &result);
279 sm_check(__FILE__, __LINE__, False);
280 Dmsg3(200, "readdir stat=%d result=%x name=%s\n", status, result,
282 if (status != 0 || result == NULL) {
285 ASSERT(name_max+1 > sizeof(struct dirent) + (int)NAMELEN(entry));
287 /* Skip `.', `..', and excluded file names. */
288 if (p[0] == '\0' || (p[0] == '.' && (p[1] == '\0' ||
289 (p[1] == '.' && p[2] == '\0')))) {
293 if ((int)NAMELEN(entry) + len >= link_len) {
294 link_len = len + NAMELEN(entry) + 1;
295 link = (char *)brealloc(link, link_len + 1);
298 for (i=0; i < (int)NAMELEN(entry); i++) {
302 sm_check(__FILE__, __LINE__, False);
303 if (!file_is_excluded(ff_pkt, link)) {
304 rtn_stat = find_one_file(ff_pkt, handle_file, pkt, link, our_device, 0);
311 if (ff_pkt->atime_preserve) {
312 utime(fname, &restore_times);
315 } /* end check for directory */
318 * If it is explicitly mentioned (i.e. top_level) and is
319 * a block device, we do a raw backup of it or if it is
320 * a fifo, we simply read it.
322 if (top_level && S_ISBLK(ff_pkt->statp.st_mode)) {
323 ff_pkt->type = FT_RAW; /* raw partition */
324 } else if (top_level && S_ISFIFO(ff_pkt->statp.st_mode) &&
325 ff_pkt->flags & FO_READFIFO) {
326 ff_pkt->type = FT_FIFO;
328 /* The only remaining types are special (character, ...) files */
329 ff_pkt->type = FT_SPEC;
331 return handle_file(ff_pkt, pkt);
334 int term_find_one(FF_PKT *ff)
336 struct f_link *lp, *lc;
339 /* Free up list of hard linked files */
340 for (lp = ff->linklist; lp;) {