Commit | Line | Data |
---|---|---|
addf0c4a | 1 | /* |
0f78b815 WD |
2 | * Backup handling code. |
3 | * | |
4 | * Copyright (C) 1999 Andrew Tridgell | |
b3bf9b9d | 5 | * Copyright (C) 2003-2009 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 3 of the License, or | |
10 | * (at your option) any later version. | |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 19 | */ |
3d19b4c8 AT |
20 | |
21 | #include "rsync.h" | |
09ca0d15 | 22 | #include "ifuncs.h" |
3d19b4c8 | 23 | |
378a074c | 24 | extern int am_root; |
1c3344a1 | 25 | extern int preserve_acls; |
16edf865 | 26 | extern int preserve_xattrs; |
378a074c | 27 | extern int preserve_devices; |
b5c6a6ae | 28 | extern int preserve_specials; |
378a074c | 29 | extern int preserve_links; |
377dbd20 | 30 | extern int safe_symlinks; |
6b2a3d5d | 31 | extern int backup_dir_len; |
82ad07c4 WD |
32 | extern unsigned int backup_dir_remainder; |
33 | extern char backup_dir_buf[MAXPATHLEN]; | |
34 | extern char *backup_suffix; | |
35 | extern char *backup_dir; | |
378a074c | 36 | |
c94e4afb | 37 | /* make a complete pathname for backup file */ |
45d8bfe0 | 38 | char *get_backup_name(const char *fname) |
c94e4afb | 39 | { |
c94e4afb WD |
40 | if (backup_dir) { |
41 | if (stringjoin(backup_dir_buf + backup_dir_len, backup_dir_remainder, | |
42 | fname, backup_suffix, NULL) < backup_dir_remainder) | |
43 | return backup_dir_buf; | |
44 | } else { | |
fb22c277 WD |
45 | if (stringjoin(backup_dir_buf, MAXPATHLEN, |
46 | fname, backup_suffix, NULL) < MAXPATHLEN) | |
47 | return backup_dir_buf; | |
c94e4afb WD |
48 | } |
49 | ||
50 | rprintf(FERROR, "backup filename too long\n"); | |
51 | return NULL; | |
52 | } | |
53 | ||
378a074c AT |
54 | /**************************************************************************** |
55 | Create a directory given an absolute path, perms based upon another directory | |
56 | path | |
57 | ****************************************************************************/ | |
e1ac7791 | 58 | int make_bak_dir(const char *fullpath) |
378a074c | 59 | { |
e1ac7791 | 60 | char fbuf[MAXPATHLEN], *rel, *end, *p; |
1c3344a1 | 61 | struct file_struct *file; |
e1ac7791 | 62 | int len = backup_dir_len; |
13710874 | 63 | stat_x sx; |
de0e2250 | 64 | |
e1ac7791 | 65 | while (*fullpath == '.' && fullpath[1] == '/') { |
de0e2250 | 66 | fullpath += 2; |
e1ac7791 WD |
67 | len -= 2; |
68 | } | |
69 | ||
70 | if (strlcpy(fbuf, fullpath, sizeof fbuf) >= sizeof fbuf) | |
71 | return -1; | |
72 | ||
73 | rel = fbuf + len; | |
74 | end = p = rel + strlen(rel); | |
de0e2250 WD |
75 | |
76 | /* Try to find an existing dir, starting from the deepest dir. */ | |
77 | while (1) { | |
e1ac7791 WD |
78 | if (--p == fbuf) |
79 | return -1; | |
de0e2250 WD |
80 | if (*p == '/') { |
81 | *p = '\0'; | |
e1ac7791 | 82 | if (mkdir_defmode(fbuf) == 0) |
de0e2250 WD |
83 | break; |
84 | if (errno != ENOENT) { | |
d62bcc17 WD |
85 | rsyserr(FERROR, errno, |
86 | "make_bak_dir mkdir %s failed", | |
e1ac7791 WD |
87 | full_fname(fbuf)); |
88 | return -1; | |
de0e2250 WD |
89 | } |
90 | } | |
47d6a60c | 91 | } |
de0e2250 WD |
92 | |
93 | /* Make all the dirs that we didn't find on the way here. */ | |
94 | while (1) { | |
95 | if (p >= rel) { | |
96 | /* Try to transfer the directory settings of the | |
97 | * actual dir that the files are coming from. */ | |
09ca0d15 | 98 | init_stat_x(&sx); |
9439c0cb | 99 | if (x_stat(rel, &sx.st, NULL) < 0) { |
d62bcc17 WD |
100 | rsyserr(FERROR, errno, |
101 | "make_bak_dir stat %s failed", | |
102 | full_fname(rel)); | |
de0e2250 | 103 | } else { |
1c3344a1 WD |
104 | if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS))) |
105 | continue; | |
106 | #ifdef SUPPORT_ACLS | |
107 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
108 | get_acl(rel, &sx); | |
109 | cache_acl(file, &sx); | |
110 | free_acl(&sx); | |
111 | } | |
1e999f9f | 112 | #endif |
16edf865 WD |
113 | #ifdef SUPPORT_XATTRS |
114 | if (preserve_xattrs) { | |
115 | get_xattr(rel, &sx); | |
116 | cache_xattr(file, &sx); | |
117 | free_xattr(&sx); | |
118 | } | |
119 | #endif | |
e1ac7791 | 120 | set_file_attrs(fbuf, file, NULL, NULL, 0); |
b13505da | 121 | unmake_file(file); |
47d6a60c S |
122 | } |
123 | } | |
de0e2250 WD |
124 | *p = '/'; |
125 | p += strlen(p); | |
126 | if (p == end) | |
127 | break; | |
e1ac7791 | 128 | if (mkdir_defmode(fbuf) < 0) { |
d62bcc17 | 129 | rsyserr(FERROR, errno, "make_bak_dir mkdir %s failed", |
e1ac7791 WD |
130 | full_fname(fbuf)); |
131 | return -1; | |
de0e2250 | 132 | } |
47d6a60c | 133 | } |
de0e2250 | 134 | |
e1ac7791 | 135 | return 0; |
378a074c AT |
136 | } |
137 | ||
21cddef2 WD |
138 | /* Has same return codes as make_backup(). */ |
139 | static inline int link_or_rename(const char *from, const char *to, | |
140 | BOOL prefer_rename, STRUCT_STAT *stp) | |
66203a98 | 141 | { |
21cddef2 WD |
142 | if (S_ISLNK(stp->st_mode)) { |
143 | if (prefer_rename) | |
144 | goto do_rename; | |
145 | #ifndef CAN_HARDLINK_SYMLINK | |
146 | return 0; /* Use copy code. */ | |
147 | #endif | |
148 | } | |
149 | if (IS_SPECIAL(stp->st_mode) || IS_DEVICE(stp->st_mode)) { | |
150 | if (prefer_rename) | |
151 | goto do_rename; | |
152 | #ifndef CAN_HARDLINK_SPECIAL | |
153 | return 0; /* Use copy code. */ | |
154 | #endif | |
155 | } | |
156 | #ifdef SUPPORT_HARD_LINKS | |
157 | if (!S_ISDIR(stp->st_mode)) { | |
158 | if (do_link(from, to) == 0) | |
159 | return 2; | |
160 | return 0; | |
161 | } | |
162 | #endif | |
163 | do_rename: | |
164 | if (do_rename(from, to) == 0) { | |
165 | if (stp->st_nlink > 1 && !S_ISDIR(stp->st_mode)) { | |
166 | /* If someone has hard-linked the file into the backup | |
167 | * dir, rename() might return success but do nothing! */ | |
168 | robust_unlink(to); /* Just in case... */ | |
f1ca7c44 | 169 | } |
21cddef2 | 170 | return 1; |
f1ca7c44 | 171 | } |
62c9e6b3 | 172 | return 0; |
de0e2250 | 173 | } |
66203a98 | 174 | |
21cddef2 WD |
175 | /* Hard-link, rename, or copy an item to the backup name. Returns 2 if item |
176 | * was duplicated into backup area, 1 if item was moved, or 0 for failure.*/ | |
177 | int make_backup(const char *fname, BOOL prefer_rename) | |
66203a98 | 178 | { |
13710874 | 179 | stat_x sx; |
66203a98 | 180 | struct file_struct *file; |
21cddef2 WD |
181 | int save_preserve_xattrs; |
182 | char *buf = get_backup_name(fname); | |
183 | int ret = 0; | |
184 | ||
185 | if (!buf) | |
186 | return 0; | |
378a074c | 187 | |
09ca0d15 WD |
188 | init_stat_x(&sx); |
189 | /* Return success if no file to keep. */ | |
9439c0cb | 190 | if (x_lstat(fname, &sx.st, NULL) < 0) |
9fd62d15 | 191 | return 1; |
66203a98 | 192 | |
21cddef2 WD |
193 | /* Try a hard-link or a rename first. Using rename is not atomic, but |
194 | * is more efficient than forcing a copy for larger files when no hard- | |
195 | * linking is possible. */ | |
196 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
197 | goto success; | |
198 | if (errno == EEXIST) { | |
199 | STRUCT_STAT bakst; | |
200 | if (do_lstat(buf, &bakst) == 0) { | |
201 | int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE; | |
202 | if (delete_item(buf, bakst.st_mode, flags) != 0) | |
203 | return 0; | |
204 | } | |
205 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
206 | goto success; | |
207 | } else if (backup_dir && errno == ENOENT) { | |
208 | /* If the backup dir is missing, try again after making it. */ | |
209 | if (make_bak_dir(buf) != 0) | |
210 | return 0; | |
211 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
212 | goto success; | |
82ad07c4 | 213 | } |
378a074c | 214 | |
21cddef2 WD |
215 | /* Fall back to making a copy. */ |
216 | if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS))) | |
217 | return 1; /* the file could have disappeared */ | |
218 | ||
1c3344a1 WD |
219 | #ifdef SUPPORT_ACLS |
220 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
221 | get_acl(fname, &sx); | |
222 | cache_acl(file, &sx); | |
223 | free_acl(&sx); | |
224 | } | |
225 | #endif | |
16edf865 WD |
226 | #ifdef SUPPORT_XATTRS |
227 | if (preserve_xattrs) { | |
228 | get_xattr(fname, &sx); | |
229 | cache_xattr(file, &sx); | |
230 | free_xattr(&sx); | |
231 | } | |
232 | #endif | |
1c3344a1 | 233 | |
378a074c | 234 | /* Check to see if this is a device file, or link */ |
b5c6a6ae WD |
235 | if ((am_root && preserve_devices && IS_DEVICE(file->mode)) |
236 | || (preserve_specials && IS_SPECIAL(file->mode))) { | |
88e05f84 | 237 | int save_errno; |
a64f19e2 | 238 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) { |
88e05f84 | 239 | save_errno = errno ? errno : EINVAL; /* 0 paranoia */ |
f1ca7c44 | 240 | if (errno == ENOENT && make_bak_dir(buf) == 0) { |
a64f19e2 | 241 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) |
f1ca7c44 WD |
242 | save_errno = errno ? errno : save_errno; |
243 | else | |
244 | save_errno = 0; | |
245 | } | |
246 | if (save_errno) { | |
247 | rsyserr(FERROR, save_errno, "mknod %s failed", | |
248 | full_fname(buf)); | |
249 | } | |
88e05f84 WD |
250 | } else |
251 | save_errno = 0; | |
951e826b | 252 | if (DEBUG_GTE(BACKUP, 1) && save_errno == 0) { |
93e28fbd | 253 | rprintf(FINFO, "make_backup: DEVICE %s successful.\n", |
45c49b52 | 254 | fname); |
47d6a60c | 255 | } |
21cddef2 | 256 | ret = 2; |
47d6a60c | 257 | } |
378a074c | 258 | |
21cddef2 WD |
259 | if (!ret && S_ISDIR(file->mode)) { |
260 | int ret_code; | |
378a074c | 261 | /* make an empty directory */ |
f1ca7c44 WD |
262 | if (do_mkdir(buf, file->mode) < 0) { |
263 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
264 | if (errno == ENOENT && make_bak_dir(buf) == 0) { | |
265 | if (do_mkdir(buf, file->mode) < 0) | |
266 | save_errno = errno ? errno : save_errno; | |
267 | else | |
268 | save_errno = 0; | |
269 | } | |
270 | if (save_errno) { | |
271 | rsyserr(FINFO, save_errno, "mkdir %s failed", | |
272 | full_fname(buf)); | |
273 | } | |
377dbd20 | 274 | } |
47d6a60c | 275 | |
377dbd20 | 276 | ret_code = do_rmdir(fname); |
951e826b | 277 | if (DEBUG_GTE(BACKUP, 1)) { |
ea42541f WD |
278 | rprintf(FINFO, "make_backup: RMDIR %s returns %i\n", |
279 | full_fname(fname), ret_code); | |
47d6a60c | 280 | } |
21cddef2 | 281 | ret = 2; |
47d6a60c | 282 | } |
378a074c | 283 | |
4f5b0756 | 284 | #ifdef SUPPORT_LINKS |
21cddef2 | 285 | if (!ret && preserve_links && S_ISLNK(file->mode)) { |
82ad07c4 WD |
286 | const char *sl = F_SYMLINK(file); |
287 | if (safe_symlinks && unsafe_symlink(sl, buf)) { | |
951e826b | 288 | if (INFO_GTE(SYMSAFE, 1)) { |
47d6a60c | 289 | rprintf(FINFO, "ignoring unsafe symlink %s -> %s\n", |
82ad07c4 | 290 | full_fname(buf), sl); |
47d6a60c | 291 | } |
21cddef2 | 292 | ret = 2; |
93e28fbd | 293 | } else { |
f1ca7c44 WD |
294 | if (do_symlink(sl, buf) < 0) { |
295 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
296 | if (errno == ENOENT && make_bak_dir(buf) == 0) { | |
297 | if (do_symlink(sl, buf) < 0) | |
298 | save_errno = errno ? errno : save_errno; | |
299 | else | |
300 | save_errno = 0; | |
301 | } | |
302 | if (save_errno) { | |
303 | rsyserr(FERROR, save_errno, "link %s -> \"%s\"", | |
304 | full_fname(buf), sl); | |
305 | } | |
93e28fbd | 306 | } |
21cddef2 | 307 | ret = 2; |
47d6a60c | 308 | } |
47d6a60c | 309 | } |
378a074c | 310 | #endif |
378a074c | 311 | |
21cddef2 | 312 | if (!ret && !S_ISREG(file->mode)) { |
47d6a60c | 313 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", |
45c49b52 | 314 | fname); |
82ad07c4 | 315 | unmake_file(file); |
21cddef2 | 316 | return 2; |
47d6a60c | 317 | } |
66203a98 | 318 | |
21cddef2 WD |
319 | /* Copy to backup tree if a file. */ |
320 | if (!ret) { | |
321 | if (copy_file(fname, buf, -1, file->mode, 1) < 0) { | |
d62bcc17 | 322 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
45c49b52 | 323 | full_fname(fname), buf); |
21cddef2 WD |
324 | unmake_file(file); |
325 | return 0; | |
47d6a60c | 326 | } |
21cddef2 | 327 | ret = 2; |
47d6a60c | 328 | } |
21cddef2 WD |
329 | |
330 | save_preserve_xattrs = preserve_xattrs; | |
e9489cd6 | 331 | preserve_xattrs = 0; |
16edf865 | 332 | set_file_attrs(buf, file, NULL, fname, 0); |
e9489cd6 | 333 | preserve_xattrs = save_preserve_xattrs; |
21cddef2 | 334 | |
82ad07c4 | 335 | unmake_file(file); |
378a074c | 336 | |
21cddef2 | 337 | success: |
951e826b | 338 | if (INFO_GTE(BACKUP, 1)) { |
4875d6b6 | 339 | rprintf(FINFO, "backed up %s to %s\n", |
45c49b52 | 340 | fname, buf); |
4875d6b6 | 341 | } |
21cddef2 | 342 | return ret; |
66203a98 | 343 | } |