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 | |
9b594a53 WD |
37 | /* Returns -1 on error, 0 on missing dir, and 1 on present dir. */ |
38 | static int validate_backup_dir(void) | |
39 | { | |
40 | STRUCT_STAT st; | |
41 | ||
42 | if (do_lstat(backup_dir_buf, &st) < 0) { | |
43 | if (errno == ENOENT) | |
44 | return 0; | |
45 | rsyserr(FERROR, errno, "backup lstat %s failed", backup_dir_buf); | |
46 | return -1; | |
47 | } | |
48 | if (!S_ISDIR(st.st_mode)) { | |
49 | int flags = get_del_for_flag(st.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE; | |
50 | if (delete_item(backup_dir_buf, st.st_mode, flags) == 0) | |
51 | return 0; | |
52 | return -1; | |
53 | } | |
54 | return 1; | |
55 | } | |
56 | ||
3696674b WD |
57 | /* Create a backup path from the given fname, putting the result into |
58 | * backup_dir_buf. Any new directories (compared to the prior backup | |
59 | * path) are ensured to exist as directories, replacing anything else | |
60 | * that may be in the way (e.g. a symlink). */ | |
61 | static BOOL copy_valid_path(const char *fname) | |
378a074c | 62 | { |
3696674b | 63 | const char *f; |
9b594a53 | 64 | int val; |
3696674b | 65 | BOOL ret = True; |
13710874 | 66 | stat_x sx; |
3696674b | 67 | char *b, *rel = backup_dir_buf + backup_dir_len, *name = rel; |
de0e2250 | 68 | |
3696674b WD |
69 | for (f = fname, b = rel; *f && *f == *b; f++, b++) { |
70 | if (*b == '/') | |
71 | name = b + 1; | |
e1ac7791 WD |
72 | } |
73 | ||
3696674b WD |
74 | if (stringjoin(rel, backup_dir_remainder, fname, backup_suffix, NULL) >= backup_dir_remainder) { |
75 | rprintf(FERROR, "backup filename too long\n"); | |
76 | *name = '\0'; | |
77 | return False; | |
78 | } | |
e1ac7791 | 79 | |
3696674b WD |
80 | for ( ; ; name = b + 1) { |
81 | if ((b = strchr(name, '/')) == NULL) | |
82 | return True; | |
83 | *b = '\0'; | |
de0e2250 | 84 | |
9b594a53 WD |
85 | val = validate_backup_dir(); |
86 | if (val == 0) | |
87 | break; | |
88 | if (val < 0) { | |
3696674b WD |
89 | *name = '\0'; |
90 | return False; | |
de0e2250 | 91 | } |
3696674b WD |
92 | |
93 | *b = '/'; | |
47d6a60c | 94 | } |
de0e2250 | 95 | |
3696674b WD |
96 | init_stat_x(&sx); |
97 | ||
98 | for ( ; b; name = b + 1, b = strchr(name, '/')) { | |
99 | *b = '\0'; | |
100 | ||
9fbec6e4 | 101 | while (do_mkdir(backup_dir_buf, ACCESSPERMS) < 0) { |
9b594a53 WD |
102 | if (errno == EEXIST) { |
103 | val = validate_backup_dir(); | |
104 | if (val > 0) | |
105 | break; | |
106 | if (val == 0) | |
107 | continue; | |
108 | } else | |
109 | rsyserr(FERROR, errno, "backup mkdir %s failed", backup_dir_buf); | |
3696674b WD |
110 | *name = '\0'; |
111 | ret = False; | |
9b594a53 | 112 | goto cleanup; |
3696674b WD |
113 | } |
114 | ||
115 | /* Try to transfer the directory settings of the actual dir | |
116 | * that the files are coming from. */ | |
117 | if (x_stat(rel, &sx.st, NULL) < 0) | |
118 | rsyserr(FERROR, errno, "backup stat %s failed", full_fname(rel)); | |
119 | else { | |
120 | struct file_struct *file; | |
121 | if (!(file = make_file(rel, NULL, NULL, 0, NO_FILTERS))) | |
122 | continue; | |
1c3344a1 | 123 | #ifdef SUPPORT_ACLS |
3696674b WD |
124 | if (preserve_acls && !S_ISLNK(file->mode)) { |
125 | get_acl(rel, &sx); | |
126 | cache_tmp_acl(file, &sx); | |
127 | free_acl(&sx); | |
128 | } | |
1e999f9f | 129 | #endif |
16edf865 | 130 | #ifdef SUPPORT_XATTRS |
3696674b WD |
131 | if (preserve_xattrs) { |
132 | get_xattr(rel, &sx); | |
133 | cache_tmp_xattr(file, &sx); | |
134 | free_xattr(&sx); | |
135 | } | |
16edf865 | 136 | #endif |
3696674b WD |
137 | set_file_attrs(backup_dir_buf, file, NULL, NULL, 0); |
138 | unmake_file(file); | |
139 | } | |
140 | ||
141 | *b = '/'; | |
142 | } | |
143 | ||
9b594a53 WD |
144 | cleanup: |
145 | ||
cb197514 | 146 | #ifdef SUPPORT_ACLS |
3696674b | 147 | uncache_tmp_acls(); |
cb197514 WD |
148 | #endif |
149 | #ifdef SUPPORT_XATTRS | |
3696674b | 150 | uncache_tmp_xattrs(); |
cb197514 | 151 | #endif |
3696674b WD |
152 | |
153 | return ret; | |
154 | } | |
155 | ||
156 | /* Make a complete pathname for backup file and verify any new path elements. */ | |
157 | char *get_backup_name(const char *fname) | |
158 | { | |
159 | if (backup_dir) { | |
160 | /* copy fname into backup_dir_buf while validating the dirs. */ | |
161 | if (copy_valid_path(fname)) | |
162 | return backup_dir_buf; | |
0b8a9bd6 | 163 | /* copy_valid_path() has printed an error message. */ |
3696674b | 164 | return NULL; |
47d6a60c | 165 | } |
de0e2250 | 166 | |
0b8a9bd6 MM |
167 | if (stringjoin(backup_dir_buf, MAXPATHLEN, fname, backup_suffix, NULL) < MAXPATHLEN) |
168 | return backup_dir_buf; | |
169 | ||
3696674b WD |
170 | rprintf(FERROR, "backup filename too long\n"); |
171 | return NULL; | |
378a074c AT |
172 | } |
173 | ||
21cddef2 WD |
174 | /* Has same return codes as make_backup(). */ |
175 | static inline int link_or_rename(const char *from, const char *to, | |
176 | BOOL prefer_rename, STRUCT_STAT *stp) | |
66203a98 | 177 | { |
d735fe20 WD |
178 | #ifdef SUPPORT_HARD_LINKS |
179 | if (!prefer_rename) { | |
21cddef2 | 180 | #ifndef CAN_HARDLINK_SYMLINK |
d735fe20 WD |
181 | if (S_ISLNK(stp->st_mode)) |
182 | return 0; /* Use copy code. */ | |
21cddef2 | 183 | #endif |
21cddef2 | 184 | #ifndef CAN_HARDLINK_SPECIAL |
d735fe20 WD |
185 | if (IS_SPECIAL(stp->st_mode) || IS_DEVICE(stp->st_mode)) |
186 | return 0; /* Use copy code. */ | |
21cddef2 | 187 | #endif |
3696674b WD |
188 | if (do_link(from, to) == 0) { |
189 | if (DEBUG_GTE(BACKUP, 1)) | |
190 | rprintf(FINFO, "make_backup: HLINK %s successful.\n", from); | |
5e2d51ee | 191 | return 2; |
3696674b | 192 | } |
5e2d51ee WD |
193 | /* We prefer to rename a regular file rather than copy it. */ |
194 | if (!S_ISREG(stp->st_mode) || errno == EEXIST || errno == EISDIR) | |
d735fe20 | 195 | return 0; |
21cddef2 WD |
196 | } |
197 | #endif | |
21cddef2 WD |
198 | if (do_rename(from, to) == 0) { |
199 | if (stp->st_nlink > 1 && !S_ISDIR(stp->st_mode)) { | |
200 | /* If someone has hard-linked the file into the backup | |
201 | * dir, rename() might return success but do nothing! */ | |
5e2d51ee | 202 | robust_unlink(from); /* Just in case... */ |
f1ca7c44 | 203 | } |
3696674b WD |
204 | if (DEBUG_GTE(BACKUP, 1)) |
205 | rprintf(FINFO, "make_backup: RENAME %s successful.\n", from); | |
21cddef2 | 206 | return 1; |
f1ca7c44 | 207 | } |
62c9e6b3 | 208 | return 0; |
de0e2250 | 209 | } |
66203a98 | 210 | |
21cddef2 WD |
211 | /* Hard-link, rename, or copy an item to the backup name. Returns 2 if item |
212 | * was duplicated into backup area, 1 if item was moved, or 0 for failure.*/ | |
213 | int make_backup(const char *fname, BOOL prefer_rename) | |
66203a98 | 214 | { |
13710874 | 215 | stat_x sx; |
66203a98 | 216 | struct file_struct *file; |
21cddef2 WD |
217 | int save_preserve_xattrs; |
218 | char *buf = get_backup_name(fname); | |
219 | int ret = 0; | |
220 | ||
221 | if (!buf) | |
222 | return 0; | |
378a074c | 223 | |
09ca0d15 WD |
224 | init_stat_x(&sx); |
225 | /* Return success if no file to keep. */ | |
9439c0cb | 226 | if (x_lstat(fname, &sx.st, NULL) < 0) |
9fd62d15 | 227 | return 1; |
66203a98 | 228 | |
21cddef2 WD |
229 | /* Try a hard-link or a rename first. Using rename is not atomic, but |
230 | * is more efficient than forcing a copy for larger files when no hard- | |
231 | * linking is possible. */ | |
232 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
233 | goto success; | |
d735fe20 | 234 | if (errno == EEXIST || errno == EISDIR) { |
21cddef2 WD |
235 | STRUCT_STAT bakst; |
236 | if (do_lstat(buf, &bakst) == 0) { | |
237 | int flags = get_del_for_flag(bakst.st_mode) | DEL_FOR_BACKUP | DEL_RECURSE; | |
238 | if (delete_item(buf, bakst.st_mode, flags) != 0) | |
239 | return 0; | |
240 | } | |
241 | if ((ret = link_or_rename(fname, buf, prefer_rename, &sx.st)) != 0) | |
242 | goto success; | |
82ad07c4 | 243 | } |
378a074c | 244 | |
21cddef2 WD |
245 | /* Fall back to making a copy. */ |
246 | if (!(file = make_file(fname, NULL, &sx.st, 0, NO_FILTERS))) | |
247 | return 1; /* the file could have disappeared */ | |
248 | ||
1c3344a1 WD |
249 | #ifdef SUPPORT_ACLS |
250 | if (preserve_acls && !S_ISLNK(file->mode)) { | |
251 | get_acl(fname, &sx); | |
cb197514 | 252 | cache_tmp_acl(file, &sx); |
1c3344a1 WD |
253 | free_acl(&sx); |
254 | } | |
255 | #endif | |
16edf865 WD |
256 | #ifdef SUPPORT_XATTRS |
257 | if (preserve_xattrs) { | |
258 | get_xattr(fname, &sx); | |
cb197514 | 259 | cache_tmp_xattr(file, &sx); |
16edf865 WD |
260 | free_xattr(&sx); |
261 | } | |
262 | #endif | |
1c3344a1 | 263 | |
378a074c | 264 | /* Check to see if this is a device file, or link */ |
b5c6a6ae WD |
265 | if ((am_root && preserve_devices && IS_DEVICE(file->mode)) |
266 | || (preserve_specials && IS_SPECIAL(file->mode))) { | |
3696674b WD |
267 | if (do_mknod(buf, file->mode, sx.st.st_rdev) < 0) |
268 | rsyserr(FERROR, errno, "mknod %s failed", full_fname(buf)); | |
269 | else if (DEBUG_GTE(BACKUP, 1)) | |
270 | rprintf(FINFO, "make_backup: DEVICE %s successful.\n", fname); | |
21cddef2 | 271 | ret = 2; |
47d6a60c | 272 | } |
378a074c | 273 | |
4f5b0756 | 274 | #ifdef SUPPORT_LINKS |
21cddef2 | 275 | if (!ret && preserve_links && S_ISLNK(file->mode)) { |
82ad07c4 | 276 | const char *sl = F_SYMLINK(file); |
e6f3a33c | 277 | if (safe_symlinks && unsafe_symlink(sl, fname)) { |
951e826b | 278 | if (INFO_GTE(SYMSAFE, 1)) { |
7a3ce973 MM |
279 | rprintf(FINFO, "not backing up unsafe symlink \"%s\" -> \"%s\"\n", |
280 | fname, sl); | |
47d6a60c | 281 | } |
21cddef2 | 282 | ret = 2; |
93e28fbd | 283 | } else { |
3696674b WD |
284 | if (do_symlink(sl, buf) < 0) |
285 | rsyserr(FERROR, errno, "link %s -> \"%s\"", full_fname(buf), sl); | |
286 | else if (DEBUG_GTE(BACKUP, 1)) | |
287 | rprintf(FINFO, "make_backup: SYMLINK %s successful.\n", fname); | |
21cddef2 | 288 | ret = 2; |
47d6a60c | 289 | } |
47d6a60c | 290 | } |
378a074c | 291 | #endif |
378a074c | 292 | |
21cddef2 | 293 | if (!ret && !S_ISREG(file->mode)) { |
3696674b | 294 | rprintf(FINFO, "make_bak: skipping non-regular file %s\n", fname); |
82ad07c4 | 295 | unmake_file(file); |
cb197514 WD |
296 | #ifdef SUPPORT_ACLS |
297 | uncache_tmp_acls(); | |
298 | #endif | |
299 | #ifdef SUPPORT_XATTRS | |
300 | uncache_tmp_xattrs(); | |
301 | #endif | |
21cddef2 | 302 | return 2; |
47d6a60c | 303 | } |
66203a98 | 304 | |
21cddef2 WD |
305 | /* Copy to backup tree if a file. */ |
306 | if (!ret) { | |
3696674b | 307 | if (copy_file(fname, buf, -1, file->mode) < 0) { |
d62bcc17 | 308 | rsyserr(FERROR, errno, "keep_backup failed: %s -> \"%s\"", |
45c49b52 | 309 | full_fname(fname), buf); |
21cddef2 | 310 | unmake_file(file); |
cb197514 WD |
311 | #ifdef SUPPORT_ACLS |
312 | uncache_tmp_acls(); | |
313 | #endif | |
314 | #ifdef SUPPORT_XATTRS | |
315 | uncache_tmp_xattrs(); | |
316 | #endif | |
21cddef2 | 317 | return 0; |
47d6a60c | 318 | } |
3696674b WD |
319 | if (DEBUG_GTE(BACKUP, 1)) |
320 | rprintf(FINFO, "make_backup: COPY %s successful.\n", fname); | |
21cddef2 | 321 | ret = 2; |
47d6a60c | 322 | } |
21cddef2 WD |
323 | |
324 | save_preserve_xattrs = preserve_xattrs; | |
e9489cd6 | 325 | preserve_xattrs = 0; |
16edf865 | 326 | set_file_attrs(buf, file, NULL, fname, 0); |
e9489cd6 | 327 | preserve_xattrs = save_preserve_xattrs; |
21cddef2 | 328 | |
82ad07c4 | 329 | unmake_file(file); |
cb197514 WD |
330 | #ifdef SUPPORT_ACLS |
331 | uncache_tmp_acls(); | |
332 | #endif | |
333 | #ifdef SUPPORT_XATTRS | |
334 | uncache_tmp_xattrs(); | |
335 | #endif | |
378a074c | 336 | |
21cddef2 | 337 | success: |
3696674b WD |
338 | if (INFO_GTE(BACKUP, 1)) |
339 | rprintf(FINFO, "backed up %s to %s\n", fname, buf); | |
21cddef2 | 340 | return ret; |
66203a98 | 341 | } |